mbed library with additional peripherals for ST F401 board
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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
targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/serial_api.c
- Committer:
- mbed_official
- Date:
- 2013-12-09
- Revision:
- 55:3b765ca737a5
- Parent:
- 52:a51c77007319
- Child:
- 56:99eb381a3269
File content as of revision 55:3b765ca737a5:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 * * 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. */ //============================================================================== // STM32F103 //============================================================================== #include "serial_api.h" #include "cmsis.h" #include "pinmap.h" #include "error.h" #include <string.h> /****************************************************************************** * INITIALIZATION ******************************************************************************/ static const PinMap PinMap_UART_TX[] = { {PA_9, UART_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, {PA_2, UART_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, {NC, NC, 0} }; static const PinMap PinMap_UART_RX[] = { {PA_10, UART_1, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0)}, {PA_3, UART_2, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0)}, {NC, NC, 0} }; #define UART_NUM (2) static uint32_t serial_irq_ids[UART_NUM] = {0}; static uart_irq_handler irq_handler; int stdio_uart_inited = 0; serial_t stdio_uart; void serial_init(serial_t *obj, PinName tx, PinName rx) { USART_TypeDef *usart; USART_InitTypeDef USART_InitStructure; // Determine the UART to use (UART_1, UART_2, ...) UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX); UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX); // Get the peripheral name (UART_1, UART_2, ...) from the pin and assign it to the object obj->uart = (UARTName)pinmap_merge(uart_tx, uart_rx); if (obj->uart == (UARTName)NC) { error("Serial pinout mapping failed"); } // Get UART registers structure address usart = (USART_TypeDef *)(obj->uart); // Enable USART clock if (obj->uart == UART_1) { RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); } if (obj->uart == UART_2) { RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); } // Configure the UART pins pinmap_pinout(tx, PinMap_UART_TX); pinmap_pinout(rx, PinMap_UART_RX); // Configure UART obj->baudrate = 9600; obj->databits = USART_WordLength_8b; obj->stopbits = USART_StopBits_1; obj->parity = USART_Parity_No; USART_InitStructure.USART_BaudRate = obj->baudrate; USART_InitStructure.USART_WordLength = obj->databits; USART_InitStructure.USART_StopBits = obj->stopbits; USART_InitStructure.USART_Parity = obj->parity; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_Init(usart, &USART_InitStructure); USART_Cmd(usart, ENABLE); // The index is used by irq if (obj->uart == UART_1) obj->index = 0; if (obj->uart == UART_2) obj->index = 1; // For stdio management if (obj->uart == STDIO_UART) { stdio_uart_inited = 1; memcpy(&stdio_uart, obj, sizeof(serial_t)); } } void serial_free(serial_t *obj) { serial_irq_ids[obj->index] = 0; } void serial_baud(serial_t *obj, int baudrate) { USART_TypeDef *usart = (USART_TypeDef *)(obj->uart); USART_InitTypeDef USART_InitStructure; // Save new value obj->baudrate = baudrate; USART_Cmd(usart, DISABLE); USART_InitStructure.USART_BaudRate = obj->baudrate; USART_InitStructure.USART_WordLength = obj->databits; USART_InitStructure.USART_StopBits = obj->stopbits; USART_InitStructure.USART_Parity = obj->parity; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_Init(usart, &USART_InitStructure); USART_Cmd(usart, ENABLE); } void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) { USART_TypeDef *usart = (USART_TypeDef *)(obj->uart); USART_InitTypeDef USART_InitStructure; // Save new values if (data_bits == 8) { obj->databits = USART_WordLength_8b; } else { obj->databits = USART_WordLength_9b; } switch (parity) { case ParityOdd: case ParityForced0: obj->parity = USART_Parity_Odd; break; case ParityEven: case ParityForced1: obj->parity = USART_Parity_Even; break; default: // ParityNone obj->parity = USART_Parity_No; break; } if (stop_bits == 2) { obj->stopbits = USART_StopBits_2; } else { obj->stopbits = USART_StopBits_1; } USART_Cmd(usart, DISABLE); USART_InitStructure.USART_BaudRate = obj->baudrate; USART_InitStructure.USART_WordLength = obj->databits; USART_InitStructure.USART_StopBits = obj->stopbits; USART_InitStructure.USART_Parity = obj->parity; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_Init(usart, &USART_InitStructure); USART_Cmd(usart, ENABLE); } /****************************************************************************** * INTERRUPTS HANDLING ******************************************************************************/ // not api static void uart_irq(USART_TypeDef* usart, int id) { if (serial_irq_ids[id] != 0) { if (USART_GetITStatus(usart, USART_IT_TC) != RESET) { irq_handler(serial_irq_ids[id], TxIrq); USART_ClearITPendingBit(usart, USART_IT_TC); } if (USART_GetITStatus(usart, USART_IT_RXNE) != RESET) { irq_handler(serial_irq_ids[id], RxIrq); USART_ClearITPendingBit(usart, USART_IT_RXNE); } } } static void uart1_irq(void) {uart_irq((USART_TypeDef*)UART_1, 0);} static void uart2_irq(void) {uart_irq((USART_TypeDef*)UART_2, 1);} void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) { irq_handler = handler; serial_irq_ids[obj->index] = id; } void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) { IRQn_Type irq_n = (IRQn_Type)0; uint32_t vector = 0; USART_TypeDef *usart = (USART_TypeDef *)(obj->uart); if (obj->uart == UART_1) { irq_n = USART1_IRQn; vector = (uint32_t)&uart1_irq; } if (obj->uart == UART_2) { irq_n = USART2_IRQn; vector = (uint32_t)&uart2_irq; } if (enable) { if (irq == RxIrq) { USART_ITConfig(usart, USART_IT_RXNE, ENABLE); } else { // TxIrq USART_ITConfig(usart, USART_IT_TC, ENABLE); } NVIC_SetVector(irq_n, vector); NVIC_EnableIRQ(irq_n); } else { // disable int all_disabled = 0; if (irq == RxIrq) { USART_ITConfig(usart, USART_IT_RXNE, DISABLE); // Check if TxIrq is disabled too if ((usart->CR1 & USART_CR1_TXEIE) == 0) all_disabled = 1; } else { // TxIrq USART_ITConfig(usart, USART_IT_TXE, DISABLE); // Check if RxIrq is disabled too if ((usart->CR1 & USART_CR1_RXNEIE) == 0) all_disabled = 1; } if (all_disabled) NVIC_DisableIRQ(irq_n); } } /****************************************************************************** * READ/WRITE ******************************************************************************/ int serial_getc(serial_t *obj) { USART_TypeDef *usart = (USART_TypeDef *)(obj->uart); while (!serial_readable(obj)); return (int)(USART_ReceiveData(usart)); } void serial_putc(serial_t *obj, int c) { USART_TypeDef *usart = (USART_TypeDef *)(obj->uart); while (!serial_writable(obj)); USART_SendData(usart, (uint16_t)c); } int serial_readable(serial_t *obj) { int status; USART_TypeDef *usart = (USART_TypeDef *)(obj->uart); // Check if data is received status = ((USART_GetFlagStatus(usart, USART_FLAG_RXNE) != RESET) ? 1 : 0); return status; } int serial_writable(serial_t *obj) { int status; USART_TypeDef *usart = (USART_TypeDef *)(obj->uart); // Check if data is transmitted status = ((USART_GetFlagStatus(usart, USART_FLAG_TXE) != RESET) ? 1 : 0); return status; } void serial_clear(serial_t *obj) { USART_TypeDef *usart = (USART_TypeDef *)(obj->uart); USART_ClearFlag(usart, USART_FLAG_TXE); USART_ClearFlag(usart, USART_FLAG_RXNE); } void serial_pinout_tx(PinName tx) { pinmap_pinout(tx, PinMap_UART_TX); } void serial_break_set(serial_t *obj) { USART_TypeDef *usart = (USART_TypeDef *)(obj->uart); USART_SendBreak(usart); } void serial_break_clear(serial_t *obj) { }