Ermanno Brusadin / mbed

mbed library sources

Dependents:   FRDM-KL46Z_LCD_Test FRDM-KL46Z_LCD_Test FRDM-KL46Z_Plantilla FRDM-KL46Z_Plantilla ... more

targets/hal/TARGET_STM/TARGET_DISCO_F051R8/serial_api.c@0:6bc4ac881c8e, 2016-07-28 (annotated)

Committer:
ebrus
Date:
Thu Jul 28 15:56:34 2016 +0000
Revision:
0:6bc4ac881c8e
1;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ebrus 0:6bc4ac881c8e 1 /* mbed Microcontroller Library
ebrus 0:6bc4ac881c8e 2 *******************************************************************************
ebrus 0:6bc4ac881c8e 3 * Copyright (c) 2014, STMicroelectronics
ebrus 0:6bc4ac881c8e 4 * All rights reserved.
ebrus 0:6bc4ac881c8e 5 *
ebrus 0:6bc4ac881c8e 6 * Redistribution and use in source and binary forms, with or without
ebrus 0:6bc4ac881c8e 7 * modification, are permitted provided that the following conditions are met:
ebrus 0:6bc4ac881c8e 8 *
ebrus 0:6bc4ac881c8e 9 * 1. Redistributions of source code must retain the above copyright notice,
ebrus 0:6bc4ac881c8e 10 * this list of conditions and the following disclaimer.
ebrus 0:6bc4ac881c8e 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
ebrus 0:6bc4ac881c8e 12 * this list of conditions and the following disclaimer in the documentation
ebrus 0:6bc4ac881c8e 13 * and/or other materials provided with the distribution.
ebrus 0:6bc4ac881c8e 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
ebrus 0:6bc4ac881c8e 15 * may be used to endorse or promote products derived from this software
ebrus 0:6bc4ac881c8e 16 * without specific prior written permission.
ebrus 0:6bc4ac881c8e 17 *
ebrus 0:6bc4ac881c8e 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
ebrus 0:6bc4ac881c8e 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ebrus 0:6bc4ac881c8e 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
ebrus 0:6bc4ac881c8e 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
ebrus 0:6bc4ac881c8e 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
ebrus 0:6bc4ac881c8e 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
ebrus 0:6bc4ac881c8e 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
ebrus 0:6bc4ac881c8e 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
ebrus 0:6bc4ac881c8e 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
ebrus 0:6bc4ac881c8e 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
ebrus 0:6bc4ac881c8e 28 *******************************************************************************
ebrus 0:6bc4ac881c8e 29 */
ebrus 0:6bc4ac881c8e 30 #include "mbed_assert.h"
ebrus 0:6bc4ac881c8e 31 #include "serial_api.h"
ebrus 0:6bc4ac881c8e 32
ebrus 0:6bc4ac881c8e 33 #if DEVICE_SERIAL
ebrus 0:6bc4ac881c8e 34
ebrus 0:6bc4ac881c8e 35 #include "cmsis.h"
ebrus 0:6bc4ac881c8e 36 #include "pinmap.h"
ebrus 0:6bc4ac881c8e 37 #include <string.h>
ebrus 0:6bc4ac881c8e 38
ebrus 0:6bc4ac881c8e 39 static const PinMap PinMap_UART_TX[] = {
ebrus 0:6bc4ac881c8e 40 {PA_2, UART_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_1)},
ebrus 0:6bc4ac881c8e 41 {PA_9, UART_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_1)},
ebrus 0:6bc4ac881c8e 42 {PB_6, UART_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_0)},
ebrus 0:6bc4ac881c8e 43 {NC, NC, 0}
ebrus 0:6bc4ac881c8e 44 };
ebrus 0:6bc4ac881c8e 45
ebrus 0:6bc4ac881c8e 46 static const PinMap PinMap_UART_RX[] = {
ebrus 0:6bc4ac881c8e 47 {PA_3, UART_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_1)},
ebrus 0:6bc4ac881c8e 48 {PA_10, UART_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_1)},
ebrus 0:6bc4ac881c8e 49 {PA_15, UART_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_1)},
ebrus 0:6bc4ac881c8e 50 {PB_7, UART_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_0)},
ebrus 0:6bc4ac881c8e 51 {NC, NC, 0}
ebrus 0:6bc4ac881c8e 52 };
ebrus 0:6bc4ac881c8e 53
ebrus 0:6bc4ac881c8e 54 #define UART_NUM (2)
ebrus 0:6bc4ac881c8e 55
ebrus 0:6bc4ac881c8e 56 static uint32_t serial_irq_ids[UART_NUM] = {0};
ebrus 0:6bc4ac881c8e 57
ebrus 0:6bc4ac881c8e 58 static uart_irq_handler irq_handler;
ebrus 0:6bc4ac881c8e 59
ebrus 0:6bc4ac881c8e 60 int stdio_uart_inited = 0;
ebrus 0:6bc4ac881c8e 61 serial_t stdio_uart;
ebrus 0:6bc4ac881c8e 62
ebrus 0:6bc4ac881c8e 63 static void init_usart(serial_t *obj) {
ebrus 0:6bc4ac881c8e 64 USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
ebrus 0:6bc4ac881c8e 65 USART_InitTypeDef USART_InitStructure;
ebrus 0:6bc4ac881c8e 66
ebrus 0:6bc4ac881c8e 67 USART_Cmd(usart, DISABLE);
ebrus 0:6bc4ac881c8e 68
ebrus 0:6bc4ac881c8e 69 USART_InitStructure.USART_BaudRate = obj->baudrate;
ebrus 0:6bc4ac881c8e 70 USART_InitStructure.USART_WordLength = obj->databits;
ebrus 0:6bc4ac881c8e 71 USART_InitStructure.USART_StopBits = obj->stopbits;
ebrus 0:6bc4ac881c8e 72 USART_InitStructure.USART_Parity = obj->parity;
ebrus 0:6bc4ac881c8e 73 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
ebrus 0:6bc4ac881c8e 74 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
ebrus 0:6bc4ac881c8e 75 USART_Init(usart, &USART_InitStructure);
ebrus 0:6bc4ac881c8e 76
ebrus 0:6bc4ac881c8e 77 USART_Cmd(usart, ENABLE);
ebrus 0:6bc4ac881c8e 78 }
ebrus 0:6bc4ac881c8e 79
ebrus 0:6bc4ac881c8e 80 void serial_init(serial_t *obj, PinName tx, PinName rx) {
ebrus 0:6bc4ac881c8e 81 // Determine the UART to use (UART_1, UART_2, ...)
ebrus 0:6bc4ac881c8e 82 UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
ebrus 0:6bc4ac881c8e 83 UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
ebrus 0:6bc4ac881c8e 84
ebrus 0:6bc4ac881c8e 85 // Get the peripheral name (UART_1, UART_2, ...) from the pin and assign it to the object
ebrus 0:6bc4ac881c8e 86 obj->uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
ebrus 0:6bc4ac881c8e 87 MBED_ASSERT(obj->uart != (UARTName)NC);
ebrus 0:6bc4ac881c8e 88
ebrus 0:6bc4ac881c8e 89 // Enable USART clock
ebrus 0:6bc4ac881c8e 90 if (obj->uart == UART_1) {
ebrus 0:6bc4ac881c8e 91 RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
ebrus 0:6bc4ac881c8e 92 obj->index = 0;
ebrus 0:6bc4ac881c8e 93 }
ebrus 0:6bc4ac881c8e 94 if (obj->uart == UART_2) {
ebrus 0:6bc4ac881c8e 95 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
ebrus 0:6bc4ac881c8e 96 obj->index = 1;
ebrus 0:6bc4ac881c8e 97 }
ebrus 0:6bc4ac881c8e 98
ebrus 0:6bc4ac881c8e 99 // Configure the UART pins
ebrus 0:6bc4ac881c8e 100 pinmap_pinout(tx, PinMap_UART_TX);
ebrus 0:6bc4ac881c8e 101 pinmap_pinout(rx, PinMap_UART_RX);
ebrus 0:6bc4ac881c8e 102 pin_mode(tx, PullUp);
ebrus 0:6bc4ac881c8e 103 pin_mode(rx, PullUp);
ebrus 0:6bc4ac881c8e 104
ebrus 0:6bc4ac881c8e 105 // Configure UART
ebrus 0:6bc4ac881c8e 106 obj->baudrate = 9600;
ebrus 0:6bc4ac881c8e 107 obj->databits = USART_WordLength_8b;
ebrus 0:6bc4ac881c8e 108 obj->stopbits = USART_StopBits_1;
ebrus 0:6bc4ac881c8e 109 obj->parity = USART_Parity_No;
ebrus 0:6bc4ac881c8e 110
ebrus 0:6bc4ac881c8e 111 obj->pin_tx = tx;
ebrus 0:6bc4ac881c8e 112 obj->pin_rx = rx;
ebrus 0:6bc4ac881c8e 113
ebrus 0:6bc4ac881c8e 114 init_usart(obj);
ebrus 0:6bc4ac881c8e 115
ebrus 0:6bc4ac881c8e 116 // For stdio management
ebrus 0:6bc4ac881c8e 117 if (obj->uart == STDIO_UART) {
ebrus 0:6bc4ac881c8e 118 stdio_uart_inited = 1;
ebrus 0:6bc4ac881c8e 119 memcpy(&stdio_uart, obj, sizeof(serial_t));
ebrus 0:6bc4ac881c8e 120 }
ebrus 0:6bc4ac881c8e 121
ebrus 0:6bc4ac881c8e 122 }
ebrus 0:6bc4ac881c8e 123
ebrus 0:6bc4ac881c8e 124 void serial_free(serial_t *obj) {
ebrus 0:6bc4ac881c8e 125 // Reset UART and disable clock
ebrus 0:6bc4ac881c8e 126 if (obj->uart == UART_1) {
ebrus 0:6bc4ac881c8e 127 RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
ebrus 0:6bc4ac881c8e 128 RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
ebrus 0:6bc4ac881c8e 129 RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, DISABLE);
ebrus 0:6bc4ac881c8e 130 }
ebrus 0:6bc4ac881c8e 131 if (obj->uart == UART_2) {
ebrus 0:6bc4ac881c8e 132 RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
ebrus 0:6bc4ac881c8e 133 RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
ebrus 0:6bc4ac881c8e 134 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, DISABLE);
ebrus 0:6bc4ac881c8e 135 }
ebrus 0:6bc4ac881c8e 136
ebrus 0:6bc4ac881c8e 137 // Configure GPIOs
ebrus 0:6bc4ac881c8e 138 pin_function(obj->pin_tx, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF));
ebrus 0:6bc4ac881c8e 139 pin_function(obj->pin_rx, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF));
ebrus 0:6bc4ac881c8e 140
ebrus 0:6bc4ac881c8e 141 serial_irq_ids[obj->index] = 0;
ebrus 0:6bc4ac881c8e 142 }
ebrus 0:6bc4ac881c8e 143
ebrus 0:6bc4ac881c8e 144 void serial_baud(serial_t *obj, int baudrate) {
ebrus 0:6bc4ac881c8e 145 obj->baudrate = baudrate;
ebrus 0:6bc4ac881c8e 146 init_usart(obj);
ebrus 0:6bc4ac881c8e 147 }
ebrus 0:6bc4ac881c8e 148
ebrus 0:6bc4ac881c8e 149 void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
ebrus 0:6bc4ac881c8e 150 if (data_bits == 8) {
ebrus 0:6bc4ac881c8e 151 obj->databits = USART_WordLength_8b;
ebrus 0:6bc4ac881c8e 152 } else {
ebrus 0:6bc4ac881c8e 153 obj->databits = USART_WordLength_9b;
ebrus 0:6bc4ac881c8e 154 }
ebrus 0:6bc4ac881c8e 155
ebrus 0:6bc4ac881c8e 156 switch (parity) {
ebrus 0:6bc4ac881c8e 157 case ParityOdd:
ebrus 0:6bc4ac881c8e 158 case ParityForced0:
ebrus 0:6bc4ac881c8e 159 obj->parity = USART_Parity_Odd;
ebrus 0:6bc4ac881c8e 160 break;
ebrus 0:6bc4ac881c8e 161 case ParityEven:
ebrus 0:6bc4ac881c8e 162 case ParityForced1:
ebrus 0:6bc4ac881c8e 163 obj->parity = USART_Parity_Even;
ebrus 0:6bc4ac881c8e 164 break;
ebrus 0:6bc4ac881c8e 165 default: // ParityNone
ebrus 0:6bc4ac881c8e 166 obj->parity = USART_Parity_No;
ebrus 0:6bc4ac881c8e 167 break;
ebrus 0:6bc4ac881c8e 168 }
ebrus 0:6bc4ac881c8e 169
ebrus 0:6bc4ac881c8e 170 if (stop_bits == 2) {
ebrus 0:6bc4ac881c8e 171 obj->stopbits = USART_StopBits_2;
ebrus 0:6bc4ac881c8e 172 } else {
ebrus 0:6bc4ac881c8e 173 obj->stopbits = USART_StopBits_1;
ebrus 0:6bc4ac881c8e 174 }
ebrus 0:6bc4ac881c8e 175
ebrus 0:6bc4ac881c8e 176 init_usart(obj);
ebrus 0:6bc4ac881c8e 177 }
ebrus 0:6bc4ac881c8e 178
ebrus 0:6bc4ac881c8e 179 /******************************************************************************
ebrus 0:6bc4ac881c8e 180 * INTERRUPTS HANDLING
ebrus 0:6bc4ac881c8e 181 ******************************************************************************/
ebrus 0:6bc4ac881c8e 182
ebrus 0:6bc4ac881c8e 183 // not api
ebrus 0:6bc4ac881c8e 184 static void uart_irq(USART_TypeDef* usart, int id) {
ebrus 0:6bc4ac881c8e 185 if (serial_irq_ids[id] != 0) {
ebrus 0:6bc4ac881c8e 186 if (USART_GetITStatus(usart, USART_IT_TC) != RESET) {
ebrus 0:6bc4ac881c8e 187 irq_handler(serial_irq_ids[id], TxIrq);
ebrus 0:6bc4ac881c8e 188 USART_ClearITPendingBit(usart, USART_IT_TC);
ebrus 0:6bc4ac881c8e 189 }
ebrus 0:6bc4ac881c8e 190 if (USART_GetITStatus(usart, USART_IT_RXNE) != RESET) {
ebrus 0:6bc4ac881c8e 191 irq_handler(serial_irq_ids[id], RxIrq);
ebrus 0:6bc4ac881c8e 192 USART_ClearITPendingBit(usart, USART_IT_RXNE);
ebrus 0:6bc4ac881c8e 193 }
ebrus 0:6bc4ac881c8e 194 }
ebrus 0:6bc4ac881c8e 195 }
ebrus 0:6bc4ac881c8e 196
ebrus 0:6bc4ac881c8e 197 static void uart1_irq(void) {
ebrus 0:6bc4ac881c8e 198 uart_irq((USART_TypeDef*)UART_1, 0);
ebrus 0:6bc4ac881c8e 199 }
ebrus 0:6bc4ac881c8e 200 static void uart2_irq(void) {
ebrus 0:6bc4ac881c8e 201 uart_irq((USART_TypeDef*)UART_2, 1);
ebrus 0:6bc4ac881c8e 202 }
ebrus 0:6bc4ac881c8e 203
ebrus 0:6bc4ac881c8e 204 void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) {
ebrus 0:6bc4ac881c8e 205 irq_handler = handler;
ebrus 0:6bc4ac881c8e 206 serial_irq_ids[obj->index] = id;
ebrus 0:6bc4ac881c8e 207 }
ebrus 0:6bc4ac881c8e 208
ebrus 0:6bc4ac881c8e 209 void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
ebrus 0:6bc4ac881c8e 210 IRQn_Type irq_n = (IRQn_Type)0;
ebrus 0:6bc4ac881c8e 211 uint32_t vector = 0;
ebrus 0:6bc4ac881c8e 212 USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
ebrus 0:6bc4ac881c8e 213
ebrus 0:6bc4ac881c8e 214 if (obj->uart == UART_1) {
ebrus 0:6bc4ac881c8e 215 irq_n = USART1_IRQn;
ebrus 0:6bc4ac881c8e 216 vector = (uint32_t)&uart1_irq;
ebrus 0:6bc4ac881c8e 217 }
ebrus 0:6bc4ac881c8e 218
ebrus 0:6bc4ac881c8e 219 if (obj->uart == UART_2) {
ebrus 0:6bc4ac881c8e 220 irq_n = USART2_IRQn;
ebrus 0:6bc4ac881c8e 221 vector = (uint32_t)&uart2_irq;
ebrus 0:6bc4ac881c8e 222 }
ebrus 0:6bc4ac881c8e 223
ebrus 0:6bc4ac881c8e 224 if (enable) {
ebrus 0:6bc4ac881c8e 225
ebrus 0:6bc4ac881c8e 226 if (irq == RxIrq) {
ebrus 0:6bc4ac881c8e 227 USART_ITConfig(usart, USART_IT_RXNE, ENABLE);
ebrus 0:6bc4ac881c8e 228 } else { // TxIrq
ebrus 0:6bc4ac881c8e 229 USART_ITConfig(usart, USART_IT_TC, ENABLE);
ebrus 0:6bc4ac881c8e 230 }
ebrus 0:6bc4ac881c8e 231
ebrus 0:6bc4ac881c8e 232 NVIC_SetVector(irq_n, vector);
ebrus 0:6bc4ac881c8e 233 NVIC_EnableIRQ(irq_n);
ebrus 0:6bc4ac881c8e 234
ebrus 0:6bc4ac881c8e 235 } else { // disable
ebrus 0:6bc4ac881c8e 236
ebrus 0:6bc4ac881c8e 237 int all_disabled = 0;
ebrus 0:6bc4ac881c8e 238
ebrus 0:6bc4ac881c8e 239 if (irq == RxIrq) {
ebrus 0:6bc4ac881c8e 240 USART_ITConfig(usart, USART_IT_RXNE, DISABLE);
ebrus 0:6bc4ac881c8e 241 // Check if TxIrq is disabled too
ebrus 0:6bc4ac881c8e 242 if ((usart->CR1 & USART_CR1_TXEIE) == 0) all_disabled = 1;
ebrus 0:6bc4ac881c8e 243 } else { // TxIrq
ebrus 0:6bc4ac881c8e 244 USART_ITConfig(usart, USART_IT_TXE, DISABLE);
ebrus 0:6bc4ac881c8e 245 // Check if RxIrq is disabled too
ebrus 0:6bc4ac881c8e 246 if ((usart->CR1 & USART_CR1_RXNEIE) == 0) all_disabled = 1;
ebrus 0:6bc4ac881c8e 247 }
ebrus 0:6bc4ac881c8e 248
ebrus 0:6bc4ac881c8e 249 if (all_disabled) NVIC_DisableIRQ(irq_n);
ebrus 0:6bc4ac881c8e 250
ebrus 0:6bc4ac881c8e 251 }
ebrus 0:6bc4ac881c8e 252 }
ebrus 0:6bc4ac881c8e 253
ebrus 0:6bc4ac881c8e 254 /******************************************************************************
ebrus 0:6bc4ac881c8e 255 * READ/WRITE
ebrus 0:6bc4ac881c8e 256 ******************************************************************************/
ebrus 0:6bc4ac881c8e 257
ebrus 0:6bc4ac881c8e 258 int serial_getc(serial_t *obj) {
ebrus 0:6bc4ac881c8e 259 USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
ebrus 0:6bc4ac881c8e 260 while (!serial_readable(obj));
ebrus 0:6bc4ac881c8e 261 return (int)(USART_ReceiveData(usart));
ebrus 0:6bc4ac881c8e 262 }
ebrus 0:6bc4ac881c8e 263
ebrus 0:6bc4ac881c8e 264 void serial_putc(serial_t *obj, int c) {
ebrus 0:6bc4ac881c8e 265 USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
ebrus 0:6bc4ac881c8e 266 while (!serial_writable(obj));
ebrus 0:6bc4ac881c8e 267 USART_SendData(usart, (uint16_t)c);
ebrus 0:6bc4ac881c8e 268 }
ebrus 0:6bc4ac881c8e 269
ebrus 0:6bc4ac881c8e 270 int serial_readable(serial_t *obj) {
ebrus 0:6bc4ac881c8e 271 int status;
ebrus 0:6bc4ac881c8e 272 USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
ebrus 0:6bc4ac881c8e 273 // Check if data is received
ebrus 0:6bc4ac881c8e 274 status = ((USART_GetFlagStatus(usart, USART_FLAG_RXNE) != RESET) ? 1 : 0);
ebrus 0:6bc4ac881c8e 275 return status;
ebrus 0:6bc4ac881c8e 276 }
ebrus 0:6bc4ac881c8e 277
ebrus 0:6bc4ac881c8e 278 int serial_writable(serial_t *obj) {
ebrus 0:6bc4ac881c8e 279 int status;
ebrus 0:6bc4ac881c8e 280 USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
ebrus 0:6bc4ac881c8e 281 // Check if data is transmitted
ebrus 0:6bc4ac881c8e 282 status = ((USART_GetFlagStatus(usart, USART_FLAG_TXE) != RESET) ? 1 : 0);
ebrus 0:6bc4ac881c8e 283 return status;
ebrus 0:6bc4ac881c8e 284 }
ebrus 0:6bc4ac881c8e 285
ebrus 0:6bc4ac881c8e 286 void serial_clear(serial_t *obj) {
ebrus 0:6bc4ac881c8e 287 USART_TypeDef *usart = (USART_TypeDef *)(obj->uart);
ebrus 0:6bc4ac881c8e 288 USART_ClearFlag(usart, USART_FLAG_TXE);
ebrus 0:6bc4ac881c8e 289 USART_ClearFlag(usart, USART_FLAG_RXNE);
ebrus 0:6bc4ac881c8e 290 }
ebrus 0:6bc4ac881c8e 291
ebrus 0:6bc4ac881c8e 292 void serial_pinout_tx(PinName tx) {
ebrus 0:6bc4ac881c8e 293 pinmap_pinout(tx, PinMap_UART_TX);
ebrus 0:6bc4ac881c8e 294 }
ebrus 0:6bc4ac881c8e 295
ebrus 0:6bc4ac881c8e 296 void serial_break_set(serial_t *obj) {
ebrus 0:6bc4ac881c8e 297 }
ebrus 0:6bc4ac881c8e 298
ebrus 0:6bc4ac881c8e 299 void serial_break_clear(serial_t *obj) {
ebrus 0:6bc4ac881c8e 300 }
ebrus 0:6bc4ac881c8e 301
ebrus 0:6bc4ac881c8e 302 #endif