F1C200S >> Assembly
Button
參考資料:
1. pdf
2. lichee
3. mangopi_r
4. allwinner
BOOT按鍵是接到PC2
暫存器
提昇電阻
main.s
.global _start .equiv GPIO_BASE, 0x01c20800 .equiv PA, (0x24 * 0) .equiv PC, (0x24 * 2) .equiv PORT_CFG0, 0x00 .equiv PORT_DATA, 0x10 .equiv PORT_PUL0, 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, =GPIO_BASE ldr r1, =0x1000 str r1, [r0, #(PA + PORT_CFG0)] ldr r1, =0x08 str r1, [r0, #(PA + PORT_DATA)] ldr r1, =0x0000 str r1, [r0, #(PC + PORT_CFG0)] ldr r1, =0x10 str r1, [r0, #(PC + PORT_PUL0)] 0: ldr r1, [r0, #(PC + PORT_DATA)] lsl r1, #1 str r1, [r0, #(PA + PORT_DATA)] b 0b .end
完成