串口通讯问题

mxiaotao · 发表于 2017-2-18 17:01:13

麻烦大神，看一下下面的程序有问题吗？为什么不能实现串口通信#include "sys.h"

void My_Usart_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
USART_InitTypeDef  USART_InitStruct;
NVIC_InitTypeDef  NVIC_InitStruct;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

   GPIO_PinAFConfig(GPIOA,GPIO_PinSource9|GPIO_PinSource10,GPIO_AF_USART1);

GPIO_InitStruct.GPIO_Pin  = GPIO_Pin_9|GPIO_Pin_10;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA,&GPIO_InitStruct);

USART_InitStruct.USART_BaudRate = 115200;
USART_InitStruct.USART_WordLength = USART_WordLength_8b;
USART_InitStruct.USART_StopBits = USART_StopBits_1;
USART_InitStruct.USART_Parity = USART_Parity_No ;
USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_Init(USART1,&USART_InitStruct);
USART_Cmd(USART1,ENABLE);
USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);

NVIC_InitStruct.NVIC_IRQChannel=USART1_IRQn;
NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=2;
NVIC_InitStruct.NVIC_IRQChannelSubPriority=0;
NVIC_Init(&NVIC_InitStruct);

}
void USART1_IRQHandler(void)
{
uint16_t res;
if(USART_GetITStatus(USART1,USART_IT_RXNE))
{
res=USART_ReceiveData(USART1);
   USART_SendData(USART1,res);
}
}
int main(void)
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
My_Usart_Init();
while(1);
}