Initial commit: Simple Sensor firmware for Heltec T114 with BME280

- MeshCore-based Simple Sensor firmware
- Heltec T114 without display
- BME280 sensor support (temp/humidity/pressure)
- Radio: 868.856018 MHz, SF7, BW62.5 kHz, CR4/7
- 2-byte path hash
- PlatformIO project

variants/wio-e5-mini/target.cpp

@@ -0,0 +1,94 @@
+#include <Arduino.h>
+#include "target.h"
+#include <helpers/ArduinoHelpers.h>
+
+WIOE5Board board;
+
+RADIO_CLASS radio = new STM32WLx_Module();
+
+WRAPPER_CLASS radio_driver(radio, board);
+
+static const uint32_t rfswitch_pins[] = {PA4,  PA5,  RADIOLIB_NC, RADIOLIB_NC, RADIOLIB_NC};
+static const Module::RfSwitchMode_t rfswitch_table[] = {
+  {STM32WLx::MODE_IDLE,  {LOW,  LOW}},
+  {STM32WLx::MODE_RX,    {HIGH, LOW}},
+  {STM32WLx::MODE_TX_HP, {LOW, HIGH}},  // for LoRa-E5 mini
+//  {STM32WLx::MODE_TX_LP, {HIGH, HIGH}},   // for LoRa-E5-LE mini
+  END_OF_MODE_TABLE,
+};
+
+VolatileRTCClock rtc_clock;
+WIOE5SensorManager sensors;
+
+#ifdef DISPLAY_CLASS
+  NullDisplayDriver display;
+#endif
+
+#ifndef LORA_CR
+  #define LORA_CR      5
+#endif
+
+bool radio_init() {
+  Wire.begin();
+
+  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, 16, 1.7, 0);
+
+  if (status != RADIOLIB_ERR_NONE) {
+    Serial.print("ERROR: radio init failed: ");
+    Serial.println(status);
+    return false;  // fail
+  }
+    
+  #ifdef RX_BOOSTED_GAIN
+    radio.setRxBoostedGainMode(RX_BOOSTED_GAIN);
+  #endif
+ 
+  radio.setCRC(1);
+  
+  return true;  // success
+}
+
+uint32_t radio_get_rng_seed() {
+  return radio.random(0x7FFFFFFF);
+}
+
+void radio_set_params(float freq, float bw, uint8_t sf, uint8_t cr) {
+  radio.setFrequency(freq);
+  radio.setSpreadingFactor(sf);
+  radio.setBandwidth(bw);
+  radio.setCodingRate(cr);
+}
+
+void radio_set_tx_power(int8_t dbm) {
+  radio.setOutputPower(dbm);
+}
+
+mesh::LocalIdentity radio_new_identity() {
+  RadioNoiseListener rng(radio);
+  return mesh::LocalIdentity(&rng);  // create new random identity
+}
+
+bool WIOE5SensorManager::querySensors(uint8_t requester_permissions, CayenneLPP& telemetry) { 
+  if (!has_bme) return false;
+
+  float temp(NAN), hum(NAN), pres(NAN);
+
+  BME280::TempUnit tempUnit(BME280::TempUnit_Celsius);
+  BME280::PresUnit presUnit(BME280::PresUnit_hPa);
+
+  bme.read(pres, temp, hum, tempUnit, presUnit);
+
+  telemetry.addTemperature(TELEM_CHANNEL_SELF, temp);
+  telemetry.addRelativeHumidity(TELEM_CHANNEL_SELF, hum);
+  telemetry.addBarometricPressure(TELEM_CHANNEL_SELF, pres);
+
+  return true; 
+}
+
+bool WIOE5SensorManager::begin() {
+  has_bme = bme.begin();
+
+  return has_bme;
+}