i'm making my first pic project, with a 12c508a, very simple project wich is:
press a button (in GP3) toogle a led (GP0) while button is pressed and switch on another led on GP4, and when i press GP3 again the toogle the GP1 led also while the button is pressed and turn off GP4 led. the objective is turn on and off a device with 2 buttons with a single button.
the problem is the project doesn't work properly. maybe i can get some help here.
here's the code:
Code: Select all
list p=12c508a
#include <p12c508a.inc>
;*******CONFIG********
__CONFIG _MCLRE_OFF & _CP_OFF & _WDT_OFF & _IntRC_OSC
;*******variables********
TEMP_VAR UDATA 0x07
sGPIO RES 1; shadow copy of GPIO
db_cnt RES 1; debounce counter
dc1 RES 1; delay counter
on RES 1; system on flag
;*******RC cal*******
RCCAL CODE 0x1FF; vector reset processor
RES 1;
;*******VECTOR RESET*******
RESET CODE 0x000; effective reset vector
movwf OSCCAL; factory osc cal
;*******MAIN PROGRAM*******
;*******INIT*******
ini
clrf GPIO; clean out
clrf sGPIO; actualizar shadow reg
movlw b'110100'; config GP0 GP1 GP4 as outputs, GP3 as in
tris GPIO;
movlw b'1011111'; config internal pull-ups ON
option;
;*******PROGRAMA*******
main
clrf on;
clrf dc1;
clrf db_cnt;
;wait button press
db_dn
movlw .26; max count = 20ms/768us = 26
movwf db_cnt;
clrf dc1;
dn_dly
incfsz dc1, f; delay 256x3 = 768us
goto dn_dly;
btfsc GPIO, 3; if button not press (GP3=1)
goto db_dn; reset cont
decfsz db_cnt, f; else repeat to archieve max count
goto dn_dly;
;OUTS
btfss on, 0; test if flag ON/OFF is active
goto liga;
goto desliga;
;OUT "ON" (GP0)
liga
movf sGPIO, w;
xorlw b'001001'; activate bit GP0 (saida on) and GP4 (led)
movwf sGPIO; on shadow reg
movwf GPIO;
bsf on, 0; activate flag ON/OFF
goto db_up;
desliga
movf sGPIO, w;
xorlw b'001010'; activate bit GP1 (out off) and turn GP4 led off
movwf sGPIO;
movwf GPIO;
bcf on, 0; deactivate flag ON/OFF
;wait for button release
db_up
movlw .26; max count = 20ms/768us = 26
movwf db_cnt;
clrf dc1;
up_dly
incfsz dc1, f; delay 256x3 = 768us
goto up_dly;
btfss GPIO, 3; if boton is pressed (GP3=0)
goto db_up; restart count
decfsz db_cnt, f; else repeat until max count is reached
goto up_dly;
;update outs
btfsc on, 0; test flag ON/OFF to know wich bit is on
goto desliga_out;
goto liga_out;
;clean out GP0 or GP1
desliga_out
movf sGPIO, w;
xorlw b'000010';
movwf sGPIO;
movwf GPIO;
goto db_dn;
liga_out
movf sGPIO, w;
xorlw b'000001';
movwf sGPIO;
movwf GPIO;
goto db_dn;
END
sorry for bad english in program wich is written in portuguese.
hope someone can help me.
thanks
