Abdessamad El Abbassi
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Diff: targets/cmsis/TARGET_STM/TARGET_DISCO_F051R8/stm32f0xx_usart.c
- Revision:
- 130:1dec54e4aec3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_DISCO_F051R8/stm32f0xx_usart.c Fri Mar 21 11:45:09 2014 +0000
@@ -0,0 +1,2106 @@
+/**
+ ******************************************************************************
+ * @file stm32f0xx_usart.c
+ * @author MCD Application Team
+ * @version V1.3.0
+ * @date 16-January-2014
+ * @brief This file provides firmware functions to manage the following
+ * functionalities of the Universal synchronous asynchronous receiver
+ * transmitter (USART):
+ * + Initialization and Configuration
+ * + STOP Mode
+ * + AutoBaudRate
+ * + Data transfers
+ * + Multi-Processor Communication
+ * + LIN mode
+ * + Half-duplex mode
+ * + Smartcard mode
+ * + IrDA mode
+ * + RS485 mode
+ * + DMA transfers management
+ * + Interrupts and flags management
+ *
+ * @verbatim
+ ===============================================================================
+ ##### How to use this driver #####
+ ===============================================================================
+ [..]
+ (#) Enable peripheral clock using RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE)
+ function for USART1 or using RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx, ENABLE)
+ function for USART2 and USART3.
+ (#) According to the USART mode, enable the GPIO clocks using
+ RCC_AHBPeriphClockCmd() function. (The I/O can be TX, RX, CTS,
+ or and SCLK).
+ (#) Peripheral's alternate function:
+ (++) Connect the pin to the desired peripherals' Alternate
+ Function (AF) using GPIO_PinAFConfig() function.
+ (++) Configure the desired pin in alternate function by:
+ GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF.
+ (++) Select the type, pull-up/pull-down and output speed via
+ GPIO_PuPd, GPIO_OType and GPIO_Speed members.
+ (++) Call GPIO_Init() function.
+ (#) Program the Baud Rate, Word Length , Stop Bit, Parity, Hardware
+ flow control and Mode(Receiver/Transmitter) using the SPI_Init()
+ function.
+ (#) For synchronous mode, enable the clock and program the polarity,
+ phase and last bit using the USART_ClockInit() function.
+ (#) Enable the NVIC and the corresponding interrupt using the function
+ USART_ITConfig() if you need to use interrupt mode.
+ (#) When using the DMA mode:
+ (++) Configure the DMA using DMA_Init() function.
+ (++) Active the needed channel Request using USART_DMACmd() function.
+ (#) Enable the USART using the USART_Cmd() function.
+ (#) Enable the DMA using the DMA_Cmd() function, when using DMA mode.
+ [..]
+ Refer to Multi-Processor, LIN, half-duplex, Smartcard, IrDA sub-sections
+ for more details.
+
+@endverbatim
+
+ ******************************************************************************
+ * @attention
+ *
+ * <h2><center>© COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ ******************************************************************************
+ */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f0xx_usart.h"
+#include "stm32f0xx_rcc.h"
+
+/** @addtogroup STM32F0xx_StdPeriph_Driver
+ * @{
+ */
+
+/** @defgroup USART
+ * @brief USART driver modules
+ * @{
+ */
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+
+/*!< USART CR1 register clear Mask ((~(uint32_t)0xFFFFE6F3)) */
+#define CR1_CLEAR_MASK ((uint32_t)(USART_CR1_M | USART_CR1_PCE | \
+ USART_CR1_PS | USART_CR1_TE | \
+ USART_CR1_RE))
+
+/*!< USART CR2 register clock bits clear Mask ((~(uint32_t)0xFFFFF0FF)) */
+#define CR2_CLOCK_CLEAR_MASK ((uint32_t)(USART_CR2_CLKEN | USART_CR2_CPOL | \
+ USART_CR2_CPHA | USART_CR2_LBCL))
+
+/*!< USART CR3 register clear Mask ((~(uint32_t)0xFFFFFCFF)) */
+#define CR3_CLEAR_MASK ((uint32_t)(USART_CR3_RTSE | USART_CR3_CTSE))
+
+/*!< USART Interrupts mask */
+#define IT_MASK ((uint32_t)0x000000FF)
+
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Private functions ---------------------------------------------------------*/
+
+/** @defgroup USART_Private_Functions
+ * @{
+ */
+
+/** @defgroup USART_Group1 Initialization and Configuration functions
+ * @brief Initialization and Configuration functions
+ *
+@verbatim
+ ===============================================================================
+ ##### Initialization and Configuration functions #####
+ ===============================================================================
+ [..]
+ This subsection provides a set of functions allowing to initialize the USART
+ in asynchronous and in synchronous modes.
+ (+) For the asynchronous mode only these parameters can be configured:
+ (++) Baud Rate.
+ (++) Word Length.
+ (++) Stop Bit.
+ (++) Parity: If the parity is enabled, then the MSB bit of the data written
+ in the data register is transmitted but is changed by the parity bit.
+ Depending on the frame length defined by the M bit (8-bits or 9-bits),
+ the possible USART frame formats are as listed in the following table:
+
+ +-------------------------------------------------------------+
+ | M bit | PCE bit | USART frame |
+ |---------------------|---------------------------------------|
+ | 0 | 0 | | SB | 8 bit data | STB | |
+ |---------|-----------|---------------------------------------|
+ | 0 | 1 | | SB | 7 bit data | PB | STB | |
+ |---------|-----------|---------------------------------------|
+ | 1 | 0 | | SB | 9 bit data | STB | |
+ |---------|-----------|---------------------------------------|
+ | 1 | 1 | | SB | 8 bit data | PB | STB | |
+ +-------------------------------------------------------------+
+
+ (++) Hardware flow control.
+ (++) Receiver/transmitter modes.
+ [..] The USART_Init() function follows the USART asynchronous configuration
+ procedure(details for the procedure are available in reference manual.
+ (+) For the synchronous mode in addition to the asynchronous mode parameters
+ these parameters should be also configured:
+ (++) USART Clock Enabled.
+ (++) USART polarity.
+ (++) USART phase.
+ (++) USART LastBit.
+ [..] These parameters can be configured using the USART_ClockInit() function.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Deinitializes the USARTx peripheral registers to their default reset values.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @retval None
+ */
+void USART_DeInit(USART_TypeDef* USARTx)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+
+ if (USARTx == USART1)
+ {
+ RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
+ RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
+ }
+ else if (USARTx == USART2)
+ {
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
+ }
+ else if (USARTx == USART3)
+ {
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE);
+ }
+ else
+ {
+ if (USARTx == USART4)
+ {
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART4, ENABLE);
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART4, DISABLE);
+ }
+ }
+}
+
+/**
+ * @brief Initializes the USARTx peripheral according to the specified
+ * parameters in the USART_InitStruct .
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_InitStruct: pointer to a USART_InitTypeDef structure that contains
+ * the configuration information for the specified USART peripheral.
+ * @retval None
+ */
+void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct)
+{
+ uint32_t divider = 0, apbclock = 0, tmpreg = 0;
+ RCC_ClocksTypeDef RCC_ClocksStatus;
+
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_BAUDRATE(USART_InitStruct->USART_BaudRate));
+ assert_param(IS_USART_WORD_LENGTH(USART_InitStruct->USART_WordLength));
+ assert_param(IS_USART_STOPBITS(USART_InitStruct->USART_StopBits));
+ assert_param(IS_USART_PARITY(USART_InitStruct->USART_Parity));
+ assert_param(IS_USART_MODE(USART_InitStruct->USART_Mode));
+ assert_param(IS_USART_HARDWARE_FLOW_CONTROL(USART_InitStruct->USART_HardwareFlowControl));
+
+ /* Disable USART */
+ USARTx->CR1 &= (uint32_t)~((uint32_t)USART_CR1_UE);
+
+ /*---------------------------- USART CR2 Configuration -----------------------*/
+ tmpreg = USARTx->CR2;
+ /* Clear STOP[13:12] bits */
+ tmpreg &= (uint32_t)~((uint32_t)USART_CR2_STOP);
+
+ /* Configure the USART Stop Bits, Clock, CPOL, CPHA and LastBit ------------*/
+ /* Set STOP[13:12] bits according to USART_StopBits value */
+ tmpreg |= (uint32_t)USART_InitStruct->USART_StopBits;
+
+ /* Write to USART CR2 */
+ USARTx->CR2 = tmpreg;
+
+ /*---------------------------- USART CR1 Configuration -----------------------*/
+ tmpreg = USARTx->CR1;
+ /* Clear M, PCE, PS, TE and RE bits */
+ tmpreg &= (uint32_t)~((uint32_t)CR1_CLEAR_MASK);
+
+ /* Configure the USART Word Length, Parity and mode ----------------------- */
+ /* Set the M bits according to USART_WordLength value */
+ /* Set PCE and PS bits according to USART_Parity value */
+ /* Set TE and RE bits according to USART_Mode value */
+ tmpreg |= (uint32_t)USART_InitStruct->USART_WordLength | USART_InitStruct->USART_Parity |
+ USART_InitStruct->USART_Mode;
+
+ /* Write to USART CR1 */
+ USARTx->CR1 = tmpreg;
+
+ /*---------------------------- USART CR3 Configuration -----------------------*/
+ tmpreg = USARTx->CR3;
+ /* Clear CTSE and RTSE bits */
+ tmpreg &= (uint32_t)~((uint32_t)CR3_CLEAR_MASK);
+
+ /* Configure the USART HFC -------------------------------------------------*/
+ /* Set CTSE and RTSE bits according to USART_HardwareFlowControl value */
+ tmpreg |= USART_InitStruct->USART_HardwareFlowControl;
+
+ /* Write to USART CR3 */
+ USARTx->CR3 = tmpreg;
+
+ /*---------------------------- USART BRR Configuration -----------------------*/
+ /* Configure the USART Baud Rate -------------------------------------------*/
+ RCC_GetClocksFreq(&RCC_ClocksStatus);
+
+ if (USARTx == USART1)
+ {
+ apbclock = RCC_ClocksStatus.USART1CLK_Frequency;
+ }
+ else if (USARTx == USART2)
+ {
+ apbclock = RCC_ClocksStatus.USART2CLK_Frequency;
+ }
+ else
+ {
+ apbclock = RCC_ClocksStatus.PCLK_Frequency;
+ }
+
+ /* Determine the integer part */
+ if ((USARTx->CR1 & USART_CR1_OVER8) != 0)
+ {
+ /* (divider * 10) computing in case Oversampling mode is 8 Samples */
+ divider = (uint32_t)((2 * apbclock) / (USART_InitStruct->USART_BaudRate));
+ tmpreg = (uint32_t)((2 * apbclock) % (USART_InitStruct->USART_BaudRate));
+ }
+ else /* if ((USARTx->CR1 & CR1_OVER8_Set) == 0) */
+ {
+ /* (divider * 10) computing in case Oversampling mode is 16 Samples */
+ divider = (uint32_t)((apbclock) / (USART_InitStruct->USART_BaudRate));
+ tmpreg = (uint32_t)((apbclock) % (USART_InitStruct->USART_BaudRate));
+ }
+
+ /* round the divider : if fractional part i greater than 0.5 increment divider */
+ if (tmpreg >= (USART_InitStruct->USART_BaudRate) / 2)
+ {
+ divider++;
+ }
+
+ /* Implement the divider in case Oversampling mode is 8 Samples */
+ if ((USARTx->CR1 & USART_CR1_OVER8) != 0)
+ {
+ /* get the LSB of divider and shift it to the right by 1 bit */
+ tmpreg = (divider & (uint16_t)0x000F) >> 1;
+
+ /* update the divider value */
+ divider = (divider & (uint16_t)0xFFF0) | tmpreg;
+ }
+
+ /* Write to USART BRR */
+ USARTx->BRR = (uint16_t)divider;
+}
+
+/**
+ * @brief Fills each USART_InitStruct member with its default value.
+ * @param USART_InitStruct: pointer to a USART_InitTypeDef structure
+ * which will be initialized.
+ * @retval None
+ */
+void USART_StructInit(USART_InitTypeDef* USART_InitStruct)
+{
+ /* USART_InitStruct members default value */
+ USART_InitStruct->USART_BaudRate = 9600;
+ USART_InitStruct->USART_WordLength = USART_WordLength_8b;
+ USART_InitStruct->USART_StopBits = USART_StopBits_1;
+ USART_InitStruct->USART_Parity = USART_Parity_No ;
+ USART_InitStruct->USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
+ USART_InitStruct->USART_HardwareFlowControl = USART_HardwareFlowControl_None;
+}
+
+/**
+ * @brief Initializes the USARTx peripheral Clock according to the
+ * specified parameters in the USART_ClockInitStruct.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef
+ * structure that contains the configuration information for the specified
+ * USART peripheral.
+ * @retval None
+ */
+void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct)
+{
+ uint32_t tmpreg = 0;
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_CLOCK(USART_ClockInitStruct->USART_Clock));
+ assert_param(IS_USART_CPOL(USART_ClockInitStruct->USART_CPOL));
+ assert_param(IS_USART_CPHA(USART_ClockInitStruct->USART_CPHA));
+ assert_param(IS_USART_LASTBIT(USART_ClockInitStruct->USART_LastBit));
+/*---------------------------- USART CR2 Configuration -----------------------*/
+ tmpreg = USARTx->CR2;
+ /* Clear CLKEN, CPOL, CPHA, LBCL and SSM bits */
+ tmpreg &= (uint32_t)~((uint32_t)CR2_CLOCK_CLEAR_MASK);
+ /* Configure the USART Clock, CPOL, CPHA, LastBit and SSM ------------*/
+ /* Set CLKEN bit according to USART_Clock value */
+ /* Set CPOL bit according to USART_CPOL value */
+ /* Set CPHA bit according to USART_CPHA value */
+ /* Set LBCL bit according to USART_LastBit value */
+ tmpreg |= (uint32_t)(USART_ClockInitStruct->USART_Clock | USART_ClockInitStruct->USART_CPOL |
+ USART_ClockInitStruct->USART_CPHA | USART_ClockInitStruct->USART_LastBit);
+ /* Write to USART CR2 */
+ USARTx->CR2 = tmpreg;
+}
+
+/**
+ * @brief Fills each USART_ClockInitStruct member with its default value.
+ * @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef
+ * structure which will be initialized.
+ * @retval None
+ */
+void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct)
+{
+ /* USART_ClockInitStruct members default value */
+ USART_ClockInitStruct->USART_Clock = USART_Clock_Disable;
+ USART_ClockInitStruct->USART_CPOL = USART_CPOL_Low;
+ USART_ClockInitStruct->USART_CPHA = USART_CPHA_1Edge;
+ USART_ClockInitStruct->USART_LastBit = USART_LastBit_Disable;
+}
+
+/**
+ * @brief Enables or disables the specified USART peripheral.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param NewState: new state of the USARTx peripheral.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the selected USART by setting the UE bit in the CR1 register */
+ USARTx->CR1 |= USART_CR1_UE;
+ }
+ else
+ {
+ /* Disable the selected USART by clearing the UE bit in the CR1 register */
+ USARTx->CR1 &= (uint32_t)~((uint32_t)USART_CR1_UE);
+ }
+}
+
+/**
+ * @brief Enables or disables the USART's transmitter or receiver.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_Direction: specifies the USART direction.
+ * This parameter can be any combination of the following values:
+ * @arg USART_Mode_Tx: USART Transmitter
+ * @arg USART_Mode_Rx: USART Receiver
+ * @param NewState: new state of the USART transfer direction.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_DirectionModeCmd(USART_TypeDef* USARTx, uint32_t USART_DirectionMode, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_MODE(USART_DirectionMode));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the USART's transfer interface by setting the TE and/or RE bits
+ in the USART CR1 register */
+ USARTx->CR1 |= USART_DirectionMode;
+ }
+ else
+ {
+ /* Disable the USART's transfer interface by clearing the TE and/or RE bits
+ in the USART CR3 register */
+ USARTx->CR1 &= (uint32_t)~USART_DirectionMode;
+ }
+}
+
+/**
+ * @brief Enables or disables the USART's 8x oversampling mode.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param NewState: new state of the USART 8x oversampling mode.
+ * This parameter can be: ENABLE or DISABLE.
+ * @note This function has to be called before calling USART_Init() function
+ * in order to have correct baudrate Divider value.
+ * @retval None
+ */
+void USART_OverSampling8Cmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the 8x Oversampling mode by setting the OVER8 bit in the CR1 register */
+ USARTx->CR1 |= USART_CR1_OVER8;
+ }
+ else
+ {
+ /* Disable the 8x Oversampling mode by clearing the OVER8 bit in the CR1 register */
+ USARTx->CR1 &= (uint32_t)~((uint32_t)USART_CR1_OVER8);
+ }
+}
+
+/**
+ * @brief Enables or disables the USART's one bit sampling method.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param NewState: new state of the USART one bit sampling method.
+ * This parameter can be: ENABLE or DISABLE.
+ * @note This function has to be called before calling USART_Cmd() function.
+ * @retval None
+ */
+void USART_OneBitMethodCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the one bit method by setting the ONEBITE bit in the CR3 register */
+ USARTx->CR3 |= USART_CR3_ONEBIT;
+ }
+ else
+ {
+ /* Disable the one bit method by clearing the ONEBITE bit in the CR3 register */
+ USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_ONEBIT);
+ }
+}
+
+/**
+ * @brief Enables or disables the USART's most significant bit first
+ * transmitted/received following the start bit.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param NewState: new state of the USART most significant bit first
+ * transmitted/received following the start bit.
+ * This parameter can be: ENABLE or DISABLE.
+ * @note This function has to be called before calling USART_Cmd() function.
+ * @retval None
+ */
+void USART_MSBFirstCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the most significant bit first transmitted/received following the
+ start bit by setting the MSBFIRST bit in the CR2 register */
+ USARTx->CR2 |= USART_CR2_MSBFIRST;
+ }
+ else
+ {
+ /* Disable the most significant bit first transmitted/received following the
+ start bit by clearing the MSBFIRST bit in the CR2 register */
+ USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_MSBFIRST);
+ }
+}
+
+/**
+ * @brief Enables or disables the binary data inversion.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param NewState: new defined levels for the USART data.
+ * This parameter can be:
+ * @arg ENABLE: Logical data from the data register are send/received in negative
+ * logic (1=L, 0=H). The parity bit is also inverted.
+ * @arg DISABLE: Logical data from the data register are send/received in positive
+ * logic (1=H, 0=L)
+ * @note This function has to be called before calling USART_Cmd() function.
+ * @retval None
+ */
+void USART_DataInvCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the binary data inversion feature by setting the DATAINV bit in
+ the CR2 register */
+ USARTx->CR2 |= USART_CR2_DATAINV;
+ }
+ else
+ {
+ /* Disable the binary data inversion feature by clearing the DATAINV bit in
+ the CR2 register */
+ USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_DATAINV);
+ }
+}
+
+/**
+ * @brief Enables or disables the Pin(s) active level inversion.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_InvPin: specifies the USART pin(s) to invert.
+ * This parameter can be any combination of the following values:
+ * @arg USART_InvPin_Tx: USART Tx pin active level inversion.
+ * @arg USART_InvPin_Rx: USART Rx pin active level inversion.
+ * @param NewState: new active level status for the USART pin(s).
+ * This parameter can be:
+ * @arg ENABLE: pin(s) signal values are inverted (Vdd =0, Gnd =1).
+ * @arg DISABLE: pin(s) signal works using the standard logic levels (Vdd =1, Gnd =0).
+ * @note This function has to be called before calling USART_Cmd() function.
+ * @retval None
+ */
+void USART_InvPinCmd(USART_TypeDef* USARTx, uint32_t USART_InvPin, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_INVERSTION_PIN(USART_InvPin));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the active level inversion for selected pins by setting the TXINV
+ and/or RXINV bits in the USART CR2 register */
+ USARTx->CR2 |= USART_InvPin;
+ }
+ else
+ {
+ /* Disable the active level inversion for selected requests by clearing the
+ TXINV and/or RXINV bits in the USART CR2 register */
+ USARTx->CR2 &= (uint32_t)~USART_InvPin;
+ }
+}
+
+/**
+ * @brief Enables or disables the swap Tx/Rx pins.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param NewState: new state of the USARTx TX/RX pins pinout.
+ * This parameter can be:
+ * @arg ENABLE: The TX and RX pins functions are swapped.
+ * @arg DISABLE: TX/RX pins are used as defined in standard pinout
+ * @note This function has to be called before calling USART_Cmd() function.
+ * @retval None
+ */
+void USART_SWAPPinCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the SWAP feature by setting the SWAP bit in the CR2 register */
+ USARTx->CR2 |= USART_CR2_SWAP;
+ }
+ else
+ {
+ /* Disable the SWAP feature by clearing the SWAP bit in the CR2 register */
+ USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_SWAP);
+ }
+}
+
+/**
+ * @brief Enables or disables the receiver Time Out feature.
+ * @param USARTx: where x can be 1 to select the USART peripheral.
+ * @param NewState: new state of the USARTx receiver Time Out.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_ReceiverTimeOutCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the receiver time out feature by setting the RTOEN bit in the CR2
+ register */
+ USARTx->CR2 |= USART_CR2_RTOEN;
+ }
+ else
+ {
+ /* Disable the receiver time out feature by clearing the RTOEN bit in the CR2
+ register */
+ USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_RTOEN);
+ }
+}
+
+/**
+ * @brief Sets the receiver Time Out value.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is available only for STM32F072 devices.
+ * @param USART_ReceiverTimeOut: specifies the Receiver Time Out value.
+ * @retval None
+ */
+void USART_SetReceiverTimeOut(USART_TypeDef* USARTx, uint32_t USART_ReceiverTimeOut)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+ assert_param(IS_USART_TIMEOUT(USART_ReceiverTimeOut));
+
+ /* Clear the receiver Time Out value by clearing the RTO[23:0] bits in the RTOR
+ register */
+ USARTx->RTOR &= (uint32_t)~((uint32_t)USART_RTOR_RTO);
+ /* Set the receiver Time Out value by setting the RTO[23:0] bits in the RTOR
+ register */
+ USARTx->RTOR |= USART_ReceiverTimeOut;
+}
+
+/**
+ * @brief Sets the system clock prescaler.
+ * @note This function is not available for STM32F030 devices.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is available only for STM32F072 devices.
+ * @param USART_Prescaler: specifies the prescaler clock.
+ * @note This function has to be called before calling USART_Cmd() function.
+ * @retval None
+ */
+void USART_SetPrescaler(USART_TypeDef* USARTx, uint8_t USART_Prescaler)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+
+ /* Clear the USART prescaler */
+ USARTx->GTPR &= USART_GTPR_GT;
+ /* Set the USART prescaler */
+ USARTx->GTPR |= USART_Prescaler;
+}
+
+/**
+ * @}
+ */
+
+
+/** @defgroup USART_Group2 STOP Mode functions
+ * @brief STOP Mode functions
+ *
+@verbatim
+ ===============================================================================
+ ##### STOP Mode functions #####
+ ===============================================================================
+ [..] This subsection provides a set of functions allowing to manage
+ WakeUp from STOP mode.
+
+ [..] The USART is able to WakeUp from Stop Mode if USART clock is set to HSI
+ or LSI.
+
+ [..] The WakeUp source is configured by calling USART_StopModeWakeUpSourceConfig()
+ function.
+
+ [..] After configuring the source of WakeUp and before entering in Stop Mode
+ USART_STOPModeCmd() function should be called to allow USART WakeUp.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Enables or disables the specified USART peripheral in STOP Mode.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is available only for STM32F072 devices.
+ * @param NewState: new state of the USARTx peripheral state in stop mode.
+ * This parameter can be: ENABLE or DISABLE.
+ * @note This function has to be called when USART clock is set to HSI or LSE.
+ * @retval None
+ */
+void USART_STOPModeCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the selected USART in STOP mode by setting the UESM bit in the CR1
+ register */
+ USARTx->CR1 |= USART_CR1_UESM;
+ }
+ else
+ {
+ /* Disable the selected USART in STOP mode by clearing the UE bit in the CR1
+ register */
+ USARTx->CR1 &= (uint32_t)~((uint32_t)USART_CR1_UESM);
+ }
+}
+
+/**
+ * @brief Selects the USART WakeUp method form stop mode.
+ * @note This function is not available for STM32F030 devices.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is available only for STM32F072 devices.
+ * @param USART_WakeUp: specifies the selected USART wakeup method.
+ * This parameter can be one of the following values:
+ * @arg USART_WakeUpSource_AddressMatch: WUF active on address match.
+ * @arg USART_WakeUpSource_StartBit: WUF active on Start bit detection.
+ * @arg USART_WakeUpSource_RXNE: WUF active on RXNE.
+ * @note This function has to be called before calling USART_Cmd() function.
+ * @retval None
+ */
+void USART_StopModeWakeUpSourceConfig(USART_TypeDef* USARTx, uint32_t USART_WakeUpSource)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+ assert_param(IS_USART_STOPMODE_WAKEUPSOURCE(USART_WakeUpSource));
+
+ USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_WUS);
+ USARTx->CR3 |= USART_WakeUpSource;
+}
+
+/**
+ * @}
+ */
+
+
+/** @defgroup USART_Group3 AutoBaudRate functions
+ * @brief AutoBaudRate functions
+ *
+@verbatim
+ ===============================================================================
+ ##### AutoBaudRate functions #####
+ ===============================================================================
+ [..] This subsection provides a set of functions allowing to manage
+ the AutoBaudRate detections.
+
+ [..] Before Enabling AutoBaudRate detection using USART_AutoBaudRateCmd ()
+ The character patterns used to calculate baudrate must be chosen by calling
+ USART_AutoBaudRateConfig() function. These function take as parameter :
+ (#)USART_AutoBaudRate_StartBit : any character starting with a bit 1.
+ (#)USART_AutoBaudRate_FallingEdge : any character starting with a 10xx bit pattern.
+
+ [..] At any later time, another request for AutoBaudRate detection can be performed
+ using USART_RequestCmd() function.
+
+ [..] The AutoBaudRate detection is monitored by the status of ABRF flag which indicate
+ that the AutoBaudRate detection is completed. In addition to ABRF flag, the ABRE flag
+ indicate that this procedure is completed without success. USART_GetFlagStatus ()
+ function should be used to monitor the status of these flags.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Enables or disables the Auto Baud Rate.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is available only for STM32F072 devices.
+ * @param NewState: new state of the USARTx auto baud rate.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_AutoBaudRateCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the auto baud rate feature by setting the ABREN bit in the CR2
+ register */
+ USARTx->CR2 |= USART_CR2_ABREN;
+ }
+ else
+ {
+ /* Disable the auto baud rate feature by clearing the ABREN bit in the CR2
+ register */
+ USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_ABREN);
+ }
+}
+
+/**
+ * @brief Selects the USART auto baud rate method.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is available only for STM32F072 devices.
+ * @param USART_AutoBaudRate: specifies the selected USART auto baud rate method.
+ * This parameter can be one of the following values:
+ * @arg USART_AutoBaudRate_StartBit: Start Bit duration measurement.
+ * @arg USART_AutoBaudRate_FallingEdge: Falling edge to falling edge measurement.
+ * @note This function has to be called before calling USART_Cmd() function.
+ * @retval None
+ */
+void USART_AutoBaudRateConfig(USART_TypeDef* USARTx, uint32_t USART_AutoBaudRate)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+ assert_param(IS_USART_AUTOBAUDRATE_MODE(USART_AutoBaudRate));
+
+ USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_ABRMODE);
+ USARTx->CR2 |= USART_AutoBaudRate;
+}
+
+/**
+ * @}
+ */
+
+
+/** @defgroup USART_Group4 Data transfers functions
+ * @brief Data transfers functions
+ *
+@verbatim
+ ===============================================================================
+ ##### Data transfers functions #####
+ ===============================================================================
+ [..] This subsection provides a set of functions allowing to manage
+ the USART data transfers.
+ [..] During an USART reception, data shifts in least significant bit first
+ through the RX pin. When a transmission is taking place, a write instruction to
+ the USART_TDR register stores the data in the shift register.
+ [..] The read access of the USART_RDR register can be done using
+ the USART_ReceiveData() function and returns the RDR value.
+ Whereas a write access to the USART_TDR can be done using USART_SendData()
+ function and stores the written data into TDR.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Transmits single data through the USARTx peripheral.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param Data: the data to transmit.
+ * @retval None
+ */
+void USART_SendData(USART_TypeDef* USARTx, uint16_t Data)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_DATA(Data));
+
+ /* Transmit Data */
+ USARTx->TDR = (Data & (uint16_t)0x01FF);
+}
+
+/**
+ * @brief Returns the most recent received data by the USARTx peripheral.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @retval The received data.
+ */
+uint16_t USART_ReceiveData(USART_TypeDef* USARTx)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+
+ /* Receive Data */
+ return (uint16_t)(USARTx->RDR & (uint16_t)0x01FF);
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Group5 MultiProcessor Communication functions
+ * @brief Multi-Processor Communication functions
+ *
+@verbatim
+ ===============================================================================
+ ##### Multi-Processor Communication functions #####
+ ===============================================================================
+ [..] This subsection provides a set of functions allowing to manage the USART
+ multiprocessor communication.
+ [..] For instance one of the USARTs can be the master, its TX output is
+ connected to the RX input of the other USART. The others are slaves,
+ their respective TX outputs are logically ANDed together and connected
+ to the RX input of the master. USART multiprocessor communication is
+ possible through the following procedure:
+ (#) Program the Baud rate, Word length = 9 bits, Stop bits, Parity,
+ Mode transmitter or Mode receiver and hardware flow control values
+ using the USART_Init() function.
+ (#) Configures the USART address using the USART_SetAddress() function.
+ (#) Configures the wake up methode (USART_WakeUp_IdleLine or
+ USART_WakeUp_AddressMark) using USART_WakeUpConfig() function only
+ for the slaves.
+ (#) Enable the USART using the USART_Cmd() function.
+ (#) Enter the USART slaves in mute mode using USART_ReceiverWakeUpCmd()
+ function.
+ [..] The USART Slave exit from mute mode when receive the wake up condition.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Sets the address of the USART node.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_Address: Indicates the address of the USART node.
+ * @retval None
+ */
+void USART_SetAddress(USART_TypeDef* USARTx, uint8_t USART_Address)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+
+ /* Clear the USART address */
+ USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_ADD);
+ /* Set the USART address node */
+ USARTx->CR2 |=((uint32_t)USART_Address << (uint32_t)0x18);
+}
+
+/**
+ * @brief Enables or disables the USART's mute mode.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param NewState: new state of the USART mute mode.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_MuteModeCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the USART mute mode by setting the MME bit in the CR1 register */
+ USARTx->CR1 |= USART_CR1_MME;
+ }
+ else
+ {
+ /* Disable the USART mute mode by clearing the MME bit in the CR1 register */
+ USARTx->CR1 &= (uint32_t)~((uint32_t)USART_CR1_MME);
+ }
+}
+
+/**
+ * @brief Selects the USART WakeUp method from mute mode.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_WakeUp: specifies the USART wakeup method.
+ * This parameter can be one of the following values:
+ * @arg USART_WakeUp_IdleLine: WakeUp by an idle line detection
+ * @arg USART_WakeUp_AddressMark: WakeUp by an address mark
+ * @retval None
+ */
+void USART_MuteModeWakeUpConfig(USART_TypeDef* USARTx, uint32_t USART_WakeUp)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_MUTEMODE_WAKEUP(USART_WakeUp));
+
+ USARTx->CR1 &= (uint32_t)~((uint32_t)USART_CR1_WAKE);
+ USARTx->CR1 |= USART_WakeUp;
+}
+
+/**
+ * @brief Configure the the USART Address detection length.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_AddressLength: specifies the USART address length detection.
+ * This parameter can be one of the following values:
+ * @arg USART_AddressLength_4b: 4-bit address length detection
+ * @arg USART_AddressLength_7b: 7-bit address length detection
+ * @retval None
+ */
+void USART_AddressDetectionConfig(USART_TypeDef* USARTx, uint32_t USART_AddressLength)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_ADDRESS_DETECTION(USART_AddressLength));
+
+ USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_ADDM7);
+ USARTx->CR2 |= USART_AddressLength;
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Group6 LIN mode functions
+ * @brief LIN mode functions
+ *
+@verbatim
+ ===============================================================================
+ ##### LIN mode functions #####
+ ===============================================================================
+ [..] This subsection provides a set of functions allowing to manage the USART
+ LIN Mode communication.
+ [..] In LIN mode, 8-bit data format with 1 stop bit is required in accordance
+ with the LIN standard.
+ [..] Only this LIN Feature is supported by the USART IP:
+ (+) LIN Master Synchronous Break send capability and LIN slave break
+ detection capability : 13-bit break generation and 10/11 bit break
+ detection.
+ [..] USART LIN Master transmitter communication is possible through the
+ following procedure:
+ (#) Program the Baud rate, Word length = 8bits, Stop bits = 1bit, Parity,
+ Mode transmitter or Mode receiver and hardware flow control values
+ using the USART_Init() function.
+ (#) Enable the LIN mode using the USART_LINCmd() function.
+ (#) Enable the USART using the USART_Cmd() function.
+ (#) Send the break character using USART_SendBreak() function.
+ [..] USART LIN Master receiver communication is possible through the
+ following procedure:
+ (#) Program the Baud rate, Word length = 8bits, Stop bits = 1bit, Parity,
+ Mode transmitter or Mode receiver and hardware flow control values
+ using the USART_Init() function.
+ (#) Configures the break detection length
+ using the USART_LINBreakDetectLengthConfig() function.
+ (#) Enable the LIN mode using the USART_LINCmd() function.
+ -@- In LIN mode, the following bits must be kept cleared:
+ (+@) CLKEN in the USART_CR2 register.
+ (+@) STOP[1:0], SCEN, HDSEL and IREN in the USART_CR3 register.
+ (#) Enable the USART using the USART_Cmd() function.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Sets the USART LIN Break detection length.
+ * @note This function is not available for STM32F030 devices.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is available only for STM32F072 devices.
+ * @param USART_LINBreakDetectLength: specifies the LIN break detection length.
+ * This parameter can be one of the following values:
+ * @arg USART_LINBreakDetectLength_10b: 10-bit break detection
+ * @arg USART_LINBreakDetectLength_11b: 11-bit break detection
+ * @retval None
+ */
+void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, uint32_t USART_LINBreakDetectLength)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+ assert_param(IS_USART_LIN_BREAK_DETECT_LENGTH(USART_LINBreakDetectLength));
+
+ USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_LBDL);
+ USARTx->CR2 |= USART_LINBreakDetectLength;
+}
+
+/**
+ * @brief Enables or disables the USART's LIN mode.
+ * @note This function is not available for STM32F030 devices.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is available only for STM32F072 devices.
+ * @param NewState: new state of the USART LIN mode.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the LIN mode by setting the LINEN bit in the CR2 register */
+ USARTx->CR2 |= USART_CR2_LINEN;
+ }
+ else
+ {
+ /* Disable the LIN mode by clearing the LINEN bit in the CR2 register */
+ USARTx->CR2 &= (uint32_t)~((uint32_t)USART_CR2_LINEN);
+ }
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Group7 Halfduplex mode function
+ * @brief Half-duplex mode function
+ *
+@verbatim
+ ===============================================================================
+ ##### Half-duplex mode function #####
+ ===============================================================================
+ [..] This subsection provides a set of functions allowing to manage the USART
+ Half-duplex communication.
+ [..] The USART can be configured to follow a single-wire half-duplex protocol
+ where the TX and RX lines are internally connected.
+ [..] USART Half duplex communication is possible through the following procedure:
+ (#) Program the Baud rate, Word length, Stop bits, Parity, Mode transmitter
+ or Mode receiver and hardware flow control values using the USART_Init()
+ function.
+ (#) Configures the USART address using the USART_SetAddress() function.
+ (#) Enable the half duplex mode using USART_HalfDuplexCmd() function.
+ (#) Enable the USART using the USART_Cmd() function.
+ -@- The RX pin is no longer used.
+ -@- In Half-duplex mode the following bits must be kept cleared:
+ (+@) LINEN and CLKEN bits in the USART_CR2 register.
+ (+@) SCEN and IREN bits in the USART_CR3 register.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Enables or disables the USART's Half Duplex communication.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param NewState: new state of the USART Communication.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the Half-Duplex mode by setting the HDSEL bit in the CR3 register */
+ USARTx->CR3 |= USART_CR3_HDSEL;
+ }
+ else
+ {
+ /* Disable the Half-Duplex mode by clearing the HDSEL bit in the CR3 register */
+ USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_HDSEL);
+ }
+}
+
+/**
+ * @}
+ */
+
+
+/** @defgroup USART_Group8 Smartcard mode functions
+ * @brief Smartcard mode functions
+ *
+@verbatim
+ ===============================================================================
+ ##### Smartcard mode functions #####
+ ===============================================================================
+ [..] This subsection provides a set of functions allowing to manage the USART
+ Smartcard communication.
+ [..] The Smartcard interface is designed to support asynchronous protocol
+ Smartcards as defined in the ISO 7816-3 standard. The USART can provide
+ a clock to the smartcard through the SCLK output. In smartcard mode,
+ SCLK is not associated to the communication but is simply derived from
+ the internal peripheral input clock through a 5-bit prescaler.
+ [..] Smartcard communication is possible through the following procedure:
+ (#) Configures the Smartcard Prsecaler using the USART_SetPrescaler()
+ function.
+ (#) Configures the Smartcard Guard Time using the USART_SetGuardTime()
+ function.
+ (#) Program the USART clock using the USART_ClockInit() function as following:
+ (++) USART Clock enabled.
+ (++) USART CPOL Low.
+ (++) USART CPHA on first edge.
+ (++) USART Last Bit Clock Enabled.
+ (#) Program the Smartcard interface using the USART_Init() function as
+ following:
+ (++) Word Length = 9 Bits.
+ (++) 1.5 Stop Bit.
+ (++) Even parity.
+ (++) BaudRate = 12096 baud.
+ (++) Hardware flow control disabled (RTS and CTS signals).
+ (++) Tx and Rx enabled
+ (#) Optionally you can enable the parity error interrupt using
+ the USART_ITConfig() function.
+ (#) Enable the Smartcard NACK using the USART_SmartCardNACKCmd() function.
+ (#) Enable the Smartcard interface using the USART_SmartCardCmd() function.
+ (#) Enable the USART using the USART_Cmd() function.
+ [..]
+ Please refer to the ISO 7816-3 specification for more details.
+ [..]
+ (@) It is also possible to choose 0.5 stop bit for receiving but it is
+ recommended to use 1.5 stop bits for both transmitting and receiving
+ to avoid switching between the two configurations.
+ (@) In smartcard mode, the following bits must be kept cleared:
+ (+@) LINEN bit in the USART_CR2 register.
+ (+@) HDSEL and IREN bits in the USART_CR3 register.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Sets the specified USART guard time.
+ * @note This function is not available for STM32F030 devices.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is applicable only for STM32F072 devices.
+ * @param USART_GuardTime: specifies the guard time.
+ * @retval None
+ */
+void USART_SetGuardTime(USART_TypeDef* USARTx, uint8_t USART_GuardTime)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+
+ /* Clear the USART Guard time */
+ USARTx->GTPR &= USART_GTPR_PSC;
+ /* Set the USART guard time */
+ USARTx->GTPR |= (uint16_t)((uint16_t)USART_GuardTime << 0x08);
+}
+
+/**
+ * @brief Enables or disables the USART's Smart Card mode.
+ * @note This function is not available for STM32F030 devices.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is applicable only for STM32F072 devices.
+ * @param NewState: new state of the Smart Card mode.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Enable the SC mode by setting the SCEN bit in the CR3 register */
+ USARTx->CR3 |= USART_CR3_SCEN;
+ }
+ else
+ {
+ /* Disable the SC mode by clearing the SCEN bit in the CR3 register */
+ USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_SCEN);
+ }
+}
+
+/**
+ * @brief Enables or disables NACK transmission.
+ * @note This function is not available for STM32F030 devices.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is applicable only for STM32F072 devices.
+ * @param NewState: new state of the NACK transmission.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Enable the NACK transmission by setting the NACK bit in the CR3 register */
+ USARTx->CR3 |= USART_CR3_NACK;
+ }
+ else
+ {
+ /* Disable the NACK transmission by clearing the NACK bit in the CR3 register */
+ USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_NACK);
+ }
+}
+
+/**
+ * @brief Sets the Smart Card number of retries in transmit and receive.
+ * @note This function is not available for STM32F030 devices.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is applicable only for STM32F072 devices.
+ * @param USART_AutoCount: specifies the Smart Card auto retry count.
+ * @retval None
+ */
+void USART_SetAutoRetryCount(USART_TypeDef* USARTx, uint8_t USART_AutoCount)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+ assert_param(IS_USART_AUTO_RETRY_COUNTER(USART_AutoCount));
+ /* Clear the USART auto retry count */
+ USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_SCARCNT);
+ /* Set the USART auto retry count*/
+ USARTx->CR3 |= (uint32_t)((uint32_t)USART_AutoCount << 0x11);
+}
+
+/**
+ * @brief Sets the Smart Card Block length.
+ * @note This function is not available for STM32F030 devices.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is applicable only for STM32F072 devices.
+ * @param USART_BlockLength: specifies the Smart Card block length.
+ * @retval None
+ */
+void USART_SetBlockLength(USART_TypeDef* USARTx, uint8_t USART_BlockLength)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+
+ /* Clear the Smart card block length */
+ USARTx->RTOR &= (uint32_t)~((uint32_t)USART_RTOR_BLEN);
+ /* Set the Smart Card block length */
+ USARTx->RTOR |= (uint32_t)((uint32_t)USART_BlockLength << 0x18);
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Group9 IrDA mode functions
+ * @brief IrDA mode functions
+ *
+@verbatim
+ ===============================================================================
+ ##### IrDA mode functions #####
+ ===============================================================================
+ [..] This subsection provides a set of functions allowing to manage the USART
+ IrDA communication.
+ [..] IrDA is a half duplex communication protocol. If the Transmitter is busy,
+ any data on the IrDA receive line will be ignored by the IrDA decoder
+ and if the Receiver is busy, data on the TX from the USART to IrDA will
+ not be encoded by IrDA. While receiving data, transmission should be
+ avoided as the data to be transmitted could be corrupted.
+ [..] IrDA communication is possible through the following procedure:
+ (#) Program the Baud rate, Word length = 8 bits, Stop bits, Parity,
+ Transmitter/Receiver modes and hardware flow control values using
+ the USART_Init() function.
+ (#) Configures the IrDA pulse width by configuring the prescaler using
+ the USART_SetPrescaler() function.
+ (#) Configures the IrDA USART_IrDAMode_LowPower or USART_IrDAMode_Normal
+ mode using the USART_IrDAConfig() function.
+ (#) Enable the IrDA using the USART_IrDACmd() function.
+ (#) Enable the USART using the USART_Cmd() function.
+ [..]
+ (@) A pulse of width less than two and greater than one PSC period(s) may or
+ may not be rejected.
+ (@) The receiver set up time should be managed by software. The IrDA physical
+ layer specification specifies a minimum of 10 ms delay between
+ transmission and reception (IrDA is a half duplex protocol).
+ (@) In IrDA mode, the following bits must be kept cleared:
+ (+@) LINEN, STOP and CLKEN bits in the USART_CR2 register.
+ (+@) SCEN and HDSEL bits in the USART_CR3 register.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Configures the USART's IrDA interface.
+ * @note This function is not available for STM32F030 devices.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is applicable only for STM32F072 devices.
+ * @param USART_IrDAMode: specifies the IrDA mode.
+ * This parameter can be one of the following values:
+ * @arg USART_IrDAMode_LowPower
+ * @arg USART_IrDAMode_Normal
+ * @retval None
+ */
+void USART_IrDAConfig(USART_TypeDef* USARTx, uint32_t USART_IrDAMode)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+ assert_param(IS_USART_IRDA_MODE(USART_IrDAMode));
+
+ USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_IRLP);
+ USARTx->CR3 |= USART_IrDAMode;
+}
+
+/**
+ * @brief Enables or disables the USART's IrDA interface.
+ * @note This function is not available for STM32F030 devices.
+ * @param USARTx: where x can be 1or 2 to select the USART peripheral.
+ * @note USART2 is applicable only for STM32F072 devices.
+ * @param NewState: new state of the IrDA mode.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_12_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the IrDA mode by setting the IREN bit in the CR3 register */
+ USARTx->CR3 |= USART_CR3_IREN;
+ }
+ else
+ {
+ /* Disable the IrDA mode by clearing the IREN bit in the CR3 register */
+ USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_IREN);
+ }
+}
+/**
+ * @}
+ */
+
+/** @defgroup USART_Group10 RS485 mode function
+ * @brief RS485 mode function
+ *
+@verbatim
+ ===============================================================================
+ ##### RS485 mode functions #####
+ ===============================================================================
+ [..] This subsection provides a set of functions allowing to manage the USART
+ RS485 flow control.
+ [..] RS485 flow control (Driver enable feature) handling is possible through
+ the following procedure:
+ (#) Program the Baud rate, Word length = 8 bits, Stop bits, Parity,
+ Transmitter/Receiver modes and hardware flow control values using
+ the USART_Init() function.
+ (#) Enable the Driver Enable using the USART_DECmd() function.
+ (#) Configures the Driver Enable polarity using the USART_DEPolarityConfig()
+ function.
+ (#) Configures the Driver Enable assertion time using USART_SetDEAssertionTime()
+ function and deassertion time using the USART_SetDEDeassertionTime()
+ function.
+ (#) Enable the USART using the USART_Cmd() function.
+ -@-
+ (+@) The assertion and dessertion times are expressed in sample time units (1/8 or
+ 1/16 bit time, depending on the oversampling rate).
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Enables or disables the USART's DE functionality.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param NewState: new state of the driver enable mode.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_DECmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Enable the DE functionality by setting the DEM bit in the CR3 register */
+ USARTx->CR3 |= USART_CR3_DEM;
+ }
+ else
+ {
+ /* Disable the DE functionality by clearing the DEM bit in the CR3 register */
+ USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_DEM);
+ }
+}
+
+/**
+ * @brief Configures the USART's DE polarity
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_DEPolarity: specifies the DE polarity.
+ * This parameter can be one of the following values:
+ * @arg USART_DEPolarity_Low
+ * @arg USART_DEPolarity_High
+ * @retval None
+ */
+void USART_DEPolarityConfig(USART_TypeDef* USARTx, uint32_t USART_DEPolarity)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_DE_POLARITY(USART_DEPolarity));
+
+ USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_DEP);
+ USARTx->CR3 |= USART_DEPolarity;
+}
+
+/**
+ * @brief Sets the specified RS485 DE assertion time
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_DEAssertionTime: specifies the time between the activation of
+ * the DE signal and the beginning of the start bit
+ * @retval None
+ */
+void USART_SetDEAssertionTime(USART_TypeDef* USARTx, uint32_t USART_DEAssertionTime)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_DE_ASSERTION_DEASSERTION_TIME(USART_DEAssertionTime));
+
+ /* Clear the DE assertion time */
+ USARTx->CR1 &= (uint32_t)~((uint32_t)USART_CR1_DEAT);
+ /* Set the new value for the DE assertion time */
+ USARTx->CR1 |=((uint32_t)USART_DEAssertionTime << (uint32_t)0x15);
+}
+
+/**
+ * @brief Sets the specified RS485 DE deassertion time
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_DeassertionTime: specifies the time between the middle of the last
+ * stop bit in a transmitted message and the de-activation of the DE signal
+ * @retval None
+ */
+void USART_SetDEDeassertionTime(USART_TypeDef* USARTx, uint32_t USART_DEDeassertionTime)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_DE_ASSERTION_DEASSERTION_TIME(USART_DEDeassertionTime));
+
+ /* Clear the DE deassertion time */
+ USARTx->CR1 &= (uint32_t)~((uint32_t)USART_CR1_DEDT);
+ /* Set the new value for the DE deassertion time */
+ USARTx->CR1 |=((uint32_t)USART_DEDeassertionTime << (uint32_t)0x10);
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Group11 DMA transfers management functions
+ * @brief DMA transfers management functions
+ *
+@verbatim
+ ===============================================================================
+ ##### DMA transfers management functions #####
+ ===============================================================================
+ [..] This section provides two functions that can be used only in DMA mode.
+ [..] In DMA Mode, the USART communication can be managed by 2 DMA Channel
+ requests:
+ (#) USART_DMAReq_Tx: specifies the Tx buffer DMA transfer request.
+ (#) USART_DMAReq_Rx: specifies the Rx buffer DMA transfer request.
+ [..] In this Mode it is advised to use the following function:
+ (+) void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq,
+ FunctionalState NewState).
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Enables or disables the USART's DMA interface.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_DMAReq: specifies the DMA request.
+ * This parameter can be any combination of the following values:
+ * @arg USART_DMAReq_Tx: USART DMA transmit request
+ * @arg USART_DMAReq_Rx: USART DMA receive request
+ * @param NewState: new state of the DMA Request sources.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_DMACmd(USART_TypeDef* USARTx, uint32_t USART_DMAReq, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_DMAREQ(USART_DMAReq));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the DMA transfer for selected requests by setting the DMAT and/or
+ DMAR bits in the USART CR3 register */
+ USARTx->CR3 |= USART_DMAReq;
+ }
+ else
+ {
+ /* Disable the DMA transfer for selected requests by clearing the DMAT and/or
+ DMAR bits in the USART CR3 register */
+ USARTx->CR3 &= (uint32_t)~USART_DMAReq;
+ }
+}
+
+/**
+ * @brief Enables or disables the USART's DMA interface when reception error occurs.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_DMAOnError: specifies the DMA status in case of reception error.
+ * This parameter can be any combination of the following values:
+ * @arg USART_DMAOnError_Enable: DMA receive request enabled when the USART DMA
+ * reception error is asserted.
+ * @arg USART_DMAOnError_Disable: DMA receive request disabled when the USART DMA
+ * reception error is asserted.
+ * @retval None
+ */
+void USART_DMAReceptionErrorConfig(USART_TypeDef* USARTx, uint32_t USART_DMAOnError)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_DMAONERROR(USART_DMAOnError));
+
+ /* Clear the DMA Reception error detection bit */
+ USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_DDRE);
+ /* Set the new value for the DMA Reception error detection bit */
+ USARTx->CR3 |= USART_DMAOnError;
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Group12 Interrupts and flags management functions
+ * @brief Interrupts and flags management functions
+ *
+@verbatim
+ ===============================================================================
+ ##### Interrupts and flags management functions #####
+ ===============================================================================
+ [..] This subsection provides a set of functions allowing to configure the
+ USART Interrupts sources, Requests and check or clear the flags or pending bits status.
+ The user should identify which mode will be used in his application to
+ manage the communication: Polling mode, Interrupt mode.
+
+ *** Polling Mode ***
+ ====================
+ [..] In Polling Mode, the SPI communication can be managed by these flags:
+ (#) USART_FLAG_REACK: to indicate the status of the Receive Enable
+ acknowledge flag
+ (#) USART_FLAG_TEACK: to indicate the status of the Transmit Enable
+ acknowledge flag.
+ (#) USART_FLAG_WU: to indicate the status of the Wake up flag.
+ (#) USART_FLAG_RWU: to indicate the status of the Receive Wake up flag.
+ (#) USART_FLAG_SBK: to indicate the status of the Send Break flag.
+ (#) USART_FLAG_CM: to indicate the status of the Character match flag.
+ (#) USART_FLAG_BUSY: to indicate the status of the Busy flag.
+ (#) USART_FLAG_ABRF: to indicate the status of the Auto baud rate flag.
+ (#) USART_FLAG_ABRE: to indicate the status of the Auto baud rate error flag.
+ (#) USART_FLAG_EOB: to indicate the status of the End of block flag.
+ (#) USART_FLAG_RTO: to indicate the status of the Receive time out flag.
+ (#) USART_FLAG_nCTSS: to indicate the status of the Inverted nCTS input
+ bit status.
+ (#) USART_FLAG_TXE: to indicate the status of the transmit buffer register.
+ (#) USART_FLAG_RXNE: to indicate the status of the receive buffer register.
+ (#) USART_FLAG_TC: to indicate the status of the transmit operation.
+ (#) USART_FLAG_IDLE: to indicate the status of the Idle Line.
+ (#) USART_FLAG_CTS: to indicate the status of the nCTS input.
+ (#) USART_FLAG_LBD: to indicate the status of the LIN break detection.
+ (#) USART_FLAG_NE: to indicate if a noise error occur.
+ (#) USART_FLAG_FE: to indicate if a frame error occur.
+ (#) USART_FLAG_PE: to indicate if a parity error occur.
+ (#) USART_FLAG_ORE: to indicate if an Overrun error occur.
+ [..] In this Mode it is advised to use the following functions:
+ (+) FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG).
+ (+) void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG).
+
+ *** Interrupt Mode ***
+ ======================
+ [..] In Interrupt Mode, the USART communication can be managed by 8 interrupt
+ sources and 10 pending bits:
+ (+) Pending Bits:
+ (##) USART_IT_WU: to indicate the status of the Wake up interrupt.
+ (##) USART_IT_CM: to indicate the status of Character match interrupt.
+ (##) USART_IT_EOB: to indicate the status of End of block interrupt.
+ (##) USART_IT_RTO: to indicate the status of Receive time out interrupt.
+ (##) USART_IT_CTS: to indicate the status of CTS change interrupt.
+ (##) USART_IT_LBD: to indicate the status of LIN Break detection interrupt.
+ (##) USART_IT_TC: to indicate the status of Transmission complete interrupt.
+ (##) USART_IT_IDLE: to indicate the status of IDLE line detected interrupt.
+ (##) USART_IT_ORE: to indicate the status of OverRun Error interrupt.
+ (##) USART_IT_NE: to indicate the status of Noise Error interrupt.
+ (##) USART_IT_FE: to indicate the status of Framing Error interrupt.
+ (##) USART_IT_PE: to indicate the status of Parity Error interrupt.
+
+ (+) Interrupt Source:
+ (##) USART_IT_WU: specifies the interrupt source for Wake up interrupt.
+ (##) USART_IT_CM: specifies the interrupt source for Character match
+ interrupt.
+ (##) USART_IT_EOB: specifies the interrupt source for End of block
+ interrupt.
+ (##) USART_IT_RTO: specifies the interrupt source for Receive time-out
+ interrupt.
+ (##) USART_IT_CTS: specifies the interrupt source for CTS change interrupt.
+ (##) USART_IT_LBD: specifies the interrupt source for LIN Break
+ detection interrupt.
+ (##) USART_IT_TXE: specifies the interrupt source for Tansmit Data
+ Register empty interrupt.
+ (##) USART_IT_TC: specifies the interrupt source for Transmission
+ complete interrupt.
+ (##) USART_IT_RXNE: specifies the interrupt source for Receive Data
+ register not empty interrupt.
+ (##) USART_IT_IDLE: specifies the interrupt source for Idle line
+ detection interrupt.
+ (##) USART_IT_PE: specifies the interrupt source for Parity Error interrupt.
+ (##) USART_IT_ERR: specifies the interrupt source for Error interrupt
+ (Frame error, noise error, overrun error)
+ -@@- Some parameters are coded in order to use them as interrupt
+ source or as pending bits.
+ [..] In this Mode it is advised to use the following functions:
+ (+) void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState).
+ (+) ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT).
+ (+) void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT).
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Enables or disables the specified USART interrupts.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_IT: specifies the USART interrupt sources to be enabled or disabled.
+ * This parameter can be one of the following values:
+ * @arg USART_IT_WU: Wake up interrupt, not available for STM32F030 devices.
+ * @arg USART_IT_CM: Character match interrupt.
+ * @arg USART_IT_EOB: End of block interrupt, not available for STM32F030 devices.
+ * @arg USART_IT_RTO: Receive time out interrupt.
+ * @arg USART_IT_CTS: CTS change interrupt.
+ * @arg USART_IT_LBD: LIN Break detection interrupt, not available for STM32F030 devices.
+ * @arg USART_IT_TXE: Tansmit Data Register empty interrupt.
+ * @arg USART_IT_TC: Transmission complete interrupt.
+ * @arg USART_IT_RXNE: Receive Data register not empty interrupt.
+ * @arg USART_IT_IDLE: Idle line detection interrupt.
+ * @arg USART_IT_PE: Parity Error interrupt.
+ * @arg USART_IT_ERR: Error interrupt(Frame error, noise error, overrun error)
+ * @param NewState: new state of the specified USARTx interrupts.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_ITConfig(USART_TypeDef* USARTx, uint32_t USART_IT, FunctionalState NewState)
+{
+ uint32_t usartreg = 0, itpos = 0, itmask = 0;
+ uint32_t usartxbase = 0;
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_CONFIG_IT(USART_IT));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ usartxbase = (uint32_t)USARTx;
+
+ /* Get the USART register index */
+ usartreg = (((uint16_t)USART_IT) >> 0x08);
+
+ /* Get the interrupt position */
+ itpos = USART_IT & IT_MASK;
+ itmask = (((uint32_t)0x01) << itpos);
+
+ if (usartreg == 0x02) /* The IT is in CR2 register */
+ {
+ usartxbase += 0x04;
+ }
+ else if (usartreg == 0x03) /* The IT is in CR3 register */
+ {
+ usartxbase += 0x08;
+ }
+ else /* The IT is in CR1 register */
+ {
+ }
+ if (NewState != DISABLE)
+ {
+ *(__IO uint32_t*)usartxbase |= itmask;
+ }
+ else
+ {
+ *(__IO uint32_t*)usartxbase &= ~itmask;
+ }
+}
+
+/**
+ * @brief Enables the specified USART's Request.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_Request: specifies the USART request.
+ * This parameter can be any combination of the following values:
+ * @arg USART_Request_TXFRQ: Transmit data flush ReQuest
+ * @arg USART_Request_RXFRQ: Receive data flush ReQuest
+ * @arg USART_Request_MMRQ: Mute Mode ReQuest
+ * @arg USART_Request_SBKRQ: Send Break ReQuest
+ * @arg USART_Request_ABRRQ: Auto Baud Rate ReQuest
+ * @param NewState: new state of the DMA interface when reception error occurs.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_RequestCmd(USART_TypeDef* USARTx, uint32_t USART_Request, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_REQUEST(USART_Request));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the USART ReQuest by setting the dedicated request bit in the RQR
+ register.*/
+ USARTx->RQR |= USART_Request;
+ }
+ else
+ {
+ /* Disable the USART ReQuest by clearing the dedicated request bit in the RQR
+ register.*/
+ USARTx->RQR &= (uint32_t)~USART_Request;
+ }
+}
+
+/**
+ * @brief Enables or disables the USART's Overrun detection.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_OVRDetection: specifies the OVR detection status in case of OVR error.
+ * This parameter can be any combination of the following values:
+ * @arg USART_OVRDetection_Enable: OVR error detection enabled when
+ * the USART OVR error is asserted.
+ * @arg USART_OVRDetection_Disable: OVR error detection disabled when
+ * the USART OVR error is asserted.
+ * @retval None
+ */
+void USART_OverrunDetectionConfig(USART_TypeDef* USARTx, uint32_t USART_OVRDetection)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_OVRDETECTION(USART_OVRDetection));
+
+ /* Clear the OVR detection bit */
+ USARTx->CR3 &= (uint32_t)~((uint32_t)USART_CR3_OVRDIS);
+ /* Set the new value for the OVR detection bit */
+ USARTx->CR3 |= USART_OVRDetection;
+}
+
+/**
+ * @brief Checks whether the specified USART flag is set or not.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_FLAG: specifies the flag to check.
+ * This parameter can be one of the following values:
+ * @arg USART_FLAG_REACK: Receive Enable acknowledge flag.
+ * @arg USART_FLAG_TEACK: Transmit Enable acknowledge flag.
+ * @arg USART_FLAG_WU: Wake up flag, not available for STM32F030 devices.
+ * @arg USART_FLAG_RWU: Receive Wake up flag, not available for STM32F030 devices.
+ * @arg USART_FLAG_SBK: Send Break flag.
+ * @arg USART_FLAG_CM: Character match flag.
+ * @arg USART_FLAG_BUSY: Busy flag.
+ * @arg USART_FLAG_ABRF: Auto baud rate flag.
+ * @arg USART_FLAG_ABRE: Auto baud rate error flag.
+ * @arg USART_FLAG_EOB: End of block flag, not available for STM32F030 devices.
+ * @arg USART_FLAG_RTO: Receive time out flag.
+ * @arg USART_FLAG_nCTSS: Inverted nCTS input bit status.
+ * @arg USART_FLAG_CTS: CTS Change flag.
+ * @arg USART_FLAG_LBD: LIN Break detection flag, not available for STM32F030 devices.
+ * @arg USART_FLAG_TXE: Transmit data register empty flag.
+ * @arg USART_FLAG_TC: Transmission Complete flag.
+ * @arg USART_FLAG_RXNE: Receive data register not empty flag.
+ * @arg USART_FLAG_IDLE: Idle Line detection flag.
+ * @arg USART_FLAG_ORE: OverRun Error flag.
+ * @arg USART_FLAG_NE: Noise Error flag.
+ * @arg USART_FLAG_FE: Framing Error flag.
+ * @arg USART_FLAG_PE: Parity Error flag.
+ * @retval The new state of USART_FLAG (SET or RESET).
+ */
+FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint32_t USART_FLAG)
+{
+ FlagStatus bitstatus = RESET;
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_FLAG(USART_FLAG));
+
+ if ((USARTx->ISR & USART_FLAG) != (uint16_t)RESET)
+ {
+ bitstatus = SET;
+ }
+ else
+ {
+ bitstatus = RESET;
+ }
+ return bitstatus;
+}
+
+/**
+ * @brief Clears the USARTx's pending flags.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_FLAG: specifies the flag to clear.
+ * This parameter can be any combination of the following values:
+ * @arg USART_FLAG_WU: Wake up flag, not available for STM32F030 devices.
+ * @arg USART_FLAG_CM: Character match flag.
+ * @arg USART_FLAG_EOB: End of block flag, not available for STM32F030 devices.
+ * @arg USART_FLAG_RTO: Receive time out flag.
+ * @arg USART_FLAG_CTS: CTS Change flag.
+ * @arg USART_FLAG_LBD: LIN Break detection flag, not available for STM32F030 devices.
+ * @arg USART_FLAG_TC: Transmission Complete flag.
+ * @arg USART_FLAG_IDLE: IDLE line detected flag.
+ * @arg USART_FLAG_ORE: OverRun Error flag.
+ * @arg USART_FLAG_NE: Noise Error flag.
+ * @arg USART_FLAG_FE: Framing Error flag.
+ * @arg USART_FLAG_PE: Parity Errorflag.
+ *
+ * @note RXNE pending bit is cleared by a read to the USART_RDR register
+ * (USART_ReceiveData()) or by writing 1 to the RXFRQ in the register
+ * USART_RQR (USART_RequestCmd()).
+ * @note TC flag can be also cleared by software sequence: a read operation
+ * to USART_SR register (USART_GetFlagStatus()) followed by a write
+ * operation to USART_TDR register (USART_SendData()).
+ * @note TXE flag is cleared by a write to the USART_TDR register (USART_SendData())
+ * or by writing 1 to the TXFRQ in the register USART_RQR (USART_RequestCmd()).
+ * @note SBKF flag is cleared by 1 to the SBKRQ in the register USART_RQR
+ * (USART_RequestCmd()).
+ * @retval None
+ */
+void USART_ClearFlag(USART_TypeDef* USARTx, uint32_t USART_FLAG)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_CLEAR_FLAG(USART_FLAG));
+
+ USARTx->ICR = USART_FLAG;
+}
+
+/**
+ * @brief Checks whether the specified USART interrupt has occurred or not.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_IT: specifies the USART interrupt source to check.
+ * This parameter can be one of the following values:
+ * @arg USART_IT_WU: Wake up interrupt, not available for STM32F030 devices.
+ * @arg USART_IT_CM: Character match interrupt.
+ * @arg USART_IT_EOB: End of block interrupt, not available for STM32F030 devices.
+ * @arg USART_IT_RTO: Receive time out interrupt.
+ * @arg USART_IT_CTS: CTS change interrupt.
+ * @arg USART_IT_LBD: LIN Break detection interrupt, not available for STM32F030 devices.
+ * @arg USART_IT_TXE: Tansmit Data Register empty interrupt.
+ * @arg USART_IT_TC: Transmission complete interrupt.
+ * @arg USART_IT_RXNE: Receive Data register not empty interrupt.
+ * @arg USART_IT_IDLE: Idle line detection interrupt.
+ * @arg USART_IT_ORE: OverRun Error interrupt.
+ * @arg USART_IT_NE: Noise Error interrupt.
+ * @arg USART_IT_FE: Framing Error interrupt.
+ * @arg USART_IT_PE: Parity Error interrupt.
+ * @retval The new state of USART_IT (SET or RESET).
+ */
+ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint32_t USART_IT)
+{
+ uint32_t bitpos = 0, itmask = 0, usartreg = 0;
+ ITStatus bitstatus = RESET;
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_GET_IT(USART_IT));
+
+ /* Get the USART register index */
+ usartreg = (((uint16_t)USART_IT) >> 0x08);
+ /* Get the interrupt position */
+ itmask = USART_IT & IT_MASK;
+ itmask = (uint32_t)0x01 << itmask;
+
+ if (usartreg == 0x01) /* The IT is in CR1 register */
+ {
+ itmask &= USARTx->CR1;
+ }
+ else if (usartreg == 0x02) /* The IT is in CR2 register */
+ {
+ itmask &= USARTx->CR2;
+ }
+ else /* The IT is in CR3 register */
+ {
+ itmask &= USARTx->CR3;
+ }
+
+ bitpos = USART_IT >> 0x10;
+ bitpos = (uint32_t)0x01 << bitpos;
+ bitpos &= USARTx->ISR;
+ if ((itmask != (uint16_t)RESET)&&(bitpos != (uint16_t)RESET))
+ {
+ bitstatus = SET;
+ }
+ else
+ {
+ bitstatus = RESET;
+ }
+
+ return bitstatus;
+}
+
+/**
+ * @brief Clears the USARTx's interrupt pending bits.
+ * @param USARTx: where x can be 1, 2, 3 or 4 to select the USART peripheral.
+ * @note USART3 and USART4 are available only for STM32F072 devices.
+ * @note USART2 is not available for STM32F031 devices.
+ * @param USART_IT: specifies the interrupt pending bit to clear.
+ * This parameter can be one of the following values:
+ * @arg USART_IT_WU: Wake up interrupt, not available for STM32F030 devices.
+ * @arg USART_IT_CM: Character match interrupt.
+ * @arg USART_IT_EOB: End of block interrupt, not available for STM32F030 devices.
+ * @arg USART_IT_RTO: Receive time out interrupt.
+ * @arg USART_IT_CTS: CTS change interrupt.
+ * @arg USART_IT_LBD: LIN Break detection interrupt, not available for STM32F030 devices.
+ * @arg USART_IT_TC: Transmission complete interrupt.
+ * @arg USART_IT_IDLE: IDLE line detected interrupt.
+ * @arg USART_IT_ORE: OverRun Error interrupt.
+ * @arg USART_IT_NE: Noise Error interrupt.
+ * @arg USART_IT_FE: Framing Error interrupt.
+ * @arg USART_IT_PE: Parity Error interrupt.
+ *
+ * @note RXNE pending bit is cleared by a read to the USART_RDR register
+ * (USART_ReceiveData()) or by writing 1 to the RXFRQ in the register
+ * USART_RQR (USART_RequestCmd()).
+ * @note TC pending bit can be also cleared by software sequence: a read
+ * operation to USART_SR register (USART_GetITStatus()) followed by
+ * a write operation to USART_TDR register (USART_SendData()).
+ * @note TXE pending bit is cleared by a write to the USART_TDR register
+ * (USART_SendData()) or by writing 1 to the TXFRQ in the register
+ * USART_RQR (USART_RequestCmd()).
+ * @retval None
+ */
+void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint32_t USART_IT)
+{
+ uint32_t bitpos = 0, itmask = 0;
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_CLEAR_IT(USART_IT));
+
+ bitpos = USART_IT >> 0x10;
+ itmask = ((uint32_t)0x01 << (uint32_t)bitpos);
+ USARTx->ICR = (uint32_t)itmask;
+}
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/