msp430操作ADC0808（A/D转换)

#include<msp430x14x.h>
#include"lcd.h"

#define DATA_DIRIN P3DIR=0x00;
#define DATA P3IN

#define START_DIROUT P4DIR|=BIT0   //P4.0->START
#define CLR_START P4OUT&=~BIT0
#define SET_START P4OUT|=BIT0

#define OE_DIROUT P4DIR|=BIT1      //P4.1->OE
#define CLR_OE    P4OUT&=~BIT1
#define SET_OE P4OUT|=BIT1

#define EOC_DIROUT P4DIR|=BIT2     //P4.2->EOC
#define EOC_DIRIN  P4DIR&=~BIT2
#define EOC_READ   P4IN&BIT2
#define CLR_EOC P4OUT&=~BIT2
#define SET_EOC P4OUT|=BIT2

unsigned char voltageChar[6]="0.00V";
void DelayXms(unsigned int i);  //delay about x ms
int main( void )
{
  unsigned int v;
  // Stop watchdog timer to prevent time out reset
  WDTCTL = WDTPW + WDTHOLD;
  P5SEL |= BIT6;
  LcdReset();
  DATA_DIRIN;
  START_DIROUT;
  OE_DIROUT;
  EOC_DIRIN;
  while(1){
  CLR_START;
  CLR_OE;
  SET_START;
  DelayXms(1);
  CLR_START;   
  while(!(P4IN&0x04));
  SET_OE;
  v = DATA;
  CLR_OE;
  DelayXms(500);
  }
  return 0;
}

void DelayXms(unsigned int i){
    unsigned int j;
    for( ; i>0; i--){
      for(j=0;j<200;j++);
    }

}