fet140_dma_02.c

msp430的 AD转换代码 完成msp430的转换功能

//******************************************************************************
//  MSP-FET430P140 Demo - DMA0, Repeated Block To P1OUT, TACCR2, DCO
//
//  Description: DMA0 is used to transfer a string byte-by-byte as a repeating
//  block to P1OUT. Timer_A operates Continuously clocked at ~800Hz with CCR2IFG
//  triggering DMA0. The effect is P1.0/1.1 toggling at different frequencies.
//  ACLK = n/a, MCLK = SMCLK =  TACLK = default DCO ~ 800k
//  //* MSP430F169 Device Required *//
//
//               MSP430F169
//            -----------------
//        /|\|              XIN|-
//         | |                 |
//         --|RST          XOUT|-
//           |                 |
//           |             P1.0|--> LED
//           |             P1.1|-->
//
//  M. Buccini
//  Texas Instruments Inc.
//  Feb 2005
//  Built with IAR Embedded Workbench Version: 3.21A
//******************************************************************************

#include  <msp430x16x.h>

const unsigned char testconst[] = { 0x00, 0x03, 0x02, 0x03, 0x00, 0x01 };

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog
  P1DIR |= 0x03;                            // P1.0/1.1 output
  DMACTL0 = DMA0TSEL_1;                     // CCR2IFG trigger
  DMA0SA = (unsigned int)testconst;         // Source block address
  DMA0DA = P1OUT_;                          // Dest single address
  DMA0SZ = sizeof testconst;                // Block size
  DMA0CTL = DMADT_4 + DMASRCINCR_3 + DMASBDB + DMAEN; // Rpt, inc src, enable
  TACTL = TASSEL_2 + MC_2;                  // SMCLK, cont-mode

  _BIS_SR(LPM0_bits);                       // Enter LPM0
}