Simplify specification of test configs slightly

tests/pingpair_test/pingpair_test.pde

@@ -87,7 +87,7 @@ int receives_remaining = num_needed; //*< How many ack packets until we declare
 int failures_remaining = num_needed; //*< How many more failed sends until we declare failure? */
 const int interval = 100; //*< ms to wait between sends */
 
-char configuration = ' '; //*< Configuration key, one char sent in by the test framework to tell us how to configure, ' ' is default */
+char configuration = '1'; //*< Configuration key, one char sent in by the test framework to tell us how to configure, this is the default */
 
 void one_ok(void)
 {
@@ -109,6 +109,10 @@ void one_failed(void)
   }
 }
 
+//
+// Setup 
+//
+
 void setup(void)
 {
   //
@@ -165,10 +169,17 @@ void setup(void)
   // We will be using the Ack Payload feature, so please enable it
   radio.enableAckPayload();
 
-  switch(configuration)
+  if (configuration=='2')
   {
-    case ' ':
-    case '1':
+    // Config 2 is special radio config
+    radio.setCRCLength(RF24_CRC_8);
+    radio.setDataRate(RF24_2MBPS);
+    radio.setChannel(10);
+  }
+  else
+  {
+    //Otherwise, default radio config
+    
     // Optional: Increase CRC length for improved reliability
     radio.setCRCLength(RF24_CRC_16);
 
@@ -177,19 +188,6 @@ void setup(void)
 
     // Optional: Pick a high channel
     radio.setChannel(90);
-
-      break;
-    case '2':
-      // Optional: Increase CRC length for improved reliability
-      radio.setCRCLength(RF24_CRC_8);
-      radio.setDataRate(RF24_2MBPS);
-      radio.setChannel(10);
-      break;
-    default:
-      printf("ERROR Unknown configuration %c\n\r",configuration);
-      done = true;
-      passed = false;
-      break;
   }
  
   // enable dynamic payloads
@@ -232,6 +230,9 @@ void setup(void)
   attachInterrupt(0, check_radio, FALLING);
 }
 
+//
+// Loop 
+//
 
 static uint32_t message_count = 0;
 static uint32_t last_message_count = 0;