原创 msp430 数模转换程序

https://static.assets-stash.eet-china.com/album/old-resources/2009/5/14/35b4d226-8f0c-4805-aa45-fbc5ef450e19.rar430#include<msp430x14x.h>

#define unchar unsigned char
 unchar TAB[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
unchar sz[4];
unsigned long  k="4000";
delay1ms()
{
 unsigned char  j;
 
 for(j=0;j<120;j++);
}

void DAC(unsigned long u)
{
  unsigned long us;
  unsigned char i;
  u="u|0xc000";
 
   P3OUT |=BIT5;                   // FS="1";
   _NOP();
   _NOP();
   _NOP();
   _NOP();
   P3OUT &=~BIT5;                //FS=0;
  for(i=0;i<16;i++)
   { 
  us="u";
  if((us&0X8000)==0X8000)     
         P3OUT |= BIT6; 
        else
         P3OUT &=~ BIT6;                              // DIN="us"&0x8000;
       
  P3OUT |=BIT7;           
  _NOP();
  _NOP();
  _NOP();
  _NOP();
 P3OUT &= ~BIT7;              // CLK="0";
  _NOP();
 
  u="u"<<1;
   }
     P3OUT |=BIT5;                   // FS="1";
  _NOP();
 
 

}
 void disp()
{    
  P3OUT=0x08;                   //P0.0=0,选通第一位
 P1OUT=TAB[sz[0]]&0x7f;         //段显
 delay1ms();    //延时
 P1OUT=0xff;                   //消隐

 P3OUT=0x04;                   //P0.1=0,选通第二位
 P1OUT=TAB[sz[1]];        //段显
 delay1ms();    //延时
 P1OUT=0xff;                  //消隐

 P3OUT=0x02;                   //P0.2=0,选通第三位
 P1OUT=TAB[sz[2]];         //段显
 delay1ms();    //延时
 P1OUT=0xff;                   //消隐

 P3OUT=0x01;                   //P0.3=0,选通第四位
 P1OUT=TAB[sz[3]];        //段显
 delay1ms();    //延时
 P1OUT=0xff;                  //消隐
}
void calculate()
{  
 
   sz[0]= 2000*k/4096/ 1000; 
   sz[1]= 2000*k/4096%1000/100;  
   sz[2]= 2000*k/4096%100/10;
   sz[3]= 2000*k/4096%10; 
    
  
}
main()
{
       P1DIR=0xff;
       P3DIR=0XFF;
     
     
      
 while(1)
 {
  P3OUT &=~BIT7;         // CLK="0";
     P3OUT |=BIT5;          // FS="1";
  P3OUT &=~BIT6;           //DIN=0;
  
  calculate();
  disp();
  DAC(k);
              
  
 }
}