add heltec meshpocket board.

variants/mesh_pocket/MeshPocket.h

@@ -0,0 +1,45 @@
+#pragma once
+
+#include <Arduino.h>
+#include <MeshCore.h>
+
+// built-ins
+#define  PIN_VBAT_READ    29
+#define  PIN_BAT_CTL      34
+#define  MV_LSB   (3000.0F / 4096.0F) // 12-bit ADC with 3.0V input range
+
+class HeltecMeshPocket : public mesh::MainBoard {
+protected:
+  uint8_t startup_reason;
+
+public:
+  void begin();
+  uint8_t getStartupReason() const override { return startup_reason; }
+
+
+
+  uint16_t getBattMilliVolts() override {
+    int adcvalue = 0;
+    analogReadResolution(12);
+    analogReference(AR_INTERNAL_3_0);
+    pinMode(PIN_BAT_CTL, OUTPUT);          // battery adc can be read only ctrl pin set to high
+    pinMode(PIN_VBAT_READ, INPUT);
+    digitalWrite(PIN_BAT_CTL, HIGH);
+
+    delay(10);
+    adcvalue = analogRead(PIN_VBAT_READ);
+    digitalWrite(PIN_BAT_CTL, LOW);
+
+    return (uint16_t)((float)adcvalue * MV_LSB * 4.9);
+  }
+
+  const char* getManufacturerName() const override {
+    return "Heltec MeshPocket";
+  }
+
+  void reboot() override {
+    NVIC_SystemReset();
+  }
+
+  bool startOTAUpdate(const char* id, char reply[]) override;
+};