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MPLAB SIM error

 
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PrinceNai



Joined: 31 Oct 2016
Posts: 452
Location: Montenegro

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MPLAB SIM error
PostPosted: Fri Jun 17, 2022 9:57 am     Reply with quote

Hi all,
I've been toying with MPLAB SIM in MPLAB 8.92 using the code for Olympic averaging of A/D signal with 18f46k22. No matter which analog input I choose, I get this warning:

ADC-W0012: Selected channel 0 is an invalid channel. What is MPLAB trying to tell with this? Which channel would be valid?

I hardly ever use a simulator and imaginary stimulus, this is from curiosity only.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Jun 17, 2022 10:30 am     Reply with quote

Post a short test program that compiles.

Post your compiler version.

Post details on how you are doing the stimulus.

Confirm that you have 18F46K22 selected in MPLAB's Configure menu.
PrinceNai



Joined: 31 Oct 2016
Posts: 452
Location: Montenegro

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PostPosted: Fri Jun 17, 2022 10:43 am     Reply with quote

main:
Code:

#include <main.h>

int16 MyADC = 0;

#INT_TIMER0
void  TIMER0_isr(void)
{
}

// *********************************************

// olympic++  adc de-noising routine for 10 or 12 bit ADC values
// NOTE: you must have selected the desired ADC channel before calling
// reads 16x , sorts and tosses low4 && high 4 readings
// then averages the middle 8

unsigned int16 adchlx(void){  // read 16 - sort, keep middle 8 average

 unsigned int8 i;  unsigned int16 accum=0;
 unsigned int16 s, b[16]; int1 didswap=1;

   for ( i = 0 ; i < 16;  i++ ) {
           b[i]= read_adc(); // ADC set for 10 or 12 bits
           delay_us(8);
     } //    end of for loop for multi sample
   while(didswap){  // bubble sort
     didswap=0;
     for (i=0; i<15; i++){ // i 0-15
      if(b[(i)]>b[(i+1)]){ // if low element greater than next  -do  swap
           s=b[i]; // hold upper
           b[i]=b[(1+i)];
           b[(1+i)]=s;
           didswap=1;
      } // ~if
     } // ~for
    } // ~while
   // now sort and keep middle 8 values
   for (i=4; i<12; i++){  accum +=b[i];  }
   return(accum>>3);
}

// *********************************************
void main()
{
 
   setup_adc(ADC_CLOCK_INTERNAL);   //
   setup_adc_ports(sAN0);
   set_adc_channel(0);                //read from channel 0

   enable_interrupts(INT_TIMER0);
   enable_interrupts(GLOBAL);

   while(TRUE)
   {

      MyADC = adchlx();
      delay_cycles(1);
      delay_ms(500);
 
   }

}


h:
Code:

#include <18F46K22.h>
#device ADC=10

#FUSES NOWDT                    //No Watch Dog Timer

#device ICD=TRUE
#use delay(internal=32000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=PORT1,errors)


Device in MPLAB is ok, but I saw yellow circle regarding the ability to simulate this chip. As for the stimulus I tried two variants, simply setting AN0 to "high" and also some file I found on the net.


The code breaks here: b[i]= read_adc(); // ADC set for 10 or 12 bits


Code:

NOT CCS!!!!
   # process to continuously inject 0 to 5 V on AN0 in 0.1 V increments every 1 ms
   process InjectADCPin is
      begin
         loop
            AN0 <= 0 mv;
            loop
               wait for 1 ms;
               AN0 <= AN0 + 100 mv;
               if AN0 > 5000 mv then
                  exit loop;
               end if;
            end loop;
         end loop;


The code compiles without any warning, version 5.104. MPLAB SIM throws that back.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Jun 17, 2022 11:37 am     Reply with quote

I made a very small test program and got the same ADC-W0012 error.
Then I changed the PIC to 18F4620 and it didn't show that error.
So it's the yellow dot on MPLAB SIM. There isn't full support for 18F46K22.

As a work-around, I suggest you substitute a constant for the stimulus file.
ie., don't use stimulus. Example:
Quote:
#include <18F46K22.h>
#device ADC=10
#FUSES NOWDT //No Watch Dog Timer
#device ICD=TRUE
#use delay(internal=32000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=PORT1,errors)

int16 MyADC = 0;

#define ADC_VALUE 1023 // *** FOR TESTING ***



and
Quote:

unsigned int16 adchlx(void){ // read 16 - sort, keep middle 8 average

unsigned int8 i; unsigned int16 accum=0;
unsigned int16 s, b[16]; int1 didswap=1;

for ( i = 0 ; i < 16; i++ ) {
b[i]= ADC_VALUE; // *** FOR TESTING ***
delay_us(8);
} // end of for loop for multi sample
while(didswap){ // bubble sort
didswap=0;
for (i=0; i<15; i++){ // i 0-15
if(b[(i)]>b[(i+1)]){ // if low element greater than next -do swap
s=b[i]; // hold upper
b[i]=b[(1+i)];
b[(1+i)]=s;
didswap=1;
} // ~if
} // ~for
} // ~while
// now sort and keep middle 8 values
for (i=4; i<12; i++){ accum +=b[i]; }
return(accum>>3);
}
PrinceNai



Joined: 31 Oct 2016
Posts: 452
Location: Montenegro

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PostPosted: Fri Jun 17, 2022 2:29 pm     Reply with quote

Thanks a lot for the answers.

Regards,
Samo
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