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18F6527 Internal A/D converters

 
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PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Nov 20, 2006 12:30 pm     Reply with quote
Your test program is too complicated. Try this simple program
and see if it works.
Code:

#include <18F6527.h>
#device adc=10
#fuses HS, NOWDT, PUT ,BROWNOUT, NOLVP
#use delay(clock=10000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

//===================================
void main()
{
int16 result;

setup_adc_ports(ALL_ANALOG);
setup_adc(ADC_CLOCK_DIV_8);
set_adc_channel(0);
delay_us(20);

while(1)
  {
   result = read_adc(); 
   printf("%lx \n\r",result);
   delay_ms(500);
  }

}
Ttelmah
Guest
PostPosted: Mon Nov 20, 2006 3:30 pm     Reply with quote
You have a huge amount of stuff in your code, that has been remarked out. Remove this, and repost, _showing the declarations of the variables used to hold the ADC valuea_. Also use the 'code' buttons to post.
Also, consider using an array, or struture to allow the whole thing to be done with one loop. Something like:
Code:

structure values {
    int16 threeDC;
    int16 fiveVDC;
    int16 fiveVRef;
    int16 fortyeightVDC;
    int16 PPDDetect;
    int16 OpAmpPwr;
}

union {
    int16 readings[6];
    stucture values ADC;
} VIN;

void read_volts(void) {
    int8 ctr;
    for (ctr=0;ctr<7;ctr++) {
       set_adc_channel(ctr);
       delay_us(20);
       VIN.readings[ctr]=read_adc();
    }
}

//Then in your main:
while (true) {
    read_volts();
    printf("Three V line is at %d\n\r",VIN.ADC.threeDC);
    delay_ms(500);
}

Just showing how this would work for one value (but reading six).
A lot smaller, simpler to read etc. etc..

Best Wishes
bill conley
Guest
PostPosted: Mon Nov 20, 2006 9:17 pm     Reply with quote
Thanks Guys...I think I have it working. It wasn't the firmware, it was the hardware.

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