MSP430f1611 DMA

#include <msp430.h> 

#include "bocas.h"

#include "main.h"

int dmaRS232(const char *text, unsigned int length);

int dmaInit();

static char string1[] = { "a" };

void rs232Init(void)

{

  BITSET(P3SEL, 0xC0);

  BITSET(P3DIR, 0x40);

  BITSET(U1CTL, SWRST);

  BITSET(ME2, UTXE1+URXE1);

  BITSET(U1TCTL, SSEL0);

  BITCLR(U1CTL, SYNC);

  BITCLR(U1CTL, PENA|SPB);

  BITCLR(U1CTL, CHAR);

  U1BR0 = LOW_16(69);

  U1BR1 = HIGH_16(69);

  U1MCTL = 0xAA;

  BITCLR(U1CTL, SWRST);

}

void initInterruptControlledIO(void)

{

  rs232Init();

  // Watchdog deaktivieren

  WDTCTL = WDT_MDLY_32;

  BITCLR(IFG2, URXIFG1);

  BITSET(IE2, URXIE1);

  INT_ENABLE;

}

#pragma vector=DMA_VECTOR

__interrupt void DMA_ISR (void)

{

  BITSET(DMA1CTL, DMAEN);

}

int dmaInit()

{

  BITSET(DMACTL0, DMA1TSEL_10);            // Enable UART1

  BITSET(DMA1CTL, (DMADSTBYTE|DMASRCBYTE));      // Set Byte-Mode

  BITSET(DMA1CTL, DMADT_0);

  BITSET(DMA1CTL, DMASRCINCR_3);

  BITCLR(DMA1CTL, DMAIE);

  BITCLR(DMA1CTL, DMAEN);

  return 0;

}

void main(void)

{

  initInterruptControlledIO();

  dmaInit();

  /* run echo loop */

  while(1) /* run forever */

  {

    dmaRS232(string1, sizeof(string1));

  }

}

/* Name: dmaRS232                           */

/* Function:                              */

/* Parameters:                              */

/* Return:                                */

int dmaRS232 ( const char *text, unsigned int len )

{

  DMA1SZ = len - 1;

  DMA1SA = (int)text + 1;

  DMA1DA = &U1TXBUF;

  U1TXBUF = text[0];

  BITSET(DMA1CTL, DMAEN);

  while((DMA1CTL & DMAIFG) != 1);

  return 0;

} /* end dmaRS232                           */