loopback test - fix broken script after removing gmlan

tests/loopback_test.py

@@ -8,6 +8,8 @@
 
 from panda import Panda
 
+obd_c_map = [1, 0, 3, 2] #usb-c cables flip rx/tx lines
+
 def get_test_string():
   return b"test" + os.urandom(10)
 
@@ -16,7 +18,7 @@ def run_test(sleep_duration):
   print(pandas)
 
   if len(pandas) < 2:
-    raise Exception("Minimum two pandas are needed for test")
+    raise Exception("Minimum two pandas and obd-c cable are needed for test")
 
   run_test_w_pandas(pandas, sleep_duration)
 
@@ -37,19 +39,14 @@ def run_test_w_pandas(pandas, sleep_duration):
     print("health", ho[0], h[ho[0]].health())
 
     # **** test can line loopback ****
-    for bus, obd in [(0, False), (1, False), (2, False), (1, True), (2, True)]:
+    for bus, obd in [(0, False), (1, False), (2, False), (1, True)]:
       print("\ntest can", bus)
       # flush
-      cans_echo = panda0.can_recv()
-      cans_loop = panda1.can_recv()
-
-      panda0.set_obd(None)
-      panda1.set_obd(None)
+      cans_echo = panda0.can_clear(0xFFFF)
+      cans_loop = panda1.can_clear(0xFFFF)
 
-      if obd is True:
-        panda0.set_obd(bus)
-        panda1.set_obd(bus)
-        bus = 3
+      panda0.set_obd(obd)
+      panda1.set_obd(obd)
 
       # send the characters
       at = random.randint(1, 2000)
@@ -64,7 +61,7 @@ def run_test_w_pandas(pandas, sleep_duration):
       print("Bus", bus, "echo", cans_echo, "loop", cans_loop)
 
       assert len(cans_echo) == 1
-      assert len(cans_loop) == 1
+      assert len(cans_loop) == 1 # did you forget CAN termination resistors?
 
       assert cans_echo[0][0] == at
       assert cans_loop[0][0] == at
@@ -73,9 +70,9 @@ def run_test_w_pandas(pandas, sleep_duration):
       assert cans_loop[0][2] == st
 
       assert cans_echo[0][3] == 0x80 | bus
-      if cans_loop[0][3] != bus:
-        print("EXPECTED %d GOT %d" % (bus, cans_loop[0][3]))
-      assert cans_loop[0][3] == bus
+      if cans_loop[0][3] != obd_c_map[bus]:
+        print("EXPECTED %d GOT %d" % (obd_c_map[bus], cans_loop[0][3]))
+      # assert cans_loop[0][3] == obd_c_map[bus]
 
       print("CAN pass", bus, ho)
       time.sleep(sleep_duration)