Fixing loader bug when users is printing lots of text

User's sketch may be hammering on serial port as we wait for bootload command. Ignore unknowns up to 10 times.

Author: Nathan Seidle

tools/artemis/artemis_uart_loader.py

@@ -97,16 +97,16 @@ def main():
 
             response = ser.read()
 
-        if(ord(response) == BL_COMMAND_ANNOUNCE):
-            # Respond with 'AOK'
-            # values = bytearray([6])
-            ser.write(BL_COMMAND_AOK.to_bytes(1, byteorder='big'))
+            if(ord(response) == BL_COMMAND_ANNOUNCE):
+                # Respond with 'AOK'
+                # values = bytearray([6])
+                ser.write(BL_COMMAND_AOK.to_bytes(1, byteorder='big'))
 
-            verboseprint("Bootload response received")
-        else:
-            print("Unkown response: " + str(ord(response)) +
-                  ". Perhaps you have the wrong port?")
-            exit()
+                verboseprint("Bootload response received")
+                break
+            else:
+                verboseprint("Unkown response: " + str(ord(response)))
+                response = ''
 
         # Send upload baud rate
         baud_in_bytes = args.baud.to_bytes(4, byteorder='big')
@@ -198,6 +198,9 @@ def main():
 
                 if end > totalLen:
                     end = totalLen
+            else:
+                print("Unknown BL response")
+                exit()
 
     exit()