把串口发送中断使能打开，就再也进入不了接受中断了

moon20704 · 发表于 2015-5-22 23:06:37

我今天遇见一个很奇怪的问题，就是如果串口发送中断使能一打开，串口接受就进入不了中断了，下面是我的函数
void BSP_UART1_Init(uint32_t bps)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

//Connect pin to Periph //á??óI/O?úμ?×ü??
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_1);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;//GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

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

//UART1_DMA_Config();
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
USART_ClearFlag(USART1,USART_FLAG_TXE);
NVIC_USART1_Config();
USART_Cmd(USART1, ENABLE);
}

void NVIC_USART1_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

void USART1_IRQHandler(void)
{
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
USART_ClearITPendingBit(USART1, USART_IT_RXNE);
if(DMARxBufsize == 1)
{
USART_RX_Buffer[0] = USART_ReceiveData(USART1);
if(USART_RX_Buffer[0] == 0xAA)
DMARxBufsize++;
}
else
{
USART_RX_Buffer[DMARxBufsize++] = USART_ReceiveData(USART1);
}
}
}

一旦把USART_ITConfig(USART1, USART_IT_TXE, ENABLE);给屏蔽掉，就正常工作，请教这个到底是什么原因