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16F690 Problem

 
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erkankocakaya
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16F690 Problem
PostPosted: Thu Feb 22, 2007 8:22 am     Reply with quote
My problem is I cant use PIN_C0 and PIN_C1 same time

my compiler 3.249 .what is wrong or missing in this program.Help me please

Code:


void main()
{


do {


OUTPUT_HIGH(PIN_C0);
OUTPUT_HIGH(PIN_C1);
       
delay_ms(2000);
OUTPUT_LOW(PIN_C0);
OUTPUT_LOW(PIN_C1);
delay_ms(2000);
 
}while(true);
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Thu Feb 22, 2007 9:37 am     Reply with quote
Which PIC processor are you using? Odds are it is a PIC16 with the famous "read, modify, write" problem. Use the search function of this forum to get more info on this issue.

Try the program below, if it works you can be sure it is the RMW problem.
Code:
void main()
{
  do
  {
    OUTPUT_HIGH(PIN_C0);
    delay_ms(100);
    OUTPUT_HIGH(PIN_C1);
    delay_ms(2000);

    OUTPUT_LOW(PIN_C0);
    delay_ms(100);
    OUTPUT_LOW(PIN_C1);
    delay_ms(2000);
  }while(true);
}
erkankocakaya
Guest
Thanks
PostPosted: Thu Feb 22, 2007 1:36 pm     Reply with quote
PIC 16F690 I am using.When I use below code C0 and C1 pins dont high
only B4 and B6 light the leds

Why do you think?

Code:


main()
{
OUTPUT_HIGH(PIN_C0)
delay_ms(250);
OUTPUT_HIGH(PIN_C0)
delay_ms(250);
OUTPUT_HIGH(PIN_C1)
delay_ms(250);
OUTPUT_HIGH(PIN_C1)
delay_ms(250);
OUTPUT_HIGH(PIN_B4)
delay_ms(250);
OUTPUT_HIGH(PIN_B4)
delay_ms(250);
OUTPUT_HIGH(PIN_B6)
delay_ms(250);
OUTPUT_HIGH(PIN_B6)
delay_ms(250);
}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Feb 22, 2007 11:56 pm     Reply with quote
There's a bug in the startup code for the 16F690 in PCM vs. 3.249.
Comparator #2 is turned on by mistake. That's why pins C0 and C1
don't work. You can fix this by adding the line of code shown in bold
below, at the start of your program:
Quote:

void main()
{
setup_comparator(NC_NC_NC_NC);


while(1);
}
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