PIC24FJ128GA306 und DMA

void __attribute__((__interrupt__, auto_psv)) _DMA0Interrupt(void)

{

    IFS0bits.DMA0IF = 0;    //clear flag

    Nop();

}

uint8_t txdata[20] = "1Y3Y567890qwertyuiop";

//UART setup

        U2MODE = 0; // disable UART

        U2BRG = DBRG;

        U2MODEbits.BRGH = 1;

        U2MODEbits.UARTEN = 1; // enable UART

        U2STAbits.UTXEN = 1; //Enable TX PIN AFTER U2MODE!!

        U2STAbits.UTXISEL0 = 1;

        U2STAbits.UTXISEL1 = 0;

   //CLear IF Flags 

        IFS1bits.U2RXIF = 0;

        IFS1bits.U2TXIF = 0; 

//DMA    

DMACONbits.DMAEN = 1;   //enable DMA

DMACONbits.PRSSEL = 1;  //round robin sceme

DMASRC0=(unsigned short int)&txdata;

DMADST0 = (volatile unsigned int)&U2TXREG;

//DMA0 channel configuration (Transmit)

DMACH0bits.CHEN = 0;    //disable DMA channel 0 for the moment

DMACH0bits.BYTE = 1;    //Transfer is bytewise

DMACH0bits.TRMODE = 0b00; //one shot tranfer

DMACH0bits.DAMODE = 0b00; //destination address is fixed

DMACH0bits.SAMODE = 0b01; //source address is incremented on event

// Send Data from Array1 to UART2

// UART 2 Transmitter DMA0 is configured to use the UART?s receive interrupt as a trigger.   

DMAINT0bits.CHSEL = 0b100000; 

DMAINT0bits.DONEIF = 0;         //reset done interrupt flag

DMAL = 0;

DMAH = 0xFFFF;

// Transfer now:

DMACNT0=10;

// DMA Interrupt

IPC1bits.DMA0IP = 2;   //This is a low priority interrupt

IFS0bits.DMA0IF = 0;   //reset Flag

IEC0bits.DMA0IE = 1;   //enable Interrupt

// ENable DMA

 DMACH0bits.CHEN = 1;    //Enable TX DMA

//enable trigger source interrupt

IFS1bits.U2TXIF = 1;        //make sure, flag is set for first transfer

//reset bits

DMAINT0bits.DONEIF = 0;

//kick off data transfer by generating a request

DMACH0bits.CHREQ = 1;

Nop();    

while(1);