blinking basic

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- 1st February 2009, 21:01
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blinking basic

Hi, i have been recently given a old computer which came with some programming tools. a pickit 2 and a 44 pin demo board PIC16f887 -i/pt.

i loaded up the lessons hex files for the board which were made in asm and had a little muck about with the leds, switch and dial.

from lesson one i manged to change which led lit up buy changing the values of the TRISD,0 PORTD,0 from the lesson below

#include <p16F887.inc>
__CONFIG _CONFIG1, _LVP_OFF & _FCMEN_OFF & _IESO_OFF & _BOR_OFF & _CPD_OFF & _CP_OFF & _MCLRE_OFF & _PWRTE_ON & _WDT_OFF & _INTRC_OSC_NOCLKOUT
__CONFIG _CONFIG2, _WRT_OFF & _BOR21V

org 0
Start:
bsf STATUS,RP0 ; select Register Bank 1
bcf TRISD,0 ; make IO Pin RD0 an output
bcf STATUS,RP0 ; back to Register Bank 0
bsf PORTD,0 ; turn on LED RD0 (DS0)
goto $ ; wait here
end

the person who gave me the computer told me to use microcode studio with the picbasic language as it will be a easy place to start.

i found this blink guide on this forum

define osc 4
OSCCON = %01100001
PORTD = 0
TRISD = 0
loop: PORTD.0 = 1 ' Turn on LED connected to PORTD.0
Pause 500 ' Delay for .5 seconds

PORTD.0 = 0 ' Turn off LED connected to PORTD.0
Pause 500 ' Delay for .5 seconds

Goto loop ' Go back to loop and blink LED forever
End

so i pasted it into microcode studio and built the hex but when loading it into pickit2 programmer it gives a warning about some configuration words not being in the hex, i still pressed write and it seems to work =)

i was wandering where i should begin all the information i found on the net seems to be for older PICs and im a bit lost. assembly seems confusing and i was wondering if anyone knows where a good place to start picbasic would be considering the only programming i have done was on a C64 print goto run etc. =/

well thats all i can think of now hehe but i guess i can read the info i was given.

all help will be apricatied

thank you :)
- 1st February 2009, 21:24
mister_e

Try this

Code:

@ DEVICE INTRC_OSC_NOCLKOUT, WDT_OFF,PWRT_ON,MCLR_OFF @ DEVICE PROTECT_OFF, CPD_OFF,BOD_OFF @ DEVICE IESO_OFF, FCMEN_OFF,LVP_OFF @ DEVICE2 BOR21V, WRT_OFF DEFINE OSC 4 OSCCON = %01100001 PORTD = 0 TRISD = 0 loop: PORTD.0 = 1 ' Turn on LED connected to PORTD.0 Pause 500 ' Delay for .5 seconds PORTD.0 = 0 ' Turn off LED connected to PORTD.0 Pause 500 ' Delay for .5 seconds Goto loop ' Go back to loop and blink LED forever End

Also, have a look at this link.
http://www.picbasic.co.uk/forum/showthread.php?t=543

HTH
- 1st February 2009, 21:32
mister_e

If you use MPASM as assembler, you can use the line in your ASM code at the top, but still followi the instruction in post #5 i Posted above.

Code:

@ __CONFIG _CONFIG1, _LVP_OFF & _FCMEN_OFF & _IESO_OFF & _BOR_OFF & _CPD_OFF & _CP_OFF & _MCLRE_OFF & _PWRTE_ON & _WDT_OFF & _INTRC_OSC_NOCLKOUT @ __CONFIG _CONFIG2, _WRT_OFF & _BOR21V
- 1st February 2009, 21:39
loyalty_card

1 Attachment(s)

Quote:

Originally Posted by mister_e

Try this

Code:

@ DEVICE INTRC_OSC_NOCLKOUT, WDT_OFF,PWRT_ON,MCLR_OFF @ DEVICE PROTECT_OFF, CPD_OFF,BOD_OFF @ DEVICE IESO_OFF, FCMEN_OFF,LVP_OFF @ DEVICE2 BOR21V, WRT_OFF DEFINE OSC 4 OSCCON = %01100001 PORTD = 0 TRISD = 0 loop: PORTD.0 = 1 ' Turn on LED connected to PORTD.0 Pause 500 ' Delay for .5 seconds PORTD.0 = 0 ' Turn off LED connected to PORTD.0 Pause 500 ' Delay for .5 seconds Goto loop ' Go back to loop and blink LED forever End

Also, have a look at this link.
http://www.picbasic.co.uk/forum/showthread.php?t=543

HTH

thanks i have read a little about configs but still unclear i guess the link will explain more also i pasted your code had the same error as before but code works fine, also this popped up while building

also forgot to mention this is all new to me i haven't created my own code yet i don't know what the variables, configs and commands are and what they can do for any PIC let alone my 44 16f887 demo board ;x
- 1st February 2009, 21:55
mister_e

The error you have is because you're using MASm as assembler, so just replace all @ DEVICE line with those i've posted one post before.
- 1st February 2009, 22:13
loyalty_card

Quote:

Originally Posted by mister_e

The error you have is because you're using MASm as assembler, so just replace all @ DEVICE line with those i've posted one post before.

thank you for making the code look tidy

but i still get an warning error in the programmer and now only 1 error after building

error[118] projectpath.asm 52: overwriting previous address contents (2007)

Code:

@ __CONFIG _CONFIG1, _LVP_OFF & _FCMEN_OFF & _IESO_OFF & _BOR_OFF & _CPD_OFF & _CP_OFF & _MCLRE_OFF & _PWRTE_ON & _WDT_OFF & _INTRC_OSC_NOCLKOUT @ __CONFIG _CONFIG2, _WRT_OFF & _BOR21V DEFINE OSC 4 OSCCON = %01100001 PORTD = 0 TRISD = 0 loop: PORTD.0 = 1 ' Turn on LED connected to PORTD.0 Pause 500 ' Delay for .5 seconds PORTD.0 = 0 ' Turn off LED connected to PORTD.0 Pause 500 ' Delay for .5 seconds Goto loop ' Go back to loop and blink LED forever End

so using picbasic still uses asm code? my compiler is set c:/pbp shall i uncheck the use mpasm assembly

also im thinking to order this book ;o

30 Projects Using PIC BASIC and PIC BASIC PRO
- 1st February 2009, 22:21
mister_e

As I said go to this link
http://www.picbasic.co.uk/forum/showthread.php?t=543

Look post #5

And no, don't switch to PM assembler, it just don't worth it.

You'll see it's pretty easy once you catch it.
- 1st February 2009, 22:34
loyalty_card

thanks you have been helpfull i will post again when i have something cool to show =)
- 11th February 2009, 06:10
nomad

and another person hooked on pics
- 11th February 2009, 15:03
RussMartin

Quote:

Originally Posted by nomad

and another person hooked on pics

Which is a heck of a lot better than . . . being picked, on hooks.