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import uos
from flashbdev import bdev
def check_bootsec():
buf = bytearray(bdev.SEC_SIZE)
bdev.readblocks(0, buf)
empty = True
for b in buf:
if b != 0xff:
empty = False
break
if empty:
return True
fs_corrupted()
def fs_corrupted():
import time
while 1:
print("""\
FAT filesystem appears to be corrupted. If you had important data there, you
may want to make a flash snapshot to try to recover it. Otherwise, perform
factory reprogramming of MicroPython firmware (completely erase flash, followed
by firmware programming).
""")
time.sleep(3)
def setup():
check_bootsec()
print("Performing initial setup")
uos.VfsFat.mkfs(bdev)
vfs = uos.VfsFat(bdev)
uos.mount(vfs, '/flash')
uos.chdir('/flash')
with open("boot.py", "w") as f:
f.write("""\
# This file is executed on every boot (including wake-boot from deepsleep)
""")
return vfs
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