Software saveboot using P14 on Pytrack/Pysense

[tvetter1976]

Quite often (depending on my code ) I had problems uploading code, accessing the REPL or connecting to the board. I found myself a solution using the Button on Pytrack/Pysense when starting up the divice after a reset. Instead of the main.py an altenative main.py ( main_save.py in my case) will be loaded. Here is my boot.py code. Mybe someone find it useful:

from machine import Timer
from machine import Pin
from machine import main
import pycom

pycom.heartbeat(False)

chrono = Timer.Chrono()
chrono.start()

i=True
saveboot=False

##Timeout for pressing the button
waitForSavebootTimeout=3

###Waiting for the buttonn to be pressed:  Green LED 
pycom.rgbled(0x005500)  

while i==True:
    if (Pin('P14').value()==0):
        saveboot=True
    lap = chrono.read()
    if lap>waitForSavebootTimeout  or    saveboot:
        i=False

if   saveboot:
    ###entering save boot main_save.py will be loaded: Blue LED 
    pycom.rgbled(0x000055)  
    main("main_save.py")

if   not saveboot:
    ###entering normal boot main.py will be loaded: Red LED 
    pycom.rgbled(0x550000)