feat: initial support for Heltec Wireless Paper v1.0

E-ink panel is DEPG0213BNS800. Otherwise, identical to v1.1 (?)
Partial refresh supported, but not implemented in this commit.

src/graphics/EInkDisplay2.cpp

@@ -7,7 +7,7 @@
 #include "main.h"
 #include <SPI.h>
 
-#ifdef HELTEC_WIRELESS_PAPER
+#if defined(HELTEC_WIRELESS_PAPER) || defined(HELTEC_WIRELESS_PAPER_V1_0)
 SPIClass *hspi = NULL;
 #endif
 
@@ -48,6 +48,11 @@ SPIClass *hspi = NULL;
 #elif defined(HELTEC_WIRELESS_PAPER)
 // #define TECHO_DISPLAY_MODEL GxEPD2_213_T5D
 #define TECHO_DISPLAY_MODEL GxEPD2_213_FC1
+
+#elif defined(HELTEC_WIRELESS_PAPER_V1_0)
+// 2.13" 122x250 - DEPG0213BNS800
+#define TECHO_DISPLAY_MODEL GxEPD2_213_BN
+
 #endif
 
 GxEPD2_BW<TECHO_DISPLAY_MODEL, TECHO_DISPLAY_MODEL::HEIGHT> *adafruitDisplay;
@@ -70,6 +75,17 @@ EInkDisplay::EInkDisplay(uint8_t address, int sda, int scl, OLEDDISPLAY_GEOMETRY
     // GxEPD2_154_M09
     // setGeometry(GEOMETRY_RAWMODE, 200, 200);
 
+#elif defined(HELTEC_WIRELESS_PAPER_V1_0)
+
+    // The display's memory is actually 128px x 250px
+    // Setting the buffersize manually prevents 122/8 truncating to a 15 byte width
+    // (Or something like that..)
+
+    this->geometry = GEOMETRY_RAWMODE;
+    this->displayWidth = 250;
+    this->displayHeight = 122;
+    this->displayBufferSize = 250 * (128 / 8);
+
 #elif defined(HELTEC_WIRELESS_PAPER)
     // GxEPD2_213_BN - 2.13 inch b/w 250x122
     setGeometry(GEOMETRY_RAWMODE, 250, 122);
@@ -146,6 +162,8 @@ bool EInkDisplay::forceDisplay(uint32_t msecLimit)
 
 #elif defined(PCA10059) || defined(M5_COREINK)
         adafruitDisplay->nextPage();
+#elif defined(HELTEC_WIRELESS_PAPER_V1_0)
+        adafruitDisplay->nextPage();
 #elif defined(HELTEC_WIRELESS_PAPER)
         adafruitDisplay->nextPage();
 #elif defined(PRIVATE_HW) || defined(my)
@@ -229,6 +247,43 @@ bool EInkDisplay::connect()
             (void)adafruitDisplay;
         }
     }
+
+#elif defined(HELTEC_WIRELESS_PAPER_V1_0)
+    {
+        // Is this a normal boot, or a wake from deep sleep?
+        esp_sleep_wakeup_cause_t wakeReason = esp_sleep_get_wakeup_cause();
+
+        // If waking from sleep, need to reverse rtc_gpio_isolate(), called in cpuDeepSleep()
+        // Otherwise, SPI won't work
+        if (wakeReason != ESP_SLEEP_WAKEUP_UNDEFINED) {
+            // HSPI + other display pins
+            rtc_gpio_hold_dis((gpio_num_t)PIN_EINK_SCLK);
+            rtc_gpio_hold_dis((gpio_num_t)PIN_EINK_DC);
+            rtc_gpio_hold_dis((gpio_num_t)PIN_EINK_RES);
+            rtc_gpio_hold_dis((gpio_num_t)PIN_EINK_BUSY);
+            rtc_gpio_hold_dis((gpio_num_t)PIN_EINK_CS);
+            rtc_gpio_hold_dis((gpio_num_t)PIN_EINK_MOSI);
+        }
+
+        // Start HSPI
+        hspi = new SPIClass(HSPI);
+        hspi->begin(PIN_EINK_SCLK, -1, PIN_EINK_MOSI, PIN_EINK_CS); // SCLK, MISO, MOSI, SS
+
+        // Enable VExt (ACTIVE LOW)
+        // Unsure if called elsewhere first?
+        delay(100);
+        pinMode(Vext, OUTPUT);
+        digitalWrite(Vext, LOW);
+        delay(100);
+
+        // Create GxEPD2 objects
+        auto lowLevel = new TECHO_DISPLAY_MODEL(PIN_EINK_CS, PIN_EINK_DC, PIN_EINK_RES, PIN_EINK_BUSY, *hspi);
+        adafruitDisplay = new GxEPD2_BW<TECHO_DISPLAY_MODEL, TECHO_DISPLAY_MODEL::HEIGHT>(*lowLevel);
+
+        // Init GxEPD2
+        adafruitDisplay->init();
+        adafruitDisplay->setRotation(3);
+    }
 #elif defined(HELTEC_WIRELESS_PAPER)
     {
         hspi = new SPIClass(HSPI);

src/graphics/EInkDisplay2.h

@@ -2,6 +2,11 @@
 
 #include <OLEDDisplay.h>
 
+#if defined(HELTEC_WIRELESS_PAPER_V1_0)
+// Re-enable SPI after deep sleep: rtc_gpio_hold_dis()
+#include "driver/rtc_io.h"
+#endif
+
 /**
  * An adapter class that allows using the GxEPD2 library as if it was an OLEDDisplay implementation.
  *

src/platform/esp32/architecture.h

@@ -107,6 +107,8 @@
 #define HW_VENDOR meshtastic_HardwareModel_HELTEC_WSL_V3
 #elif defined(HELTEC_WIRELESS_TRACKER)
 #define HW_VENDOR meshtastic_HardwareModel_HELTEC_WIRELESS_TRACKER
+#elif defined(HELTEC_WIRELESS_PAPER_V1_0)
+#define HW_VENDOR meshtastic_HardwareModel_HELTEC_WIRELESS_PAPER_V1_0
 #elif defined(HELTEC_WIRELESS_PAPER)
 #define HW_VENDOR meshtastic_HardwareModel_HELTEC_WIRELESS_PAPER
 #elif defined(TLORA_T3S3_V1)

variants/heltec_wireless_paper_v1/pins_arduino.h

@@ -0,0 +1,78 @@
+#ifndef Pins_Arduino_h
+#define Pins_Arduino_h
+
+#include <stdint.h>
+
+#define WIFI_Kit_32 true
+#define DISPLAY_HEIGHT 64
+#define DISPLAY_WIDTH 128
+
+#define EXTERNAL_NUM_INTERRUPTS 16
+#define NUM_DIGITAL_PINS 40
+#define NUM_ANALOG_INPUTS 16
+
+#define analogInputToDigitalPin(p) (((p) < 20) ? (analogChannelToDigitalPin(p)) : -1)
+#define digitalPinToInterrupt(p) (((p) < 40) ? (p) : -1)
+#define digitalPinHasPWM(p) (p < 34)
+
+static const uint8_t LED_BUILTIN = 35;
+#define BUILTIN_LED LED_BUILTIN // backward compatibility
+#define LED_BUILTIN LED_BUILTIN
+
+static const uint8_t KEY_BUILTIN = 0;
+
+static const uint8_t TX = 43;
+static const uint8_t RX = 44;
+
+static const uint8_t SDA = 41;
+static const uint8_t SCL = 42;
+
+static const uint8_t SS = 8;
+static const uint8_t MOSI = 10;
+static const uint8_t MISO = 11;
+static const uint8_t SCK = 9;
+
+static const uint8_t A0 = 1;
+static const uint8_t A1 = 2;
+static const uint8_t A2 = 3;
+static const uint8_t A3 = 4;
+static const uint8_t A4 = 5;
+static const uint8_t A5 = 6;
+static const uint8_t A6 = 7;
+static const uint8_t A7 = 8;
+static const uint8_t A8 = 9;
+static const uint8_t A9 = 10;
+static const uint8_t A10 = 11;
+static const uint8_t A11 = 12;
+static const uint8_t A12 = 13;
+static const uint8_t A13 = 14;
+static const uint8_t A14 = 15;
+static const uint8_t A15 = 16;
+static const uint8_t A16 = 17;
+static const uint8_t A17 = 18;
+static const uint8_t A18 = 19;
+static const uint8_t A19 = 20;
+
+static const uint8_t T1 = 1;
+static const uint8_t T2 = 2;
+static const uint8_t T3 = 3;
+static const uint8_t T4 = 4;
+static const uint8_t T5 = 5;
+static const uint8_t T6 = 6;
+static const uint8_t T7 = 7;
+static const uint8_t T8 = 8;
+static const uint8_t T9 = 9;
+static const uint8_t T10 = 10;
+static const uint8_t T11 = 11;
+static const uint8_t T12 = 12;
+static const uint8_t T13 = 13;
+static const uint8_t T14 = 14;
+
+static const uint8_t Vext = 45;
+static const uint8_t LED = 18;
+
+static const uint8_t RST_LoRa = 12;
+static const uint8_t BUSY_LoRa = 13;
+static const uint8_t DIO0 = 14;
+
+#endif /* Pins_Arduino_h */

variants/heltec_wireless_paper_v1/platformio.ini

@@ -0,0 +1,13 @@
+[env:heltec-wireless-paper-v1_0]
+extends = esp32s3_base
+board = heltec_wifi_lora_32_V3
+build_flags = 
+  ${esp32s3_base.build_flags} 
+  -I variants/heltec_wireless_paper_v1 
+  -D HELTEC_WIRELESS_PAPER_V1_0
+lib_deps =
+  ${esp32s3_base.lib_deps}
+  https://github.com/meshtastic/GxEPD2/
+  adafruit/Adafruit BusIO@^1.13.2
+  lewisxhe/PCF8563_Library@^1.0.1
+upload_speed = 115200

variants/heltec_wireless_paper_v1/variant.h

@@ -0,0 +1,54 @@
+#define LED_PIN 18
+
+// Enable bus for external periherals
+#define I2C_SDA SDA
+#define I2C_SCL SCL
+
+#define USE_EINK
+/*
+ * eink display pins
+ */
+#define PIN_EINK_CS 4
+#define PIN_EINK_BUSY 7
+#define PIN_EINK_DC 5
+#define PIN_EINK_RES 6
+#define PIN_EINK_SCLK 3
+#define PIN_EINK_MOSI 2
+
+/*
+ * SPI interfaces
+ */
+#define SPI_INTERFACES_COUNT 2
+
+#define PIN_SPI_MISO 10 // MISO      P0.17
+#define PIN_SPI_MOSI 11 // MOSI      P0.15
+#define PIN_SPI_SCK 9   // SCK       P0.13
+
+#define VEXT_ENABLE 45 // active low, powers the oled display and the lora antenna boost
+#define BUTTON_PIN 0
+
+#define BATTERY_PIN 1 // A battery voltage measurement pin, voltage divider connected here to measure battery voltage
+#define ADC_CHANNEL ADC1_GPIO1_CHANNEL
+#define ADC_ATTENUATION ADC_ATTEN_DB_2_5 // lower dB for high resistance voltage divider
+#define ADC_MULTIPLIER 4.9
+
+#define USE_SX1262
+
+#define LORA_DIO0 -1 // a No connect on the SX1262 module
+#define LORA_RESET 12
+#define LORA_DIO1 14 // SX1262 IRQ
+#define LORA_DIO2 13 // SX1262 BUSY
+#define LORA_DIO3    // Not connected on PCB, but internally on the TTGO SX1262, if DIO3 is high the TXCO is enabled
+
+#define LORA_SCK 9
+#define LORA_MISO 11
+#define LORA_MOSI 10
+#define LORA_CS 8
+
+#define SX126X_CS LORA_CS
+#define SX126X_DIO1 LORA_DIO1
+#define SX126X_BUSY LORA_DIO2
+#define SX126X_RESET LORA_RESET
+
+#define SX126X_DIO2_AS_RF_SWITCH
+#define SX126X_DIO3_TCXO_VOLTAGE 1.8