SAMD21G18 >> Assembly
Button
參考資訊：
1. pdf
2. sample
按鍵腳位(PA-6)
暫存器
配置方式
main.s
.cpu cortex-m0 .thumb .equiv PORT_BASE, 0x41004400 .equiv PORT_A, 0x00 .equiv PORT_DIR, 0x00 .equiv PORT_OUT, 0x10 .equiv PORT_IN, 0x20 .equiv PORT_PINCFG6, 0x46 .thumb_func .global _start _start: .word 0x20001000 .word reset .word hang .word hang .word hang .word hang .word hang .word hang .word hang .word hang .word hang .word hang .word hang .word hang .word hang .word hang .thumb_func reset: ldr r0, =PORT_BASE ldr r1, =(1 << 17) str r1, [r0, #(PORT_A + PORT_DIR)] ldr r1, =0xffffffff str r1, [r0, #(PORT_A + PORT_OUT)] ldr r1, =(1 << 2) | (1 << 1) ldr r2, =PORT_BASE + PORT_A + PORT_PINCFG6 strb r1, [r2] 0: ldr r1, [r0, #(PORT_A + PORT_IN)] lsl r1, #11 ldr r2, =(1 << 6) orr r1, r2 str r1, [r0, #(PORT_A + PORT_OUT)] b 0b .thumb_func hang: b . .end
完成
