1 files changed, 317 insertions, 0 deletions

diff --git a/util/stm32eeprom_parser.py b/util/stm32eeprom_parser.py
new file mode 100755
index 000000000..b124f713d
--- /dev/null
+++ b/util/stm32eeprom_parser.py
@@ -0,0 +1,317 @@
+#!/usr/bin/env python
+#
+# Copyright 2021 Don Kjer
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+from __future__ import print_function
+
+import argparse
+from struct import pack, unpack
+import os, sys
+
+MAGIC_FEEA     = '\xea\xff\xfe\xff'
+
+MAGIC_FEE9     = '\x16\x01'
+EMPTY_WORD     = '\xff\xff'
+WORD_ENCODING  = 0x8000
+VALUE_NEXT     = 0x6000
+VALUE_RESERVED = 0x4000
+VALUE_ENCODED  = 0x2000
+BYTE_RANGE     = 0x80
+
+CHUNK_SIZE = 1024
+
+STRUCT_FMTS = {
+    1: 'B',
+    2: 'H',
+    4: 'I'
+}
+PRINTABLE='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~ '
+
+EECONFIG_V1 = [
+    ("MAGIC",                0, 2),
+    ("DEBUG",                2, 1),
+    ("DEFAULT_LAYER",        3, 1),
+    ("KEYMAP",               4, 1),
+    ("MOUSEKEY_ACCEL",       5, 1),
+    ("BACKLIGHT",            6, 1),
+    ("AUDIO",                7, 1),
+    ("RGBLIGHT",             8, 4),
+    ("UNICODEMODE",         12, 1),
+    ("STENOMODE",           13, 1),
+    ("HANDEDNESS",          14, 1),
+    ("KEYBOARD",            15, 4),
+    ("USER",                19, 4),
+    ("VELOCIKEY",           23, 1),
+    ("HAPTIC",              24, 4),
+    ("MATRIX",              28, 4),
+    ("MATRIX_EXTENDED",     32, 2),
+    ("KEYMAP_UPPER_BYTE",   34, 1),
+]
+VIABASE_V1 = 35
+
+VERBOSE = False
+
+def parseArgs():
+    parser = argparse.ArgumentParser(description='Decode an STM32 emulated eeprom dump')
+    parser.add_argument('-s', '--size', type=int,
+                        help='Size of the emulated eeprom (default: input_size / 2)')
+    parser.add_argument('-o', '--output', help='File to write decoded eeprom to')
+    parser.add_argument('-y', '--layout-options-size', type=int,
+                        help='VIA layout options size (default: 1)', default=1)
+    parser.add_argument('-t', '--custom-config-size', type=int,
+                        help='VIA custom config size (default: 0)', default=0)
+    parser.add_argument('-l', '--layers', type=int,
+                        help='VIA keyboard layers (default: 4)', default=4)
+    parser.add_argument('-r', '--rows', type=int, help='VIA matrix rows')
+    parser.add_argument('-c', '--cols', type=int, help='VIA matrix columns')
+    parser.add_argument('-m', '--macros', type=int,
+                        help='VIA macro count (default: 16)', default=16)
+    parser.add_argument('-C', '--canonical', action='store_true',
+                        help='Canonical hex+ASCII display.')
+    parser.add_argument('-v', '--verbose', action='store_true', help='Verbose output')
+    parser.add_argument('input', help='Raw contents of the STM32 flash area used to emulate eeprom')
+    return parser.parse_args()
+
+
+def decodeEepromFEEA(in_file, size):
+    decoded=size*[None]
+    pos = 0
+    while True:
+        chunk = in_file.read(CHUNK_SIZE)
+        for i in range(0, len(chunk), 2):
+            decoded[pos] = unpack('B', chunk[i])[0]
+            pos += 1
+            if pos >= size:
+                break
+
+        if len(chunk) < CHUNK_SIZE or pos >= size:
+            break
+    return decoded
+
+def decodeEepromFEE9(in_file, size):
+    decoded=size*[None]
+    pos = 0
+    # Read compacted flash 
+    while True:
+        read_size = min(size - pos, CHUNK_SIZE)
+        chunk = in_file.read(read_size)
+        for i in range(len(chunk)):
+            decoded[pos] = unpack('B', chunk[i])[0] ^ 0xFF
+            pos += 1
+            if pos >= size:
+                break
+
+        if len(chunk) < read_size or pos >= size:
+            break
+    if VERBOSE:
+        print("COMPACTED EEPROM:")
+        dumpBinary(decoded, True)
+        print("WRITE LOG:")
+    # Read write log
+    while True:
+        entry = in_file.read(2)
+        if len(entry) < 2:
+            print("Partial log address at position 0x%04x" % pos, file=sys.stderr)
+            break
+        pos += 2
+
+        if entry == EMPTY_WORD:
+            break
+
+        be_entry = unpack('>H', entry)[0]
+        entry = unpack('H', entry)[0]
+        if not (entry & WORD_ENCODING):
+            address = entry >> 8
+            decoded[address] = entry & 0xFF
+            if VERBOSE:
+                print("[0x%04x]: BYTE 0x%02x = 0x%02x" % (be_entry, address, decoded[address]))
+        else:
+            if (entry & VALUE_NEXT) == VALUE_NEXT:
+                # Read next word as value
+                value = in_file.read(2)
+                if len(value) < 2:
+                    print("Partial log value at position 0x%04x" % pos, file=sys.stderr)
+                    break
+                pos += 2
+                address = entry & 0x1FFF
+                address <<= 1
+                address += BYTE_RANGE
+                decoded[address]   = unpack('B', value[0])[0] ^ 0xFF
+                decoded[address+1] = unpack('B', value[1])[0] ^ 0xFF
+                be_value = unpack('>H', value)[0]
+                if VERBOSE:
+                    print("[0x%04x 0x%04x]: WORD 0x%04x = 0x%02x%02x" % (be_entry, be_value, address, decoded[address+1], decoded[address]))
+            else:
+                # Reserved for future use
+                if entry & VALUE_RESERVED:
+                    if VERBOSE:
+                        print("[0x%04x]: RESERVED 0x%04x" % (be_entry, address))
+                    continue
+                address = entry & 0x1FFF
+                address <<= 1
+                decoded[address]   = (entry & VALUE_ENCODED) >> 13
+                decoded[address+1] = 0
+                if VERBOSE:
+                    print("[0x%04x]: ENCODED 0x%04x = 0x%02x%02x" % (be_entry, address, decoded[address+1], decoded[address]))
+
+    return decoded
+
+def dumpBinary(data, canonical):
+    def display(pos, row):
+        print("%04x" % pos, end='')
+        for i in range(len(row)):
+            if i % 8 == 0:
+                print(" ", end='')
+            char = row[i]
+            if char is None:
+                print("   ", end='')
+            else:
+                print(" %02x" % row[i], end='')
+        if canonical:
+            print("  |", end='')
+            for i in range(len(row)):
+                char = row[i]
+                if char is None:
+                    char = " "
+                else:
+                    char = chr(char)
+                if char not in PRINTABLE:
+                    char = "."
+                print(char, end='')
+            print("|", end='')
+
+        print("")
+
+    size = len(data)
+    empty_rows = 0
+    prev_row = ''
+    first_repeat = True
+    for pos in range(0, size, 16):
+        row=data[pos:pos+16]
+        row[len(row):16] = (16-len(row))*[None]
+        if row == prev_row:
+            if first_repeat:
+                print("*")
+                first_repeat = False
+        else:
+            first_repeat = True
+            display(pos, row)
+        prev_row = row
+    print("%04x" % (pos+16))
+
+def dumpEeconfig(data, eeconfig):
+    print("EECONFIG:")
+    for (name, pos, length) in eeconfig:
+        fmt = STRUCT_FMTS[length]
+        value = unpack(fmt, ''.join([chr(x) for x in data[pos:pos+length]]))[0]
+        print(("%%04x %%s = 0x%%0%dx" % (length * 2)) % (pos, name, value))
+
+def dumpVia(data, base, layers, cols, rows, macros,
+            layout_options_size, custom_config_size):
+    magicYear  = data[base + 0]
+    magicMonth = data[base + 1]
+    magicDay   = data[base + 2]
+    # Sanity check
+    if not 10 <= magicYear <= 0x99 or \
+       not 0 <= magicMonth <= 0x12 or \
+       not 0 <= magicDay <= 0x31:
+        print("ERROR: VIA Signature is not valid; Year:%x, Month:%x, Day:%x" % (magicYear, magicMonth, magicDay))
+        return
+    if cols is None or rows is None:
+        print("ERROR: VIA dump requires specifying --rows and --cols", file=sys.stderr)
+        return 2
+    print("VIA:")
+    # Decode magic
+    print("%04x MAGIC = 20%02x-%02x-%02x" % (base, magicYear, magicMonth, magicDay))
+    # Decode layout options
+    options = 0
+    pos = base + 3
+    for i in range(base+3, base+3+layout_options_size):
+        options = options << 8
+        options |= data[i]
+    print(("%%04x LAYOUT_OPTIONS = 0x%%0%dx" % (layout_options_size * 2)) % (pos, options))
+    pos += layout_options_size + custom_config_size
+    # Decode keycodes
+    keymap_size = layers * rows * cols * 2
+    if (pos + keymap_size) >= (len(data) - 1):
+        print("ERROR: VIA keymap requires %d bytes, but only %d available" % (keymap_size, len(data) - pos))
+        return 3
+    for layer in range(layers):
+        print("%s LAYER %d %s" % ('-'*int(cols*2.5), layer, '-'*int(cols*2.5)))
+        for row in range(rows):
+            print("%04x  | " % pos, end='')
+            for col in range(cols):
+                keycode = (data[pos] << 8) | (data[pos+1])
+                print(" %04x" % keycode, end='')
+                pos += 2
+            print("")
+    # Decode macros
+    for macro_num in range(macros):
+        macro = ""
+        macro_pos = pos
+        while pos < len(data):
+            char = chr(data[pos])
+            pos += 1
+            if char == '\x00':
+                print("%04x MACRO[%d] = '%s'" % (macro_pos, macro_num, macro))
+                break
+            else:
+                macro += char
+    return 0
+
+
+def decodeSTM32Eeprom(input, canonical, size=None, output=None, **kwargs):
+    input_size = os.path.getsize(input)
+    if size is None:
+        size = input_size >> 1
+
+    # Read the first few bytes to check magic signature
+    with open(input, 'rb') as in_file:
+        magic=in_file.read(4)
+        in_file.seek(0)
+
+        if magic == MAGIC_FEEA:
+            decoded = decodeEepromFEEA(in_file, size)
+            eeconfig = EECONFIG_V1
+            via_base = VIABASE_V1
+        elif magic[:2] == MAGIC_FEE9:
+            decoded = decodeEepromFEE9(in_file, size)
+            eeconfig = EECONFIG_V1
+            via_base = VIABASE_V1
+        else:
+            print("Unknown magic signature: %s" % " ".join(["0x%02x" % ord(x) for x in magic]), file=sys.stderr)
+            return 1
+
+    if output is not None:
+        with open(output, 'wb') as out_file:
+            out_file.write(pack('%dB' % len(decoded), *decoded))
+    print("DECODED EEPROM:")
+    dumpBinary(decoded, canonical)
+    dumpEeconfig(decoded, eeconfig)
+    if kwargs['rows'] is not None and kwargs['cols'] is not None:
+        return dumpVia(decoded, via_base, **kwargs)
+
+    return 0
+
+def main():
+    global VERBOSE
+    kwargs = vars(parseArgs())
+    VERBOSE = kwargs.pop('verbose')
+    return decodeSTM32Eeprom(**kwargs)
+
+if __name__ == '__main__':
+    sys.exit(main())