STM32F1的USART3一直陷入死循环

只看该作者 · 2024-1-26 10:07

void USART3_Config(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;
      RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART3| RCC_APB2Periph_GPIOB,ENABLE);
      GPIO_InitStructure.GPIO_Pin =GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOB, &GPIO_InitStructure);
      GPIO_InitStructure.GPIO_Pin =GPIO_Pin_11;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOAtiNG;
      GPIO_Init(GPIOB, &GPIO_InitStructure);
      /*USART3 mode config*/
      USART_InitStructure.USART_BaudRate=9200;
      USART_InitStructure.USART_WordLength=USART_WordLength_8b;
      USART_InitStructure.USART_StopBits=USART_StopBits_1;
      USART_InitStructure.USART_Parity=USART_Parity_No;
      USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
      USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;
      USART_Init(USART3,&USART_InitStructure);
      USART_Cmd(USART3,ENABLE);
}

int fputc(int ch,FILE *f)
{
      USART_SendData(USART3,(unsigned char)ch);
      while(USART_GetFlagStatus(USART3,USART_FLAG_TC)!=SET);
      return(ch);
}

static char *itoa(int value, char *string, int radix)
{
      int    i, d;
      int    flag = 0;
      char *ptr = string;

      /* This implementation only works for decimal numbers. */
      if (radix != 10)
      {
         *ptr = 0;
         return string;
      }

      if (!value)
      {
         *ptr++ = 0x30;
         *ptr = 0;
         return string;
      }