99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
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/*
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* Serial communication for STM32F042 boards.
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*
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* Copyright (C) 2019 Eug Krashtan <eug.krashtan@gmail.com>
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* This file may be distributed under the terms of the GNU GPLv3 license.
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*
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*/
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#include "stm32f0xx_hal.h"
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#include <string.h>
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#include "autoconf.h" // CONFIG_SERIAL_BAUD
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#include "board/serial_irq.h" // serial_rx_byte
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#include "sched.h" // DECL_INIT
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UART_HandleTypeDef huart2;
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static uint8_t rxbuf, txbuf;
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void USART2_IRQHandler(void)
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{
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HAL_UART_IRQHandler(&huart2);
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}
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/**
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* @brief USART2 Initialization Function
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* @param None
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* @retval None
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*/
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void UartInit(void)
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{
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huart2.Instance = USART2;
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huart2.Init.BaudRate = CONFIG_SERIAL_BAUD;
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huart2.Init.WordLength = UART_WORDLENGTH_8B;
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huart2.Init.StopBits = UART_STOPBITS_1;
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huart2.Init.Parity = UART_PARITY_NONE;
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huart2.Init.Mode = UART_MODE_TX_RX;
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huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
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huart2.Init.OverSampling = UART_OVERSAMPLING_16;
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huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
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huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
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HAL_UART_Init(&huart2);
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HAL_UART_Receive_IT(&huart2,&rxbuf,(uint16_t)1);
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}
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DECL_INIT(UartInit);
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void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
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{
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if (huart == &huart2) {
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serial_rx_byte(rxbuf);
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HAL_UART_Receive_IT(&huart2,&rxbuf,(uint16_t)1);
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}
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}
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void serial_enable_tx_irq(void)
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{
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while(huart2.gState != HAL_UART_STATE_READY);
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if(serial_get_tx_byte(&txbuf) == 0) {
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HAL_UART_Transmit_IT(&huart2,&txbuf,(uint16_t)1);
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}
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}
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void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
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{
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if (huart == &huart2)
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serial_enable_tx_irq();
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}
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/**
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* @brief UART MSP Initialization
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* @param huart: UART handle pointer
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* @retval None
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*/
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void HAL_UART_MspInit(UART_HandleTypeDef* huart)
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{
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GPIO_InitTypeDef GPIO_InitStruct = {0};
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if(huart->Instance==USART2)
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{
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/* Peripheral clock enable */
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__HAL_RCC_USART2_CLK_ENABLE();
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__HAL_RCC_GPIOA_CLK_ENABLE();
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/**USART2 GPIO Configuration
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PA2 ------> USART2_TX
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PA3 ------> USART2_RX
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*/
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GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
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GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
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GPIO_InitStruct.Alternate = GPIO_AF1_USART2;
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HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
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/* USART2 interrupt Init */
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HAL_NVIC_SetPriority(USART2_IRQn, 0, 0);
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HAL_NVIC_EnableIRQ(USART2_IRQn);
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}
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}
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