techo_lite: fixed RF switch

variants/lilygo_techo_lite/TechoBoard.cpp

@@ -28,4 +28,30 @@ uint16_t TechoBoard::getBattMilliVolts() {
   // divider into account (providing the actual LIPO voltage)
   return (uint16_t)((float)adcvalue * REAL_VBAT_MV_PER_LSB);
 }
+
+void TechoBoard::setRfSwitchTx(bool tx) {
+  if (tx) { // TX
+    digitalWrite(S68F_RF_VC1, HIGH);
+    digitalWrite(S68F_RF_VC2, LOW);
+  } else { // RX
+    digitalWrite(S68F_RF_VC1, LOW);
+    digitalWrite(S68F_RF_VC2, HIGH);
+  }
+}
+
+void TechoBoard::onBeforeTransmit() {
+  // RF switching NOT handled by RadioLib via SX126X_DIO2_AS_RF_SWITCH and setRfSwitchPins()
+#if defined(P_LORA_TX_LED)
+  digitalWrite(P_LORA_TX_LED, LOW);  // TX LED on
+#endif
+  TechoBoard::setRfSwitchTx(true);
+}
+
+void TechoBoard::onAfterTransmit() {
+  TechoBoard::setRfSwitchTx(false);
+#if defined(P_LORA_TX_LED)
+  digitalWrite(P_LORA_TX_LED, HIGH);   // TX LED off
+#endif
+}
+
 #endif

variants/lilygo_techo_lite/TechoBoard.h

@@ -14,10 +14,14 @@
 #define REAL_VBAT_MV_PER_LSB (VBAT_DIVIDER_COMP * VBAT_MV_PER_LSB)
 
 class TechoBoard : public NRF52BoardDCDC {
+private:
+  void setRfSwitchTx(bool tx);
 public:
   TechoBoard() : NRF52Board("TECHO_OTA") {}
   void begin();
   uint16_t getBattMilliVolts() override;
+  void onBeforeTransmit() override;
+  void onAfterTransmit() override;
 
   const char* getManufacturerName() const override {
     return "LilyGo T-Echo";

variants/lilygo_techo_lite/platformio.ini

@@ -14,7 +14,7 @@ build_flags = ${nrf52_base.build_flags}
   -D SX126X_POWER_EN=30
   -D SX126X_CURRENT_LIMIT=140
   -D SX126X_RX_BOOSTED_GAIN=1
-  -D P_LORA_TX_LED=LED_GREEN
+  -D P_LORA_TX_LED=LED_RED
   -D DISABLE_DIAGNOSTIC_OUTPUT
   -D ENV_INCLUDE_GPS=1
   -D GPS_BAUD_RATE=9600

variants/lilygo_techo_lite/variant.cpp

@@ -20,6 +20,12 @@ void initVariant() {
   pinMode(PIN_BUTTON1, INPUT_PULLUP);
   pinMode(PIN_BUTTON2, INPUT_PULLUP);
 
+  pinMode(S68F_RF_VC1, OUTPUT);
+  pinMode(S68F_RF_VC2, OUTPUT);
+  // TX
+  digitalWrite(S68F_RF_VC1, HIGH);
+  digitalWrite(S68F_RF_VC2, LOW);
+
   pinMode(LED_RED, OUTPUT);
   pinMode(LED_GREEN, OUTPUT);
   pinMode(LED_BLUE, OUTPUT);

variants/lilygo_techo_lite/variant.h

@@ -10,6 +10,27 @@
 
 #include "WVariant.h"
 
+// # T-Echo-Lite_V1.0.pdf
+// S68F
+// ====
+// * RF_VC1 <-- P0.27
+// * RF_VC2 <-- P1.01
+// * DIO1   <-> P1.08
+// * DIO2   <-> P0.05
+//
+// # EK-S62F_UserGuide_Ver.A.pdf
+// MODE A
+// ------
+// Tx/Rx RF_VC1 RF_VC2
+//  Tx     H      L
+//  Rx     L      H
+//
+// MODE B
+// ------
+// DIO2 --- RF_VC1
+// RF_VC2 = H -> NON SLEEP
+// RF_VC2 = L -> SLEEP
+
 ////////////////////////////////////////////////////////////////////////////////
 // Low frequency clock source
 
@@ -76,7 +97,7 @@
 ////////////////////////////////////////////////////////////////////////////////
 // Builtin LEDs
 
-#define LED_RED                 _PINNUM(1, 14) // LED_3
+#define LED_RED                 _PINNUM(1, 14) // LED_3 (CORE)
 #define LED_BLUE                _PINNUM(1, 5)  // LED_2
 #define LED_GREEN               _PINNUM(1, 7)  // LED_1
 
@@ -107,8 +128,8 @@
 #define SX126X_DIO1             _PINNUM(1, 8)
 #define SX126X_BUSY             _PINNUM(0, 14)
 #define SX126X_RESET            _PINNUM(0, 7)
-#define SX126X_RF_VC1           _PINNUM(0, 27)
-#define SX126X_RF_VC2           _PINNUM(0, 33)
+#define S68F_RF_VC1             _PINNUM(0, 27)
+#define S68F_RF_VC2             _PINNUM(1, 1)
 
 #define P_LORA_DIO_1            SX126X_DIO1
 #define P_LORA_NSS              LORA_CS