pic_sciand_ad7683.c

PIC 单片机串口发送和16位AD AD7683采样程序

#include<pic.h>

__CONFIG (HS & WDTDIS & PWRTEN & BORDIS &LVPDIS & DUNPROT & WRTEN & DEBUGEN &UNPROTECT);
unsigned int ad_value=0x1234;
#define DAT RB2
#define CLK RB1
#define CS  RB0
void	initial()
{
	INTCON=0x00;			
	ADCON1=0X07;			
	PIE1=0;							
	PIE2=0;								
}


void init_7683(void)
{
TRISB0=0;
TRISB1=0;
TRISB2=1;
CS=1;
CLK=1;
}

void   sciint() 
{ 
 SPBRG=0X19;
 TXSTA=0X04;
 RCSTA=0X80;
 TRISC6=1; 
 TRISC7=1; 
 TXEN=1;
} 
void delay5us(void)
{
 asm("nop");  asm("nop");  asm("nop");  asm("nop");  asm("nop");
}

void delay(time)
    unsigned int time;
    {
        unsigned int delay1,delay2;
        for(delay1=0;delay1<=time;delay1++)     
        {
            for(delay2=0;delay2<=50;delay2++)     //1ms delay
            {
                ;
            }
        }
    }

unsigned int ad7683(void)
{
  unsigned int dump=0;
  unsigned char i;
    init_7683();
        CS=0;
		for(i=0;i<=5;i++)								//output 0 at 5th failing clock
		{
			CLK=1;
           delay5us();
            CLK=0;
		}
	
		for(i=0;i<16;i++)
		{
         	CLK=1;
            dump=(dump<<1);
            dump|=DAT;
            CLK=0;
            asm("nop");  asm("nop");  asm("nop");
    	}

       	CLK=1;
        asm("nop"); asm("nop");
        CS=1;
        asm("nop");asm("nop");
        CLK=0;
        return dump;	  
}
main()					
{ 


    TRISC3=0;
    TRISB5=0;
	initial();						
    sciint();   									
	INTCON=INTCON|0xc0;	
	
	while(1)
	{
     ad_value=ad7683();
	 delay(10);
       TXREG=(ad_value&0xff00)>>8;  
     delay(10);
      TXREG=ad_value&0xff; 	
	}
}