菜鸟再问个问题啊，串口接收发送的

strednly

这是程序源码：
#include <stm32f10x.h>
u16 ch;
void gpio_init()
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;//TX
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//RX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void usart_init()
{
USART_InitTypeDef USART_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_Init(USART1,&USART_InitStructure);

USART_Cmd(USART1, ENABLE);

}

void NVIC_init()
{
NVIC_InitTypeDef NVIC_InitStructure;
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

void USART1_IRQHandler()
{
if(USART_GetFlagStatus(USART1, USART_FLAG_RXNE)!=RESET)//???í????·?
{

ch=USART_ReceiveData(USART1);
USART_SendData(USART1, ch);
}

USART_ClearFlag(USART1, USART_FLAG_RXNE);

}



int main()
{
gpio_init();
usart_init();
NVIC_init();
while(1);
}

想问下printf这个函数怎么用啊，我把这个函数加到主函数或串口中断里面，串口就接收不到数据了。。。。。

qq942266575

putchar

strednly

回复【2楼】qq942266575:
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不管啊，我加到了串口中断，或主函数的while(1)循环里面都没反应啊。。