def wipe():
"""
Blocks map in disco board
0: MBR
1 - 255: reserved
256 - 447: internal flash
448 - 33215: QSPI
"""
# delete files normally in simulator
try:
delete_recursively(fpath("/flash"))
delete_recursively(fpath("/qspi"))
except:
pass
# on real hardware overwrite flash with random data
if not simulator:
os.umount("/flash")
os.umount("/qspi")
f = pyb.Flash()
block_size = f.ioctl(5, None)
# wipe internal flash with random bytes
for i in range(256, 450):
b = os.urandom(block_size)
f.writeblocks(i, b)
del b
gc.collect()
# mpy will reformat fs on reboot
reboot()
def wipe_flash_filesystem():
# erase and re-format the flash filesystem (/flash/)
import ckcc, pyb
from main import dis, settings
dis.fullscreen('Erasing...')
os.umount('/flash')
# from extmod/vfs.h
BP_IOCTL_SEC_COUNT = (4)
BP_IOCTL_SEC_SIZE = (5)
# block-level erase
fl = pyb.Flash()
bsize = fl.ioctl(BP_IOCTL_SEC_SIZE, 0)
assert bsize == 512
bcount = fl.ioctl(BP_IOCTL_SEC_COUNT, 0)
blk = bytearray(bsize)
ckcc.rng_bytes(blk)
# trickiness: actual flash blocks are offset by 0x100 (FLASH_PART1_START_BLOCK)
# so fake MBR can be inserted. Count also inflated by 2X, but not from ioctl above.
for n in range(bcount):
fl.writeblocks(n + 0x100, blk)
ckcc.rng_bytes(blk)
dis.progress_bar_show(n * 2 / bcount)
# rebuild and mount /flash
dis.fullscreen('Rebuilding...')
ckcc.wipe_fs()
# re-store settings
settings.save()
# boot.py - handle safemode, start the watchdog and logging
# Copyright © 2020 by Thorsten von Eicken.
import gc, sys, machine, os, uctypes, stm, pyb
# set a GC threshold early on to reduce heap fragmentation woes
gc.threshold(4096)
# chdir to / to make pybd look like esp32 (ouch!)
os.umount("/flash")
os.mount(pyb.Flash(start=0), "/")
os.chdir("/")
sys.path[:] = ["", "/lib"]
# BkpRAM class copied from https://github.com/peterhinch/micropython-micropower/blob/master/upower.py
# Copyright 2016 Peter Hinch
# This code is released under the MIT licence
class BkpRAM(object):
BKPSRAM = 0x40024000
def __init__(self):
stm.mem32[stm.RCC + stm.RCC_APB1ENR] |= 0x10000000 # PWREN bit
stm.mem32[
stm.PWR + stm.
PWR_CR] |= 0x100 # Set the DBP bit in the PWR power control register
stm.mem32[stm.RCC + stm.RCC_AHB1ENR] |= 0x40000 # enable BKPSRAMEN
stm.mem32[stm.PWR +
stm.PWR_CSR] |= 0x200 # BRE backup register enable bit
self._ba = uctypes.bytearray_at(self.BKPSRAM, 4096)
pyb.ExtInt(pyb.Pin('B1'), pyb.ExtInt.IRQ_FALLING, pyb.Pin.PULL_NONE, pwrcb)
# configure usb from start if you want,
# otherwise will be configured after PIN
# pyb.usb_mode("VCP+MSC") # debug mode without USB from start
# disable at start
# pyb.usb_mode(None)
# os.dupterm(None,0)
# os.dupterm(None,1)
# last 512 kB are used for secrets
FLASH_SIZE = 512 * 1024
# check and mount internal flash
if os.statvfs('/flash') == os.statvfs('/qspi'):
os.umount('/flash')
f = pyb.Flash()
numblocks = f.ioctl(4, None)
blocksize = f.ioctl(5, None) # 512
size = numblocks * blocksize
# we use last 512 kB
start = numblocks * blocksize - FLASH_SIZE
if start < 0:
start = 0
# try to mount
try:
os.mount(pyb.Flash(start=start), '/flash')
# if fail - format and mount
except:
os.VfsFat.mkfs(pyb.Flash(start=start))
os.mount(pyb.Flash(start=start), '/flash')
# boot.py -- run on boot-up
# can run arbitrary Python, but best to keep it minimal
import machine
import pyb
import os
import utime
pyb.country('GB') # ISO 3166-1 Alpha-2 code, eg US, GB, DE, AU
# https://pybd.io/hw/pybd_sfxw.html
# The board has a built-in micro SD card slot. If an SD card is inserted, by default it will not be automatically
# mount in the board’s filesystem but it will be exposed as a mass storage device if USB is used. To automatically
# mount the SD card if it is inserted, put the following in your boot.py:
# Enable power supply to sdcard
pyb.Pin.board.EN_3V3.on()
utime.sleep_ms(10)
if pyb.SDCard().present():
# Extra delay to let the SDCard start up before mounting.
utime.sleep_ms(500)
os.mount(pyb.SDCard(), '/sd')
pyb.usb_mode('VCP+MSC',
msc=(pyb.Flash(),
pyb.SDCard())) # act as a serial and a storage device
else:
pyb.usb_mode('VCP+MSC') # act as a serial and a storage device
pyb.main('main.py') # main script to run after this one
# MIT license; Copyright (c) 2022 Damien P. George
from micropython import const
import struct, machine, fwupdate, spiflash, pyb
_IOCTL_BLOCK_COUNT = const(4)
_IOCTL_BLOCK_SIZE = const(5)
_SPIFLASH_UPDATE_KEY_ADDR = const(1020 * 1024)
_SPIFLASH_UPDATE_KEY_VALUE = const(0x12345678)
_FILESYSTEM_ADDR = const(0x8000_0000 + 1024 * 1024)
# Roundabout way to get actual filesystem size from config.
# This takes into account the 1M "reserved" section of the flash memory.
flash = pyb.Flash(start=0)
_FILESYSTEM_LEN = flash.ioctl(_IOCTL_BLOCK_COUNT, None) * flash.ioctl(
_IOCTL_BLOCK_SIZE, None)
def update_app(filename):
print(f"Updating application firmware from {filename}")
# Create the elements for the mboot filesystem-load operation.
elems = fwupdate.update_app_elements(filename, _FILESYSTEM_ADDR,
_FILESYSTEM_LEN)
if not elems:
return
# Create the update key.
key = struct.pack("<I", _SPIFLASH_UPDATE_KEY_VALUE)
pyb.country('GB') # ISO 3166-1 Alpha-2 code, eg US, GB, DE, AU
# https://pybd.io/hw/pybd_sfxw.html
# The CPU frequency can be set to any multiple of 2MHz between 48MHz and 216MHz, via machine.freq(<freq>).
# By default the SF2 model runs at 120MHz and the SF6 model at 144MHz in order to conserve electricity.
# It is possible to go below 48MHz but then the WiFi cannot be used.
# From: https://github.com/micropython/micropython/issues/4662
# This sometimes causes problems with USB and possibly SDCard if done later.
# Best done in boot before usb and sdcard are initialised.
# machine.freq(48000000) # Set to lowest usable frequency
# https://pybd.io/hw/pybd_sfxw.html
# The board has a built-in micro SD card slot. If an SD card is inserted, by default it will not be automatically
# mount in the board's filesystem but it will be exposed as a mass storage device if USB is used. To automatically
# mount the SD card if it is inserted, put the following in your boot.py:
# Enable power supply to sdcard
pyb.Pin.board.EN_3V3.on()
utime.sleep_ms(10)
if pyb.SDCard().present():
# Extra delay to let the SDCard start up before mounting.
utime.sleep_ms(500)
os.mount(pyb.SDCard(), '/sd')
pyb.usb_mode('VCP+MSC', msc=(pyb.Flash(), pyb.SDCard())) # act as a serial and a storage device
else:
pyb.usb_mode('VCP+MSC') # act as a serial and a storage device
pyb.main('main.py') # main script to run after this one run after this one
