* new target/env: Heltec_v2_terminal_chat

examples/simple_secure_chat/main.cpp

@@ -53,7 +53,11 @@
   #include <helpers/HeltecV3Board.h>
   #include <helpers/CustomSX1262Wrapper.h>
   static HeltecV3Board board;
-#elif defined(ARDUINO_XIAO_ESP32C3)
+  #elif defined(HELTEC_LORA_V2)
+  #include <helpers/HeltecV2Board.h>
+  #include <helpers/CustomSX1276Wrapper.h>
+  static HeltecV2Board board;
+  #elif defined(ARDUINO_XIAO_ESP32C3)
   #include <helpers/XiaoC3Board.h>
   #include <helpers/CustomSX1262Wrapper.h>
   #include <helpers/CustomSX1268Wrapper.h>

platformio.ini

@@ -29,13 +29,32 @@ monitor_filters = esp32_exception_decoder
 extra_scripts = merge-bin.py
 build_src_filter = ${arduino_base.build_src_filter}
 
-[Heltec_stick_lite]
-extends = esp32_base
-board = heltec_wireless_stick_lite
-
+; ================
 [Heltec_lora32_v2]
 extends = esp32_base
 board = heltec_wifi_lora_32_V2
+build_flags =
+  ${esp32_base.build_flags} 
+  -D HELTEC_LORA_V2
+  -D RADIO_CLASS=CustomSX1276
+  -D WRAPPER_CLASS=CustomSX1276Wrapper
+  -D LORA_TX_POWER=20
+  -D P_LORA_TX_LED=25
+build_src_filter = ${esp32_base.build_src_filter}
+
+[env:Heltec_v2_terminal_chat]
+extends = Heltec_lora32_v2
+build_flags =
+  ${Heltec_lora32_v2.build_flags} 
+  -D MAX_CONTACTS=100
+  -D MAX_GROUP_CHANNELS=1
+;  -D MESH_PACKET_LOGGING=1
+;  -D MESH_DEBUG=1
+build_src_filter = ${Heltec_lora32_v2.build_src_filter} +<../examples/simple_secure_chat/main.cpp>
+lib_deps =
+  ${Heltec_lora32_v2.lib_deps}
+  adafruit/RTClib @ ^2.1.3
+  densaugeo/base64 @ ~1.4.0
 
 ; ================
 [Heltec_lora32_v3]

src/helpers/CustomSX1276.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <RadioLib.h>
+
+#define RH_RF95_MODEM_STATUS_CLEAR               0x10
+#define RH_RF95_MODEM_STATUS_HEADER_INFO_VALID   0x08
+#define RH_RF95_MODEM_STATUS_RX_ONGOING          0x04
+#define RH_RF95_MODEM_STATUS_SIGNAL_SYNCHRONIZED 0x02
+#define RH_RF95_MODEM_STATUS_SIGNAL_DETECTED     0x01
+
+class CustomSX1276 : public SX1276 {
+  public:
+    CustomSX1276(Module *mod) : SX1276(mod) { }
+
+    bool isReceiving() {
+      return (getModemStatus() &
+         (RH_RF95_MODEM_STATUS_SIGNAL_DETECTED 
+        | RH_RF95_MODEM_STATUS_SIGNAL_SYNCHRONIZED 
+        | RH_RF95_MODEM_STATUS_HEADER_INFO_VALID)) != 0;
+    }
+
+    int tryScanChannel() {
+      // start CAD
+      int16_t state = startChannelScan();
+      RADIOLIB_ASSERT(state);
+ 
+      // wait for channel activity detected or timeout
+      unsigned long timeout = millis() + 16;
+      while(!this->mod->hal->digitalRead(this->mod->getIrq()) && millis() < timeout) {
+        this->mod->hal->yield();
+        if(this->mod->hal->digitalRead(this->mod->getGpio())) {
+          return(RADIOLIB_PREAMBLE_DETECTED);
+        }
+      }
+      return 0; // timed out
+    }
+};

src/helpers/CustomSX1276Wrapper.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "CustomSX1276.h"
+#include "RadioLibWrappers.h"
+
+class CustomSX1276Wrapper : public RadioLibWrapper {
+public:
+  CustomSX1276Wrapper(CustomSX1276& radio, mesh::MainBoard& board) : RadioLibWrapper(radio, board) { }
+  bool isReceiving() override { 
+    if (((CustomSX1276 *)_radio)->isReceiving()) return true;
+
+    idle();  // put into standby
+    // do some basic CAD (blocks for ~12780 micros (on SF 10)!)
+    bool activity = (((CustomSX1276 *)_radio)->tryScanChannel() == RADIOLIB_PREAMBLE_DETECTED);
+    idle();
+
+    return activity;
+  }
+  float getLastRSSI() const override { return ((CustomSX1276 *)_radio)->getRSSI(); }
+  float getLastSNR() const override { return ((CustomSX1276 *)_radio)->getSNR(); }
+
+  float packetScore(float snr, int packet_len) override {
+    int sf = ((CustomSX1276 *)_radio)->spreadingFactor;
+    return packetScoreInt(snr, sf, packet_len);
+  }
+};

src/helpers/HeltecV2Board.h

@@ -0,0 +1,77 @@
+#pragma once
+
+#include <Arduino.h>
+
+// LoRa radio module pins for Heltec V2
+#define  P_LORA_DIO_1   26    // DIO0
+#define  P_LORA_NSS     18
+#define  P_LORA_RESET   RADIOLIB_NC  // 14
+#define  P_LORA_BUSY    RADIOLIB_NC
+#define  P_LORA_SCLK     5
+#define  P_LORA_MISO    19
+#define  P_LORA_MOSI    27
+
+// built-ins
+#define  PIN_VBAT_READ   37
+#define  PIN_LED_BUILTIN 25
+
+#include "ESP32Board.h"
+
+#include <driver/rtc_io.h>
+
+class HeltecV2Board : public ESP32Board {
+public:
+  void begin() {
+    ESP32Board::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!
+  }
+
+  uint16_t getBattMilliVolts() override {
+    analogReadResolution(10);
+
+    uint32_t raw = 0;
+    for (int i = 0; i < 8; i++) {
+      raw += analogRead(PIN_VBAT_READ);
+    }
+    raw = raw / 8;
+
+    return (1.883 * (2 * 3.3 / 1024.0) * raw) * 1000;
+  }
+
+  const char* getManufacturerName() const override {
+    return "Heltec V2";
+  }
+};