.thumb
.syntax unified

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

.text
    .global Start

Start:
    LDR R0, =GPIO_BASE + (PORT_SIZE * BUTTON_PORT) + GPIO_PORT_DIN

    LDR R1, =GPIO_BASE + (PORT_E * PORT_SIZE) + GPIO_PORT_DOUTSET
    LDR R2, =GPIO_BASE + (PORT_E * PORT_SIZE) + GPIO_PORT_DOUTCLR

    LDR R3, =1 << LED_PIN
    LDR R4, =1 << BUTTON_PIN

Loop:
    LDR R5, [R0]
    CMP R5, R4
    BNE On

Off:
    STR R3, [R2]
    B Loop

On:
    STR R3, [R1]
    B Loop

NOP // Behold denne på bunnen av fila