Interfacing ADS7807

Driver for interfacing ADS7807 with PIC microcontroller( compiled in CCS PICC)

#define sclk  PIN_D3
#define sdata PIN_D4
#define rc   PIN_D5
#define busy  PIN_D6
#define cs    PIN_C5

void init_ads7807()
{
    output_low(sclk);
    output_high(rc);
    delay_us(2);
    output_high(cs);
}

int32 read_ads7807()
{
BYTE i;
int32 adc_result=0;

while(!input(busy));
output_low(rc);
delay_cycles(1);
output_low(cs);
delay_us(1);
output_high(cs);
delay_cycles(1);
output_high(rc);
while(!input(busy));
output_low(cs);
    for(i=1;i<=16;++i)
    {
        output_high(sclk);
        shift_left(&adc_result,4,input(sdata));
        output_low(sclk);
    }
output_high(cs);
adc_result*=7629;
return adc_result/10000;
}