Marco Mayer / Mbed OS Queue

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mbed-os/targets/TARGET_STM/serial_api.c@0:6bf0743ece18, 2020-03-28 (annotated)

Committer:
demayer
Date:
Sat Mar 28 15:28:19 2020 +0000
Revision:
0:6bf0743ece18
IMU Thread with an event-queue running parallel to handle tasks like a 5 times blinking LED. Button with interrupt detected.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
demayer 0:6bf0743ece18 1 /* mbed Microcontroller Library
demayer 0:6bf0743ece18 2 *******************************************************************************
demayer 0:6bf0743ece18 3 * Copyright (c) 2015, STMicroelectronics
demayer 0:6bf0743ece18 4 * All rights reserved.
demayer 0:6bf0743ece18 5 *
demayer 0:6bf0743ece18 6 * Redistribution and use in source and binary forms, with or without
demayer 0:6bf0743ece18 7 * modification, are permitted provided that the following conditions are met:
demayer 0:6bf0743ece18 8 *
demayer 0:6bf0743ece18 9 * 1. Redistributions of source code must retain the above copyright notice,
demayer 0:6bf0743ece18 10 * this list of conditions and the following disclaimer.
demayer 0:6bf0743ece18 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
demayer 0:6bf0743ece18 12 * this list of conditions and the following disclaimer in the documentation
demayer 0:6bf0743ece18 13 * and/or other materials provided with the distribution.
demayer 0:6bf0743ece18 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
demayer 0:6bf0743ece18 15 * may be used to endorse or promote products derived from this software
demayer 0:6bf0743ece18 16 * without specific prior written permission.
demayer 0:6bf0743ece18 17 *
demayer 0:6bf0743ece18 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
demayer 0:6bf0743ece18 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
demayer 0:6bf0743ece18 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
demayer 0:6bf0743ece18 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
demayer 0:6bf0743ece18 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
demayer 0:6bf0743ece18 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
demayer 0:6bf0743ece18 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
demayer 0:6bf0743ece18 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
demayer 0:6bf0743ece18 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
demayer 0:6bf0743ece18 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
demayer 0:6bf0743ece18 28 *******************************************************************************
demayer 0:6bf0743ece18 29 */
demayer 0:6bf0743ece18 30 #include "mbed_assert.h"
demayer 0:6bf0743ece18 31 #include "mbed_error.h"
demayer 0:6bf0743ece18 32 #include "serial_api.h"
demayer 0:6bf0743ece18 33 #include "serial_api_hal.h"
demayer 0:6bf0743ece18 34 #include "PeripheralPins.h"
demayer 0:6bf0743ece18 35
demayer 0:6bf0743ece18 36 #if DEVICE_SERIAL
demayer 0:6bf0743ece18 37
demayer 0:6bf0743ece18 38 void init_uart(serial_t *obj)
demayer 0:6bf0743ece18 39 {
demayer 0:6bf0743ece18 40 struct serial_s *obj_s = SERIAL_S(obj);
demayer 0:6bf0743ece18 41 UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
demayer 0:6bf0743ece18 42 huart->Instance = (USART_TypeDef *)(obj_s->uart);
demayer 0:6bf0743ece18 43
demayer 0:6bf0743ece18 44 huart->Init.BaudRate = obj_s->baudrate;
demayer 0:6bf0743ece18 45 huart->Init.WordLength = obj_s->databits;
demayer 0:6bf0743ece18 46 huart->Init.StopBits = obj_s->stopbits;
demayer 0:6bf0743ece18 47 huart->Init.Parity = obj_s->parity;
demayer 0:6bf0743ece18 48 #if DEVICE_SERIAL_FC
demayer 0:6bf0743ece18 49 huart->Init.HwFlowCtl = obj_s->hw_flow_ctl;
demayer 0:6bf0743ece18 50 #else
demayer 0:6bf0743ece18 51 huart->Init.HwFlowCtl = UART_HWCONTROL_NONE;
demayer 0:6bf0743ece18 52 #endif
demayer 0:6bf0743ece18 53 huart->Init.OverSampling = UART_OVERSAMPLING_16;
demayer 0:6bf0743ece18 54 huart->TxXferCount = 0;
demayer 0:6bf0743ece18 55 huart->TxXferSize = 0;
demayer 0:6bf0743ece18 56 huart->RxXferCount = 0;
demayer 0:6bf0743ece18 57 huart->RxXferSize = 0;
demayer 0:6bf0743ece18 58
demayer 0:6bf0743ece18 59 if (obj_s->pin_rx == NC) {
demayer 0:6bf0743ece18 60 huart->Init.Mode = UART_MODE_TX;
demayer 0:6bf0743ece18 61 } else if (obj_s->pin_tx == NC) {
demayer 0:6bf0743ece18 62 huart->Init.Mode = UART_MODE_RX;
demayer 0:6bf0743ece18 63 } else {
demayer 0:6bf0743ece18 64 huart->Init.Mode = UART_MODE_TX_RX;
demayer 0:6bf0743ece18 65 }
demayer 0:6bf0743ece18 66
demayer 0:6bf0743ece18 67 if (HAL_UART_Init(huart) != HAL_OK) {
demayer 0:6bf0743ece18 68 error("Cannot initialize UART\n");
demayer 0:6bf0743ece18 69 }
demayer 0:6bf0743ece18 70 }
demayer 0:6bf0743ece18 71
demayer 0:6bf0743ece18 72 void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits)
demayer 0:6bf0743ece18 73 {
demayer 0:6bf0743ece18 74 struct serial_s *obj_s = SERIAL_S(obj);
demayer 0:6bf0743ece18 75
demayer 0:6bf0743ece18 76 switch (parity) {
demayer 0:6bf0743ece18 77 case ParityOdd:
demayer 0:6bf0743ece18 78 obj_s->parity = UART_PARITY_ODD;
demayer 0:6bf0743ece18 79 break;
demayer 0:6bf0743ece18 80 case ParityEven:
demayer 0:6bf0743ece18 81 obj_s->parity = UART_PARITY_EVEN;
demayer 0:6bf0743ece18 82 break;
demayer 0:6bf0743ece18 83 default: // ParityNone
demayer 0:6bf0743ece18 84 case ParityForced0: // unsupported!
demayer 0:6bf0743ece18 85 case ParityForced1: // unsupported!
demayer 0:6bf0743ece18 86 obj_s->parity = UART_PARITY_NONE;
demayer 0:6bf0743ece18 87 break;
demayer 0:6bf0743ece18 88 }
demayer 0:6bf0743ece18 89
demayer 0:6bf0743ece18 90 switch (data_bits) {
demayer 0:6bf0743ece18 91 case 9:
demayer 0:6bf0743ece18 92 MBED_ASSERT(parity == UART_PARITY_NONE);
demayer 0:6bf0743ece18 93 obj_s->databits = UART_WORDLENGTH_9B;
demayer 0:6bf0743ece18 94 break;
demayer 0:6bf0743ece18 95 default:
demayer 0:6bf0743ece18 96 case 8:
demayer 0:6bf0743ece18 97 if (parity != UART_PARITY_NONE) {
demayer 0:6bf0743ece18 98 obj_s->databits = UART_WORDLENGTH_9B;
demayer 0:6bf0743ece18 99 } else {
demayer 0:6bf0743ece18 100 obj_s->databits = UART_WORDLENGTH_8B;
demayer 0:6bf0743ece18 101 }
demayer 0:6bf0743ece18 102 break;
demayer 0:6bf0743ece18 103 #if defined UART_WORDLENGTH_7B
demayer 0:6bf0743ece18 104 case 7:
demayer 0:6bf0743ece18 105 if (parity != UART_PARITY_NONE) {
demayer 0:6bf0743ece18 106 obj_s->databits = UART_WORDLENGTH_8B;
demayer 0:6bf0743ece18 107 } else {
demayer 0:6bf0743ece18 108 obj_s->databits = UART_WORDLENGTH_7B;
demayer 0:6bf0743ece18 109 }
demayer 0:6bf0743ece18 110 break;
demayer 0:6bf0743ece18 111 #endif
demayer 0:6bf0743ece18 112 }
demayer 0:6bf0743ece18 113
demayer 0:6bf0743ece18 114 if (stop_bits == 2) {
demayer 0:6bf0743ece18 115 obj_s->stopbits = UART_STOPBITS_2;
demayer 0:6bf0743ece18 116 } else {
demayer 0:6bf0743ece18 117 obj_s->stopbits = UART_STOPBITS_1;
demayer 0:6bf0743ece18 118 }
demayer 0:6bf0743ece18 119
demayer 0:6bf0743ece18 120 init_uart(obj);
demayer 0:6bf0743ece18 121 }
demayer 0:6bf0743ece18 122
demayer 0:6bf0743ece18 123 /******************************************************************************
demayer 0:6bf0743ece18 124 * READ/WRITE
demayer 0:6bf0743ece18 125 ******************************************************************************/
demayer 0:6bf0743ece18 126
demayer 0:6bf0743ece18 127 int serial_readable(serial_t *obj)
demayer 0:6bf0743ece18 128 {
demayer 0:6bf0743ece18 129 struct serial_s *obj_s = SERIAL_S(obj);
demayer 0:6bf0743ece18 130 UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
demayer 0:6bf0743ece18 131 /* To avoid a target blocking case, let's check for
demayer 0:6bf0743ece18 132 * possible OVERRUN error and discard it
demayer 0:6bf0743ece18 133 */
demayer 0:6bf0743ece18 134 if(__HAL_UART_GET_FLAG(huart, UART_FLAG_ORE)) {
demayer 0:6bf0743ece18 135 __HAL_UART_CLEAR_OREFLAG(huart);
demayer 0:6bf0743ece18 136 }
demayer 0:6bf0743ece18 137 // Check if data is received
demayer 0:6bf0743ece18 138 return (__HAL_UART_GET_FLAG(huart, UART_FLAG_RXNE) != RESET) ? 1 : 0;
demayer 0:6bf0743ece18 139 }
demayer 0:6bf0743ece18 140
demayer 0:6bf0743ece18 141 int serial_writable(serial_t *obj)
demayer 0:6bf0743ece18 142 {
demayer 0:6bf0743ece18 143 struct serial_s *obj_s = SERIAL_S(obj);
demayer 0:6bf0743ece18 144 UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
demayer 0:6bf0743ece18 145
demayer 0:6bf0743ece18 146 // Check if data is transmitted
demayer 0:6bf0743ece18 147 return (__HAL_UART_GET_FLAG(huart, UART_FLAG_TXE) != RESET) ? 1 : 0;
demayer 0:6bf0743ece18 148 }
demayer 0:6bf0743ece18 149
demayer 0:6bf0743ece18 150 void serial_pinout_tx(PinName tx)
demayer 0:6bf0743ece18 151 {
demayer 0:6bf0743ece18 152 pinmap_pinout(tx, PinMap_UART_TX);
demayer 0:6bf0743ece18 153 }
demayer 0:6bf0743ece18 154
demayer 0:6bf0743ece18 155 void serial_break_clear(serial_t *obj)
demayer 0:6bf0743ece18 156 {
demayer 0:6bf0743ece18 157 (void)obj;
demayer 0:6bf0743ece18 158 }
demayer 0:6bf0743ece18 159
demayer 0:6bf0743ece18 160 #endif /* DEVICE_SERIAL */