NUCLEO串口通讯的问题

1万 · 2015-5-21 10:20

我用STM32F070写了个串口1的通讯程序，用RS232转TTL转接座接到
NUCLEO的PA9和PA10上，通讯不成功，串口助手老是收到00.
程序如下：
void uart1_init(INT32U Baud)
{
USART_InitTypeDef  USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef  NVIC_InitStructure;
/* Enable SYSCFG clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG|RCC_APB2Periph_USART1, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE); //Ê¹ÄÜÓÃµ½µÄGPIOAÊ±ÖÓ
//RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART1,ENABLE);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_10MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure); //ÅäÖÃPA9(´®¿Ú1TXD)ÎªÊä³ö¸´ÓÃÍÆÍì

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN;
GPIO_Init(GPIOA,&GPIO_InitStructure); //ÅäÖÃPA10(´®¿Ú1RXD)ÎªÊäÈë

USART_InitStructure.USART_BaudRate=Baud; //²¨ÌØÂÊ
USART_InitStructure.USART_WordLength=USART_WordLength_8b; //8Î»
USART_InitStructure.USART_StopBits=USART_StopBits_1; //1¸öÍ£Ö¹Î»
USART_InitStructure.USART_Parity=USART_Parity_No; //²»Ð£Ñé
USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None; //²»½øÐÐÁ÷¿ØÖÆ
USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx; //Ä£Ê½Îª·¢ËÍºÍ½ÓÊÕË«Ïò

USART_Init(USART1,&USART_InitStructure); //¸ù¾ÝUSART_InitStructureÒÑÌîÐ´µÄ²ÎÊý³õÊ¼»¯´®¿Ú1
USART_Cmd(USART1,ENABLE); //Ê¹ÄÜ´®¿Ú1

USART_GetFlagStatus(USART1,USART_FLAG_TC); //Çå³ý½ÓÊÕÖÐ¶Ï£¬½â¾öµÚÒ»¸ö×Ö½Ú·¢²»³öÈ¥µÄÎÊÌâ

NVIC_InitStructure.NVIC_IRQChannel=USART1_IRQn; //USART1ÖÐ¶ÏºÅ
NVIC_InitStructure.NVIC_IRQChannelPriority=0;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE; //IRQÍ¨µÀÊ¹ÄÜ
NVIC_Init(&NVIC_InitStructure); //¸ù¾ÝNVIC_InitStructÖÐÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯ÍâÉèNVIC¼Ä´æÆ÷

USART_ITConfig(USART1,USART_IT_RXNE,ENABLE); //½ÓÊÕÖÐ¶ÏÊ¹ÄÜ
}

int main(void)
{

//SystemInit(); //ÏµÍ³Ê±ÖÓÅäÖÃº¯Êý£¬Í¨¹ý²»Í¬µÄÊ±ÖÓ¶¨Òå£¬À´Ñ¡Ôñ²»Í¬µÄÖ÷Æµ
led_init();
uart1_init(9600);
  while(1)
{
//USART_SendData(USART1,0X55);
led_turn;
delay_ms(250);

  }




}

请高手看看，谢谢！