gistfile1.txt

.thumb
.syntax unified

.include "gpio_constants.s"     // Register-adresser og konstanter for GPIO

.text
	.global Start
	.global GPIO_ODD_IRQHandler

Start:
    MOV R0, #5
    BAL Start

.thumb_func
GPIO_ODD_IRQHandler:
	// Do the actual toggling
	LDR R0, =GPIO_BASE
	LDR R1, =PORT_SIZE
	LDR R2, =PORT_E
	LDR R3, =GPIO_PORT_DOUTTGL
	MUL R1, R1, R2
	ADD R1, R1, R3
	ADD R0, R0, R1		// R1 is hex amount of bytes to offset GPIO_BASE with, PORT_SIZE*PORT + REG
	MOV R1, #0b00000100 // pins 0-7 from right to left
	STR R1, [R0]
	// Clear interrupt flag
	LDR R0, =GPIO_BASE
	LDR R1, =GPIO_IF
	ADD R0, R0, R1
	LDR R1, [R0]
	LDR R0, =GPIO_BASE
	LDR R2, =GPIO_IFC
	ADD R0, R0, R2
	STR R1, [R0]
	BX LR
	NOP