MeshCoreTel-firmware/variants/nano_g2_ultra/nano-g2.cpp

#include <Arduino.h>
#include "nano-g2.h"

#ifdef NANO_G2_ULTRA

#include <bluefruit.h>
#include <Wire.h>

static BLEDfu bledfu;

static void connect_callback(uint16_t conn_handle)
{
  (void)conn_handle;
  MESH_DEBUG_PRINTLN("BLE client connected");
}

static void disconnect_callback(uint16_t conn_handle, uint8_t reason)
{
  (void)conn_handle;
  (void)reason;

  MESH_DEBUG_PRINTLN("BLE client disconnected");
}

void NanoG2Ultra::begin()
{
  // for future use, sub-classes SHOULD call this from their begin()
  startup_reason = BD_STARTUP_NORMAL;

  pinMode(PIN_BUTTON1, INPUT);
  // the external notification circuit is shared for both buzzer and led
  // need to find out the switch state or somehow write a function that can
  // sound the buzzer or signal the led. the led will stay on once brought HIGH
  // and can be then brought LOW. It turns off with a hardware btn.
  pinMode(EXT_NOTIFY_OUT, OUTPUT);
  digitalWrite(EXT_NOTIFY_OUT, LOW);

  Wire.begin();
  pinMode(SX126X_POWER_EN, OUTPUT);
  digitalWrite(SX126X_POWER_EN, HIGH);

  delay(10);
}

uint16_t NanoG2Ultra::getBattMilliVolts()
{
  int adcvalue = 0;

  analogReference(AR_INTERNAL_3_0);
  analogReadResolution(12);
  delay(10);

  // ADC range is 0..3000mV and resolution is 12-bit (0..4095)
  adcvalue = analogRead(PIN_VBAT_READ);
  // Convert the raw value to compensated mv, taking the resistor-
  // divider into account (providing the actual LIPO voltage)
  return (uint16_t)((float)adcvalue * REAL_VBAT_MV_PER_LSB);
}

bool NanoG2Ultra::startOTAUpdate(const char *id, char reply[])
{
  // Config the peripheral connection with maximum bandwidth
  // more SRAM required by SoftDevice
  // Note: All config***() function must be called before begin()
  Bluefruit.configPrphBandwidth(BANDWIDTH_MAX);
  Bluefruit.configPrphConn(92, BLE_GAP_EVENT_LENGTH_MIN, 16, 16);

  Bluefruit.begin(1, 0);
  // Set max power. Accepted values are: -40, -30, -20, -16, -12, -8, -4, 0, 4
  Bluefruit.setTxPower(4);
  // Set the BLE device name
  Bluefruit.setName("TECHO_OTA");

  Bluefruit.Periph.setConnectCallback(connect_callback);
  Bluefruit.Periph.setDisconnectCallback(disconnect_callback);

  // To be consistent OTA DFU should be added first if it exists
  bledfu.begin();

  // Set up and start advertising
  // Advertising packet
  Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
  Bluefruit.Advertising.addTxPower();
  Bluefruit.Advertising.addName();

  /* Start Advertising
    - Enable auto advertising if disconnected
    - Interval:  fast mode = 20 ms, slow mode = 152.5 ms
    - Timeout for fast mode is 30 seconds
    - Start(timeout) with timeout = 0 will advertise forever (until connected)

    For recommended advertising interval
    https://developer.apple.com/library/content/qa/qa1931/_index.html
  */
  Bluefruit.Advertising.restartOnDisconnect(true);
  Bluefruit.Advertising.setInterval(32, 244); // in unit of 0.625 ms
  Bluefruit.Advertising.setFastTimeout(30);   // number of seconds in fast mode
  Bluefruit.Advertising.start(0);             // 0 = Don't stop advertising after n seconds

  strcpy(reply, "OK - started");
  return true;
}
#endif