code not read by compiler

[press9761]

Hello

I see the compiler is not reading some of my code. I think this has to do with code optimization however,..I'm not sure.
I made a small function that sets some register bits. I saved that function (called config) as a .H file and included it into the project.
When I run the code, I see the simulator skips right over it. When testing it, I see it doesn't work. When I place the same instructions in my
main function it works.

Let me show you what I mean

Code: Select all

sbit  ack_led at portc.b0;              // make an alias for the led_ack pin
#include "config_sys.h"
void main() {
      config();
    while(1){
      delay_ms(500);
      ack_led=1;
      delay_ms(500);
      ack_led=0;
    }
}

In the function "config()" this is contained:

Code: Select all

void config(void){
 //set up system clock to run at 8 Mhz
////////////////////////////////////////////////////////////////////////////////
 OSCCON.b6=1;
 OSCCON.b5=1;
 OSCCON.b4=0;  //8mhz
 OSCCON.b1=1;
////////////////////////////////////////////////////////////////////////////////
ANSEL.AN4=1;
TRISC.TRISC0=0;
return;
}

I can see in the simulator that all the code in "config()" is skipped right over.
When I run the code,...it doesn't work.

However, when I place the instructions found in "config()" in the main() function I can see the
simulator reads the instructions I can also see that it works when I test it on the actual chip.

Let me show you what I mean:
(this code works fine)

Code: Select all

sbit  ack_led at portc.b0;              // make an alias for the led_ack pin
#include "config_sys.h"
void main() {
config(); 
//set up system clock to run at 8 Mhz
////////////////////////////////////////////////////////////////////////////////
 OSCCON.b6=1;
 OSCCON.b5=1;
 OSCCON.b4=0;  //8mhz
 OSCCON.b1=1;
////////////////////////////////////////////////////////////////////////////////
 ANSEL.AN4=1;
 TRISC.TRISC0=0;
 while(1){

  delay_ms(500);
  ack_led=1;
  delay_ms(500);
  ack_led=0;
  }

Just like in the previous code, all the instructions in "config" are skipped.
However, the same instructions are fallowed in main().

My questions is why is this happening???
How can I know when this is going to happen??
What can I do to avoid this??

I have seen this before in more complicated code. It's hard to debug your code when instructions are not being fallowed.
What an I doing wrong?

I have other config files that I use, they include many more instructions, they compile fine. Why?


Thank you

JP

[slavisa.zlatanovic]

Hi!

Please, create a minimal project which depicts the issue you're talking about and send it to me.
slavisa.zlatanovic@mikroe.com
I'll try to reproduce it and suggest further steps.
Also, tell me which compiler version are you using?
Thanks!