async def microsd_upgrade(*a):
# Upgrade vis MicroSD card
# - search for a particular file
# - verify it lightly
# - erase serial flash
# - copy it over (slow)
# - reboot into bootloader, which finishes install
fn = await file_picker('Pick firmware image to use (.DFU)',
suffix='.dfu',
min_size=0x7800)
if not fn: return
failed = None
with CardSlot() as card:
with open(fn, 'rb') as fp:
from main import sf, dis
from files import dfu_parse
from ustruct import unpack_from
offset, size = dfu_parse(fp)
# get a copy of special signed heaer at the end of the flash as well
from sigheader import FW_HEADER_OFFSET, FW_HEADER_SIZE, FW_HEADER_MAGIC, FWH_PY_FORMAT
hdr = bytearray(FW_HEADER_SIZE)
fp.seek(offset + FW_HEADER_OFFSET)
# basic checks only: for confused customers, not attackers.
try:
rv = fp.readinto(hdr)
assert rv == FW_HEADER_SIZE
magic_value, timestamp, version_string, pk, fw_size = \
unpack_from(FWH_PY_FORMAT, hdr)[0:5]
assert magic_value == FW_HEADER_MAGIC
assert fw_size == size
# TODO: maybe show the version string? Warn them that downgrade doesn't work?
except Exception as exc:
failed = "Sorry! That does not look like a firmware " \
"file we would want to use.\n\n\n%s" % exc
if not failed:
# copy binary into serial flash
fp.seek(offset)
buf = bytearray(256) # must be flash page size
pos = 0
dis.fullscreen("Loading...")
while pos <= size + FW_HEADER_SIZE:
dis.progress_bar_show(pos / size)
if pos == size:
# save an extra copy of the header (also means we got done)
buf = hdr
else:
here = fp.readinto(buf)
if not here: break
if pos % 4096 == 0:
# erase here
sf.sector_erase(pos)
while sf.is_busy():
await sleep_ms(10)
sf.write(pos, buf)
# full page write: 0.6 to 3ms
while sf.is_busy():
await sleep_ms(1)
pos += here
if failed:
await ux_show_story(failed, title='Corrupt')
return
# continue process...
import machine
machine.reset()
async def microsd_upgrade(*a):
# Upgrade vis MicroSD card
# - search for a particular file
# - verify it lightly
# - erase serial flash
# - copy it over (slow)
# - reboot into bootloader, which finishes install
fn = await file_picker('Pick firmware image to use (.DFU)', suffix='.dfu', min_size=0x7800)
if not fn: return
failed = None
with CardSlot() as card:
with open(fn, 'rb') as fp:
from main import sf, dis
from files import dfu_parse
from utils import check_firmware_hdr
offset, size = dfu_parse(fp)
# we also put a copy of special signed heaer at the end of the flash
from sigheader import FW_HEADER_OFFSET, FW_HEADER_SIZE
# read just the signature header
hdr = bytearray(FW_HEADER_SIZE)
fp.seek(offset + FW_HEADER_OFFSET)
rv = fp.readinto(hdr)
assert rv == FW_HEADER_SIZE
# check header values
failed = check_firmware_hdr(hdr, size)
if not failed:
patched = 0
# copy binary into serial flash
fp.seek(offset)
buf = bytearray(256) # must be flash page size
pos = 0
dis.fullscreen("Loading...")
while pos <= size + FW_HEADER_SIZE:
dis.progress_bar_show(pos/size)
if pos == size:
# save an extra copy of the header (also means we got done)
buf = hdr
patched += 1
else:
here = fp.readinto(buf)
if not here: break
if pos == (FW_HEADER_OFFSET & ~255):
# update w/ our patched version of hdr
buf[128:FW_HEADER_SIZE+128] = hdr
patched += 1
if pos % 4096 == 0:
# erase here
sf.sector_erase(pos)
while sf.is_busy():
await sleep_ms(10)
sf.write(pos, buf)
# full page write: 0.6 to 3ms
while sf.is_busy():
await sleep_ms(1)
pos += here
assert patched == 2
if failed:
await ux_show_story(failed, title='Sorry!')
return
# continue process...
import machine
machine.reset()