请教大神如何去实现STM32F429IGT6的printf函数呢

1、硬件环境

使用UART1，对于STM32F429IGT6来说，其对应引脚为PA9和PA10。PA9->TX, PA10->RX。





2、 软件环境

GPIO初始化


void uart_gpio_init(void)
{
        GPIO_InitTypeDef GPIO_InitStruct;
       
    __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_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
串口格式设置
UART_HandleTypeDef huart1;
void uart_init(void)
{


  huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  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;
  
  HAL_UART_Init(&huart1);
}
重定义fputc函数
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)

PUTCHAR_PROTOTYPE
{
  /* Place your implementation of fputc here */
  /* e.g. write a character to the EVAL_COM1 and Loop until the end of transmission */
  HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);
  return ch;
}