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# -*- coding: utf-8 -*-
# Copyright (c) 2007 Johannes Hölzl <johannes.hoelzl@gmx.de>
#
# This library is covered by the GNU LGPL, read LICENSE for details.
import cp210x
from cp210x import from_binary, to_binary, iif, VALUES
__all__ = ['EEPROM', 'HexFileError']
POS_BAUDRATE_TABLE = 0x0000
POS_PART_NUMBER = 0x01FF
POS_PRODUCT_STRING = 0x0208
POS_SERIAL_NUMBER = 0x0307
POS_PRODUCT_ID = 0x0390
POS_VENDOR_ID = 0x0392
POS_VERSION = 0x0394
POS_CFG_ATTRIBUTES = 0x03A1
POS_MAX_POWER = 0x03A2
POS_VENDOR_STRING = 0x03C3
POS_LOCK_VALUE = 0x03FF
class HexFileError(StandardError):
pass
def checksum(line):
return sum(ord(c) for c in line) & 0xFF
def _int_value(position, size, read=lambda x:x, write=lambda x:x):
def get(self):
return read(from_binary(self.get(position, size)))
def set(self, value):
self.set(position, to_binary(write(value), size))
return property(get, set)
def _str_value(position, max_size):
def get(self):
size = from_binary(self.get(position, 1))
assert size <= (max_size + 2) and size >= 2
assert self.get(position + 1, 1) == '\x03', "Missing 0x03 at %04X" % (position + 1)
return self.get(position + 2, size - 2).decode('utf-16-le')
def set(self, value):
encoded = value.encode('utf-16-le')
assert len(encoded) <= max_size
self.set(position, chr(len(encoded) + 2) + '\x03' + encoded)
return property(get, set)
class EEPROM(object):
START_ADDRESS = 0x3600
def __init__(self, content=None):
if isinstance(content, str) or content is None:
assert content is None or len(content) == cp210x.SIZE_EEPROM
self.content = content
elif isinstance(content, cp210x.Cp210xProgrammer):
self.content = content.get_eeprom_content()
else:
self.parse_hex_file(content.read())
def write_to_cp210x(self, cp210xDevice):
cp210xDevice.set_eeprom_content(self.content)
def parse_hex_file(self, hex_content):
self.content = ''
address = self.START_ADDRESS
for tag in hex_content.split('\n'):
if not tag.startswith(':'):
raise HexFileError("Line doesn't start with ':'")
try:
content = tag[1:].decode('hex')
except TypeError:
raise HexFileError("Hex data expected")
if len(content) < 5:
raise HexFileError("Line to short")
if checksum(content) != 0:
raise HexFileError("Checksum error")
size = from_binary(content[0])
tag_address = from_binary(content[1:3], le=False)
tag_type = from_binary(content[3:4])
line = content[4:-1]
if tag_type == 0x00:
if tag_address != address:
raise HexFileError("Expected address %04X but found %04X"
% (address, tag_address))
self.content += line
address += len(line)
elif tag_type == 0x01:
if size != 0 or len(line) != 0:
raise HexFileError("Defekt end tag")
break
else:
raise HexFileError("Unknown tag type %02X" % tag_type)
def build_hex_file(self):
for tag_start in range(0, len(self.content), 0x10):
line = self.content[tag_start:tag_start+0x10]
address = self.START_ADDRESS + tag_start
tag = (to_binary(len(line), 1) +
to_binary(address, le=False) +
'\x00' +
line)
cs = checksum(tag)
if cs == 0:
tag += '\x00'
else:
tag += chr(0x100 - cs)
yield ":%s\n" % tag.encode('hex')
yield ":00000001FF\n"
def write_hex_file(self, f):
if isinstance(f, str):
f = file(f, 'wb')
do_close = True
else:
do_close = False
for line in self.build_hex_file():
f.write(line)
if do_close:
f.close()
def read_hex_file(self, f):
if isinstance(f, str):
f = file(f, 'rb')
do_close = True
else:
do_close = False
self.parse_hex_file(f.read())
if do_close:
f.close()
def get(self, pos, length):
return self.content[pos:pos+length]
def set(self, pos, data):
self.content = (self.content[:pos] +
data +
self.content[pos + len(data):])
def _get_baudrate_table(self):
dat = self.get(POS_BAUDRATE_TABLE, cp210x.SIZE_BAUDRATE_TABLE)
return [cp210x.parse_baudrate_cfg(dat[pos:pos+cp210x.SIZE_BAUDRATE_CFG])
for pos in range(0, cp210x.SIZE_BAUDRATE_TABLE,
cp210x.SIZE_BAUDRATE_CFG)]
def _set_baudrate_table(self, baudrates):
assert len(baudrates) == cp210x.SIZE_BAUDRATES
self.set(POS_BAUDRATE_TABLE,
''.join(cp210x.build_baudrate_cfg(*cfg) for cfg in baudrates))
baudrate_table = property(_get_baudrate_table, _set_baudrate_table)
product_string = _str_value(POS_PRODUCT_STRING, cp210x.SIZE_PRODUCT_STRING)
serial_number = _str_value(POS_SERIAL_NUMBER, cp210x.SIZE_SERIAL_NUMBER)
part_number = _int_value(POS_PART_NUMBER, 1)
product_id = _int_value(POS_PRODUCT_ID, 2)
vendor_id = _int_value(POS_VENDOR_ID, 2)
version = _int_value(POS_VERSION, 2,
cp210x.from_bcd2, cp210x.to_bcd2)
bus_powered = _int_value(POS_CFG_ATTRIBUTES, 1,
lambda a: bool(a & 0x40),
lambda a: iif(a, 0xC0, 0x80))
max_power = _int_value(POS_MAX_POWER, 1, lambda p: p*2, cp210x.to_div2)
vendor_string = _str_value(POS_VENDOR_STRING, cp210x.SIZE_VENDOR_STRING)
locked = _int_value(POS_LOCK_VALUE, 1,
lambda l: l == cp210x.LCK_LOCKED,
lambda b: iif(b, cp210x.LCK_LOCKED,
cp210x.LCK_UNLOCKED))
def get_values(self):
return dict((name, getattr(self, name)) for name, type in VALUES)
def set_values(self, values):
for name, value in values.items():
setattr(self, name, value)
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