DMA reception of stm32 serial port-EEWORLD

Collect

UART5 does not support DMA

Different peripherals require different DMA

UART4 needs to use DMA2 channel 3 or 5

For example:
void DMA1_Channel5_IRQHandler(void)
{
u16 i,j=0;
OS_ENTER_CRITICAL(); /* Tell uC/OS-II that we are starting an ISR */
OSIntNesting++;
OS_EXIT_CRITICAL();
if(DMA_GetITStatus(DMA1_IT_TC5)!= RESET)
{
DMA_ClearITPendingBit(DMA1_IT_GL5); //Clear all interrupt flags
DMA_ClearITPendingBit(DMA1_IT_TC5);
DMA_ClearFlag(DMA1_FLAG_TC5);
/*Each distance test data packet has 3 bytes (labeled A, B, C in sequence), the high bits of the first two bytes are 0, and
the high bit of the last byte is 1, marking the end of this data packet*/
memcpy(Uart_Rx_Backup,Uart_Rx,UART_RX_LEN);
if((Uart_Rx_Backup[0]&0x80) != 0)//
j=1;
else if((Uart_Rx_Backup[1]&0x80) != 0)//
j=2;
else if((Uart_Rx_Backup[2]&0x80) != 0)//
j=0;

for(i=0;i<50;i++)
{
RecorderData_FileWrite[i ]=DecodeLaseData3Byte(Uart_Rx_Backup+i*3+j);
}
}
else if(DMA_GetITStatus(DMA1_IT_HT5) == SET)
{
DMA_ClearITPendingBit(DMA1_IT_HT5);
DMA_ClearITPendingBit(DMA1_IT_GL5);
}
OSIntExit();
}

Keywords：stm32 Reference address：DMA reception of stm32 serial port

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