Microcontroller Help: how to program codewarrior ide?

tyr

tyr

@tyr-BTjgRw • Oct 26, 2024
I'm new to the website and having difficulty learning how to program codewarrior ide. we are using assembly language and HCS12 microcontroller.

could anyone help me with some lab related questions?

thanks
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  • Kaustubh Katdare

    Kaustubh Katdare

    @thebigk • Aug 11, 2009

    Thread moved to here.

    Feel free to ask questions and provide as many details you can along with your questions. Be assured that you'll be helped by CEans.
    0
  • tyr

    tyr

    @tyr-BTjgRw • Aug 11, 2009

    thread moved to where??? superblog?
    0
  • debu

    debu

    @debu-62iszV • Aug 11, 2009

    @tyr: Welcome to CE! 😁

    What do you want to know? Shoot away...

    Regards,

    Debu 😀
    0
  • tyr

    tyr

    @tyr-BTjgRw • Aug 11, 2009

    using code warrior....

    ldy #6000
    loop:
    dey
    bne loop


    try embedding this in an outer loop to successively turn an led at port b on and off with a one second period. then embed the wole thing in a continuous loop to run forever.

    second


    use the led flasher code from the other exercise to build a pulse width modulator. the modulator should read a byte from port h and output a pulse to port b with a period of 256 ms and a duty cycle equal to the value of the byte at port h divided by 256


    thanks
    0
  • debu

    debu

    @debu-62iszV • Aug 11, 2009

    @tyr:

    This looks like a homework assignment. Anyway, here:
    ;Blink LED on 0th bit of PORTB    
    ORG 0xF000        ;Beginning of code stack
        Start:
            LDS    #0x0C00        ;Load 0x0C00 to the top of the stack
            CLR    COPCTL        ;Disable COP by making the COPCTL register 0
            BSET PORTB, 0     ;Set bit 0 of PORTBB
            ;Outer loop
            outer:
            ; Your code starts here:
                ldy #6000    ;Load Y with 6000
                loop:
                    dey        ;Decrement Y
                bne loop    ;If y!=0 branch to loop
                ;After wasting 6000 cycles (roughly 1 sec in this case)
                COM PORTB    ;Complement PORTB
            JMP outer        ;Jump to outer
    END
    Now, you should use my code above to make PWM on your own, its really simple.

    Regards,

    Debu 😀
    0