Peter Drescher
mbed library with additional peripherals for ST F401 board
Fork of
mbed-src
by 
mbed official
This mbed LIB has additional peripherals for ST F401 board
- UART2 : PA_3 rx, PA_2 tx
- UART3 : PC_7 rx, PC_6 tx
- I2C2 : PB_3 SDA, PB_10 SCL
- I2C3 : PB_4 SDA, PA_8 SCL
Diff: targets/cmsis/TARGET_STM/TARGET_NUCLEO_L152RE/stm32l1xx_rcc.c
- Revision:
- 76:aeb1df146756
- Child:
- 80:66393a7b209d
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_NUCLEO_L152RE/stm32l1xx_rcc.c Mon Jan 27 14:30:07 2014 +0000
@@ -0,0 +1,1642 @@
+/**
+ ******************************************************************************
+ * @file stm32l1xx_rcc.c
+ * @author MCD Application Team
+ * @version V1.2.0
+ * @date 22-February-2013
+ * @brief This file provides firmware functions to manage the following
+ * functionalities of the Reset and clock control (RCC) peripheral:
+ * + Internal/external clocks, PLL, CSS and MCO configuration
+ * + System, AHB and APB busses clocks configuration
+ * + Peripheral clocks configuration
+ * + Interrupts and flags management
+ *
+ @verbatim
+
+ ===============================================================================
+ ##### RCC specific features #####
+ ===============================================================================
+ [..] After reset the device is running from MSI (2 MHz) with Flash 0 WS,
+ all peripherals are off except internal SRAM, Flash and JTAG.
+ (#) There is no prescaler on High speed (AHB) and Low speed (APB) busses;
+ all peripherals mapped on these busses are running at MSI speed.
+ (#) The clock for all peripherals is switched off, except the SRAM and
+ FLASH.
+ (#) All GPIOs are in input floating state, except the JTAG pins which
+ are assigned to be used for debug purpose.
+ [..] Once the device started from reset, the user application has to:
+ (#) Configure the clock source to be used to drive the System clock
+ (if the application needs higher frequency/performance)
+ (#) Configure the System clock frequency and Flash settings
+ (#) Configure the AHB and APB busses prescalers
+ (#) Enable the clock for the peripheral(s) to be used
+ (#) Configure the clock source(s) for peripherals whose clocks are not
+ derived from the System clock (ADC, RTC/LCD and IWDG)
+
+ @endverbatim
+
+ ******************************************************************************
+ * @attention
+ *
+ * <h2><center>© COPYRIGHT 2013 STMicroelectronics</center></h2>
+ *
+ * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.st.com/software_license_agreement_liberty_v2
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ ******************************************************************************
+ */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32l1xx_rcc.h"
+
+/** @addtogroup STM32L1xx_StdPeriph_Driver
+ * @{
+ */
+
+/** @defgroup RCC
+ * @brief RCC driver modules
+ * @{
+ */
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+
+/* ------------ RCC registers bit address in the alias region ----------- */
+#define RCC_OFFSET (RCC_BASE - PERIPH_BASE)
+
+/* --- CR Register ---*/
+
+/* Alias word address of HSION bit */
+#define CR_OFFSET (RCC_OFFSET + 0x00)
+#define HSION_BitNumber 0x00
+#define CR_HSION_BB (PERIPH_BB_BASE + (CR_OFFSET * 32) + (HSION_BitNumber * 4))
+
+/* Alias word address of MSION bit */
+#define MSION_BitNumber 0x08
+#define CR_MSION_BB (PERIPH_BB_BASE + (CR_OFFSET * 32) + (MSION_BitNumber * 4))
+
+/* Alias word address of PLLON bit */
+#define PLLON_BitNumber 0x18
+#define CR_PLLON_BB (PERIPH_BB_BASE + (CR_OFFSET * 32) + (PLLON_BitNumber * 4))
+
+/* Alias word address of CSSON bit */
+#define CSSON_BitNumber 0x1C
+#define CR_CSSON_BB (PERIPH_BB_BASE + (CR_OFFSET * 32) + (CSSON_BitNumber * 4))
+
+/* --- CSR Register ---*/
+
+/* Alias word address of LSION bit */
+#define CSR_OFFSET (RCC_OFFSET + 0x34)
+#define LSION_BitNumber 0x00
+#define CSR_LSION_BB (PERIPH_BB_BASE + (CSR_OFFSET * 32) + (LSION_BitNumber * 4))
+
+/* Alias word address of LSECSSON bit */
+#define LSECSSON_BitNumber 0x0B
+#define CSR_LSECSSON_BB (PERIPH_BB_BASE + (CSR_OFFSET * 32) + (LSECSSON_BitNumber * 4))
+
+/* Alias word address of RTCEN bit */
+#define RTCEN_BitNumber 0x16
+#define CSR_RTCEN_BB (PERIPH_BB_BASE + (CSR_OFFSET * 32) + (RTCEN_BitNumber * 4))
+
+/* Alias word address of RTCRST bit */
+#define RTCRST_BitNumber 0x17
+#define CSR_RTCRST_BB (PERIPH_BB_BASE + (CSR_OFFSET * 32) + (RTCRST_BitNumber * 4))
+
+
+/* ---------------------- RCC registers mask -------------------------------- */
+/* RCC Flag Mask */
+#define FLAG_MASK ((uint8_t)0x1F)
+
+/* CR register byte 3 (Bits[23:16]) base address */
+#define CR_BYTE3_ADDRESS ((uint32_t)0x40023802)
+
+/* ICSCR register byte 4 (Bits[31:24]) base address */
+#define ICSCR_BYTE4_ADDRESS ((uint32_t)0x40023807)
+
+/* CFGR register byte 3 (Bits[23:16]) base address */
+#define CFGR_BYTE3_ADDRESS ((uint32_t)0x4002380A)
+
+/* CFGR register byte 4 (Bits[31:24]) base address */
+#define CFGR_BYTE4_ADDRESS ((uint32_t)0x4002380B)
+
+/* CIR register byte 2 (Bits[15:8]) base address */
+#define CIR_BYTE2_ADDRESS ((uint32_t)0x4002380D)
+
+/* CIR register byte 3 (Bits[23:16]) base address */
+#define CIR_BYTE3_ADDRESS ((uint32_t)0x4002380E)
+
+/* CSR register byte 2 (Bits[15:8]) base address */
+#define CSR_BYTE2_ADDRESS ((uint32_t)0x40023835)
+
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+
+static __I uint8_t PLLMulTable[9] = {3, 4, 6, 8, 12, 16, 24, 32, 48};
+static __I uint8_t APBAHBPrescTable[16] = {0, 0, 0, 0, 1, 2, 3, 4, 1, 2, 3, 4, 6, 7, 8, 9};
+
+/* Private function prototypes -----------------------------------------------*/
+/* Private functions ---------------------------------------------------------*/
+
+/** @defgroup RCC_Private_Functions
+ * @{
+ */
+
+/** @defgroup RCC_Group1 Internal and external clocks, PLL, CSS and MCO configuration functions
+ * @brief Internal and external clocks, PLL, CSS and MCO configuration functions
+ *
+@verbatim
+ ===============================================================================
+ ##### Internal-external clocks, PLL, CSS and MCO configuration functions #####
+ ===============================================================================
+ [..] This section provide functions allowing to configure the internal/external
+ clocks, PLL, CSS and MCO.
+ (#) HSI (high-speed internal), 16 MHz factory-trimmed RC used directly
+ or through the PLL as System clock source.
+ (#) MSI (multi-speed internal), multispeed low power RC
+ (65.536 KHz to 4.194 MHz) MHz used as System clock source.
+ (#) LSI (low-speed internal), 37 KHz low consumption RC used as IWDG
+ and/or RTC clock source.
+ (#) HSE (high-speed external), 1 to 24 MHz crystal oscillator used
+ directly or through the PLL as System clock source. Can be used
+ also as RTC clock source.
+ (#) LSE (low-speed external), 32 KHz oscillator used as RTC clock source.
+ (#) PLL (clocked by HSI or HSE), for System clock and USB (48 MHz).
+ (#) CSS (Clock security system), once enable and if a HSE clock failure
+ occurs (HSE used directly or through PLL as System clock source),
+ the System clock is automatically switched to MSI and an interrupt
+ is generated if enabled.
+ The interrupt is linked to the Cortex-M3 NMI (Non-Maskable Interrupt)
+ exception vector.
+ (#) MCO (microcontroller clock output), used to output SYSCLK, HSI, MSI,
+ HSE, PLL, LSI or LSE clock (through a configurable prescaler) on
+ PA8 pin.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Resets the RCC clock configuration to the default reset state.
+ * @note The default reset state of the clock configuration is given below:
+ * @note MSI ON and used as system clock source (MSI range is not modified
+ * by this function, it keep the value configured by user application)
+ * @note HSI, HSE and PLL OFF
+ * @note AHB, APB1 and APB2 prescaler set to 1.
+ * @note CSS and MCO OFF
+ * @note All interrupts disabled
+ * @note However, this function doesn't modify the configuration of the
+ * @note Peripheral clocks
+ * @note LSI, LSE and RTC clocks
+ * @param None
+ * @retval None
+ */
+void RCC_DeInit(void)
+{
+
+ /* Set MSION bit */
+ RCC->CR |= (uint32_t)0x00000100;
+
+ /* Reset SW[1:0], HPRE[3:0], PPRE1[2:0], PPRE2[2:0], MCOSEL[2:0] and MCOPRE[2:0] bits */
+ RCC->CFGR &= (uint32_t)0x88FFC00C;
+
+ /* Reset HSION, HSEON, CSSON and PLLON bits */
+ RCC->CR &= (uint32_t)0xEEFEFFFE;
+
+ /* Reset HSEBYP bit */
+ RCC->CR &= (uint32_t)0xFFFBFFFF;
+
+ /* Reset PLLSRC, PLLMUL[3:0] and PLLDIV[1:0] bits */
+ RCC->CFGR &= (uint32_t)0xFF02FFFF;
+
+ /* Disable all interrupts */
+ RCC->CIR = 0x00000000;
+}
+
+/**
+ * @brief Configures the External High Speed oscillator (HSE).
+ * @note After enabling the HSE (RCC_HSE_ON or RCC_HSE_Bypass), the application
+ * software should wait on HSERDY flag to be set indicating that HSE clock
+ * is stable and can be used to clock the PLL and/or system clock.
+ * @note HSE state can not be changed if it is used directly or through the
+ * PLL as system clock. In this case, you have to select another source
+ * of the system clock then change the HSE state (ex. disable it).
+ * @note The HSE is stopped by hardware when entering STOP and STANDBY modes.
+ * @note This function reset the CSSON bit, so if the Clock security system(CSS)
+ * was previously enabled you have to enable it again after calling this
+ * function.
+ * @param RCC_HSE: specifies the new state of the HSE.
+ * This parameter can be one of the following values:
+ * @arg RCC_HSE_OFF: turn OFF the HSE oscillator, HSERDY flag goes low after
+ * 6 HSE oscillator clock cycles.
+ * @arg RCC_HSE_ON: turn ON the HSE oscillator
+ * @arg RCC_HSE_Bypass: HSE oscillator bypassed with external clock
+ * @retval None
+ */
+void RCC_HSEConfig(uint8_t RCC_HSE)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_HSE(RCC_HSE));
+
+ /* Reset HSEON and HSEBYP bits before configuring the HSE ------------------*/
+ *(__IO uint8_t *) CR_BYTE3_ADDRESS = RCC_HSE_OFF;
+
+ /* Set the new HSE configuration -------------------------------------------*/
+ *(__IO uint8_t *) CR_BYTE3_ADDRESS = RCC_HSE;
+
+}
+
+/**
+ * @brief Waits for HSE start-up.
+ * @note This functions waits on HSERDY flag to be set and return SUCCESS if
+ * this flag is set, otherwise returns ERROR if the timeout is reached
+ * and this flag is not set. The timeout value is defined by the constant
+ * HSE_STARTUP_TIMEOUT in stm32l1xx.h file. You can tailor it depending
+ * on the HSE crystal used in your application.
+ * @param None
+ * @retval An ErrorStatus enumeration value:
+ * - SUCCESS: HSE oscillator is stable and ready to use
+ * - ERROR: HSE oscillator not yet ready
+ */
+ErrorStatus RCC_WaitForHSEStartUp(void)
+{
+ __IO uint32_t StartUpCounter = 0;
+ ErrorStatus status = ERROR;
+ FlagStatus HSEStatus = RESET;
+
+ /* Wait till HSE is ready and if timeout is reached exit */
+ do
+ {
+ HSEStatus = RCC_GetFlagStatus(RCC_FLAG_HSERDY);
+ StartUpCounter++;
+ } while((StartUpCounter != HSE_STARTUP_TIMEOUT) && (HSEStatus == RESET));
+
+ if (RCC_GetFlagStatus(RCC_FLAG_HSERDY) != RESET)
+ {
+ status = SUCCESS;
+ }
+ else
+ {
+ status = ERROR;
+ }
+ return (status);
+}
+
+/**
+ * @brief Adjusts the Internal Multi Speed oscillator (MSI) calibration value.
+ * @note The calibration is used to compensate for the variations in voltage
+ * and temperature that influence the frequency of the internal MSI RC.
+ * Refer to the Application Note AN3300 for more details on how to
+ * calibrate the MSI.
+ * @param MSICalibrationValue: specifies the MSI calibration trimming value.
+ * This parameter must be a number between 0 and 0xFF.
+ * @retval None
+ */
+void RCC_AdjustMSICalibrationValue(uint8_t MSICalibrationValue)
+{
+
+ /* Check the parameters */
+ assert_param(IS_RCC_MSI_CALIBRATION_VALUE(MSICalibrationValue));
+
+ *(__IO uint8_t *) ICSCR_BYTE4_ADDRESS = MSICalibrationValue;
+}
+
+/**
+ * @brief Configures the Internal Multi Speed oscillator (MSI) clock range.
+ * @note After restart from Reset or wakeup from STANDBY, the MSI clock is
+ * around 2.097 MHz. The MSI clock does not change after wake-up from
+ * STOP mode.
+ * @note The MSI clock range can be modified on the fly.
+ * @param RCC_MSIRange: specifies the MSI Clock range.
+ * This parameter must be one of the following values:
+ * @arg RCC_MSIRange_0: MSI clock is around 65.536 KHz
+ * @arg RCC_MSIRange_1: MSI clock is around 131.072 KHz
+ * @arg RCC_MSIRange_2: MSI clock is around 262.144 KHz
+ * @arg RCC_MSIRange_3: MSI clock is around 524.288 KHz
+ * @arg RCC_MSIRange_4: MSI clock is around 1.048 MHz
+ * @arg RCC_MSIRange_5: MSI clock is around 2.097 MHz (default after Reset or wake-up from STANDBY)
+ * @arg RCC_MSIRange_6: MSI clock is around 4.194 MHz
+ *
+ * @retval None
+ */
+void RCC_MSIRangeConfig(uint32_t RCC_MSIRange)
+{
+ uint32_t tmpreg = 0;
+
+ /* Check the parameters */
+ assert_param(IS_RCC_MSI_CLOCK_RANGE(RCC_MSIRange));
+
+ tmpreg = RCC->ICSCR;
+
+ /* Clear MSIRANGE[2:0] bits */
+ tmpreg &= ~RCC_ICSCR_MSIRANGE;
+
+ /* Set the MSIRANGE[2:0] bits according to RCC_MSIRange value */
+ tmpreg |= (uint32_t)RCC_MSIRange;
+
+ /* Store the new value */
+ RCC->ICSCR = tmpreg;
+}
+
+/**
+ * @brief Enables or disables the Internal Multi Speed oscillator (MSI).
+ * @note The MSI is stopped by hardware when entering STOP and STANDBY modes.
+ * It is used (enabled by hardware) as system clock source after
+ * startup from Reset, wakeup from STOP and STANDBY mode, or in case
+ * of failure of the HSE used directly or indirectly as system clock
+ * (if the Clock Security System CSS is enabled).
+ * @note MSI can not be stopped if it is used as system clock source.
+ * In this case, you have to select another source of the system
+ * clock then stop the MSI.
+ * @note After enabling the MSI, the application software should wait on
+ * MSIRDY flag to be set indicating that MSI clock is stable and can
+ * be used as system clock source.
+ * @param NewState: new state of the MSI.
+ * This parameter can be: ENABLE or DISABLE.
+ * @note When the MSI is stopped, MSIRDY flag goes low after 6 MSI oscillator
+ * clock cycles.
+ * @retval None
+ */
+void RCC_MSICmd(FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ *(__IO uint32_t *) CR_MSION_BB = (uint32_t)NewState;
+}
+
+/**
+ * @brief Adjusts the Internal High Speed oscillator (HSI) calibration value.
+ * @note The calibration is used to compensate for the variations in voltage
+ * and temperature that influence the frequency of the internal HSI RC.
+ * Refer to the Application Note AN3300 for more details on how to
+ * calibrate the HSI.
+ * @param HSICalibrationValue: specifies the HSI calibration trimming value.
+ * This parameter must be a number between 0 and 0x1F.
+ * @retval None
+ */
+void RCC_AdjustHSICalibrationValue(uint8_t HSICalibrationValue)
+{
+ uint32_t tmpreg = 0;
+
+ /* Check the parameters */
+ assert_param(IS_RCC_HSI_CALIBRATION_VALUE(HSICalibrationValue));
+
+ tmpreg = RCC->ICSCR;
+
+ /* Clear HSITRIM[4:0] bits */
+ tmpreg &= ~RCC_ICSCR_HSITRIM;
+
+ /* Set the HSITRIM[4:0] bits according to HSICalibrationValue value */
+ tmpreg |= (uint32_t)HSICalibrationValue << 8;
+
+ /* Store the new value */
+ RCC->ICSCR = tmpreg;
+}
+
+/**
+ * @brief Enables or disables the Internal High Speed oscillator (HSI).
+ * @note After enabling the HSI, the application software should wait on
+ * HSIRDY flag to be set indicating that HSI clock is stable and can
+ * be used to clock the PLL and/or system clock.
+ * @note HSI can not be stopped if it is used directly or through the PLL
+ * as system clock. In this case, you have to select another source
+ * of the system clock then stop the HSI.
+ * @note The HSI is stopped by hardware when entering STOP and STANDBY modes.
+ * @param NewState: new state of the HSI.
+ * This parameter can be: ENABLE or DISABLE.
+ * @note When the HSI is stopped, HSIRDY flag goes low after 6 HSI oscillator
+ * clock cycles.
+ * @retval None
+ */
+void RCC_HSICmd(FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ *(__IO uint32_t *) CR_HSION_BB = (uint32_t)NewState;
+}
+
+/**
+ * @brief Configures the External Low Speed oscillator (LSE).
+ * @note As the LSE is in the RTC domain and write access is denied to this
+ * domain after reset, you have to enable write access using
+ * PWR_RTCAccessCmd(ENABLE) function before to configure the LSE
+ * (to be done once after reset).
+ * @note After enabling the LSE (RCC_LSE_ON or RCC_LSE_Bypass), the application
+ * software should wait on LSERDY flag to be set indicating that LSE clock
+ * is stable and can be used to clock the RTC.
+ * @param RCC_LSE: specifies the new state of the LSE.
+ * This parameter can be one of the following values:
+ * @arg RCC_LSE_OFF: turn OFF the LSE oscillator, LSERDY flag goes low after
+ * 6 LSE oscillator clock cycles.
+ * @arg RCC_LSE_ON: turn ON the LSE oscillator
+ * @arg RCC_LSE_Bypass: LSE oscillator bypassed with external clock
+ * @retval None
+ */
+void RCC_LSEConfig(uint8_t RCC_LSE)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_LSE(RCC_LSE));
+
+ /* Reset LSEON and LSEBYP bits before configuring the LSE ------------------*/
+ *(__IO uint8_t *) CSR_BYTE2_ADDRESS = RCC_LSE_OFF;
+
+ /* Set the new LSE configuration -------------------------------------------*/
+ *(__IO uint8_t *) CSR_BYTE2_ADDRESS = RCC_LSE;
+}
+
+/**
+ * @brief Enables or disables the Internal Low Speed oscillator (LSI).
+ * @note After enabling the LSI, the application software should wait on
+ * LSIRDY flag to be set indicating that LSI clock is stable and can
+ * be used to clock the IWDG and/or the RTC.
+ * @note LSI can not be disabled if the IWDG is running.
+ * @param NewState: new state of the LSI.
+ * This parameter can be: ENABLE or DISABLE.
+ * @note When the LSI is stopped, LSIRDY flag goes low after 6 LSI oscillator
+ * clock cycles.
+ * @retval None
+ */
+void RCC_LSICmd(FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ *(__IO uint32_t *) CSR_LSION_BB = (uint32_t)NewState;
+}
+
+/**
+ * @brief Configures the PLL clock source and multiplication factor.
+ * @note This function must be used only when the PLL is disabled.
+ *
+ * @param RCC_PLLSource: specifies the PLL entry clock source.
+ * This parameter can be one of the following values:
+ * @arg RCC_PLLSource_HSI: HSI oscillator clock selected as PLL clock source
+ * @arg RCC_PLLSource_HSE: HSE oscillator clock selected as PLL clock source
+ * @note The minimum input clock frequency for PLL is 2 MHz (when using HSE as
+ * PLL source).
+ *
+ * @param RCC_PLLMul: specifies the PLL multiplication factor, which drive the PLLVCO clock
+ * This parameter can be:
+ * @arg RCC_PLLMul_3: PLL clock source multiplied by 3
+ * @arg RCC_PLLMul_4: PLL clock source multiplied by 4
+ * @arg RCC_PLLMul_6: PLL clock source multiplied by 6
+ * @arg RCC_PLLMul_8: PLL clock source multiplied by 8
+ * @arg RCC_PLLMul_12: PLL clock source multiplied by 12
+ * @arg RCC_PLLMul_16: PLL clock source multiplied by 16
+ * @arg RCC_PLLMul_24: PLL clock source multiplied by 24
+ * @arg RCC_PLLMul_32: PLL clock source multiplied by 32
+ * @arg RCC_PLLMul_48: PLL clock source multiplied by 48
+ * @note The application software must set correctly the PLL multiplication
+ * factor to avoid exceeding:
+ * - 96 MHz as PLLVCO when the product is in range 1
+ * - 48 MHz as PLLVCO when the product is in range 2
+ * - 24 MHz when the product is in range 3
+ * @note When using the USB the PLLVCO should be 96MHz
+ *
+ * @param RCC_PLLDiv: specifies the PLL division factor.
+ * This parameter can be:
+ * @arg RCC_PLLDiv_2: PLL Clock output divided by 2
+ * @arg RCC_PLLDiv_3: PLL Clock output divided by 3
+ * @arg RCC_PLLDiv_4: PLL Clock output divided by 4
+ * @note The application software must set correctly the output division to avoid
+ * exceeding 32 MHz as SYSCLK.
+ *
+ * @retval None
+ */
+void RCC_PLLConfig(uint8_t RCC_PLLSource, uint8_t RCC_PLLMul, uint8_t RCC_PLLDiv)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_PLL_SOURCE(RCC_PLLSource));
+ assert_param(IS_RCC_PLL_MUL(RCC_PLLMul));
+ assert_param(IS_RCC_PLL_DIV(RCC_PLLDiv));
+
+ *(__IO uint8_t *) CFGR_BYTE3_ADDRESS = (uint8_t)(RCC_PLLSource | ((uint8_t)(RCC_PLLMul | (uint8_t)(RCC_PLLDiv))));
+}
+
+/**
+ * @brief Enables or disables the PLL.
+ * @note After enabling the PLL, the application software should wait on
+ * PLLRDY flag to be set indicating that PLL clock is stable and can
+ * be used as system clock source.
+ * @note The PLL can not be disabled if it is used as system clock source
+ * @note The PLL is disabled by hardware when entering STOP and STANDBY modes.
+ * @param NewState: new state of the PLL.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_PLLCmd(FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ *(__IO uint32_t *) CR_PLLON_BB = (uint32_t)NewState;
+}
+
+/**
+ * @brief Enables or disables the Clock Security System.
+ * @note If a failure is detected on the HSE oscillator clock, this oscillator
+ * is automatically disabled and an interrupt is generated to inform the
+ * software about the failure (Clock Security System Interrupt, CSSI),
+ * allowing the MCU to perform rescue operations. The CSSI is linked to
+ * the Cortex-M3 NMI (Non-Maskable Interrupt) exception vector.
+ * @param NewState: new state of the Clock Security System.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_ClockSecuritySystemCmd(FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ *(__IO uint32_t *) CR_CSSON_BB = (uint32_t)NewState;
+}
+
+/**
+ * @brief Enables or disables the LSE Clock Security System.
+ * @param NewState: new state of the Clock Security System.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_LSEClockSecuritySystemCmd(FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ *(__IO uint32_t *) CSR_LSECSSON_BB = (uint32_t)NewState;
+}
+
+/**
+ * @brief Selects the clock source to output on MCO pin (PA8).
+ * @note PA8 should be configured in alternate function mode.
+ * @param RCC_MCOSource: specifies the clock source to output.
+ * This parameter can be one of the following values:
+ * @arg RCC_MCOSource_NoClock: No clock selected
+ * @arg RCC_MCOSource_SYSCLK: System clock selected
+ * @arg RCC_MCOSource_HSI: HSI oscillator clock selected
+ * @arg RCC_MCOSource_MSI: MSI oscillator clock selected
+ * @arg RCC_MCOSource_HSE: HSE oscillator clock selected
+ * @arg RCC_MCOSource_PLLCLK: PLL clock selected
+ * @arg RCC_MCOSource_LSI: LSI clock selected
+ * @arg RCC_MCOSource_LSE: LSE clock selected
+ * @param RCC_MCODiv: specifies the MCO prescaler.
+ * This parameter can be one of the following values:
+ * @arg RCC_MCODiv_1: no division applied to MCO clock
+ * @arg RCC_MCODiv_2: division by 2 applied to MCO clock
+ * @arg RCC_MCODiv_4: division by 4 applied to MCO clock
+ * @arg RCC_MCODiv_8: division by 8 applied to MCO clock
+ * @arg RCC_MCODiv_16: division by 16 applied to MCO clock
+ * @retval None
+ */
+void RCC_MCOConfig(uint8_t RCC_MCOSource, uint8_t RCC_MCODiv)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_MCO_SOURCE(RCC_MCOSource));
+ assert_param(IS_RCC_MCO_DIV(RCC_MCODiv));
+
+ /* Select MCO clock source and prescaler */
+ *(__IO uint8_t *) CFGR_BYTE4_ADDRESS = RCC_MCOSource | RCC_MCODiv;
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup RCC_Group2 System AHB and APB busses clocks configuration functions
+ * @brief System, AHB and APB busses clocks configuration functions
+ *
+@verbatim
+ ===============================================================================
+ ##### System, AHB and APB busses clocks configuration functions #####
+ ===============================================================================
+ [..] This section provide functions allowing to configure the System, AHB,
+ APB1 and APB2 busses clocks.
+ (#) Several clock sources can be used to drive the System clock (SYSCLK):
+ MSI, HSI, HSE and PLL.
+ The AHB clock (HCLK) is derived from System clock through configurable
+ prescaler and used to clock the CPU, memory and peripherals mapped
+ on AHB bus (DMA and GPIO).APB1 (PCLK1) and APB2 (PCLK2) clocks are
+ derived from AHB clock through configurable prescalers and used to
+ clock the peripherals mapped on these busses. You can use
+ "RCC_GetClocksFreq()" function to retrieve the frequencies of these
+ clocks.
+
+ -@- All the peripheral clocks are derived from the System clock (SYSCLK)
+ except:
+ (+@) The USB 48 MHz clock which is derived from the PLL VCO clock.
+ (+@) The ADC clock which is always the HSI clock. A divider by 1, 2
+ or 4 allows to adapt the clock frequency to the device operating
+ conditions.
+ (+@) The RTC/LCD clock which is derived from the LSE, LSI or 1 MHz
+ HSE_RTC (HSE divided by a programmable prescaler).
+ The System clock (SYSCLK) frequency must be higher or equal to
+ the RTC/LCD clock frequency.
+ (+@) IWDG clock which is always the LSI clock.
+
+ (#) The maximum frequency of the SYSCLK, HCLK, PCLK1 and PCLK2 is 32 MHz.
+ Depending on the device voltage range, the maximum frequency should
+ be adapted accordingly:
+
+ +----------------------------------------------------------------+
+ | Wait states | HCLK clock frequency (MHz) |
+ | |------------------------------------------------|
+ | (Latency) | voltage range | voltage range |
+ | | 1.65 V - 3.6 V | 2.0 V - 3.6 V |
+ | |----------------|---------------|---------------|
+ | | VCORE = 1.2 V | VCORE = 1.5 V | VCORE = 1.8 V |
+ |-------------- |----------------|---------------|---------------|
+ |0WS(1CPU cycle)|0 < HCLK <= 2 |0 < HCLK <= 8 |0 < HCLK <= 16 |
+ |---------------|----------------|---------------|---------------|
+ |1WS(2CPU cycle)|2 < HCLK <= 4 |8 < HCLK <= 16 |16 < HCLK <= 32|
+ +----------------------------------------------------------------+
+
+ (#) After reset, the System clock source is the MSI (2 MHz) with 0 WS,
+ Flash 32-bit access is enabled and prefetch is disabled.
+ [..] It is recommended to use the following software sequences to tune the
+ number of wait states needed to access the Flash memory with the CPU
+ frequency (HCLK).
+ (+) Increasing the CPU frequency (in the same voltage range)
+ (+) Program the Flash 64-bit access, using "FLASH_ReadAccess64Cmd(ENABLE)"
+ function
+ (+) Check that 64-bit access is taken into account by reading FLASH_ACR
+ (+) Program Flash WS to 1, using "FLASH_SetLatency(FLASH_Latency_1)"
+ function
+ (+) Check that the new number of WS is taken into account by reading
+ FLASH_ACR
+ (+) Modify the CPU clock source, using "RCC_SYSCLKConfig()" function
+ (+) If needed, modify the CPU clock prescaler by using "RCC_HCLKConfig()"
+ function
+ (+) Check that the new CPU clock source is taken into account by reading
+ the clock source status, using "RCC_GetSYSCLKSource()" function
+ (+) Decreasing the CPU frequency (in the same voltage range)
+ (+) Modify the CPU clock source, using "RCC_SYSCLKConfig()" function
+ (+) If needed, modify the CPU clock prescaler by using "RCC_HCLKConfig()"
+ function
+ (+) Check that the new CPU clock source is taken into account by reading
+ the clock source status, using "RCC_GetSYSCLKSource()" function
+ (+) Program the new number of WS, using "FLASH_SetLatency()" function
+ (+) Check that the new number of WS is taken into account by reading
+ FLASH_ACR
+ (+) Enable the Flash 32-bit access, using "FLASH_ReadAccess64Cmd(DISABLE)"
+ function
+ (+) Check that 32-bit access is taken into account by reading FLASH_ACR
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Configures the system clock (SYSCLK).
+ * @note The MSI is used (enabled by hardware) as system clock source after
+ * startup from Reset, wake-up from STOP and STANDBY mode, or in case
+ * of failure of the HSE used directly or indirectly as system clock
+ * (if the Clock Security System CSS is enabled).
+ * @note A switch from one clock source to another occurs only if the target
+ * clock source is ready (clock stable after startup delay or PLL locked).
+ * If a clock source which is not yet ready is selected, the switch will
+ * occur when the clock source will be ready.
+ * You can use RCC_GetSYSCLKSource() function to know which clock is
+ * currently used as system clock source.
+ * @param RCC_SYSCLKSource: specifies the clock source used as system clock source
+ * This parameter can be one of the following values:
+ * @arg RCC_SYSCLKSource_MSI: MSI selected as system clock source
+ * @arg RCC_SYSCLKSource_HSI: HSI selected as system clock source
+ * @arg RCC_SYSCLKSource_HSE: HSE selected as system clock source
+ * @arg RCC_SYSCLKSource_PLLCLK: PLL selected as system clock source
+ * @retval None
+ */
+void RCC_SYSCLKConfig(uint32_t RCC_SYSCLKSource)
+{
+ uint32_t tmpreg = 0;
+
+ /* Check the parameters */
+ assert_param(IS_RCC_SYSCLK_SOURCE(RCC_SYSCLKSource));
+
+ tmpreg = RCC->CFGR;
+
+ /* Clear SW[1:0] bits */
+ tmpreg &= ~RCC_CFGR_SW;
+
+ /* Set SW[1:0] bits according to RCC_SYSCLKSource value */
+ tmpreg |= RCC_SYSCLKSource;
+
+ /* Store the new value */
+ RCC->CFGR = tmpreg;
+}
+
+/**
+ * @brief Returns the clock source used as system clock.
+ * @param None
+ * @retval The clock source used as system clock. The returned value can be one
+ * of the following values:
+ * - 0x00: MSI used as system clock
+ * - 0x04: HSI used as system clock
+ * - 0x08: HSE used as system clock
+ * - 0x0C: PLL used as system clock
+ */
+uint8_t RCC_GetSYSCLKSource(void)
+{
+ return ((uint8_t)(RCC->CFGR & RCC_CFGR_SWS));
+}
+
+/**
+ * @brief Configures the AHB clock (HCLK).
+ * @note Depending on the device voltage range, the software has to set correctly
+ * these bits to ensure that the system frequency does not exceed the
+ * maximum allowed frequency (for more details refer to section above
+ * "CPU, AHB and APB busses clocks configuration functions")
+ * @param RCC_SYSCLK: defines the AHB clock divider. This clock is derived from
+ * the system clock (SYSCLK).
+ * This parameter can be one of the following values:
+ * @arg RCC_SYSCLK_Div1: AHB clock = SYSCLK
+ * @arg RCC_SYSCLK_Div2: AHB clock = SYSCLK/2
+ * @arg RCC_SYSCLK_Div4: AHB clock = SYSCLK/4
+ * @arg RCC_SYSCLK_Div8: AHB clock = SYSCLK/8
+ * @arg RCC_SYSCLK_Div16: AHB clock = SYSCLK/16
+ * @arg RCC_SYSCLK_Div64: AHB clock = SYSCLK/64
+ * @arg RCC_SYSCLK_Div128: AHB clock = SYSCLK/128
+ * @arg RCC_SYSCLK_Div256: AHB clock = SYSCLK/256
+ * @arg RCC_SYSCLK_Div512: AHB clock = SYSCLK/512
+ * @retval None
+ */
+void RCC_HCLKConfig(uint32_t RCC_SYSCLK)
+{
+ uint32_t tmpreg = 0;
+
+ /* Check the parameters */
+ assert_param(IS_RCC_HCLK(RCC_SYSCLK));
+
+ tmpreg = RCC->CFGR;
+
+ /* Clear HPRE[3:0] bits */
+ tmpreg &= ~RCC_CFGR_HPRE;
+
+ /* Set HPRE[3:0] bits according to RCC_SYSCLK value */
+ tmpreg |= RCC_SYSCLK;
+
+ /* Store the new value */
+ RCC->CFGR = tmpreg;
+}
+
+/**
+ * @brief Configures the Low Speed APB clock (PCLK1).
+ * @param RCC_HCLK: defines the APB1 clock divider. This clock is derived from
+ * the AHB clock (HCLK).
+ * This parameter can be one of the following values:
+ * @arg RCC_HCLK_Div1: APB1 clock = HCLK
+ * @arg RCC_HCLK_Div2: APB1 clock = HCLK/2
+ * @arg RCC_HCLK_Div4: APB1 clock = HCLK/4
+ * @arg RCC_HCLK_Div8: APB1 clock = HCLK/8
+ * @arg RCC_HCLK_Div16: APB1 clock = HCLK/16
+ * @retval None
+ */
+void RCC_PCLK1Config(uint32_t RCC_HCLK)
+{
+ uint32_t tmpreg = 0;
+
+ /* Check the parameters */
+ assert_param(IS_RCC_PCLK(RCC_HCLK));
+
+ tmpreg = RCC->CFGR;
+
+ /* Clear PPRE1[2:0] bits */
+ tmpreg &= ~RCC_CFGR_PPRE1;
+
+ /* Set PPRE1[2:0] bits according to RCC_HCLK value */
+ tmpreg |= RCC_HCLK;
+
+ /* Store the new value */
+ RCC->CFGR = tmpreg;
+}
+
+/**
+ * @brief Configures the High Speed APB clock (PCLK2).
+ * @param RCC_HCLK: defines the APB2 clock divider. This clock is derived from
+ * the AHB clock (HCLK).
+ * This parameter can be one of the following values:
+ * @arg RCC_HCLK_Div1: APB2 clock = HCLK
+ * @arg RCC_HCLK_Div2: APB2 clock = HCLK/2
+ * @arg RCC_HCLK_Div4: APB2 clock = HCLK/4
+ * @arg RCC_HCLK_Div8: APB2 clock = HCLK/8
+ * @arg RCC_HCLK_Div16: APB2 clock = HCLK/16
+ * @retval None
+ */
+void RCC_PCLK2Config(uint32_t RCC_HCLK)
+{
+ uint32_t tmpreg = 0;
+
+ /* Check the parameters */
+ assert_param(IS_RCC_PCLK(RCC_HCLK));
+
+ tmpreg = RCC->CFGR;
+
+ /* Clear PPRE2[2:0] bits */
+ tmpreg &= ~RCC_CFGR_PPRE2;
+
+ /* Set PPRE2[2:0] bits according to RCC_HCLK value */
+ tmpreg |= RCC_HCLK << 3;
+
+ /* Store the new value */
+ RCC->CFGR = tmpreg;
+}
+
+/**
+ * @brief Returns the frequencies of the System, AHB and APB busses clocks.
+ * @note The frequency returned by this function is not the real frequency
+ * in the chip. It is calculated based on the predefined constant and
+ * the source selected by RCC_SYSCLKConfig():
+ *
+ * @note If SYSCLK source is MSI, function returns values based on MSI
+ * Value as defined by the MSI range, refer to RCC_MSIRangeConfig()
+ *
+ * @note If SYSCLK source is HSI, function returns values based on HSI_VALUE(*)
+ *
+ * @note If SYSCLK source is HSE, function returns values based on HSE_VALUE(**)
+ *
+ * @note If SYSCLK source is PLL, function returns values based on HSE_VALUE(**)
+ * or HSI_VALUE(*) multiplied/divided by the PLL factors.
+ *
+ * (*) HSI_VALUE is a constant defined in stm32l1xx.h file (default value
+ * 16 MHz) but the real value may vary depending on the variations
+ * in voltage and temperature, refer to RCC_AdjustHSICalibrationValue().
+ *
+ * (**) HSE_VALUE is a constant defined in stm32l1xx.h file (default value
+ * 8 MHz), user has to ensure that HSE_VALUE is same as the real
+ * frequency of the crystal used. Otherwise, this function may
+ * return wrong result.
+ *
+ * - The result of this function could be not correct when using fractional
+ * value for HSE crystal.
+ *
+ * @param RCC_Clocks: pointer to a RCC_ClocksTypeDef structure which will hold
+ * the clocks frequencies.
+ *
+ * @note This function can be used by the user application to compute the
+ * baudrate for the communication peripherals or configure other parameters.
+ * @note Each time SYSCLK, HCLK, PCLK1 and/or PCLK2 clock changes, this function
+ * must be called to update the structure's field. Otherwise, any
+ * configuration based on this function will be incorrect.
+ *
+ * @retval None
+ */
+void RCC_GetClocksFreq(RCC_ClocksTypeDef* RCC_Clocks)
+{
+ uint32_t tmp = 0, pllmul = 0, plldiv = 0, pllsource = 0, presc = 0, msirange = 0;
+
+ /* Get SYSCLK source -------------------------------------------------------*/
+ tmp = RCC->CFGR & RCC_CFGR_SWS;
+
+ switch (tmp)
+ {
+ case 0x00: /* MSI used as system clock */
+ msirange = (RCC->ICSCR & RCC_ICSCR_MSIRANGE ) >> 13;
+ RCC_Clocks->SYSCLK_Frequency = (32768 * (1 << (msirange + 1)));
+ break;
+ case 0x04: /* HSI used as system clock */
+ RCC_Clocks->SYSCLK_Frequency = HSI_VALUE;
+ break;
+ case 0x08: /* HSE used as system clock */
+ RCC_Clocks->SYSCLK_Frequency = HSE_VALUE;
+ break;
+ case 0x0C: /* PLL used as system clock */
+ /* Get PLL clock source and multiplication factor ----------------------*/
+ pllmul = RCC->CFGR & RCC_CFGR_PLLMUL;
+ plldiv = RCC->CFGR & RCC_CFGR_PLLDIV;
+ pllmul = PLLMulTable[(pllmul >> 18)];
+ plldiv = (plldiv >> 22) + 1;
+
+ pllsource = RCC->CFGR & RCC_CFGR_PLLSRC;
+
+ if (pllsource == 0x00)
+ {
+ /* HSI oscillator clock selected as PLL clock source */
+ RCC_Clocks->SYSCLK_Frequency = (((HSI_VALUE) * pllmul) / plldiv);
+ }
+ else
+ {
+ /* HSE selected as PLL clock source */
+ RCC_Clocks->SYSCLK_Frequency = (((HSE_VALUE) * pllmul) / plldiv);
+ }
+ break;
+ default: /* MSI used as system clock */
+ msirange = (RCC->ICSCR & RCC_ICSCR_MSIRANGE ) >> 13;
+ RCC_Clocks->SYSCLK_Frequency = (32768 * (1 << (msirange + 1)));
+ break;
+ }
+ /* Compute HCLK, PCLK1, PCLK2 and ADCCLK clocks frequencies ----------------*/
+ /* Get HCLK prescaler */
+ tmp = RCC->CFGR & RCC_CFGR_HPRE;
+ tmp = tmp >> 4;
+ presc = APBAHBPrescTable[tmp];
+ /* HCLK clock frequency */
+ RCC_Clocks->HCLK_Frequency = RCC_Clocks->SYSCLK_Frequency >> presc;
+
+ /* Get PCLK1 prescaler */
+ tmp = RCC->CFGR & RCC_CFGR_PPRE1;
+ tmp = tmp >> 8;
+ presc = APBAHBPrescTable[tmp];
+ /* PCLK1 clock frequency */
+ RCC_Clocks->PCLK1_Frequency = RCC_Clocks->HCLK_Frequency >> presc;
+
+ /* Get PCLK2 prescaler */
+ tmp = RCC->CFGR & RCC_CFGR_PPRE2;
+ tmp = tmp >> 11;
+ presc = APBAHBPrescTable[tmp];
+ /* PCLK2 clock frequency */
+ RCC_Clocks->PCLK2_Frequency = RCC_Clocks->HCLK_Frequency >> presc;
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup RCC_Group3 Peripheral clocks configuration functions
+ * @brief Peripheral clocks configuration functions
+ *
+@verbatim
+ ===============================================================================
+ ##### Peripheral clocks configuration functions #####
+ ===============================================================================
+ [..] This section provide functions allowing to configure the Peripheral clocks.
+ (#) The RTC/LCD clock which is derived from the LSE, LSI or 1 MHz HSE_RTC
+ (HSE divided by a programmable prescaler).
+ (#) After restart from Reset or wakeup from STANDBY, all peripherals are
+ off except internal SRAM, Flash and JTAG. Before to start using a
+ peripheral you have to enable its interface clock. You can do this
+ using RCC_AHBPeriphClockCmd(), RCC_APB2PeriphClockCmd() and
+ RCC_APB1PeriphClockCmd() functions.
+
+ (#) To reset the peripherals configuration (to the default state after
+ device reset) you can use RCC_AHBPeriphResetCmd(),
+ RCC_APB2PeriphResetCmd() and RCC_APB1PeriphResetCmd() functions.
+ (#) To further reduce power consumption in SLEEP mode the peripheral
+ clocks can be disabled prior to executing the WFI or WFE instructions.
+ You can do this using RCC_AHBPeriphClockLPModeCmd(),
+ RCC_APB2PeriphClockLPModeCmd() and RCC_APB1PeriphClockLPModeCmd()
+ functions.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Configures the RTC and LCD clock (RTCCLK / LCDCLK).
+ * @note As the RTC clock configuration bits are in the RTC domain and write
+ * access is denied to this domain after reset, you have to enable write
+ * access using PWR_RTCAccessCmd(ENABLE) function before to configure
+ * the RTC clock source (to be done once after reset).
+ * @note Once the RTC clock is configured it can't be changed unless the RTC
+ * is reset using RCC_RTCResetCmd function, or by a Power On Reset (POR)
+ * @note The RTC clock (RTCCLK) is used also to clock the LCD (LCDCLK).
+ *
+ * @param RCC_RTCCLKSource: specifies the RTC clock source.
+ * This parameter can be one of the following values:
+ * @arg RCC_RTCCLKSource_LSE: LSE selected as RTC clock
+ * @arg RCC_RTCCLKSource_LSI: LSI selected as RTC clock
+ * @arg RCC_RTCCLKSource_HSE_Div2: HSE divided by 2 selected as RTC clock
+ * @arg RCC_RTCCLKSource_HSE_Div4: HSE divided by 4 selected as RTC clock
+ * @arg RCC_RTCCLKSource_HSE_Div8: HSE divided by 8 selected as RTC clock
+ * @arg RCC_RTCCLKSource_HSE_Div16: HSE divided by 16 selected as RTC clock
+ *
+ * @note If the LSE or LSI is used as RTC clock source, the RTC continues to
+ * work in STOP and STANDBY modes, and can be used as wakeup source.
+ * However, when the HSE clock is used as RTC clock source, the RTC
+ * cannot be used in STOP and STANDBY modes.
+ *
+ * @note The maximum input clock frequency for RTC is 1MHz (when using HSE as
+ * RTC clock source).
+ *
+ * @retval None
+ */
+void RCC_RTCCLKConfig(uint32_t RCC_RTCCLKSource)
+{
+ uint32_t tmpreg = 0;
+
+ /* Check the parameters */
+ assert_param(IS_RCC_RTCCLK_SOURCE(RCC_RTCCLKSource));
+
+ if ((RCC_RTCCLKSource & RCC_CSR_RTCSEL_HSE) == RCC_CSR_RTCSEL_HSE)
+ {
+ /* If HSE is selected as RTC clock source, configure HSE division factor for RTC clock */
+ tmpreg = RCC->CR;
+
+ /* Clear RTCPRE[1:0] bits */
+ tmpreg &= ~RCC_CR_RTCPRE;
+
+ /* Configure HSE division factor for RTC clock */
+ tmpreg |= (RCC_RTCCLKSource & RCC_CR_RTCPRE);
+
+ /* Store the new value */
+ RCC->CR = tmpreg;
+ }
+
+ RCC->CSR &= ~RCC_CSR_RTCSEL;
+
+ /* Select the RTC clock source */
+ RCC->CSR |= (RCC_RTCCLKSource & RCC_CSR_RTCSEL);
+}
+
+/**
+ * @brief Enables or disables the RTC clock.
+ * @note This function must be used only after the RTC clock source was selected
+ * using the RCC_RTCCLKConfig function.
+ * @param NewState: new state of the RTC clock.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_RTCCLKCmd(FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ *(__IO uint32_t *) CSR_RTCEN_BB = (uint32_t)NewState;
+}
+
+/**
+ * @brief Forces or releases the RTC peripheral and associated resources reset.
+ * @note This function resets the RTC peripheral, RTC clock source selection
+ * (in RCC_CSR) and the backup registers.
+ * @param NewState: new state of the RTC reset.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_RTCResetCmd(FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ *(__IO uint32_t *) CSR_RTCRST_BB = (uint32_t)NewState;
+}
+
+/**
+ * @brief Enables or disables the AHB peripheral clock.
+ * @note After reset, the peripheral clock (used for registers read/write access)
+ * is disabled and the application software has to enable this clock before
+ * using it.
+ * @param RCC_AHBPeriph: specifies the AHB peripheral to gates its clock.
+ * This parameter can be any combination of the following values:
+ * @arg RCC_AHBPeriph_GPIOA: GPIOA clock
+ * @arg RCC_AHBPeriph_GPIOB: GPIOB clock
+ * @arg RCC_AHBPeriph_GPIOC: GPIOC clock
+ * @arg RCC_AHBPeriph_GPIOD: GPIOD clock
+ * @arg RCC_AHBPeriph_GPIOE: GPIOE clock
+ * @arg RCC_AHBPeriph_GPIOH: GPIOH clock
+ * @arg RCC_AHBPeriph_GPIOF: GPIOF clock
+ * @arg RCC_AHBPeriph_GPIOG: GPIOG clock
+ * @arg RCC_AHBPeriph_CRC: CRC clock
+ * @arg RCC_AHBPeriph_FLITF: (has effect only when the Flash memory is in power down mode)
+ * @arg RCC_AHBPeriph_DMA1: DMA1 clock
+ * @arg RCC_AHBPeriph_DMA2: DMA2 clock
+ * @arg RCC_AHBPeriph_AES: AES clock
+ * @arg RCC_AHBPeriph_FSMC: FSMC clock
+ * @param NewState: new state of the specified peripheral clock.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_AHBPeriphClockCmd(uint32_t RCC_AHBPeriph, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_AHB_PERIPH(RCC_AHBPeriph));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ RCC->AHBENR |= RCC_AHBPeriph;
+ }
+ else
+ {
+ RCC->AHBENR &= ~RCC_AHBPeriph;
+ }
+}
+
+/**
+ * @brief Enables or disables the High Speed APB (APB2) peripheral clock.
+ * @note After reset, the peripheral clock (used for registers read/write access)
+ * is disabled and the application software has to enable this clock before
+ * using it.
+ * @param RCC_APB2Periph: specifies the APB2 peripheral to gates its clock.
+ * This parameter can be any combination of the following values:
+ * @arg RCC_APB2Periph_SYSCFG: SYSCFG APB2 Clock.
+ * @arg RCC_APB2Periph_TIM9: TIM9 APB2 Clock.
+ * @arg RCC_APB2Periph_TIM10: TIM10 APB2 Clock.
+ * @arg RCC_APB2Periph_TIM11: TIM11 APB2 Clock.
+ * @arg RCC_APB2Periph_ADC1: ADC1 APB2 Clock.
+ * @arg RCC_APB2Periph_SDIO: SDIO APB2 Clock.
+ * @arg RCC_APB2Periph_SPI1: SPI1 APB2 Clock.
+ * @arg RCC_APB2Periph_USART1: USART1 APB2 Clock.
+ * @param NewState: new state of the specified peripheral clock.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_APB2PeriphClockCmd(uint32_t RCC_APB2Periph, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_APB2_PERIPH(RCC_APB2Periph));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ RCC->APB2ENR |= RCC_APB2Periph;
+ }
+ else
+ {
+ RCC->APB2ENR &= ~RCC_APB2Periph;
+ }
+}
+
+/**
+ * @brief Enables or disables the Low Speed APB (APB1) peripheral clock.
+ * @note After reset, the peripheral clock (used for registers read/write access)
+ * is disabled and the application software has to enable this clock before
+ * using it.
+ * @param RCC_APB1Periph: specifies the APB1 peripheral to gates its clock.
+ * This parameter can be any combination of the following values:
+ * @arg RCC_APB1Periph_TIM2: TIM2 clock
+ * @arg RCC_APB1Periph_TIM3: TIM3 clock
+ * @arg RCC_APB1Periph_TIM4: TIM4 clock
+ * @arg RCC_APB1Periph_TIM5: TIM5 clock
+ * @arg RCC_APB1Periph_TIM6: TIM6 clock
+ * @arg RCC_APB1Periph_TIM7: TIM7 clock
+ * @arg RCC_APB1Periph_LCD: LCD clock
+ * @arg RCC_APB1Periph_WWDG: WWDG clock
+ * @arg RCC_APB1Periph_SPI2: SPI2 clock
+ * @arg RCC_APB1Periph_SPI3: SPI3 clock
+ * @arg RCC_APB1Periph_USART2: USART2 clock
+ * @arg RCC_APB1Periph_USART3: USART3 clock
+ * @arg RCC_APB1Periph_UART4: UART4 clock
+ * @arg RCC_APB1Periph_UART5: UART5 clock
+ * @arg RCC_APB1Periph_I2C1: I2C1 clock
+ * @arg RCC_APB1Periph_I2C2: I2C2 clock
+ * @arg RCC_APB1Periph_USB: USB clock
+ * @arg RCC_APB1Periph_PWR: PWR clock
+ * @arg RCC_APB1Periph_DAC: DAC clock
+ * @arg RCC_APB1Periph_COMP COMP clock
+ * @param NewState: new state of the specified peripheral clock.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_APB1PeriphClockCmd(uint32_t RCC_APB1Periph, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_APB1_PERIPH(RCC_APB1Periph));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ RCC->APB1ENR |= RCC_APB1Periph;
+ }
+ else
+ {
+ RCC->APB1ENR &= ~RCC_APB1Periph;
+ }
+}
+
+/**
+ * @brief Forces or releases AHB peripheral reset.
+ * @param RCC_AHBPeriph: specifies the AHB peripheral to reset.
+ * This parameter can be any combination of the following values:
+ * @arg RCC_AHBPeriph_GPIOA: GPIOA clock
+ * @arg RCC_AHBPeriph_GPIOB: GPIOB clock
+ * @arg RCC_AHBPeriph_GPIOC: GPIOC clock
+ * @arg RCC_AHBPeriph_GPIOD: GPIOD clock
+ * @arg RCC_AHBPeriph_GPIOE: GPIOE clock
+ * @arg RCC_AHBPeriph_GPIOH: GPIOH clock
+ * @arg RCC_AHBPeriph_GPIOF: GPIOF clock
+ * @arg RCC_AHBPeriph_GPIOG: GPIOG clock
+ * @arg RCC_AHBPeriph_CRC: CRC clock
+ * @arg RCC_AHBPeriph_FLITF: (has effect only when the Flash memory is in power down mode)
+ * @arg RCC_AHBPeriph_DMA1: DMA1 clock
+ * @arg RCC_AHBPeriph_DMA2: DMA2 clock
+ * @arg RCC_AHBPeriph_AES: AES clock
+ * @arg RCC_AHBPeriph_FSMC: FSMC clock
+ * @param NewState: new state of the specified peripheral reset.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_AHBPeriphResetCmd(uint32_t RCC_AHBPeriph, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_AHB_PERIPH(RCC_AHBPeriph));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ RCC->AHBRSTR |= RCC_AHBPeriph;
+ }
+ else
+ {
+ RCC->AHBRSTR &= ~RCC_AHBPeriph;
+ }
+}
+
+/**
+ * @brief Forces or releases High Speed APB (APB2) peripheral reset.
+ * @param RCC_APB2Periph: specifies the APB2 peripheral to reset.
+ * This parameter can be any combination of the following values:
+ * @arg RCC_APB2Periph_SYSCFG: SYSCFG clock
+ * @arg RCC_APB2Periph_TIM9: TIM9 clock
+ * @arg RCC_APB2Periph_TIM10: TIM10 clock
+ * @arg RCC_APB2Periph_TIM11: TIM11 clock
+ * @arg RCC_APB2Periph_ADC1: ADC1 clock
+ * @arg RCC_APB2Periph_SDIO: SDIO clock
+ * @arg RCC_APB2Periph_SPI1: SPI1 clock
+ * @arg RCC_APB2Periph_USART1: USART1 clock
+ * @param NewState: new state of the specified peripheral reset.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_APB2PeriphResetCmd(uint32_t RCC_APB2Periph, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_APB2_PERIPH(RCC_APB2Periph));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ RCC->APB2RSTR |= RCC_APB2Periph;
+ }
+ else
+ {
+ RCC->APB2RSTR &= ~RCC_APB2Periph;
+ }
+}
+
+/**
+ * @brief Forces or releases Low Speed APB (APB1) peripheral reset.
+ * @param RCC_APB1Periph: specifies the APB1 peripheral to reset.
+ * This parameter can be any combination of the following values:
+ * @arg RCC_APB1Periph_TIM2: TIM2 clock
+ * @arg RCC_APB1Periph_TIM3: TIM3 clock
+ * @arg RCC_APB1Periph_TIM4: TIM4 clock
+ * @arg RCC_APB1Periph_TIM5: TIM5 clock
+ * @arg RCC_APB1Periph_TIM6: TIM6 clock
+ * @arg RCC_APB1Periph_TIM7: TIM7 clock
+ * @arg RCC_APB1Periph_LCD: LCD clock
+ * @arg RCC_APB1Periph_WWDG: WWDG clock
+ * @arg RCC_APB1Periph_SPI2: SPI2 clock
+ * @arg RCC_APB1Periph_SPI3: SPI3 clock
+ * @arg RCC_APB1Periph_USART2: USART2 clock
+ * @arg RCC_APB1Periph_USART3: USART3 clock
+ * @arg RCC_APB1Periph_UART4: UART4 clock
+ * @arg RCC_APB1Periph_UART5: UART5 clock
+ * @arg RCC_APB1Periph_I2C1: I2C1 clock
+ * @arg RCC_APB1Periph_I2C2: I2C2 clock
+ * @arg RCC_APB1Periph_USB: USB clock
+ * @arg RCC_APB1Periph_PWR: PWR clock
+ * @arg RCC_APB1Periph_DAC: DAC clock
+ * @arg RCC_APB1Periph_COMP
+ * @param NewState: new state of the specified peripheral clock.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_APB1PeriphResetCmd(uint32_t RCC_APB1Periph, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_APB1_PERIPH(RCC_APB1Periph));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ RCC->APB1RSTR |= RCC_APB1Periph;
+ }
+ else
+ {
+ RCC->APB1RSTR &= ~RCC_APB1Periph;
+ }
+}
+
+/**
+ * @brief Enables or disables the AHB peripheral clock during SLEEP mode.
+ * @note Peripheral clock gating in SLEEP mode can be used to further reduce
+ * power consumption.
+ * - After wakeup from SLEEP mode, the peripheral clock is enabled again.
+ * - By default, all peripheral clocks are enabled during SLEEP mode.
+ * @param RCC_AHBPeriph: specifies the AHB peripheral to gates its clock.
+ * This parameter can be any combination of the following values:
+ * @arg RCC_AHBPeriph_GPIOA: GPIOA clock
+ * @arg RCC_AHBPeriph_GPIOB: GPIOB clock
+ * @arg RCC_AHBPeriph_GPIOC: GPIOC clock
+ * @arg RCC_AHBPeriph_GPIOD: GPIOD clock
+ * @arg RCC_AHBPeriph_GPIOE: GPIOE clock
+ * @arg RCC_AHBPeriph_GPIOH: GPIOH clock
+ * @arg RCC_AHBPeriph_GPIOF: GPIOF clock
+ * @arg RCC_AHBPeriph_GPIOG: GPIOG clock
+ * @arg RCC_AHBPeriph_CRC: CRC clock
+ * @arg RCC_AHBPeriph_FLITF: (has effect only when the Flash memory is in power down mode)
+ * @arg RCC_AHBPeriph_SRAM: SRAM clock
+ * @arg RCC_AHBPeriph_DMA1: DMA1 clock
+ * @arg RCC_AHBPeriph_DMA2: DMA2 clock
+ * @arg RCC_AHBPeriph_AES: AES clock
+ * @arg RCC_AHBPeriph_FSMC: FSMC clock
+ * @param NewState: new state of the specified peripheral clock.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_AHBPeriphClockLPModeCmd(uint32_t RCC_AHBPeriph, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_AHB_LPMODE_PERIPH(RCC_AHBPeriph));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ RCC->AHBLPENR |= RCC_AHBPeriph;
+ }
+ else
+ {
+ RCC->AHBLPENR &= ~RCC_AHBPeriph;
+ }
+}
+
+/**
+ * @brief Enables or disables the APB2 peripheral clock during SLEEP mode.
+ * @note Peripheral clock gating in SLEEP mode can be used to further reduce
+ * power consumption.
+ * @note After wakeup from SLEEP mode, the peripheral clock is enabled again.
+ * @note By default, all peripheral clocks are enabled during SLEEP mode.
+ * @param RCC_APB2Periph: specifies the APB2 peripheral to gates its clock.
+ * This parameter can be any combination of the following values:
+ * @arg RCC_APB2Periph_SYSCFG: SYSCFG clock
+ * @arg RCC_APB2Periph_TIM9: TIM9 clock
+ * @arg RCC_APB2Periph_TIM10: TIM10 clock
+ * @arg RCC_APB2Periph_TIM11: TIM11 clock
+ * @arg RCC_APB2Periph_ADC1: ADC1 clock
+ * @arg RCC_APB2Periph_SDIO: SDIO clock
+ * @arg RCC_APB2Periph_SPI1: SPI1 clock
+ * @arg RCC_APB2Periph_USART1: USART1 clock
+ * @param NewState: new state of the specified peripheral clock.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_APB2PeriphClockLPModeCmd(uint32_t RCC_APB2Periph, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_APB2_PERIPH(RCC_APB2Periph));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ RCC->APB2LPENR |= RCC_APB2Periph;
+ }
+ else
+ {
+ RCC->APB2LPENR &= ~RCC_APB2Periph;
+ }
+}
+
+/**
+ * @brief Enables or disables the APB1 peripheral clock during SLEEP mode.
+ * @note Peripheral clock gating in SLEEP mode can be used to further reduce
+ * power consumption.
+ * @note After wakeup from SLEEP mode, the peripheral clock is enabled again.
+ * @note By default, all peripheral clocks are enabled during SLEEP mode.
+ * @param RCC_APB1Periph: specifies the APB1 peripheral to gates its clock.
+ * This parameter can be any combination of the following values:
+ * @arg RCC_APB1Periph_TIM2: TIM2 clock
+ * @arg RCC_APB1Periph_TIM3: TIM3 clock
+ * @arg RCC_APB1Periph_TIM4: TIM4 clock
+ * @arg RCC_APB1Periph_TIM5: TIM5 clock
+ * @arg RCC_APB1Periph_TIM6: TIM6 clock
+ * @arg RCC_APB1Periph_TIM7: TIM7 clock
+ * @arg RCC_APB1Periph_LCD: LCD clock
+ * @arg RCC_APB1Periph_WWDG: WWDG clock
+ * @arg RCC_APB1Periph_SPI2: SPI2 clock
+ * @arg RCC_APB1Periph_SPI3: SPI3 clock
+ * @arg RCC_APB1Periph_USART2: USART2 clock
+ * @arg RCC_APB1Periph_USART3: USART3 clock
+ * @arg RCC_APB1Periph_UART4: UART4 clock
+ * @arg RCC_APB1Periph_UART5: UART5 clock
+ * @arg RCC_APB1Periph_I2C1: I2C1 clock
+ * @arg RCC_APB1Periph_I2C2: I2C2 clock
+ * @arg RCC_APB1Periph_USB: USB clock
+ * @arg RCC_APB1Periph_PWR: PWR clock
+ * @arg RCC_APB1Periph_DAC: DAC clock
+ * @arg RCC_APB1Periph_COMP: COMP clock
+ * @param NewState: new state
+ * @param NewState: new state of the specified peripheral clock.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_APB1PeriphClockLPModeCmd(uint32_t RCC_APB1Periph, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_APB1_PERIPH(RCC_APB1Periph));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ RCC->APB1LPENR |= RCC_APB1Periph;
+ }
+ else
+ {
+ RCC->APB1LPENR &= ~RCC_APB1Periph;
+ }
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup RCC_Group4 Interrupts and flags management functions
+ * @brief Interrupts and flags management functions
+ *
+@verbatim
+ ===============================================================================
+ ##### Interrupts and flags management functions #####
+ ===============================================================================
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Enables or disables the specified RCC interrupts.
+ * @note The CSS interrupt doesn't have an enable bit; once the CSS is enabled
+ * and if the HSE clock fails, the CSS interrupt occurs and an NMI is
+ * automatically generated. The NMI will be executed indefinitely, and
+ * since NMI has higher priority than any other IRQ (and main program)
+ * the application will be stacked in the NMI ISR unless the CSS interrupt
+ * pending bit is cleared.
+ * @param RCC_IT: specifies the RCC interrupt sources to be enabled or disabled.
+ * This parameter can be any combination of the following values:
+ * @arg RCC_IT_LSIRDY: LSI ready interrupt
+ * @arg RCC_IT_LSERDY: LSE ready interrupt
+ * @arg RCC_IT_HSIRDY: HSI ready interrupt
+ * @arg RCC_IT_HSERDY: HSE ready interrupt
+ * @arg RCC_IT_PLLRDY: PLL ready interrupt
+ * @arg RCC_IT_MSIRDY: MSI ready interrupt
+ * @arg RCC_IT_LSECSS: LSE CSS interrupt
+ * @param NewState: new state of the specified RCC interrupts.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void RCC_ITConfig(uint8_t RCC_IT, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_IT(RCC_IT));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Perform Byte access to RCC_CIR[12:8] bits to enable the selected interrupts */
+ *(__IO uint8_t *) CIR_BYTE2_ADDRESS |= RCC_IT;
+ }
+ else
+ {
+ /* Perform Byte access to RCC_CIR[12:8] bits to disable the selected interrupts */
+ *(__IO uint8_t *) CIR_BYTE2_ADDRESS &= (uint8_t)~RCC_IT;
+ }
+}
+
+/**
+ * @brief Checks whether the specified RCC flag is set or not.
+ * @param RCC_FLAG: specifies the flag to check.
+ * This parameter can be one of the following values:
+ * @arg RCC_FLAG_HSIRDY: HSI oscillator clock ready
+ * @arg RCC_FLAG_MSIRDY: MSI oscillator clock ready
+ * @arg RCC_FLAG_HSERDY: HSE oscillator clock ready
+ * @arg RCC_FLAG_PLLRDY: PLL clock ready
+ * @arg RCC_FLAG_LSECSS: LSE oscillator clock CSS detected
+ * @arg RCC_FLAG_LSERDY: LSE oscillator clock ready
+ * @arg RCC_FLAG_LSIRDY: LSI oscillator clock ready
+ * @arg RCC_FLAG_OBLRST: Option Byte Loader (OBL) reset
+ * @arg RCC_FLAG_PINRST: Pin reset
+ * @arg RCC_FLAG_PORRST: POR/PDR reset
+ * @arg RCC_FLAG_SFTRST: Software reset
+ * @arg RCC_FLAG_IWDGRST: Independent Watchdog reset
+ * @arg RCC_FLAG_WWDGRST: Window Watchdog reset
+ * @arg RCC_FLAG_LPWRRST: Low Power reset
+ * @retval The new state of RCC_FLAG (SET or RESET).
+ */
+FlagStatus RCC_GetFlagStatus(uint8_t RCC_FLAG)
+{
+ uint32_t tmp = 0;
+ uint32_t statusreg = 0;
+ FlagStatus bitstatus = RESET;
+
+ /* Check the parameters */
+ assert_param(IS_RCC_FLAG(RCC_FLAG));
+
+ /* Get the RCC register index */
+ tmp = RCC_FLAG >> 5;
+
+ if (tmp == 1) /* The flag to check is in CR register */
+ {
+ statusreg = RCC->CR;
+ }
+ else /* The flag to check is in CSR register (tmp == 2) */
+ {
+ statusreg = RCC->CSR;
+ }
+
+ /* Get the flag position */
+ tmp = RCC_FLAG & FLAG_MASK;
+
+ if ((statusreg & ((uint32_t)1 << tmp)) != (uint32_t)RESET)
+ {
+ bitstatus = SET;
+ }
+ else
+ {
+ bitstatus = RESET;
+ }
+ /* Return the flag status */
+ return bitstatus;
+}
+
+/**
+ * @brief Clears the RCC reset flags.
+ * The reset flags are: RCC_FLAG_OBLRST, RCC_FLAG_PINRST, RCC_FLAG_PORRST,
+ * RCC_FLAG_SFTRST, RCC_FLAG_IWDGRST, RCC_FLAG_WWDGRST, RCC_FLAG_LPWRRST.
+ * @param None
+ * @retval None
+ */
+void RCC_ClearFlag(void)
+{
+ /* Set RMVF bit to clear the reset flags */
+ RCC->CSR |= RCC_CSR_RMVF;
+}
+
+/**
+ * @brief Checks whether the specified RCC interrupt has occurred or not.
+ * @param RCC_IT: specifies the RCC interrupt source to check.
+ * This parameter can be one of the following values:
+ * @arg RCC_IT_LSIRDY: LSI ready interrupt
+ * @arg RCC_IT_LSERDY: LSE ready interrupt
+ * @arg RCC_IT_HSIRDY: HSI ready interrupt
+ * @arg RCC_IT_HSERDY: HSE ready interrupt
+ * @arg RCC_IT_PLLRDY: PLL ready interrupt
+ * @arg RCC_IT_MSIRDY: MSI ready interrupt
+ * @arg RCC_IT_LSECSS: LSE CSS interrupt
+ * @arg RCC_IT_CSS: Clock Security System interrupt
+ * @retval The new state of RCC_IT (SET or RESET).
+ */
+ITStatus RCC_GetITStatus(uint8_t RCC_IT)
+{
+ ITStatus bitstatus = RESET;
+ /* Check the parameters */
+ assert_param(IS_RCC_GET_IT(RCC_IT));
+
+ /* Check the status of the specified RCC interrupt */
+ if ((RCC->CIR & RCC_IT) != (uint32_t)RESET)
+ {
+ bitstatus = SET;
+ }
+ else
+ {
+ bitstatus = RESET;
+ }
+ /* Return the RCC_IT status */
+ return bitstatus;
+}
+
+/**
+ * @brief Clears the RCC's interrupt pending bits.
+ * @param RCC_IT: specifies the interrupt pending bit to clear.
+ * This parameter can be any combination of the following values:
+ * @arg RCC_IT_LSIRDY: LSI ready interrupt
+ * @arg RCC_IT_LSERDY: LSE ready interrupt
+ * @arg RCC_IT_HSIRDY: HSI ready interrupt
+ * @arg RCC_IT_HSERDY: HSE ready interrupt
+ * @arg RCC_IT_PLLRDY: PLL ready interrupt
+ * @arg RCC_IT_MSIRDY: MSI ready interrupt
+ * @arg RCC_IT_LSECSS: LSE CSS interrupt
+ * @arg RCC_IT_CSS: Clock Security System interrupt
+ * @retval None
+ */
+void RCC_ClearITPendingBit(uint8_t RCC_IT)
+{
+ /* Check the parameters */
+ assert_param(IS_RCC_CLEAR_IT(RCC_IT));
+
+ /* Perform Byte access to RCC_CIR[23:16] bits to clear the selected interrupt
+ pending bits */
+ *(__IO uint8_t *) CIR_BYTE3_ADDRESS = RCC_IT;
+}
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/