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);

src/platform/esp32/architecture.h

@@ -145,6 +145,8 @@
 #define HW_VENDOR meshtastic_HardwareModel_UNPHONE
 #elif defined(WIPHONE)
 #define HW_VENDOR meshtastic_HardwareModel_WIPHONE
+#elif defined(RADIOMASTER_900_BANDIT_NANO)
+#define HW_VENDOR meshtastic_HardwareModel_RADIOMASTER_900_BANDIT_NANO
 #endif
 
 // -----------------------------------------------------------------------------

variants/radiomaster_900_bandit_nano/platformio.ini

@@ -0,0 +1,15 @@
+[env:radiomaster_900_bandit_nano]
+extends = esp32_base
+board = esp32doit-devkit-v1
+board_level = extra
+build_flags =
+  ${esp32_base.build_flags}
+  -DRADIOMASTER_900_BANDIT_NANO
+  -DVTABLES_IN_FLASH=1
+  -DCONFIG_DISABLE_HAL_LOCKS=1
+  -O2
+  -Ivariants/radiomaster_900_bandit_nano
+board_build.f_cpu = 240000000L
+upload_protocol = esptool
+lib_deps =
+  ${esp32_base.lib_deps}

variants/radiomaster_900_bandit_nano/variant.h

@@ -0,0 +1,84 @@
+/*
+ Initial settings and work by https://github.com/uberhalit and re-work by https://github.com/gjelsoe
+ Unit provided by Radio Master RC
+ https://radiomasterrc.com/products/bandit-nano-expresslrs-rf-module with 0.96" OLED display
+*/
+
+/*
+  I2C SDA and SCL.
+*/
+#define I2C_SDA 14
+#define I2C_SCL 12
+
+/*
+  No GPS - but free solder pads are available inside the case.
+*/
+#undef GPS_RX_PIN
+#undef GPS_TX_PIN
+
+/*
+  Pin connections from ESP32-D0WDQ6 to SX1276.
+*/
+#define LORA_DIO0 22
+#define LORA_DIO1 21
+#define LORA_SCK 18
+#define LORA_MISO 19
+#define LORA_MOSI 23
+#define LORA_CS 4
+#define LORA_RESET 5
+#define LORA_TXEN 33
+
+/*
+  This unit has a FAN built-in.
+  FAN is active at 250mW on it's ExpressLRS Firmware.
+*/
+#define RF95_FAN_EN 2
+
+/*
+  LED PIN setup.
+*/
+#define LED_PIN 15
+
+/*
+  Five way button when using ADC.
+  2.632V, 2.177V, 1.598V, 1.055V, 0V
+
+  Possible ADC Values:
+  { UP, DOWN, LEFT, RIGHT, ENTER, IDLE }
+  3227, 0 ,1961, 2668, 1290, 4095
+*/
+#define BUTTON_PIN 39
+#define BUTTON_NEED_PULLUP
+
+#define SCREEN_ROTATE
+
+/*
+  No External notification.
+*/
+#undef EXT_NOTIFY_OUT
+
+/*
+  Remapping PIN Names.
+  Note, that this unit uses RFO
+*/
+#define USE_RF95
+#define USE_RF95_RFO
+#define RF95_CS LORA_CS
+#define RF95_DIO1 LORA_DIO1
+#define RF95_TXEN LORA_TXEN
+#define RF95_RESET LORA_RESET
+#define RF95_MAX_POWER 12
+
+/*
+  This module has Skyworks SKY66122 controlled by dacWrite
+  power rangeing from 100mW to 1000mW.
+
+  Mapping of PA_LEVEL to Power output: GPIO26/dacWrite
+  168 -> 100mW  -> 2.11v
+  148 -> 250mW  -> 1.87v
+  128 -> 500mW  -> 1.63v
+  90  -> 1000mW -> 1.16v
+*/
+#define RF95_PA_EN 26
+#define RF95_PA_DAC_EN
+#define RF95_PA_LEVEL 90