Add support for RadioMaster Bandit Nano (#4005)

* Add support for RadioMaster Bandit Nano

* Add fan to init and sleep

src/mesh/NodeDB.cpp

@@ -292,6 +292,9 @@ void NodeDB::installDefaultConfig()
          meshtastic_Config_PositionConfig_PositionFlags_SPEED | meshtastic_Config_PositionConfig_PositionFlags_HEADING |
          meshtastic_Config_PositionConfig_PositionFlags_DOP | meshtastic_Config_PositionConfig_PositionFlags_SATINVIEW);
 
+#ifdef RADIOMASTER_900_BANDIT_NANO
+    config.display.flip_screen = true;
+#endif
 #ifdef T_WATCH_S3
     config.display.screen_on_secs = 30;
     config.display.wake_on_tap_or_motion = true;

src/mesh/RF95Interface.cpp

@@ -8,7 +8,10 @@
 #include "PortduinoGlue.h"
 #endif
 
-#define MAX_POWER 20
+#ifndef RF95_MAX_POWER
+#define RF95_MAX_POWER 20
+#endif
+
 // if we use 20 we are limited to 1% duty cycle or hw might overheat.  For continuous operation set a limit of 17
 // In theory up to 27 dBm is possible, but the modules installed in most radios can cope with a max of 20.  So BIG WARNING
 // if you set power to something higher than 17 or 20 you might fry your board.
@@ -49,8 +52,8 @@ bool RF95Interface::init()
 {
     RadioLibInterface::init();
 
-    if (power > MAX_POWER) // This chip has lower power limits than some
-        power = MAX_POWER;
+    if (power > RF95_MAX_POWER) // This chip has lower power limits than some
+        power = RF95_MAX_POWER;
 
     limitPower();
 
@@ -61,6 +64,13 @@ bool RF95Interface::init()
     digitalWrite(RF95_TCXO, 1);
 #endif
 
+    // enable PA
+#ifdef RF95_PA_EN
+#if defined(RF95_PA_DAC_EN)
+    dacWrite(RF95_PA_EN, RF95_PA_LEVEL);
+#endif
+#endif
+
     /*
     #define RF95_TXEN (22) // If defined, this pin should be set high prior to transmit (controls an external analog switch)
     #define RF95_RXEN (23) // If defined, this pin should be set high prior to receive (controls an external analog switch)
@@ -71,6 +81,11 @@ bool RF95Interface::init()
     digitalWrite(RF95_TXEN, 0);
 #endif
 
+#ifdef RF95_FAN_EN
+    pinMode(RF95_FAN_EN, OUTPUT);
+    digitalWrite(RF95_FAN_EN, 1);
+#endif
+
 #ifdef RF95_RXEN
     pinMode(RF95_RXEN, OUTPUT);
     digitalWrite(RF95_RXEN, 1);
@@ -146,10 +161,14 @@ bool RF95Interface::reconfigure()
     if (err != RADIOLIB_ERR_NONE)
         RECORD_CRITICALERROR(meshtastic_CriticalErrorCode_INVALID_RADIO_SETTING);
 
-    if (power > MAX_POWER) // This chip has lower power limits than some
-        power = MAX_POWER;
+    if (power > RF95_MAX_POWER) // This chip has lower power limits than some
+        power = RF95_MAX_POWER;
 
+#ifdef USE_RF95_RFO
+    err = lora->setOutputPower(power, true);
+#else
     err = lora->setOutputPower(power);
+#endif
     if (err != RADIOLIB_ERR_NONE)
         RECORD_CRITICALERROR(meshtastic_CriticalErrorCode_INVALID_RADIO_SETTING);
 
@@ -235,5 +254,9 @@ bool RF95Interface::sleep()
     setStandby(); // First cancel any active receiving/sending
     lora->sleep();
 
+#ifdef RF95_FAN_EN
+    digitalWrite(RF95_FAN_EN, 0);
+#endif
+
     return true;
 }

src/mesh/RadioLibRF95.cpp

@@ -42,7 +42,11 @@ int16_t RadioLibRF95::begin(float freq, float bw, uint8_t sf, uint8_t cr, uint8_
     state = setCodingRate(cr);
     RADIOLIB_ASSERT(state);
 
+#ifdef USE_RF95_RFO
+    state = setOutputPower(power, true);
+#else
     state = setOutputPower(power);
+#endif
     RADIOLIB_ASSERT(state);
 
     state = setGain(gain);