[求助] STM32串口问题

A永不言弃A 2015-1-5 09:59 楼主

为什么我的串口能发送数据，但是接收不到数据呢，求大神指导，我是新手
这是我的中断程序，怎么接受不到中断呢，灯没有亮，是串口的问题还是中断的问题？
void USART1_IRQHandler(void)
{
u8 S;
u8 D;
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
USART_ClearITPendingBit(USART1,USART_IT_RXNE);
GPIO_SetBits(GPIOC, GPIO_Pin_4);
delay_ms(500);
if(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) != RESET)
{
USART_SendData(USART1, S);
while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
USART_SendData(USART1, D);
while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
GPIO_SetBits(GPIOC, GPIO_Pin_4);
}
}
}

下面是我的寄存器配置，哪里出了问题，求指导

void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

NVIC_InitStructure.NVIC_IRQChannel=EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);

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

#ifdef  VECT_TAB_RAM
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
}

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC| RCC_APB2Periph_GPIOD | RCC_APB2Periph_AFIO|RCC_APB2Periph_SPI1 |RCC_APB2Periph_USART1, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;  //USART1 TxD
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;  //USART1 RxD
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING ;
GPIO_Init(GPIOA, &GPIO_InitStructure);