adc_test.c

在msp430f149环境下,用iar编译,实现ADC转换

#include  <msp430x14x.h>
#define uchar unsigned char
#define uint unsigned int
uchar key_buffer;
uchar key_long;
uchar digit[8] = {1,2,3,4,5,6,7,8};
uint con = 0 ;

unsigned char seg[]={
        0x3f,0x06,0x5b,0x4f,
	0x66,0x6d,0x7d,0x07,
	0x7f,0x6f,0x77,0x7c,
	0x39,0x5e,0x79,0x71,
	0xbf,0x86,0xdb,0xcf,
	0xe6,0xed,0xfd,0x87,
	0xff,0xef,0xf7,0xfc,
	0xb9,0xde,0xf9,0xf1,

	0x80,0x40,0x00,0x73,0xc0};

void delay(int v)
    {
        while(v!=0)v--;
    }

void disp(void)
    {
    unsigned char i=0,j=0;
    unsigned char temp_wei=0x0,temp_duan=0;
    P4DIR  =  0x3f;
    for(i=0;i<8;i++)
      {
        P4OUT  &=  ~BIT3;
        temp_duan=seg[digit[i]] ;
        _NOP();
        for(j=0;j<8;j++)
            {
             if(temp_duan&0x80)
                P4OUT  |=   BIT5;
             else
                P4OUT  &=  ~BIT5;
             temp_duan=temp_duan<<1;
             P4OUT  &=   ~BIT4;   P4OUT  |=  BIT4;
            }
         P4OUT  =  (P4IN&0xf8) | temp_wei;
         P4OUT  |=   BIT3;
         temp_wei++;
         delay(380);
      }
     P4OUT  &=  ~BIT3;
     }

void dc_adc(void)
    {
        int i ;
        long dc_adc1=0;

        for(i=0;i<16;i++)
            {
                ADC12CTL0 |= ADC12SC;       // Start conversion
                while ((ADC12IFG & BIT0)==0);
                dc_adc1 = dc_adc1 + ADC12MEM0;
            }
          dc_adc1 = dc_adc1 >> 4 ;

        for(i=0;i<4;i++)
            {
                digit[3-i]= dc_adc1%10;
                dc_adc1 = dc_adc1 / 10 ;
            }

    }



void main(void)
{
    char i ;
  WDTCTL = WDTPW + WDTHOLD;             // Stop watchdog timer
  P4DIR=0x1f;
  P1DIR=0x0f;
  P6DIR = 0XFF ;
  P3DIR = 0XFF ;
    P2DIR=0X0f;
    P2OUT=0X0f;
    P2IE=0Xf0;
    P2IES=0xf0;
    P2IFG=0;
  P4DIR = 0XFF;
        P6SEL = 0x01;                               // Enable A/D channel inputs
          ADC12CTL0 = ADC12ON+MSC+SHT0_2+ REFON  ;  //+ REFON ;           // Turn on ADC12, set sampling time
          ADC12CTL1 = SHP  ;                // Use sampling timer, single sequence
          ADC12MCTL0 = INCH_0 + SREF_1;     // ref+=1.5v, channel = A0
          ADC12CTL0 |= ENC;                 // Enable conversions

  for (;;)
    {
        for(i=0;i<38;i++)
            disp();
        dc_adc();
        
        _NOP();                             // Required only for C-spy
  }
}