新手求助

xiaojiang · 发表于 2016-4-14 23:15:09

按教程自己为串口3通信，为啥不能通信，求高手解答
void My_USART3_Init()
{
GPIO_InitTypeDef GPIO_InitStruct;
USART_InitTypeDef USART_InitStruct;
NVIC_InitTypeDef NVIC_InitStruct;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD,ENABLE);

GPIO_PinAFConfig(GPIOD, GPIO_PinSource8, GPIO_AF_USART3);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource9, GPIO_AF_USART3);
GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Pin= GPIO_Pin_8;
GPIO_InitStruct.GPIO_OType=GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd= GPIO_PuPd_UP;
GPIO_InitStruct.GPIO_Speed=GPIO_Speed_100MHz;
GPIO_Init(GPIOD, &GPIO_InitStruct);

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

USART_InitStruct.USART_BaudRate=115200;
USART_InitStruct.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
USART_InitStruct.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;
USART_InitStruct.USART_Parity=USART_Parity_No;
USART_InitStruct.USART_StopBits=USART_StopBits_1;
USART_InitStruct.USART_WordLength=USART_WordLength_8b;
USART_Init(USART3, &USART_InitStruct);
USART_Cmd(USART3,ENABLE);
USART_ITConfig(USART3,USART_IT_RXNE,ENABLE)
;
NVIC_InitStruct.NVIC_IRQChannel=USART3_IRQn;
NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=1;
NVIC_InitStruct.NVIC_IRQChannelSubPriority=1;
NVIC_Init(&NVIC_InitStruct);
}
void USART3_IRQHandler()
{
u8 res;
if(USART_GetITStatus(USART3,USART_IT_RXNE))
{

res=USART_ReceiveData(USART3);
USART_SendData(USART3,res);
}
}