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Problems with a Botrics board running a simple program
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JesseWelling:
OK so I just got my Botrics board which runs a PIC 16F877A.
I ran their test program that makes the LEDs flash back and forth.
But now I wanted to write my own test for it. The idea is to have both LEDs out till you press one of the buttons.
After you press one of the buttons, the corresponding light should go on. *BUT* nothing happens.
Here is my .ASM
--- Quote ---LIST P=16f877, R=DEC
INCLUDE "P16F877A.inc"
;variables
ScratchPad EQU 0x20
;literal constants defined for cerebellum
board_button1 EQU 4
board_button2 EQU 5
board_LED1 EQU 0
board_LED2 EQU 2
ORG 0x03
goto start
ORG 0x50
start
bsf STATUS, RP0
movlw b'00001100'
movwf TRISB
bcf OPTION_REG, 7
bcf STATUS, RP0
movlw 0x00
movwf PORTB
testloop
btfsc PORTB, board_button1
bsf PORTB, board_LED1
btfsc PORTB, board_button2
bsf PORTB, board_LED2
goto testloop
END
--- End quote ---
and here is my .HEX
--- Quote ---:02000600502880
:04000A00003400348A
:1000A00083160C3086008113831200308600061AF6
:0800B0000614861A06155728F4
:00000001FF
--- End quote ---
SO....am I not setting up the Linker correctly in MP-LAB or am i not programing the pic correctly with regards to the input and output from PORTB ??? and how do you code interupts BTW? I'm kinda flying by the seat of my pants here, so sorry for the request for massive amounts of info here.
Reference to Cerebellum site http://www.botrics.com/support/cereb/manual/chapter3/3-7-user-devs.html
JesseWelling:
*BUMP*
so ummm am I the only one silly enough to program in assembly and that's why no one is helping me out? :-\
Admin:
hehe yeap :P
Any reason you cannot do it in C?
JesseWelling:
class requirement :-[
But that's ok I figured it out.
--- Quote ---bcf OPTION_REG, 7
--- End quote ---
enables weak pull ups on PORTB using internal resistors.
But it makes ALL of PORTB an input.
BUT my board has resistors already so I don't need a weak pull up so if I erase that line it works fine
And I had my TRISB MSB and LSB backwards because I didn't read my data sheet closely enough.
:P :P :P
But thanks for responding. I thought I smelled or something.
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