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Vovachess
Joined: 15 Mar 2004
Posts: 33
Location: Swiss
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| Problem with I/O |
 Posted: Tue Oct 04, 2005 8:49 am |
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I use code below to just turn 3 pins on and off. With this code works only PIN2. Pin0, and PIN1 dont change their states from low to high and visaversa. Whats wrong....
| Code: |
#include <10F206.h>
#fuses NOMCLR,NOPROTECT,NOWDT
#ROM 0x2007 = {0x0FFB}//----------------------------------------------------------------------Configuration bit
#use delay(clock=4000000)//-------------------------oscilator 4MHZ
//PORT_B_PULLUPS(TRUE);
#use fast_io(B)
#byte GPIO=0x06
#bit CMPOUT=0x07.7//-------------------------------comp output
#bit COUTEN=0x07.6//-------------------------------comp output disable
#bit CMPON=0x07.3//--------------------------------comp enable
#bit CNREF=0x07.2//--------------------------------comp negative voltage ref
#bit CPREF=0x07.1//--------------------------------comp positive voltage ref
#bit CWU=0x07.0//----------------------------------comp weak up on change
#bit GP0=0x06.0//----------------------------------PIN 0
#bit GP1=0x06.1//----------------------------------PIN 1
#bit GP2=0x06.2//----------------------------------PIN 2
#bit GP3=0x06.3//----------------------------------PIN 3
void main() {
#ASM
// pin3=input, pin0,1,2=output
MOVLW 0x08
TRIS GPIO
// Disable wake-up on pin change, enable weak pull-ups,
// Timer0 source internal, L to H
// Prescaler to WDT, max division 2304mS
movlw 0x8F
OPTION
#ENDASM
while (true) {//-----------------------------------loop forever
output_low(PIN_B2);//--------------------------mess switch on
output_low(PIN_B1);//--------------------------mess switch on
output_low(PIN_B0);//--------------------------mess switch on
delay_ms(3000);//---30 sec delay
output_high(PIN_B2);//--------------------------mess switch on
output_high(PIN_B1);//--------------------------mess switch on
output_high(PIN_B0);//--------------------------mess switch on
delay_ms(3000);//---30 sec delay
} // end of while (TRUE)
} //end of main |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Oct 04, 2005 9:48 am |
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Read the data sheet for the 10F206. Look at the pin diagram
for the chip. What functions are available on the GP0 and GP1
pins besides i/o ? What module are those functions in ?
What register controls that module ? Is there a bit in that
register to enable or disable the module ? What is the power-up
default state of that bit ? If it's enabled, then put in a line
of code at the start of your program to write to that bit and
disable the module. |
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Felix Althaus
Joined: 09 Sep 2003
Posts: 67
Location: Winterthur, Switzerland
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| Posted: Tue Oct 04, 2005 9:49 am |
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Hello
GP0 and GP1 are the comparator inputs. I think you have to first switch off the comparator module to use this pins as I/O.
Happens to me with a PIC12F675...
@ PCM Programmer: I'm sorry I screwed up your pedagogical lesson :-)
mfg
Felix |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Tue Oct 04, 2005 9:55 am |
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I hate it when other people anwer the question I was just looking into. 
Just so I feel I didn't completely waste my time I will give my answer too.
Look at table 5.1 in the datasheet and you will see the comparator sharing the same I/O pins has a higher priority in order of pin function assignment. By default the comparator is enabled. Disable the comparator by adding the command setup_comparators(NC_NC) in the top of your main function. |
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Vovachess
Joined: 15 Mar 2004
Posts: 33
Location: Swiss
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| Posted: Tue Oct 04, 2005 10:21 am |
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Thanks ckielstra  |
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