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# -*- coding: utf-8 -*-
#
# Copyright 2019 SoloKeys Developers
#
# Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
# http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
# http://opensource.org/licenses/MIT>, at your option. This file may not be
# copied, modified, or distributed except according to those terms.
import errno
import struct
import time
import usb._objfinalizer
import usb.core
import usb.util
from . import exceptions
from .commands import DFU, STM32L4
def find(dfu_serial=None, attempts=8, raw_device=None, altsetting=1):
"""dfu_serial is the ST bootloader serial number.
It is not directly the ST chip identifier, but related via
https://github.com/libopencm3/libopencm3/blob/master/lib/stm32/desig.c#L68
"""
for i in range(attempts):
dfu = DFUDevice()
try:
dfu.find(ser=dfu_serial, dev=raw_device, altsetting=altsetting)
return dfu
except RuntimeError:
time.sleep(0.25)
# return None
raise Exception("no DFU found")
def find_all():
st_dfus = usb.core.find(idVendor=0x0483, idProduct=0xDF11, find_all=True)
return [find(raw_device=st_dfu) for st_dfu in st_dfus]
def hot_patch_windows_libusb():
# hot patch for windows libusb backend
olddel = usb._objfinalizer._AutoFinalizedObjectBase.__del__
def newdel(self):
try:
olddel(self)
except OSError:
pass
usb._objfinalizer._AutoFinalizedObjectBase.__del__ = newdel
class DFUDevice:
def __init__(
self,
):
pass
@staticmethod
def addr2list(a):
return [a & 0xFF, (a >> 8) & 0xFF, (a >> 16) & 0xFF, (a >> 24) & 0xFF]
@staticmethod
def addr2block(addr, size):
addr -= 0x08000000
addr //= size
addr += 2
return addr
@staticmethod
def block2addr(addr, size):
addr -= 2
addr *= size
addr += 0x08000000
return addr
def find(self, altsetting=0, ser=None, dev=None):
if dev is not None:
self.dev = dev
else:
if ser:
devs = usb.core.find(idVendor=0x0483, idProduct=0xDF11, find_all=True)
eligible = [
d for d in devs if ser == usb.util.get_string(d, d.iSerialNumber)
]
if len(eligible) > 1:
raise exceptions.NonUniqueDeviceError
if len(eligible) == 0:
raise RuntimeError("No ST DFU devices found.")
self.dev = eligible[0]
print("connecting to ", ser)
else:
eligible = list(
usb.core.find(idVendor=0x0483, idProduct=0xDF11, find_all=True)
)
if len(eligible) > 1:
raise exceptions.NonUniqueDeviceError
if len(eligible) == 0:
raise RuntimeError("No ST DFU devices found.")
self.dev = eligible[0]
if self.dev is None:
raise RuntimeError("No ST DFU devices found.")
self.dev.set_configuration()
for cfg in self.dev:
for intf in cfg:
if intf.bAlternateSetting == altsetting:
intf.set_altsetting()
self.intf = intf
self.intNum = intf.bInterfaceNumber
return self.dev
raise RuntimeError("No ST DFU alternate-%d found." % altsetting)
# Main memory == 0
# option bytes == 1
def set_alt(self, alt):
for cfg in self.dev:
for intf in cfg:
# print(intf, intf.bAlternateSetting)
if intf.bAlternateSetting == alt:
intf.set_altsetting()
self.intf = intf
self.intNum = intf.bInterfaceNumber
# return self.dev
def init(self):
if self.state() == DFU.state.ERROR:
self.clear_status()
def close(self):
pass
def get_status(self):
tries = 3
while True:
try:
# bmReqType, bmReq, wValue, wIndex, data/size
s = self.dev.ctrl_transfer(
DFU.type.RECEIVE, DFU.bmReq.GETSTATUS, 0, self.intNum, 6
)
break
except usb.core.USBError as e:
if e.errno == errno.EPIPE:
if tries > 0:
tries -= 1
time.sleep(0.01)
else:
# do not pass on EPIPE which might be swallowed by 'click'
raise RuntimeError("Failed to get status from DFU.")
else:
raise
return DFU.status(s)
def state(self):
return self.get_status().state
def clear_status(self):
# bmReqType, bmReq, wValue, wIndex, data/size
self.dev.ctrl_transfer(DFU.type.SEND, DFU.bmReq.CLRSTATUS, 0, self.intNum, None)
def upload(self, block, size):
"""
address is ((block – 2) × size) + 0x08000000
"""
# bmReqType, bmReq, wValue, wIndex, data/size
return self.dev.ctrl_transfer(
DFU.type.RECEIVE, DFU.bmReq.UPLOAD, block, self.intNum, size
)
def set_addr(self, addr):
# must get_status after to take effect
return self.dnload(0x0, [0x21] + DFUDevice.addr2list(addr))
def dnload(self, block, data):
# bmReqType, bmReq, wValue, wIndex, data/size
return self.dev.ctrl_transfer(
DFU.type.SEND, DFU.bmReq.DNLOAD, block, self.intNum, data
)
def erase(self, a):
d = [0x41, a & 0xFF, (a >> 8) & 0xFF, (a >> 16) & 0xFF, (a >> 24) & 0xFF]
return self.dnload(0x0, d)
def mass_erase(self):
# self.set_addr(0x08000000)
# self.block_on_state(DFU.state.DOWNLOAD_BUSY)
# assert(DFU.state.DOWNLOAD_IDLE == self.state())
self.dnload(0x0, [0x41])
self.block_on_state(DFU.state.DOWNLOAD_BUSY)
assert DFU.state.DOWNLOAD_IDLE == self.state()
def write_page(self, addr, data):
if self.state() not in (DFU.state.IDLE, DFU.state.DOWNLOAD_IDLE):
self.clear_status()
self.clear_status()
if self.state() not in (DFU.state.IDLE, DFU.state.DOWNLOAD_IDLE):
raise RuntimeError("DFU device not in correct state for writing memory.")
addr = DFUDevice.addr2block(addr, len(data))
# print('flashing %d bytes to block %d/%08x...' % (len(data), addr,oldaddr))
self.dnload(addr, data)
self.block_on_state(DFU.state.DOWNLOAD_BUSY)
assert DFU.state.DOWNLOAD_IDLE == self.state()
def read_mem(self, addr, size):
addr = DFUDevice.addr2block(addr, size)
if self.state() not in (DFU.state.IDLE, DFU.state.UPLOAD_IDLE):
self.clear_status()
self.clear_status()
if self.state() not in (DFU.state.IDLE, DFU.state.UPLOAD_IDLE):
raise RuntimeError("DFU device not in correct state for reading memory.")
return self.upload(addr, size)
def block_on_state(self, state):
s = self.get_status()
while s.state == state:
time.sleep(s.timeout / 1000.0)
s = self.get_status()
def read_option_bytes(self):
ptr = 0x1FFF7800 # option byte address for STM32l432
self.set_addr(ptr)
self.block_on_state(DFU.state.DOWNLOAD_BUSY)
m = self.read_mem(0, 16)
return m
def write_option_bytes(self, m):
self.block_on_state(DFU.state.DOWNLOAD_BUSY)
try:
m = self.write_page(0, m)
self.block_on_state(DFU.state.DOWNLOAD_BUSY)
except OSError:
print("Warning: OSError with write_page")
def prepare_options_bytes_detach(self):
# Necessary to prevent future errors...
m = self.read_mem(0, 16)
self.write_option_bytes(m)
#
m = self.read_option_bytes()
op = struct.unpack("<L", m[:4])[0]
oldop = op
op |= STM32L4.options.nBOOT0
op &= ~STM32L4.options.nSWBOOT0
if oldop != op:
print("Rewriting option bytes...")
m = struct.pack("<L", op) + m[4:]
self.write_option_bytes(m)
def detach(self):
if self.state() not in (DFU.state.IDLE, DFU.state.DOWNLOAD_IDLE):
self.clear_status()
self.clear_status()
if self.state() not in (DFU.state.IDLE, DFU.state.DOWNLOAD_IDLE):
raise RuntimeError("DFU device not in correct state for detaching.")
# self.set_addr(0x08000000)
# self.block_on_state(DFU.state.DOWNLOAD_BUSY)
# assert(DFU.state.DOWNLOAD_IDLE == self.state())
self.dnload(0x0, [])
return self.get_status()
# return self.dev.ctrl_transfer(DFU.type.SEND, DFU.bmReq.DETACH, 0, self.intNum, None)
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