kline checksum algo was broken...

emmertex · Mar 1, 2018 · 9390961 · 9390961
1 parent 3b7c33b
commit 9390961
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/python/__init__.py b/python/__init__.py
@@ -468,6 +468,8 @@ def kline_drain(self, bus=2):
       ret = self._handle.controlRead(Panda.REQUEST_IN, 0xe0, bus, 0, 0x40)
       if len(ret) == 0:
         break
+      elif DEBUG:
+        print("kline drain: "+str(ret).encode("hex"))
       bret += ret
     return bytes(bret)
 
@@ -484,6 +486,7 @@ def kline_send(self, x, bus=2, checksum=True):
     def get_checksum(dat):
       result = 0
       result += sum(map(ord, dat)) if isinstance(b'dat', str) else sum(dat)
+      result = -result
       return struct.pack("B", result % 0x100)
 
     self.kline_drain(bus=bus)