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problem with structs and interrupts

 
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andreluizeng



Joined: 04 Apr 2006
Posts: 117
Location: Brasil

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problem with structs and interrupts
PostPosted: Tue May 02, 2006 2:37 pm     Reply with quote
Hello people..

I was working on a software that needed to count the real time (RTC Software), so i was using structs and i have many problems with this.

the structs were like (for example):

Code:


struct TTime
{
      unsigned int Seg;
      unsigned int Min;
      unsigned int Hour;
};

struct TAlarm
{
       struct TTime Time;
       boolean AlarmFlag;
};

struct TClock
{
      struct TTime Time;
};


struct TAlarm Alarm;
struct TClock Clock;


i was counting the time using Timer0 interrupt on overflow, and everytime that i changed the value of Clock or Alarm's time (Clock.Time.Min or Alarm.Time.Hour) Timer0 stops to counting and my program becomes crazy.. whats the problem with that ? i wouldnt use the same Name of one type of struct on diferents structs ??

like struct TTime Time in both struct TAlarm and TClock ?

and i was having another problem with local variables. i wrote a menu function to work with lcd display and my function returns a value of a choice.

if i declares the variable that will take this value and return it from the function its value is lost. It just work if i use this variable like a global variable.

so, that is it...

hope to someone has answers for these questions..

regards.
_________________
Andre
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue May 02, 2006 3:09 pm     Reply with quote
Can you post a small test program that shows the problem ?
Post a complete program that can be copied and pasted into MPLAB
and compiled with no errors. It must have all the necessary
#include, #use, and #fuses statements. Make the program be
very short -- a maximum of 50 lines. Use a printf statement
to display the problem. Indicate the line of code that you think
is causing the problem with a comment.

Also post your compiler version. You can find the version number
at the top of the .LST file for your project. The .LST file is in your
project directory. The version will be a number like 3.191 or 3.249, etc.
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