mbed library sources
Dependents: Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more
Superseded
This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.
Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.
If you are looking for a stable and tested release, please import one of the official mbed library releases:
Import librarymbed
The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.
targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/serial_api.c
- Committer:
- mbed_official
- Date:
- 2013-12-02
- Revision:
- 52:a51c77007319
- Child:
- 55:3b765ca737a5
File content as of revision 52:a51c77007319:
/* 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 void uart1_irq(void) { USART_TypeDef *usart = (USART_TypeDef *)UART_1; if (serial_irq_ids[0] != 0) { if (USART_GetITStatus(usart, USART_IT_TXE) != RESET) { irq_handler(serial_irq_ids[0], TxIrq); } if (USART_GetITStatus(usart, USART_IT_RXNE) != RESET) { irq_handler(serial_irq_ids[0], RxIrq); } } } // not api void uart2_irq(void) { USART_TypeDef *usart = (USART_TypeDef *)UART_2; if (serial_irq_ids[1] != 0) { if (USART_GetITStatus(usart, USART_IT_TXE) != RESET) { irq_handler(serial_irq_ids[1], TxIrq); } if (USART_GetITStatus(usart, USART_IT_RXNE) != RESET) { irq_handler(serial_irq_ids[1], RxIrq); } } } 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_TXE, 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) { }