ad5302.c

12位DA 5302输出 ADI公司双通道DA转换芯片

#include<pic.h>

__CONFIG (HS & WDTDIS & PWRTEN & BORDIS &LVPDIS & DUNPROT & WRTEN & DEBUGEN &UNPROTECT);
unsigned int ad_value=0x1234;
#define  DIN   RB5
#define  CLK   RB4
#define  SYNC  RB1
#define  LDAC  RB0
void	initial()
{
	INTCON=0x00;			
	ADCON1=0X07;			
	PIE1=0;							
	PIE2=0;								
}


void init_7683(void)
{
TRISB5=0;
TRISB4=0;
TRISB1=0;
TRISB0=0;
CLK   =1;
SYNC  =1;
DIN   =1;
LDAC  =0;
}


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
            {
                ;
            }
        }
    }


void DAC5032(unsigned int out)
{
unsigned char i;
unsigned int dump=0;
 init_7683();
delay5us();
SYNC=1;
CLK=1;
delay5us();
CLK=0;
delay5us();
CLK=1;
delay5us();
CLK=0;
asm("nop");  asm("nop"); asm("nop"); 
SYNC=0;
delay5us();
//---------------------------------
 for(i=0;i<16;i++)
   {
   dump=(out) & 0x8000;
   if(dump==0x8000)	DIN=1;
   else	        	DIN=0; 
   CLK=1;
   delay5us();
   CLK=0;
   out=(out<<1);
   delay5us();
   }
   delay5us();   
//---------------------------------
  SYNC=1;
CLK=1;
  delay5us();
  CLK=0;
  delay5us();
  CLK=1;
  delay5us();
  CLK=0;
  delay5us();
  CLK=1;
  delay5us();
  CLK=0;
  LDAC =0;//--\__
  delay5us();
  CLK=1;
  delay5us();
  CLK=0;
  delay5us();
  CLK=1;
  LDAC =0;//___/
}

 
main()					
{ 
    TRISC3=0;
    TRISB5=0;
	initial();
   	init_7683();					 									
	INTCON=INTCON|0xc0;	
	
	while(1)
	{
    DAC5032(0x0fff);
    delay(5000);
	}
}