i2c eeprom flash script

1 files changed, 50 insertions, 0 deletions

diff --git a/flash.py b/flash.py
new file mode 100644
index 0000000..6a29159
--- /dev/null
+++ b/flash.py
@@ -0,0 +1,50 @@
+# usage:
+#  glasgow script flash.py i2c-controller -V 3.3
+import struct
+import sys
+import time
+
+addr = 0x50
+size = 0x2000
+
+ini = b"""
+[FzgParam]
+Fahrzeugadresse=11111111
+MontageplattenNr=22222222
+[TestMode]
+0=if [ -e /init/efad/mp_sd/autorun.sh ]; then systemctl stop init-abtproxy; sh /init/efad/mp_sd/autorun.sh; else systemctl --no-block start nx; fi
+""".lstrip()
+write_data = ini.strip().replace(b'\n', b'\r\n').ljust(size, b'\xff')
+
+await i2c_iface.write(addr, struct.pack('>h', 0))
+print("reading eeprom data")
+read_data = await i2c_iface.read(addr, len(write_data))
+if read_data == write_data:
+  print("already written, skipping")
+  sys.exit(0)
+else:
+  print(f"overwriting eeprom data: {read_data.hex()}")
+
+chunk_size = 32
+for i in range(0, size, chunk_size):
+  read_chunk = read_data[i:i+chunk_size]
+  write_chunk = write_data[i:i+chunk_size]
+  if read_chunk == write_chunk:
+    continue
+  print(f"writing chunk {struct.pack('>h', i).hex()}")
+  await i2c_iface.write(addr, struct.pack('>h', i) + write_chunk)
+  time.sleep(0.01)
+  print("wrote, reading back")
+  await i2c_iface.write(addr, struct.pack('>h', i))
+  read_chunk = await i2c_iface.read(addr, chunk_size)
+  if read_chunk == write_chunk:
+    print(f"wrote {i+chunk_size}")
+print("write complete")
+await i2c_iface.write(addr, struct.pack('>h', 0))
+read_data = await i2c_iface.read(addr, len(write_data))
+if read_data == write_data:
+  print("read back successful")
+else:
+  print("read back unsuccessful")
+  print(f"expected: {write_data.hex()}")
+  print(f"     got: {read_data.hex()}")