rak3x72: support variations in platformio.ini

variants/rak3x72/platformio.ini

@@ -7,14 +7,15 @@ build_flags = ${stm32_base.build_flags}
   -D WRAPPER_CLASS=CustomSTM32WLxWrapper
   -D SPI_INTERFACES_COUNT=0
   -D RX_BOOSTED_GAIN=true
+;  -D STM32WL_TCXO_VOLTAGE=1.6 ; defaults to 0 if undef
+;  -D LORA_TX_POWER=14 ; Defaults to 22 for HP, 14 is for LP version
   -I variants/rak3x72
 build_src_filter = ${stm32_base.build_src_filter}
   +<../variants/rak3x72>
 
 [env:rak3x72-repeater]
 extends = rak3x72
 build_flags = ${rak3x72.build_flags}
-  -D LORA_TX_POWER=22
   -D ADVERT_NAME='"RAK3x72 Repeater"'
   -D ADMIN_PASSWORD='"password"'
 build_src_filter = ${rak3x72.build_src_filter}
@@ -24,7 +25,6 @@ build_src_filter = ${rak3x72.build_src_filter}
 extends = rak3x72
 build_flags = ${rak3x72.build_flags}
 ;  -D FORMAT_FS=true
-  -D LORA_TX_POWER=22
   -D MAX_CONTACTS=100
   -D MAX_GROUP_CHANNELS=8
 build_src_filter = ${rak3x72.build_src_filter}

variants/rak3x72/target.cpp

@@ -24,12 +24,21 @@ SensorManager sensors;
   #define LORA_CR      5
 #endif
 
+#ifndef STM32WL_TCXO_VOLTAGE
+  // TCXO set to 0 for RAK3172
+  #define STM32WL_TCXO_VOLTAGE 0
+#endif
+
+#ifndef LORA_TX_POWER
+  #define LORA_TX_POWER 22
+#endif
+
 bool radio_init() {
 //  rtc_clock.begin(Wire);
 
   radio.setRfSwitchTable(rfswitch_pins, rfswitch_table);
 
-  int status = radio.begin(LORA_FREQ, LORA_BW, LORA_SF, LORA_CR, RADIOLIB_SX126X_SYNC_WORD_PRIVATE, LORA_TX_POWER, 8, 0, 0); // TCXO set to 0 for RAK3172
+  int status = radio.begin(LORA_FREQ, LORA_BW, LORA_SF, LORA_CR, RADIOLIB_SX126X_SYNC_WORD_PRIVATE, LORA_TX_POWER, 8, STM32WL_TCXO_VOLTAGE, 0); 
 
   if (status != RADIOLIB_ERR_NONE) {
     Serial.print("ERROR: radio init failed: ");

variants/rak3x72/target.h

@@ -18,8 +18,12 @@ class RAK3x72Board : public STM32Board {
     }
 
     uint16_t getBattMilliVolts() override {
-        uint32_t raw = analogRead(PIN_VBAT_READ);            
-        return (ADC_MULTIPLIER * raw) / 1024;
+        analogReadResolution(12);
+        uint32_t raw = 0;
+        for (int i=0; i<8;i++) {
+            raw += analogRead(PIN_VBAT_READ);
+        }            
+        return ((double)raw) * ADC_MULTIPLIER / 8 / 4096;
     }
 };