NUC977 >> Assembly
Button
參考資訊:
1. pdf
2. NUC970_NonOS_BSP
Pull-Up Enable
main.s
.equ GPIOD_DIR, (0xb8003000 + 0xc0) .equ GPIOD_DATAOUT, (0xb8003000 + 0xc4) .equ GPIOB_DIR, (0xb8003000 + 0x40) .equ GPIOB_DATAIN, (0xb8003000 + 0x48) .equ GPIOB_PUEN, (0xb8003000 + 0x60) .equ CLK_PCLKEN0, (0xb0000200 + 0x18) .text .align 2 .global _start _start: b reset _undef: b . _swi: b . _pabort: b . _dabort: b . _reserved: b . _irq: b . _fiq: b . reset: ldr r0, =CLK_PCLKEN0 ldr r1, [r0] orr r1, #(1 << 3) str r1, [r0] ldr r0, =GPIOB_DIR ldr r1, =~(1 << 3) str r1, [r0] ldr r0, =GPIOB_PUEN ldr r1, =(1 << 3) str r1, [r0] ldr r0, =GPIOD_DIR ldr r1, =(1 << 6) str r1, [r0] loop: ldr r0, =GPIOB_DATAIN ldr r0, [r0] and r0, #(1 << 3) cmp r0, #(1 << 3) bne 1f 0: ldr r0, =GPIOD_DATAOUT ldr r1, =(1 << 6) str r1, [r0] b loop 1: ldr r0, =GPIOD_DATAOUT ldr r1, =~(1 << 6) str r1, [r0] b loop .end
完成