from rp2 import *
from machine import *
import uarray

l = Pin(0, Pin.OUT)

regdata = uarray.array('i',[
    0xd0000000 + 0x010, # 0  SIO OUT
    0xd0000000 + 0x018, # 4  SIO OUT_CLR
    0xd0000000 + 0x014, # 8  SIO OUT_SET
    1 << 0              # 12 GP0 
])

@micropython.asm_thumb
def led_off(r0):
    mov(r1,r0)      # store argument (16B array) to r1
    ldr(r2,[r1,4])  # load OUT_CLR address
    ldr(r0,[r1,12]) # mask data to store on OUT_CLR address
    str(r0,[r2,0])  # store 0x00000001 on [OUT_CLR]

@micropython.asm_thumb
def led_on(r0):
    mov(r1,r0)      # store argument (16B array) to r1 
    ldr(r2,[r1,8])  # load OUT_SET address from array
    ldr(r0,[r1,12]) # mask data to store on OUT_SET address
    str(r0,[r2,0])  # store 0x00000001 on [OUT_SET]

@micropython.asm_thumb
def asm_delay(r0):
    mov(r4, r0)         # move argument (number of iterations) to r4
    label(delay_off)    # define delay as a part of the loop
    sub(r4, r4, 1)      # substract 1 from content of r4 (decrement)
    cmp(r4, 0)          # compare r4 with 0
    bgt(delay_off)      # if r4 is bigger than 0, jump back to label

while True:
    led_on(regdata)
    asm_delay(5599900)
    led_off(regdata)
    asm_delay(5599900)