Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Switch not turning on?

Status
Not open for further replies.
Hey there,

I'm now learning how to use the ports as the inputs, and I bumped into a small problem there, the switch is not working. The switch, when I hold it, it's permenantly on, and when I release it, it's off. Just a simple one.

Here's the code: (I took some of them from the PICKit II tutorials since I have the training board)

Code:
#include <p16F690.inc>
     __config (_INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_OFF & _MCLRE_OFF & _CP_OFF & _BOR_OFF & _IESO_OFF & _FCMEN_OFF)
     org 0x00
cblock 0x20
count1
count2
count3
display
endc

bsf        STATUS,RP0

movwf    b'11111111'
movwf    TRISA

clrf    TRISC
movlw    b'00000000'
movwf    TRISC

bcf        STATUS,RP0

bsf        STATUS,RP1

movlw    0xF7
movwf    ANSEL

bcf        STATUS,RP0

bcf        STATUS,RP1

movlw   0x01
movwf   display

Start:
btfss    PORTA,3
call    TurnOnLED
goto    Start

TurnOnLED:
movlw    b'00001111'
movwf    PORTC

Delay
        movlw    D'3'
        movwf    count3
        movlw    D'138'
        movwf    count2
        movlw    D'86'
        movwf    count1
Delay_0    
        decfsz    count1,1
        goto    $-1
        decfsz    count2,1
        goto    $-3
        decfsz    count3,1
        goto    $-5
        retlw    0
end

The push-button switch is RA3. I have accessed the TRISC, put them all to ones, but it's still not working the way it should. :confused:
 
hi,
Look at the 690 datasheet for RA3... check for pullup etc.:)
 

Attachments

  • esp01 Nov. 03.gif
    esp01 Nov. 03.gif
    17.6 KB · Views: 159
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top