Pic16f88

[nonny]

Dear experts,

I am new to this programing. I have a small project which i would like to get help with. Its a small car which should turn ON the lights and turn OFF with two buttons.

Please help me.

Thanks

[mister_e]

Hi and welcome.

try the following

'
' Pic Configuration
' =================
ASM
IFNDEF PM_USED
list w=-207
; Program Configuration Register 1
cfg1 = _INTRC_IO & _WDT_OFF & _PWRTE_ON & _MCLR_OFF & _BODEN_ON & _LVP_OFF & _CCP1_RB0
cfg2 = _CP_OFF & _CPD_OFF & _WRT_PROTECT_OFF & _DEBUG_OFF
__CONFIG _CONFIG1, cfg1 & cfg2

; Program Configuration Register 2
__CONFIG _CONFIG2, _IESO_OFF & _FCMEN_OFF
list w=+207
ELSE
device INTRC_OSC_NOCLKOUT, WDT_OFF, PWRT_ON, MCLR_OFF, BOD_ON, LVP_OFF, CCPMX_OFF
device PROTECT_OFF, CPD_OFF, WRT_OFF, DEBUG_OFF
device2 FCMEN_OFF, IESO_OFF
ENDIF
ENDASM
OSCCON = %01100000 ' set to 4 MHz clock

'
' Hardware configuration
' ======================
TRISB=0 ' Set all PORTB pins to output
TRISA=255 ' Set all PORTA pins to output
ANSEL = 0 ' disable adc converters
CMCON=7 ' disable analog comparator

'
' Hardware assignment
' ===================
'
' Push buttons
' ------------
' Push buttons are connected between PIC i/o and gnd
' don't forget to add a pull-up resistor on the i/o too
'
ONButton VAR PORTA.0
OFFButton VAR PORTA.1
'
' Light
' -----
' LED connect between I/O and gnd... with a resistor in serie
'
LIGHT VAR PORTB.0

'
' Hardware initialisation
' =======================
WHILE OSCCON.2=0 : WEND ' wait 'till internal OSC is stable
PORTB=0 ' clear all PORTB i/o

START:
if ONButton = 0 then
light = 1 ' turn the LED on
endif

if offbutton = 0 then
light = 0 ' turn the led off
endif

GOTO START

[nonny]

thanks a lot, question! the above configs. can be done in the software as well right so i dont need to do those in the coding??

[mister_e]

yes you can do it in your programmer software as well... but you need to set them each time... and remind which one you need to set. Kinda annoying if months/years later you need to reprogram a PIC and you don't remind them.

Once you load the .HEX file to program your PIC, your PIC Programmer software have to be smart enough to refresh the default one and to program them. Careful, some software need to be warned to do so.

I ALWAYS set them in code, it's the right place to fit them.. not in a README.TXT or on a piece of paper sticked somewhere.

But it's me ;)

EDIT: the above are way to much, but as i didn't know which assembler you're using (PM/MPASM) i've just put both and let the compiler choose for you. See the FAQ for more details.

[nonny]

thanks a lot, I will try it out and let you know. another thing forgot to ask. will it work for 4 LEDs or two? e.g. two front two rear...

[nonny]

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