hi all,

I really need some help on this matter, I'm a litle bit desperate.
basically I have a PIC 16F877 but the ADC ports stoped working(always
returns 0).

1: what could cause the ADC to be ruined completly? 

2: how can I physically test (with a multimeter) if the A/D converter is
ruined?

3: software test: the device is a DLP-2232PB-G (ftdi + pic) and I use PICC
to compile:

#include <16F877A.H>
#device ADC=10
#fuses HS,WDT,NOPUT,NOBROWNOUT,LVP,NOWRT,NOPROTECT
#use delay(clock=20000000,restart_wdt)

setup_adc_ports( 0 ); // 0=ALL_ANALOG
delay_ms(40);
run_AD();

void run_AD()//0xA9
{
   int16 dataword;

   set_adc_channel( buffer[2] );
   delay_us(10);
   dataword = read_adc();
   //return as two bytes to host - LSByte first
   send((int8)(dataword & 0x00ff));//LSByte
   send((int8)(dataword >> 8));//MSByte
   strobe_SND();//send now through ftdi
}

the whole firmware is much larger and is given by dlp-design. I use a dlp
software to upload the firmware to the PIC and all is working fine except
the ADC values.
which internal registers can I test to evaluate whether the A/D converter is
ruined?

please give me some feedback or personal opinion like: "buy a new one!!!"

regards 

Nuno Lucas (Portuguese student)
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