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[SOLVED] need help in A/D for 18f4431

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prem123

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can somebody give me a sample code for A/D conversion in mikroc for 18f4431..
or please tell me the error in the following code... 

Code C - [expand]
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unsigned int temp_res;
 
void interrupt()
{
 if(PIR1.ADIF){
  PIR1.ADIF=0;
  ADCON0.GO=1;
 }}
 
void main()
{
 TRISB=0x00;
 TRISD=0x00;
 TRISA=0xFF;
 ANSEL0=0b00000001;
 ANSEL1=0x00;
 ADCHS=0x00;
 ADCON0=0b00110101;
 ADCON1=0b00010000;
 ADCON2=0b01000001;
 ADCON3=0b11000000;
 INTCON.GIE=1;
 INTCON.PEIE=1;
 ADCON0.GO=1;
 PIE1.ADIE=1;
 PIR1.ADIF=0;
 Delay_us(10);
 
while(1)
{
 
 PORTD= 0x00;
 PORTB= 0x00;
 temp_res=Adc_Read(0);
 PORTD = temp_res;       // Send lower 8 bits to PORTD
 PORTB = temp_res >> 2;  // Send 2 most significant bits to RB7, RB6
 
 Delay_ms(50);
}
}
 
Last edited by a moderator:

Code: 
PORTD= 0x00;
PORTB= 0x00;

what you are trying to do in these lines?
 

it is just to clear ports before showing new values....
 

i think these will makes LOW the two ports of the MCU,you are making these pins low and not given any comment to make it high its inside a infinite loop so wont go out.
 
Last edited:
You should use the ADC_Init(); before while loop to initialize ADC.

Add ADCHS.GASEL1 = 0; and ADCHS.GASEL0 = 0; in the configuration. you should connect AVdd to 5 v and Avss to ground.
 
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