LQBMK|UART\bsp_uart.h

#include "UART\bsp_uart.h"
#include "stdio.h"
UART_HandleTypeDef huart1;
/* 加入以下代码, 支持printf函数, 而不需要选择use MicroLIB */
//1个预处理+2个定义+3个函数+1个重映射
#pragma import(__use_no_semihosting)//确保不从C库中使用半主机函数
struct __FILE{                       //避免HAL库某些情况下报错
    int handle;
    /* Whatever you require here. If the only file you are using is */
    /* standard output using printf() for debugging, no file handling */
    /* is required. */
};
FILE __stdout;                      /* FILE 在 stdio.h里面定义. 避免HAL库某些情况下报错*/
/* 不使用半主机模式，至少需要重定义_ttywrch\_sys_exit\_sys_command_string函数,以同时兼容AC6和AC5模式 */
int _ttywrch(int ch){
    ch = ch;
    return ch;
}
void _sys_exit(int x){
    x = x;
}
char *_sys_command_string(char *cmd, int len){
    return NULL;
}


/* MDK下需要重定义fputc函数, printf函数最终会通过调用fputc输出字符串到串口 */
int fputc(int ch, FILE *f){
    while ((USART1->ISR & 0X40) == 0);     /* 等待上一个字符发送完成 */
    USART1->TDR = (uint8_t)ch;             /* 将要发送的字符 ch 写入到DR寄存器 */
    return ch;
}

///* 需要选择use MicroLIB */
//int fputc(int ch, FILE *f){
//  uint8_t temp[1] = {ch};
//  HAL_UART_Transmit(&huart1, temp, 1, 50);//huart1需要根据你的配置修改
//  return ch;
//}
DMA_HandleTypeDef hdma_usart1_tx;
void UART1_Init(void){
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 9600;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
  huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;
  huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart1) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_SetTxFifoThreshold(&huart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_SetRxFifoThreshold(&huart1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_DisableFifoMode(&huart1) != HAL_OK)
  {
    Error_Handler();
  }

}

void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle){
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
  if(uartHandle->Instance==USART1)
  {
  /** Initializes the peripherals clocks
  */
    PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1;
    PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK2;
    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
    {
      Error_Handler();
    }

    /* USART1 clock enable */
    __HAL_RCC_USART1_CLK_ENABLE();

    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**USART1 GPIO Configuration
    PA9     ------> USART1_TX
    PA10     ------> USART1_RX
    */
    GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_10;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

		/* USART1 DMA Init */
    /* USART1_TX Init */
    hdma_usart1_tx.Instance = DMA2_Channel4;           							/*usart1 tx 对应 dma2，通道 4，数据流 7*/
    hdma_usart1_tx.Init.Request = DMA_REQUEST_USART1_TX;						/* 串口1发送DMA请求 */
    hdma_usart1_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;						/* 方向：从内存到外设 */
    hdma_usart1_tx.Init.PeriphInc = DMA_PINC_DISABLE;								/* 外设地址不增 */
    hdma_usart1_tx.Init.MemInc = DMA_MINC_ENABLE;										/* 内存地址自增 */
    hdma_usart1_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;	/* 外设数据单位 **/
    hdma_usart1_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;			/* 内存数据单位 8bit*/
    hdma_usart1_tx.Init.Mode = DMA_NORMAL;													/*DMA 模式：不循环 */
    hdma_usart1_tx.Init.Priority = DMA_PRIORITY_VERY_HIGH;					/* 优先级：高 */
    if (HAL_DMA_Init(&hdma_usart1_tx) != HAL_OK)										/* Configure the DMA stream */
    {
      Error_Handler();
    }
    __HAL_LINKDMA(uartHandle,hdmatx,hdma_usart1_tx);									/* Associate the DMA handle */

		
    /* USART1 interrupt Init */
    HAL_NVIC_SetPriority(USART1_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(USART1_IRQn);
  }
}

void HAL_UART_MspDeInit(UART_HandleTypeDef* uartHandle){

  if(uartHandle->Instance==USART1)
  {
    /* Peripheral clock disable */
    __HAL_RCC_USART1_CLK_DISABLE();

    /**USART1 GPIO Configuration
    PA9     ------> USART1_TX
    PA10     ------> USART1_RX
    */
    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_9|GPIO_PIN_10);

    /* USART1 interrupt Deinit */
    HAL_NVIC_DisableIRQ(USART1_IRQn);
  }
}