RESET Problem

Calebjo

For some reason this has happened for the first time. The programs in one of my program folders just had issues with the RESET···· Main command. it says "Redefinition of symbol 'RESET'" and "The symbol <Main> is not defined." Does anyone have an idea why it is doing this??? this just happened to half of my programs in one of my folders but every where else it works fine.

Post Edited By Moderator (Bean (Hitt Consulting)) : 11/20/2008 1:37:34 PM GMT

Bean

If you could post the entire program, we might be able to help.

Bean.

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Calebjo

Nevermind I retyped all of the programs and for some reason they all work fine now.Must be a·noob mistake or something.·I am now trying to figure out how to turn pins into input; basically just connect them the ground. My programs aren't turning the appropriate pins to gnd so i am all confused. Attached is one of my first programs where I am trying to·find out how to connect the pins to ground. My assembly language "vocabulary" isn't quite expanded so any help is appreciated.

Calebjo

PJMonty

Calebjo,

Making a pin an input and connecting a pin to ground are not the same thing. When a pin is an output, you can set it high or low. When high, it sources the power supply voltage, when low it is connected to ground. If you turn a pin into an input, it goes into Hi-Z mode which means it is floating and not connected to anything.

Thanks,
PeterM

Calebjo

PeterM,

Thank you for clarifying that for me. How would you instruct the SX to set that output pin to high or low? What would the progam code be for that?
Thanks for your consideration,
Calebjo

PJMonty

Calebjo,

Here is a sample program that sets various pins of Port A as outputs and lets you set them high or low.

Thanks,
PeterM

ifdef __SASM
        DEVICE SX28, turbo, stackx, optionx, OSCHS3 ; Un-comment for SX28 chip
        ;DEVICE SX48, OSCHS3 ; Un-comment for SX48 chip
else
        DEVICE SX28L,turbo,stackx_optionx
endif
        FREQ    50_000_000
        RESET   InitSx            ;Set reset/boot address

ifdef __SASM
        LIST Q=37;, Q=64 ; This quiets specfic SASM warnings
        irc_cal IRC_FAST
endif

; Control register equates
DIR        equ    $0f

InitSx

org $0

; Get SX ready for setting port pin direction
mode    DIR            ; set input/output states

; These are samples of setting different pin(s) as outputs
mov    !ra, #%11111110        ;Set PortA pin 0 as output
mov    !ra, #%11111101        ;Set PortA pin 1 as output
mov    !ra, #%11110110        ;Set PortA pins 3 and 0 as output
jmp @Main

; Everything above this line only needs to be done once in program

; Now you can set port pins high or low

org $200
Main

mov ra, #%11111111        ; Port A, all pins high
mov ra, #%11111110        ; Port A, pin 0 low
mov ra, #%11110110        ; Port A, pins 0 and 3 low

jmp Main

Calebjo

PeterM,

Thanks for the sample program and clearing the high and low up for me! Now i can actually connect things to ground instead of turning them to Hi-z state. Thanks again!
Calebjo