(ARM Cortex-A7) V3S (Lichee Pi Zero) >> Assembly
Button
參考資訊:
1. pdf
司徒將按鍵連接到PG4
GPIO位址
PG_CFG0
PG_DATA
PG_PUL0
main.s
.global _start .equ GPIO_BASE, 0x01c20800 .equ PG_CFG0, (GPIO_BASE + (0x24 * 6) + 0x00) .equ PG_DATA, (GPIO_BASE + (0x24 * 6) + 0x10) .equ PG_PUL0, (GPIO_BASE + (0x24 * 6) + 0x1c) .arm .text _start: .long 0xea000016 .byte 'e', 'G', 'O', 'N', '.', 'B', 'T', '0' .long 0, __spl_size .byte 'S', 'P', 'L', 2 .long 0, 0 .long 0, 0, 0, 0, 0, 0, 0, 0 .long 0, 0, 0, 0, 0, 0, 0, 0 _vector: b reset b . b . b . b . b . b . b . reset: ldr r0, =PG_CFG0 ldr r1, =0x00000001 str r1, [r0] ldr r0, =PG_PUL0 ldr r1, =0x00000100 str r1, [r0] ldr r0, =PG_DATA 0: ldr r1, [r0] lsr r1, #4 str r1, [r0] b 0b .end
完成