stm32的串口空闲中断接收数据

}

中断优先级配置：
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure one bit for preemption priority */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the USART2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//Enable DMA Channel4 Interrupt
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//Enable DMA Channel7 Interrupt
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel7_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/*Enable DMA Channel5 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/*Enable DMA Channel6 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel6_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

}

数组定义，含义如题名：
u8 USART1_SEND_DATA[512];
u8 USART2_SEND_DATA[512];
u8 USART1_RECEIVE_DATA[512];
u8 USART2_RECEIVE_DATA[512];
u8 USART1_TX_Finish=1;// USART1发送完成标志量

u8 USART2_TX_Finish=1;// USART2发送完成标志量

USART1中断服务函数
void USART1_IRQHandler(void)
{
u16 DATA_LEN;
u16 i;
if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)//如果为空闲总线中断
{
DMA_Cmd(DMA1_Channel5, DISABLE);//关闭DMA,防止处理其间有数据
//USART_RX_STA = USART1->SR;//先读SR，然后读DR才能清除
//USART_RX_STA = USART1->DR;
DATA_LEN=512-DMA_GetCurrDataCounter(DMA1_Channel5);
if(DATA_LEN > 0)
{
while(USART1_TX_Finish==0)//等待数据传输完成才下一次
{
;

}

//将数据送DMA存储地址
for(i=0;iTA_LEN;i )
{
USART1_SEND_DATA=USART1_RECEIVE_DATA;
}
//USART用DMA传输替代查询方式发送，克服被高优先级中断而产生丢帧现象。
DMA_Cmd(DMA1_Channel4, DISABLE);//改变datasize前先要禁止通道工作
DMA1_Channel4->CNDTR=DATA_LEN;//DMA1,传输数据量
USART1_TX_Finish=0;//DMA传输开始标志量
DMA_Cmd(DMA1_Channel4, ENABLE);
}
//DMA_Cmd(DMA1_Channel5, DISABLE);//关闭DMA,防止处理其间有数据
DMA_ClearFlag(DMA1_FLAG_GL5 | DMA1_FLAG_TC5 | DMA1_FLAG_TE5 | DMA1_FLAG_HT5);//清标志
DMA1_Channel5->CNDTR = 512;//重装填
DMA_Cmd(DMA1_Channel5, ENABLE);//处理完,重开DMA
//读SR后读DR清除Idle
i = USART1->SR;
i = USART1->DR;
}
if(USART_GetITStatus(USART1, USART_IT_PE | USART_IT_FE | USART_IT_NE) != RESET)//出错
{
USART_ClearITPendingBit(USART1, USART_IT_PE | USART_IT_FE | USART_IT_NE);
}
USART_ClearITPendingBit(USART1, USART_IT_TC);
USART_ClearITPendingBit(USART1, USART_IT_IDLE);

}

USART2中断服务函数
void USART2_IRQHandler(void)
{
u16 DATA_LEN;
u16 i;
if(USART_GetITStatus(USART2, USART_IT_IDLE) != RESET)//如果为空闲总线中断
{
DMA_Cmd(DMA1_Channel6, DISABLE);//关闭DMA,防止处理其间有数据
//USART_RX_STA = USART1->SR;//先读SR，然后读DR才能清除
//USART_RX_STA = USART1->DR;
DATA_LEN=512-DMA_GetCurrDataCounter(DMA1_Channel6);
if(DATA_LEN > 0)
{
while(USART2_TX_Finish==0)//等待数据完成才下一次
{
;
}
//将数据送DMA存储地址
for(i=0;iTA_LEN;i )
{
USART2_SEND_DATA=USART2_RECEIVE_DATA;
}
//USART用DMA传输替代查询方式发送，克服被高优先级中断而产生丢帧现象。
DMA_Cmd(DMA1_Channel7, DISABLE);//改变datasize前先要禁止通道工作
DMA1_Channel7->CNDTR=DATA_LEN; //DMA1,传输数据量
USART2_TX_Finish=0;//DMA传输开始标志量
DMA_Cmd(DMA1_Channel7, ENABLE);
}
//DMA_Cmd(DMA1_Channel5, DISABLE);//关闭DMA,防止处理其间有数据
DMA_ClearFlag(DMA1_FLAG_GL6 | DMA1_FLAG_TC6 | DMA1_FLAG_TE6 | DMA1_FLAG_HT6);//清标志
DMA1_Channel6->CNDTR = 512;//重装填
DMA_Cmd(DMA1_Channel6, ENABLE);//处理完,重开DMA
//读SR后读DR清除Idle
i = USART2->SR;
i = USART2->DR;
}
if(USART_GetITStatus(USART2, USART_IT_PE | USART_IT_FE | USART_IT_NE) != RESET)//出错
{
USART_ClearITPendingBit(USART2, USART_IT_PE | USART_IT_FE | USART_IT_NE);
}
USART_ClearITPendingBit(USART2, USART_IT_TC);
USART_ClearITPendingBit(USART2, USART_IT_IDLE);