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Mike M
Guest
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| Trouble with simple I/O on pic16f88 |
 Posted: Fri Mar 14, 2008 3:23 am |
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Hi,
I´m newbie in programming pics, and I´m having some trouble with a pic16f88. As a first test, I wanted to see if I could make output pins in diferent ports toggle high and low.
What I have noticed is that everything works fine in portB but it does nothing on portA. I´m using an external cristal oscilator on ports A7 and A6, can this be the problem?
The version of the complier is 4.016.
Thanks for your help |
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Foppie
Joined: 16 Sep 2005
Posts: 138
Location: The Netherlands
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| Posted: Fri Mar 14, 2008 3:34 am |
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first: can you post your simple test program? The guys here can give you more useful hints and tips when they see your code.
second: the compiler v4.016 is known to be buggy, in fact all compiler before v4.020. Maybe you can update your compiler? |
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Guest
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| Posted: Fri Mar 14, 2008 4:34 am |
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OK, here´s my code:
| Code: |
#include <16f88.h>
#fuses xt,NOWDT,noput,noprotect,nomclr,NOBROWNOUT,nolvp
#include <ctype.h>
#use DELAY(clock=4000000)
#use fast_IO(A)
main()
{
//port_a_pullups(true);
SETUP_ADC_PORTS(NO_ANALOGS);
SETUP_ADC(ADC_OFF);
set_tris_b(0x00);
output_high(PIN_A0);
output_high(PIN_A1);
output_high(PIN_A2);
//set port b as outputs
while(1)
{
output_low(PIN_A0);
output_low(PIN_B7);
delay_ms(1000);
output_high(PIN_B7);
output_high(PIN_A0);
output_low(PIN_A1);
delay_ms(1000);
output_high(PIN_A1);
output_low(PIN_A2);
delay_ms(1000);
output_high(PIN_A2);
}
}
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So, for portB the pin toggles right but for portA it does nothing.
Thanks |
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Mike M
Guest
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| I solved it! |
| Posted: Fri Mar 14, 2008 5:23 am |
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Finally I solved the problem.
It´s a RMW problem, I fixed it shadowing the port as it says in one of the old posts
Thanks to all! |
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