【STM32F411RENucleo】- printf函数重定义

只看该作者 · 2015-2-8 00:59

本帖最后由 dawei360 于 2015-2-8 12:09 编辑

串口的学习中printf函数的重定义是必须的，方便使用各种参数！
在STM32F4Nucleo 板子中，利用STM32F4cube进行开发简单方便，下面来解释小怎么结合CUBE软件小改动程序来实现我们想要的功能。
cubemx 中设置：

#include "UartPrintf.h"

UART_HandleTypeDef huart2;

void HAL_MspInit(void)
{
  HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}

void HAL_UART_MspInit(UART_HandleTypeDef* huart)
{
  GPIO_InitTypeDef GPIO_InitStruct;
  if(huart->Instance==USART2)
  {
  /* USER CODE BEGIN USART2_MspInit 0 */

  /* USER CODE END USART2_MspInit 0 */
/* Peripheral clock enable */
__USART2_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_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* USER CODE BEGIN USART2_MspInit 1 */

  /* USER CODE END USART2_MspInit 1 */
  }

}

void HAL_UART_MspDeInit(UART_HandleTypeDef* huart)
{

  if(huart->Instance==USART2)
  {
  /* USER CODE BEGIN USART2_MspDeInit 0 */

  /* USER CODE END USART2_MspDeInit 0 */
/* Peripheral clock disable */
__USART2_CLK_DISABLE();

/**USART2 GPIO Configuration
PA2    ------> USART2_TX
PA3    ------> USART2_RX
*/
HAL_GPIO_DeInit(GPIOA, GPIO_PIN_2|GPIO_PIN_3);
  }

}

void MX_GPIO_Init(void)
{
  /*时钟初始化*/
  __GPIOA_CLK_ENABLE();
}

void MX_USART2_UART_Init(void)
{
  /*初始化串口2*/
  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  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;
  HAL_UART_Init(&huart2);

}

/*串口重定义*/
int fputc(int ch, FILE *f)
{
   uint8_t mych[1];
      mych[0]=(uint8_t)ch;
            while (HAL_UART_GetState(&huart2) == RESET);
            HAL_UART_Transmit(&huart2, mych, 1,10);
            return ch;
}

int fgetc(FILE *f)
{
uint8_t mych[1];
while (HAL_UART_GetState(&huart2) == RESET);
HAL_UART_Receive(&huart2, mych,1,10);
while (HAL_UART_GetState(&huart2) == RESET);
HAL_UART_Transmit(&huart2, mych, 1,10);
return mych[0];
}

void UartPrintfInit(void)
{
MX_GPIO_Init();
MX_USART2_UART_Init();

}