#include <avr32/io.h>

.section	.text
.align	1
main:
    // stack starts at 0x24001FFF downto 0x24000000 which is the first 2K of SRAM
    // after pagin is enabled we will access SRAM from the P3 segment by remapping the address
	lddpc 	sp,.stackBase


    // keep top of stack in r7, and use 8 byte in the stack. It is a buffer for our local vars
    mov     r7, sp
	sub     sp, 8

    // initialize PIOA    
    mov     r6,0x80000
    lddpc   r8,.pioa
    st.w    r8[AVR32_PIO_PER],r6
    st.w    r8[AVR32_PIO_OER],r6
    st.w    r8[AVR32_PIO_IDR],r6
    st.w    r8[AVR32_PIO_PUDR],r6

    mov     r9,0
test:
    sub     r9, -1
    lddpc   r4,.andvar
    and     r4, r9, r4
    breq    br2

    st.w    r8[AVR32_PIO_CODR],r6
    rjmp    test
br2:
    st.w    r8[AVR32_PIO_SODR],r6

    rjmp    test    

// contants. They can stay in the text section, we won't modify them
.stackBase:     .int    0x24001FFF
.pioa:         .int    0xFFE02800
.andvar:    .int 0x0800000

// data section: this will be loaded into ram. It will then need to be referenced
// with a pointer and a displacement be
.section .data
.var2: .int 0xFFFFFFFF