Add heltec -v4-r8 board

variants/heltec_v4_r8/HeltecV4R8Board.cpp

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+#include "HeltecV4R8Board.h"
+
+void HeltecV4R8Board::begin() {
+  ESP32Board::begin();
+
+  periph_power.begin();
+  periph_power.claim();  // R8 VEXT also feeds the LoRa antenna boost rail.
+
+  loRaFEMControl.init();
+
+#ifdef PIN_TOUCH_RST
+  pinMode(PIN_TOUCH_RST, OUTPUT);
+  digitalWrite(PIN_TOUCH_RST, HIGH);
+#endif
+
+  esp_reset_reason_t reason = esp_reset_reason();
+  if (reason == ESP_RST_DEEPSLEEP) {
+    long wakeup_source = esp_sleep_get_ext1_wakeup_status();
+    if (wakeup_source & (1 << P_LORA_DIO_1)) {
+      startup_reason = BD_STARTUP_RX_PACKET;
+    }
+
+    rtc_gpio_hold_dis((gpio_num_t)P_LORA_NSS);
+    rtc_gpio_deinit((gpio_num_t)P_LORA_DIO_1);
+  }
+}
+
+void HeltecV4R8Board::onBeforeTransmit(void) {
+  digitalWrite(P_LORA_TX_LED, HIGH);
+  loRaFEMControl.setTxModeEnable();
+}
+
+void HeltecV4R8Board::onAfterTransmit(void) {
+  digitalWrite(P_LORA_TX_LED, LOW);
+  loRaFEMControl.setRxModeEnable();
+}
+
+void HeltecV4R8Board::enterDeepSleep(uint32_t secs, int pin_wake_btn) {
+  esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_ON);
+
+  rtc_gpio_set_direction((gpio_num_t)P_LORA_DIO_1, RTC_GPIO_MODE_INPUT_ONLY);
+  rtc_gpio_pulldown_en((gpio_num_t)P_LORA_DIO_1);
+
+  rtc_gpio_hold_en((gpio_num_t)P_LORA_NSS);
+  loRaFEMControl.setRxModeEnableWhenMCUSleep();
+
+  if (pin_wake_btn < 0) {
+    esp_sleep_enable_ext1_wakeup((1L << P_LORA_DIO_1), ESP_EXT1_WAKEUP_ANY_HIGH);
+  } else {
+    esp_sleep_enable_ext1_wakeup((1L << P_LORA_DIO_1) | (1L << pin_wake_btn), ESP_EXT1_WAKEUP_ANY_HIGH);
+  }
+
+  if (secs > 0) {
+    esp_sleep_enable_timer_wakeup(secs * 1000000);
+  }
+
+  esp_deep_sleep_start();
+}
+
+void HeltecV4R8Board::powerOff() {
+  enterDeepSleep(0);
+}
+
+uint16_t HeltecV4R8Board::getBattMilliVolts() {
+  analogReadResolution(12);
+
+  uint32_t raw = 0;
+  for (int i = 0; i < 8; i++) {
+    raw += analogRead(PIN_VBAT_READ);
+  }
+  raw = raw / 8;
+
+  return (adc_mult * (3.3f / 4096.0f) * raw) * 1000;
+}
+
+const char* HeltecV4R8Board::getManufacturerName() const {
+#ifdef HELTEC_V4_R8_TFT
+  return "Heltec V4 R8 TFT";
+#else
+  return "Heltec V4 R8 OLED";
+#endif
+}