掌機 - Game & Watch: The Legend of Zelda - Assembly - Button

參考資訊：
https://github.com/ghidraninja/game-and-watch-backup
https://www.st.com/resource/en/datasheet/stm32h7b0vb.pdf
https://www.st.com/resource/en/reference_manual/dm00463927-stm32h7a37b3-and-stm32h7b0-value-line-advanced-armbased-32bit-mcus-stmicroelectronics.pdf

按鍵腳位


Clock


Mode


Pull-up


Input


main.s

    .equiv PORTD_BASE,  0x58020c00
    .equiv PORTE_BASE,  0x58021000
    .equiv GPIO_MODER,  0x0000
    .equiv GPIO_PUPDR,  0x000c
    .equiv GPIO_IDR,    0x0010
    .equiv GPIO_ODR,    0x0014

    .equiv RCC_BASE,    0x58024400
    .equiv RCC_AHB4ENR, 0x0140

    .thumb
    .cpu cortex-m7
    .syntax unified

    .global _start

    .text
    .org 0x0000
_start:
    .word 0x20020000
    .word reset

    .org 0x0100
    .thumb_func
reset:
    ldr r0, =RCC_BASE
    ldr r1, [r0, #RCC_AHB4ENR]
    orr r1, #(1 << 4) | (1 << 3)
    str r1, [r0, #RCC_AHB4ENR]

    ldr r0, =PORTD_BASE
    ldr r1, =0
    str r1, [r0, #GPIO_MODER]
    ldr r1, =(1 << 18)
    str r1, [r0, #GPIO_PUPDR]

    ldr r0, =PORTE_BASE
    ldr r1, =(1 << 22)
    str r1, [r0, #GPIO_MODER]
    ldr r1, =(0 << 11)
    str r1, [r0, #GPIO_ODR]

0:
    ldr r0, =PORTD_BASE
    ldr r1, [r0, #GPIO_IDR]
    lsl r1, #2
    ldr r0, =PORTE_BASE
    str r1, [r0, #GPIO_ODR]
    b 0b
    .end

完成