diff options
Diffstat (limited to 'contrib/cp210x-program/build/lib/cp210x/eeprom.py')
| -rw-r--r-- | contrib/cp210x-program/build/lib/cp210x/eeprom.py | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/contrib/cp210x-program/build/lib/cp210x/eeprom.py b/contrib/cp210x-program/build/lib/cp210x/eeprom.py new file mode 100644 index 0000000..25f0372 --- /dev/null +++ b/contrib/cp210x-program/build/lib/cp210x/eeprom.py @@ -0,0 +1,180 @@ +# -*- 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) + + |