Merge pull request ArduPilot#24 from wvarty/private/wvarty/legacy-har…

…dware Added pulldown for older hardware
abasahmedd · Feb 6, 2020 · fa54342 · fa54342
2 parents ae5d2ec + 0a35b0b
commit fa54342
Show file tree

Hide file tree

Showing 2 changed files with 6 additions and 3 deletions.
diff --git a/src/src/targets.h b/src/src/targets.h
@@ -11,6 +11,7 @@
 #endif
 /// General Features ///
 #define FEATURE_OPENTX_SYNC //uncomment to use OpenTX packet sync feature (requires OpenTX 2.4 onwards) - this reduces latency.
+// #define LEGACY_HARDWARE // Uncomment for old TX modules with resistors on half duplex serial UART
 /////////////////////////
 
 #ifdef TARGET_TTGO_LORA_V1_AS_TX

diff --git a/src/src/tx_main.cpp b/src/src/tx_main.cpp
@@ -407,6 +407,11 @@ void DetectOtherRadios()
 
 void setup()
 {
+#ifdef LEGACY_HARDWARE
+  pinMode(4, INPUT_PULLDOWN);
+#endif
+  pinMode(36, INPUT_PULLUP);
+
   Serial.begin(115200);
   Serial.println("ExpressLRS TX Module Booted...");
 
@@ -415,9 +420,6 @@ void setup()
   // Get base mac address
   esp_read_mac(baseMac, ESP_MAC_WIFI_STA);
 
-  pinMode(4, INPUT_PULLUP);
-  pinMode(36, INPUT_PULLUP);
-
   // Print base mac address
   // This should be copied to common.h and is used to generate a unique hop sequence, DeviceAddr, and CRC.
   // TxBaseMac[0..2] are OUI (organisationally unique identifier) and are not ESP32 unique.  Do not use!