Changes to get Wireless paper Voltage.

variants/heltec_wireless_paper/HeltecV3WirelessPaper.h

@@ -0,0 +1,98 @@
+#pragma once
+
+#include <Arduino.h>
+#include <helpers/RefCountedDigitalPin.h>
+#include <helpers/ESP32Board.h>
+
+// built-ins
+#ifndef PIN_VBAT_READ              // set in platformio.ini for boards like Heltec Wireless Paper (20)
+  #define  PIN_VBAT_READ    1
+#endif
+#ifndef PIN_ADC_CTRL              // set in platformio.ini for Heltec Wireless Tracker (2)
+  #define  PIN_ADC_CTRL    37
+#endif
+#define  PIN_ADC_CTRL_ACTIVE    LOW
+#define  PIN_ADC_CTRL_INACTIVE  HIGH
+
+#include <driver/rtc_io.h>
+
+class HeltecV3WirelessPaper : public ESP32Board {
+private:
+  bool adc_active_state;
+
+public:
+  RefCountedDigitalPin periph_power;
+
+  HeltecV3WirelessPaper() : periph_power(PIN_VEXT_EN) { }
+
+  void begin() {
+    ESP32Board::begin();
+
+    // Auto-detect correct ADC_CTRL pin polarity (different for boards >3.2)
+    pinMode(PIN_ADC_CTRL, INPUT);
+    adc_active_state = !digitalRead(PIN_ADC_CTRL);
+
+    pinMode(PIN_ADC_CTRL, OUTPUT);
+    digitalWrite(PIN_ADC_CTRL, !adc_active_state); // Initially inactive
+
+    periph_power.begin();
+
+    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)) {  // received a LoRa packet (while in deep sleep)
+        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 enterDeepSleep(uint32_t secs, int pin_wake_btn = -1) {
+    esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_ON);
+
+    // Make sure the DIO1 and NSS GPIOs are hold on required levels during deep sleep
+    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);
+
+    if (pin_wake_btn < 0) {
+      esp_sleep_enable_ext1_wakeup( (1L << P_LORA_DIO_1), ESP_EXT1_WAKEUP_ANY_HIGH);  // wake up on: recv LoRa packet
+    } else {
+      esp_sleep_enable_ext1_wakeup( (1L << P_LORA_DIO_1) | (1L << pin_wake_btn), ESP_EXT1_WAKEUP_ANY_HIGH);  // wake up on: recv LoRa packet OR wake btn
+    }
+
+    if (secs > 0) {
+      esp_sleep_enable_timer_wakeup(secs * 1000000);
+    }
+
+    // Finally set ESP32 into sleep
+    esp_deep_sleep_start();   // CPU halts here and never returns!
+  }
+
+  void powerOff() override {
+    enterDeepSleep(0);
+  }
+
+  uint16_t getBattMilliVolts() override {
+    analogReadResolution(10);
+    digitalWrite(PIN_ADC_CTRL, adc_active_state);
+    MESH_DEBUG_PRINT("ADC CTRL pin set to active state %d\n", adc_active_state);
+
+    uint32_t raw = 0;
+    for (int i = 0; i < 8; i++) {
+      raw += analogRead(PIN_VBAT_READ);
+    }
+
+    digitalWrite(PIN_ADC_CTRL, !adc_active_state);
+    uint32_t voltage = (0.842 * (4.2 / 1024.0) * raw) * 1000;
+
+    return voltage;
+  }
+
+  const char* getManufacturerName() const override {
+    return "Heltec Wireless Paper";
+  }
+};

variants/heltec_wireless_paper/target.cpp

@@ -1,7 +1,7 @@
 #include "target.h"
 #include <Arduino.h>
 
-HeltecV3Board board;
+HeltecV3WirelessPaper board;
 
 #if defined(P_LORA_SCLK)
   static SPIClass spi;

variants/heltec_wireless_paper/target.h

@@ -3,7 +3,7 @@
 #define RADIOLIB_STATIC_ONLY 1
 #include <RadioLib.h>
 #include <helpers/radiolib/RadioLibWrappers.h>
-#include <../heltec_v3/HeltecV3Board.h>
+#include "HeltecV3WirelessPaper.h"
 #include <helpers/radiolib/CustomSX1262Wrapper.h>
 #include <helpers/AutoDiscoverRTCClock.h>
 #include <helpers/SensorManager.h>
@@ -12,7 +12,7 @@
 #include <helpers/ui/MomentaryButton.h>
 #endif
 
-extern HeltecV3Board board;
+extern HeltecV3WirelessPaper board;
 extern WRAPPER_CLASS radio_driver;
 extern AutoDiscoverRTCClock rtc_clock;
 extern SensorManager sensors;