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"Counting loop" in Interrupt subroutine doesn't wo

 
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SophE
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"Counting loop" in Interrupt subroutine doesn't wo
PostPosted: Wed Mar 22, 2006 10:43 am     Reply with quote
The following interrupt SR works. I push a button, code goes into the following, it executes and returns to main(). The second code (posted below) stays in the ISR forever after button push. Is there some reason why counting loops within ISRs don't work?
This link is to my previous post and shows the main() routine.
http://www.ccsinfo.com/forum/viewtopic.php?t=26437
Thanks to everyone in this forum for being so helpful,
Sophi
Code:

#INT_COMP
comp_isr(){
    int reg_read;
    int data, i;
    int count =0;
    delay_ms(25);  //debounce
    printf(lcd_putc,"\fInterrupt loop ");
    delay_ms(500);
    i2c_start();
    i2c_write(0xA0);              // control bits
    i2c_write(0x00);              // address of eeprom #1
    i2c_write(0x00);
    i2c_start();
    i2c_write(0xA1);              //Sequential read
    printf(lcd_putc,"\nBegin Read           ");         
      data = i2c_read();
      portb = data;
      delay_us(15);     
      delay_ms(50);       
      i2c_stop();
      reg_read = CMCON;
    }

This is the second code that stays there forever...: BTW I have tried the counting loop with "for(i=0;i<30000;a++)" and various forms of while counting loops as well.... I'm sure its something stupid....

Code:
#INT_COMP
comp_isr(){
    int reg_read;
    int data, i;
    int count =0;
    delay_ms(25);  //debounce
    printf(lcd_putc,"\fInterrupt loop ");
    delay_ms(500);
    i2c_start();
    i2c_write(0xA0);              // control bits
    i2c_write(0x00);              // address of eeprom #1
    i2c_write(0x00);
    i2c_start();
    i2c_write(0xA1);              //Sequential read
    printf(lcd_putc,"\nBegin Read           ");
    do{
      count++;
      data = i2c_read();
      portb = data;
      delay_us(15);
      printf(lcd_putc,"\ncount = %5.0d", count);
      delay_ms(50);   
      }while(count <= 500);
      i2c_stop();
      reg_read = CMCON;
    }[/url]
Ttelmah
Guest
PostPosted: Wed Mar 22, 2006 11:04 am     Reply with quote
Hint.
What can an integer 'hold' in CCS C?...

Best Wishes[/b]
Sophi



Joined: 14 Jun 2005
Posts: 64

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PostPosted: Wed Mar 22, 2006 11:36 am     Reply with quote
Embarassed
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