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