Using DMA on both USIC channels

Report Inappropriate Content · ‎Dec 14, 2017

I would like to use a DMA for both USICx channels. For each channel using 2 Service Requests ( 1 for sending, 1 for receiving).
But USIC0 and USIC1 only has SR 2 inputs (?). So i guess i can't use the DMA for both USICs in my case? ( or only using DMA e.g. for either receiving or transmitting) ?

The USIC2 has 4 Service requests, but somehow, if i use the DLR lines 10 and 11 OR SR2 and SR3, no data is transmitted or received. But DLR 8 and 9 works fine with SR0 and SR1
Any ideas, what the problem is here? The registers are configured correct (DLR_SRSELx, DLR->LNEN,...)

my GPDMA interrupt handling looks like this:


void GPDMA1_0_IRQHandler(void){
  OS_EnterInterrupt();
  GPDMA1_GLOBAL_TypeDef* DMARegs = GPDMA1;
  uint32_t Reg;
  // Block finished interrupt
  if( DMARegs->STATUSINT&GPDMA1_STATUSINT_BLOCK_Msk ) 
  {
    Reg = DMARegs->STATUSBLOCK;
	if( Reg&(1<		// uart2 DMA Block complete interrupt
		// clear interrupt flags
		Board.SpiInterface.RxFinishedISR();
	}
	else if( Reg&(1<		// uart2 DMA Block complete interrupt
		// clear interrupt flags
		Board.SpiInterface.TxFinishedISR();
	}
  }	 

  OS_LeaveInterrupt();
}