PIC Projects A Practical Approach (C, Assembly Based)

Naver

[pic 16f84]

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Page 73

PIC12F629 - Flashing LED with a push button - C program

#include<pic12f6x.h>

void delay (void)

{

int j;

for(j=0; j<300; j++)

}

void main(void)

{

TRIS1 = 0;    //set port pin 1 to output

TRIS4 = 1;    //set port pin 4 to input

while(1)

{

if(GPIO4==1)    //is the push button pressed ??

{

GPIO1==1    //port pin 1 is HIGH

delay();        //short delay

GPIO1==0    //port pin is LOW

delay();        //short delay

}

}

}

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Page 74

PIC12F629 - Flashing LED with a push button - assembly program

;SW_LED_12F629.asm

include "p12f629.inc"

;global variables

T1    equ    26h

T2    equ    27h

T3    equ    28h

Main     bsf    STATUS,5    ;select bank for TRISIO

;http://what-when-how.com/pic-microcontroller/the-pic16f84-microcontroller-part-2/

movlw    B'11111101'    ;Set GPIO1 as Output, rest of them as Inputs 

movwf    TRISIO            ;set GPIO1 as output

bcf        STATUS,5        ;select bank0

again    btfss       GPIO,GP4        ;is the push button pressed? (if Yes, skip next line)

goto        again            ;not pressed, read again

bsf         GPIO,GP1        ;set GPIO1 pin to 1

call         Delay             ;call Delay method

bcf        GPIO,GP1         ;reset GPIO1 pin to 0

call        Delay              ;call Delay method

goto        again            ;Back to again "again" Label

; Delay 0.5 sec

Delay    movlw    3                    ; load values "3"

movwf    T1                  ; T1 = 3 (변수 T1에 3을 담는다.)

movlw    0EBh                ; 14*16 + 11 = 235

; E is 14 in Hex, B is 11 in Hex

; LSB is 16^0, 16^1, 16^2 ... (getting up going to MSB)

; 0*16^2 + E*16^1 + B*16^0

DelT1    movwf    T2                   ;T2 = 235

DelT2    movwf    T3                    ;T3 = 235

DelT3    decfsz    T3,1                  ;T3=T3-1, repeat not 0

 ; decfsz : Decrease File, Skip if it is Zero

goto     DelT3

decfsz    T2,1                  ;T2=T2-1, Decrease T2 by 1 (1씩 감소)

goto     DelT2

decfsz    T1,1                    ;Decrease T1 by 1

goto     DelT1

return

;

end

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