STM32F103C8T6 串口1为什么不工作？

2万 · 2021-1-18 20:48

用同样的程序，在这个芯片中初始化串口三，发送都没问题，修改时钟和gpio，再用于串口1上就有问题了，这个PA9的端口是没问题的，我不用串口直接置1都是可行的，可为什么串口1不工作我就搞不懂了
      int main(void)
{
      SystemInit();//ÅäÖÃÏµÍ³Ê±ÖÓÎª 72M
      LED_Init();//led³õÊ¼»¯
      LED(ON);


            GPIO_InitTypeDef GPIO_InitStructure;
            USART_InitTypeDef USART_InitStructure;

      /* Ê¹ÄÜ USART1 Ê±ÖÓ*/
            RCC_APB1PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
            RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);


/* USART1 Ê¹ÓÃIO¶Ë¿ÚÅäÖÃ */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸´ÓÃÍÆÍìÊä³ö
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;       //¸¡¿ÕÊäÈë
  GPIO_Init(GPIOA, &GPIO_InitStructure); //³õÊ¼»¯GPIOA

      /* USART1 ¹¤×÷Ä£Ê½ÅäÖÃ */
      USART_InitStructure.USART_BaudRate = 115200;       //²¨ÌØÂÊÉèÖÃ£º9600
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;       //Êý¾ÝÎ»ÊýÉèÖÃ£º8Î»
      USART_InitStructure.USART_StopBits = USART_StopBits_1;       //Í£Ö¹Î»ÉèÖÃ£º1Î»
      USART_InitStructure.USART_Parity = USART_Parity_No ;  //ÊÇ·ñÆæÅ¼Ð£Ñé£ºÎÞ
      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;       //Ó²¼þÁ÷¿ØÖÆÄ£Ê½ÉèÖÃ£ºÃ»ÓÐÊ¹ÄÜ
      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//½ÓÊÕÓë·¢ËÍ¶¼Ê¹ÄÜ
      USART_Init(USART1, &USART_InitStructure);  //³õÊ¼»¯USART1

/*Ê¹ÄÜ´®¿Ú1½ÓÊÕÖÐ¶Ï*/
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
  USART_Cmd(USART1, ENABLE);// USART3Ê¹ÄÜ

      /*·¢ËÍÒ»¸ö×Ö½ÚÊý¾Ý*/
while(1)
{
      u8 i=0xFF;
USART_SendData(USART1,i);
}
}