pic adc programing problem

[suvaraj]

hi to all
im using pic microcontroller 16f877a and use ccs c compiler.i have a level sensor and it has 4 levels(each level has different voltages).i need to use one pin for input and 4 leds used for display which level reached.for example if 2v dc come to input means i need 1st level led on then 3v dc come to input means i need 2st level led on etc.... how to i programme in pic c?pls help me

 

[theepak]

#include <16F877.h>
#use delay(clock=4000000)
#fuses NOWDT,XT,NOPUT,NOPROTECT,NOBROWNOUT,NOLVP,NOCPD,NOWRT,NODEBUG
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7,stream=HOSTPC)
void main()
{
int8 value;
int8 adcvalue;
delay_ms(100);
set_tris_b(0x00);
set_tris_d(0xff);
setup_adc(ADC_CLOCK_INTERNAL);//enables the a/d module //and sets the clock to internal adc clock
setup_adc_ports(ALL_ANALOG);
//sets all the adc pins to analog


while(1)

// iput from 8052 to pic is rd5,d6,d7
// the adc value to 8052 from pic is rb port
{

value=input_d();
value=value & 0xe0;
if(value==0x00)
{
set_adc_channel( 0 );
delay_us(10);adcvalue=read_adc();
output_b(adcvalue);
}
if(value==0x20)
{
set_adc_channel( 1 );
delay_us(10);adcvalue=read_adc();
output_b(adcvalue);
}
if(value==0x40)
{
set_adc_channel( 2 );
delay_us(10);adcvalue=read_adc();
output_b(adcvalue);
}
if(value==0x60)
{
set_adc_channel( 3 );
delay_us(10);adcvalue=read_adc();
output_b(adcvalue);
}
if(value==0x80)
{
set_adc_channel( 4 );
delay_us(10);adcvalue=read_adc();
output_b(adcvalue);
}
if(value==0xa0)
{
set_adc_channel( 5 );
delay_us(10);adcvalue=read_adc();
output_b(adcvalue);
}
if(value==0xc0)
{
set_adc_channel( 6 );
delay_us(10);adcvalue=read_adc();
output_b(adcvalue);
}
if(value==0xe0)
{
set_adc_channel( 7 );
delay_us(10);
adcvalue=read_adc();
output_b(adcvalue);
}
}

}