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edited Dec 8, 2014 at 16:46

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.include "/usr/local/include/atmega32u4.def"

.include "/usr/local/include/atmega32u4.def"

        .global  main

        .section .text

main:



main:

        cbi     PortD, 2            ; joystick button
        cbi     PortD, 3            ; right button
        cbi     PortD, 4            ; up button
        cbi     PortD, 5            ; down button
        cbi     PortD, 6            ; left button

        cbi     PortC, 0            ; joystick vertical output
        cbi     PortC, 1            ; joystick horizontal output


        ldi     r16, 0x7c           ; select pins 2-6 for button input mask
        in      ddrd, r16           ; set digital button pins as input
        ldi     r17, 0x03           ; select pins 0 & 1 for joystick input
        in      ddrc, r17           ; set analog joystick pins as input

        ldi     r18, 0x1f           ; select pins 8-12 for button LED output
        out     ddrb, r18           ; set digital button LED pins as output
        ldi     r18, 0x0c           ; select pins 2 & 3 for joystick LED ouput
        out     ddrc, r18           ; set analog joystick LED pins as output

loop:


loop:

        ldi     r20, PortD          ; read in from digital pins 0-7
        and     r20, r16            ; apply button input mask
        mov     r20, r20 >> 2       ; shift left twice
        sts     PortB, r20          ; turn on LEDs of pushed buttons

        ldi     r20, PortC          ; read in from analog pins
        and     r20, r17            ; apply joystick input mask
        mov     r20, r20 >> 2       ; shift left twice
        sts     PortC, r20          ; turn on LEDs of joystick movement
        rjmp    loop

.include "/usr/local/include/atmega32u4.def"

    .global  main

    .section .text

main:

    cbi     PortD, 2            ; joystick button
    cbi     PortD, 3            ; right button
    cbi     PortD, 4            ; up button
    cbi     PortD, 5            ; down button
    cbi     PortD, 6            ; left button

    cbi     PortC, 0            ; joystick vertical output
    cbi     PortC, 1            ; joystick horizontal output


    ldi     r16, 0x7c           ; select pins 2-6 for button input mask
    in      ddrd, r16           ; set digital button pins as input
    ldi     r17, 0x03           ; select pins 0 & 1 for joystick input
    in      ddrc, r17           ; set analog joystick pins as input

    ldi     r18, 0x1f           ; select pins 8-12 for button LED output
    out     ddrb, r18           ; set digital button LED pins as output
    ldi     r18, 0x0c           ; select pins 2 & 3 for joystick LED ouput
    out     ddrc, r18           ; set analog joystick LED pins as output

loop:

    ldi     r20, PortD          ; read in from digital pins 0-7
    and     r20, r16            ; apply button input mask
    mov     r20, r20 >> 2       ; shift left twice
    sts     PortB, r20          ; turn on LEDs of pushed buttons

    ldi     r20, PortC          ; read in from analog pins
    and     r20, r17            ; apply joystick input mask
    mov     r20, r20 >> 2       ; shift left twice
    sts     PortC, r20          ; turn on LEDs of joystick movement
    rjmp    loop

.include "/usr/local/include/atmega32u4.def"

        .global  main

        .section .text


main:

        cbi     PortD, 2            ; joystick button
        cbi     PortD, 3            ; right button
        cbi     PortD, 4            ; up button
        cbi     PortD, 5            ; down button
        cbi     PortD, 6            ; left button

        cbi     PortC, 0            ; joystick vertical output
        cbi     PortC, 1            ; joystick horizontal output


        ldi     r16, 0x7c           ; select pins 2-6 for button input mask
        in      ddrd, r16           ; set digital button pins as input
        ldi     r17, 0x03           ; select pins 0 & 1 for joystick input
        in      ddrc, r17           ; set analog joystick pins as input

        ldi     r18, 0x1f           ; select pins 8-12 for button LED output
        out     ddrb, r18           ; set digital button LED pins as output
        ldi     r18, 0x0c           ; select pins 2 & 3 for joystick LED ouput
        out     ddrc, r18           ; set analog joystick LED pins as output

loop:

        ldi     r20, PortD          ; read in from digital pins 0-7
        and     r20, r16            ; apply button input mask
        mov     r20, r20 >> 2       ; shift left twice
        sts     PortB, r20          ; turn on LEDs of pushed buttons

        ldi     r20, PortC          ; read in from analog pins
        and     r20, r17            ; apply joystick input mask
        mov     r20, r20 >> 2       ; shift left twice
        sts     PortC, r20          ; turn on LEDs of joystick movement
        rjmp    loop

Source Link

asked Dec 7, 2014 at 23:30

Tim

Arduino uno AVR assembly with LEDs

I am currently in an introductory assembly language class. My assignment is to use a sparkfun joystick shield kit to do something with an arduino uno. I figure turning on LEDs is the easiest. We must program it in AVR assembly(note: we have only used nasm assembly all semester).

I don't really know how this needs to be done, but I would like the lights to turn on when a button is pressed (one LED per button). I also want to use the analog pins to have the joystick LEDs fade in and out.

below is the code I have right now, and don't have the equipment to test it.

Am I on the right track, or is it a horrible mess? The professor was referring to the arduino pins with hex, but I couldn't find a mapping of the pins and their hex values.

Thanks in advance.

.include "/usr/local/include/atmega32u4.def"

    .global  main

    .section .text

main:

    cbi     PortD, 2            ; joystick button
    cbi     PortD, 3            ; right button
    cbi     PortD, 4            ; up button
    cbi     PortD, 5            ; down button
    cbi     PortD, 6            ; left button

    cbi     PortC, 0            ; joystick vertical output
    cbi     PortC, 1            ; joystick horizontal output


    ldi     r16, 0x7c           ; select pins 2-6 for button input mask
    in      ddrd, r16           ; set digital button pins as input
    ldi     r17, 0x03           ; select pins 0 & 1 for joystick input
    in      ddrc, r17           ; set analog joystick pins as input

    ldi     r18, 0x1f           ; select pins 8-12 for button LED output
    out     ddrb, r18           ; set digital button LED pins as output
    ldi     r18, 0x0c           ; select pins 2 & 3 for joystick LED ouput
    out     ddrc, r18           ; set analog joystick LED pins as output

loop:

    ldi     r20, PortD          ; read in from digital pins 0-7
    and     r20, r16            ; apply button input mask
    mov     r20, r20 >> 2       ; shift left twice
    sts     PortB, r20          ; turn on LEDs of pushed buttons

    ldi     r20, PortC          ; read in from analog pins
    and     r20, r17            ; apply joystick input mask
    mov     r20, r20 >> 2       ; shift left twice
    sts     PortC, r20          ; turn on LEDs of joystick movement
    rjmp    loop