Move device code from main.cpp to earlyInitVariant (#9438)

src/input/TrackballInterruptBase.cpp

@@ -61,11 +61,7 @@ int32_t TrackballInterruptBase::runOnce()
         uint32_t pressDuration = millis() - pressStartTime;
         bool buttonStillPressed = false;
 
-#if defined(T_DECK)
-        buttonStillPressed = (this->action == TB_ACTION_PRESSED);
-#else
         buttonStillPressed = !digitalRead(_pinPress);
-#endif
 
         if (!buttonStillPressed) {
             // Button released
@@ -135,7 +131,7 @@ int32_t TrackballInterruptBase::runOnce()
     }
 
 #if defined(T_DECK) // T-deck gets a super-simple debounce on trackball
-    if (this->action == TB_ACTION_PRESSED && !pressDetected) {
+    if (this->action == TB_ACTION_PRESSED && (!pressDetected || pressStartTime == 0)) {
         // Start long press detection
         pressDetected = true;
         pressStartTime = millis();

src/main.cpp

@@ -43,10 +43,6 @@
 #include "MessageStore.h"
 #endif
 
-#ifdef ELECROW_ThinkNode_M5
-PCA9557 io(0x18, &Wire);
-#endif
-
 #ifdef ARCH_ESP32
 #include "freertosinc.h"
 #if !MESHTASTIC_EXCLUDE_WEBSERVER
@@ -312,6 +308,9 @@ __attribute__((weak, noinline)) bool loopCanSleep()
 void lateInitVariant() __attribute__((weak));
 void lateInitVariant() {}
 
+void earlyInitVariant() __attribute__((weak));
+void earlyInitVariant() {}
+
 // NRF52 (and probably other platforms) can report when system is in power failure mode
 // (eg. too low battery voltage) and operating it is unsafe (data corruption, bootloops, etc).
 // For example NRF52 will prevent any flash writes in that case automatically
@@ -367,27 +366,14 @@ void setup()
     // boot sequence will follow when battery level raises to safe mode
     waitUntilPowerLevelSafe();
 
-    // TODO remove all device-specific setup code to variant.cpp
-#if defined(R1_NEO)
-    pinMode(DCDC_EN_HOLD, OUTPUT);
-    digitalWrite(DCDC_EN_HOLD, HIGH);
-    pinMode(NRF_ON, OUTPUT);
-    digitalWrite(NRF_ON, HIGH);
-#endif
+    // Defined in variant.cpp for early init code
+    earlyInitVariant();
 
 #if defined(PIN_POWER_EN)
     pinMode(PIN_POWER_EN, OUTPUT);
     digitalWrite(PIN_POWER_EN, HIGH);
 #endif
 
-#if defined(ELECROW_ThinkNode_M5)
-    Wire.begin(48, 47);
-    io.pinMode(PCA_PIN_EINK_EN, OUTPUT);
-    io.pinMode(PCA_PIN_POWER_EN, OUTPUT);
-    io.digitalWrite(PCA_PIN_POWER_EN, HIGH);
-    // io.pinMode(C2_PIN, OUTPUT);
-#endif
-
 #ifdef LED_POWER
     pinMode(LED_POWER, OUTPUT);
     digitalWrite(LED_POWER, LED_STATE_ON);
@@ -412,62 +398,6 @@ void setup()
 #endif
 #endif
 
-#if defined(T_DECK)
-    // GPIO10 manages all peripheral power supplies
-    // Turn on peripheral power immediately after MUC starts.
-    // If some boards are turned on late, ESP32 will reset due to low voltage.
-    // ESP32-C3(Keyboard) , MAX98357A(Audio Power Amplifier) ,
-    // TF Card , Display backlight(AW9364DNR) , AN48841B(Trackball) , ES7210(Decoder)
-    pinMode(KB_POWERON, OUTPUT);
-    digitalWrite(KB_POWERON, HIGH);
-    // T-Deck has all three SPI peripherals (TFT, SD, LoRa) attached to the same SPI bus
-    // We need to initialize all CS pins in advance otherwise there will be SPI communication issues
-    // e.g. when detecting the SD card
-    pinMode(LORA_CS, OUTPUT);
-    digitalWrite(LORA_CS, HIGH);
-    pinMode(SDCARD_CS, OUTPUT);
-    digitalWrite(SDCARD_CS, HIGH);
-    pinMode(TFT_CS, OUTPUT);
-    digitalWrite(TFT_CS, HIGH);
-    delay(100);
-#elif defined(T_DECK_PRO)
-    pinMode(LORA_EN, OUTPUT);
-    digitalWrite(LORA_EN, HIGH);
-    pinMode(LORA_CS, OUTPUT);
-    digitalWrite(LORA_CS, HIGH);
-    pinMode(SDCARD_CS, OUTPUT);
-    digitalWrite(SDCARD_CS, HIGH);
-    pinMode(PIN_EINK_CS, OUTPUT);
-    digitalWrite(PIN_EINK_CS, HIGH);
-#elif defined(T_LORA_PAGER)
-    pinMode(LORA_CS, OUTPUT);
-    digitalWrite(LORA_CS, HIGH);
-    pinMode(SDCARD_CS, OUTPUT);
-    digitalWrite(SDCARD_CS, HIGH);
-    pinMode(TFT_CS, OUTPUT);
-    digitalWrite(TFT_CS, HIGH);
-    pinMode(KB_INT, INPUT_PULLUP);
-    // io expander
-    io.begin(Wire, XL9555_SLAVE_ADDRESS0, SDA, SCL);
-    io.pinMode(EXPANDS_DRV_EN, OUTPUT);
-    io.digitalWrite(EXPANDS_DRV_EN, HIGH);
-    io.pinMode(EXPANDS_AMP_EN, OUTPUT);
-    io.digitalWrite(EXPANDS_AMP_EN, LOW);
-    io.pinMode(EXPANDS_LORA_EN, OUTPUT);
-    io.digitalWrite(EXPANDS_LORA_EN, HIGH);
-    io.pinMode(EXPANDS_GPS_EN, OUTPUT);
-    io.digitalWrite(EXPANDS_GPS_EN, HIGH);
-    io.pinMode(EXPANDS_KB_EN, OUTPUT);
-    io.digitalWrite(EXPANDS_KB_EN, HIGH);
-    io.pinMode(EXPANDS_SD_EN, OUTPUT);
-    io.digitalWrite(EXPANDS_SD_EN, HIGH);
-    io.pinMode(EXPANDS_GPIO_EN, OUTPUT);
-    io.digitalWrite(EXPANDS_GPIO_EN, HIGH);
-    io.pinMode(EXPANDS_SD_PULLEN, INPUT);
-#elif defined(HACKADAY_COMMUNICATOR)
-    pinMode(KB_INT, INPUT);
-#endif
-
     concurrency::hasBeenSetup = true;
 
     meshtastic_Config_DisplayConfig_OledType screen_model =

src/main.h

@@ -26,8 +26,8 @@ extern NRF52Bluetooth *nrf52Bluetooth;
 #if ARCH_PORTDUINO
 extern HardwareSPI *DisplaySPI;
 extern HardwareSPI *LoraSPI;
-
 #endif
+
 extern ScanI2C::DeviceAddress screen_found;
 extern ScanI2C::DeviceAddress cardkb_found;
 extern uint8_t kb_model;
@@ -47,16 +47,16 @@ extern bool isUSBPowered;
 extern Adafruit_DRV2605 drv;
 #endif
 
+#ifdef HAS_PCA9557
+#include <PCA9557.h>
+extern PCA9557 io;
+#endif
+
 #ifdef HAS_I2S
 #include "AudioThread.h"
 extern AudioThread *audioThread;
 #endif
 
-#ifdef ELECROW_ThinkNode_M5
-#include <PCA9557.h>
-extern PCA9557 io;
-#endif
-
 #ifdef HAS_UDP_MULTICAST
 #include "mesh/udp/UdpMulticastHandler.h"
 extern UdpMulticastHandler *udpHandler;

src/platform/extra_variants/README.md

@@ -5,7 +5,7 @@ This directory tree is designed to solve two problems.
 - The ESP32 arduino/platformio project doesn't support the nice "if initVariant() is found, call that after init" behavior of the nrf52 builds (they use initVariant() internally).
 - Over the years a lot of 'board specific' init code has been added to init() in main.cpp. It would be great to have a general/clean mechanism to allow developers to specify board specific/unique code in a clean fashion without mucking in main.
 
-So we are borrowing the initVariant() ideas here (by using weak gcc references). You can now define lateInitVariant() if your board needs it.
+So we are borrowing the initVariant() ideas here (by using weak gcc references). You can now define earlyInitVariant() and lateInitVariant() if your board needs them. earlyInitVariant() runs at the beginning of setup() directly after waitUntilPowerLevelSafe(); while lateInitVariant() runs after the LoRa radio is initialized.
 
 If you'd like a board specific variant to be run, add the variant.cpp file to an appropriately named
 subdirectory and check for \_VARIANT_boardname in the cpp file (so that your code is only built for your board).

src/platform/nrf52/main-nrf52.cpp

@@ -430,15 +430,6 @@ void cpuDeepSleep(uint32_t msecToWake)
         Serial1.end();
 #endif
 
-#ifdef TTGO_T_ECHO
-    // To power off the T-Echo, the display must be set
-    // as an input pin; otherwise, there will be leakage current.
-    pinMode(PIN_EINK_CS, INPUT);
-    pinMode(PIN_EINK_DC, INPUT);
-    pinMode(PIN_EINK_RES, INPUT);
-    pinMode(PIN_EINK_BUSY, INPUT);
-#endif
-
     setBluetoothEnable(false);
 
 #ifdef RAK4630
@@ -449,57 +440,8 @@ void cpuDeepSleep(uint32_t msecToWake)
     // RAK-12039 set pin for Air quality sensor
     digitalWrite(AQ_SET_PIN, LOW);
 #endif
-#ifdef RAK14014
-    // GPIO restores input status, otherwise there will be leakage current
-    nrf_gpio_cfg_default(TFT_BL);
-    nrf_gpio_cfg_default(TFT_DC);
-    nrf_gpio_cfg_default(TFT_CS);
-    nrf_gpio_cfg_default(TFT_SCLK);
-    nrf_gpio_cfg_default(TFT_MOSI);
-    nrf_gpio_cfg_default(TFT_MISO);
-    nrf_gpio_cfg_default(SCREEN_TOUCH_INT);
-    nrf_gpio_cfg_default(WB_I2C1_SCL);
-    nrf_gpio_cfg_default(WB_I2C1_SDA);
-
-    // nrf_gpio_cfg_default(WB_I2C2_SCL);
-    // nrf_gpio_cfg_default(WB_I2C2_SDA);
-#endif
-#endif
-#ifdef MESHLINK
-#ifdef PIN_WD_EN
-    digitalWrite(PIN_WD_EN, LOW);
-#endif
-#endif
-
-#if defined(HELTEC_MESH_NODE_T114) || defined(HELTEC_MESH_SOLAR)
-    nrf_gpio_cfg_default(PIN_GPS_PPS);
-    detachInterrupt(PIN_GPS_PPS);
-    detachInterrupt(PIN_BUTTON1);
-#endif
-
-#ifdef ELECROW_ThinkNode_M1
-    for (int pin = 0; pin < 48; pin++) {
-        if (pin == 17 || pin == 19 || pin == 20 || pin == 22 || pin == 23 || pin == 24 || pin == 25 || pin == 9 || pin == 10 ||
-            pin == PIN_BUTTON1 || pin == PIN_BUTTON2) {
-            continue;
-        }
-        pinMode(pin, OUTPUT);
-    }
-    for (int pin = 0; pin < 48; pin++) {
-        if (pin == 17 || pin == 19 || pin == 20 || pin == 22 || pin == 23 || pin == 24 || pin == 25 || pin == 9 || pin == 10 ||
-            pin == PIN_BUTTON1 || pin == PIN_BUTTON2) {
-            continue;
-        }
-        digitalWrite(pin, LOW);
-    }
-    for (int pin = 0; pin < 48; pin++) {
-        if (pin == 17 || pin == 19 || pin == 20 || pin == 22 || pin == 23 || pin == 24 || pin == 25 || pin == 9 || pin == 10 ||
-            pin == PIN_BUTTON1 || pin == PIN_BUTTON2) {
-            continue;
-        }
-        NRF_GPIO->DIRCLR = (1 << pin);
-    }
 #endif
+    // Run shutdown code if specified in variant.cpp
     variant_shutdown();
 
     // Sleepy trackers or sensors can low power "sleep"

variants/esp32s3/ELECROW-ThinkNode-M5/platformio.ini

@@ -11,6 +11,10 @@ custom_meshtastic_requires_dfu = false
 
 extends = esp32s3_base
 board = ESP32-S3-WROOM-1-N4
+build_src_filter =
+  ${esp32s3_base.build_src_filter}
+  +<../variants/esp32s3/ELECROW-ThinkNode-M5>
+
 build_flags =
   ${esp32s3_base.build_flags}
   -D ELECROW_ThinkNode_M5

variants/esp32s3/ELECROW-ThinkNode-M5/variant.cpp

@@ -0,0 +1,12 @@
+#include "variant.h"
+#include <PCA9557.h>
+
+PCA9557 io(0x18, &Wire);
+
+void earlyInitVariant()
+{
+    Wire.begin(48, 47);
+    io.pinMode(PCA_PIN_EINK_EN, OUTPUT);
+    io.pinMode(PCA_PIN_POWER_EN, OUTPUT);
+    io.digitalWrite(PCA_PIN_POWER_EN, HIGH);
+}

variants/esp32s3/ELECROW-ThinkNode-M5/variant.h

@@ -4,6 +4,8 @@
 #define UART_TX 43
 #define UART_RX 44
 
+#define HAS_PCA9557
+
 // LED
 // Both of these are on the GPIO expander
 #define PCA_LED_USER 1  // the Blue LED

variants/esp32s3/hackaday-communicator/platformio.ini

@@ -6,6 +6,10 @@ board_check = true
 board_build.partitions = default_16MB.csv
 upload_protocol = esptool
 
+build_src_filter =
+  ${esp32s3_base.build_src_filter}
+  +<../variants/esp32s3/hackaday-communicator>
+
 build_flags = ${esp32s3_base.build_flags} 
   -D HACKADAY_COMMUNICATOR
   -D BOARD_HAS_PSRAM
@@ -13,4 +17,4 @@ build_flags = ${esp32s3_base.build_flags}
 
 lib_deps = ${esp32s3_base.lib_deps}
   # renovate: datasource=git-refs depName=meshtastic-Arduino_GFX packageName=https://github.com/meshtastic/Arduino_GFX gitBranch=master
-  https://github.com/meshtastic/Arduino_GFX/archive/054e81ffaf23784830a734e3c184346789349406.zip
+  https://github.com/meshtastic/Arduino_GFX/archive/054e81ffaf23784830a734e3c184346789349406.zip

variants/esp32s3/hackaday-communicator/variant.cpp

@@ -0,0 +1,6 @@
+#include "variant.h"
+#include "Arduino.h"
+void earlyInitVariant()
+{
+    pinMode(KB_INT, INPUT);
+}

variants/esp32s3/t-deck-pro/platformio.ini

@@ -15,6 +15,10 @@ board = t-deck-pro
 board_check = true
 upload_protocol = esptool
 
+build_src_filter =
+  ${esp32s3_base.build_src_filter}
+  +<../variants/esp32s3/t-deck-pro>
+
 build_flags = 
   ${esp32s3_base.build_flags} -I variants/esp32s3/t-deck-pro
   -D T_DECK_PRO

variants/esp32s3/t-deck-pro/variant.cpp

@@ -0,0 +1,14 @@
+#include "variant.h"
+#include "Arduino.h"
+
+void earlyInitVariant()
+{
+    pinMode(LORA_EN, OUTPUT);
+    digitalWrite(LORA_EN, HIGH);
+    pinMode(LORA_CS, OUTPUT);
+    digitalWrite(LORA_CS, HIGH);
+    pinMode(SDCARD_CS, OUTPUT);
+    digitalWrite(SDCARD_CS, HIGH);
+    pinMode(PIN_EINK_CS, OUTPUT);
+    digitalWrite(PIN_EINK_CS, HIGH);
+}

variants/esp32s3/t-deck/platformio.ini

@@ -17,6 +17,10 @@ board_check = true
 board_build.partitions = default_16MB.csv
 upload_protocol = esptool
 
+build_src_filter =
+  ${esp32s3_base.build_src_filter}
+  +<../variants/esp32s3/t-deck>
+
 build_flags = ${esp32s3_base.build_flags} 
   -D T_DECK 
   -D BOARD_HAS_PSRAM

variants/esp32s3/t-deck/variant.cpp

@@ -0,0 +1,23 @@
+#include "variant.h"
+#include "Arduino.h"
+
+void earlyInitVariant()
+{
+    // GPIO10 manages all peripheral power supplies
+    // Turn on peripheral power immediately after MUC starts.
+    // If some boards are turned on late, ESP32 will reset due to low voltage.
+    // ESP32-C3(Keyboard) , MAX98357A(Audio Power Amplifier) ,
+    // TF Card , Display backlight(AW9364DNR) , AN48841B(Trackball) , ES7210(Decoder)
+    pinMode(KB_POWERON, OUTPUT);
+    digitalWrite(KB_POWERON, HIGH);
+    // T-Deck has all three SPI peripherals (TFT, SD, LoRa) attached to the same SPI bus
+    // We need to initialize all CS pins in advance otherwise there will be SPI communication issues
+    // e.g. when detecting the SD card
+    pinMode(LORA_CS, OUTPUT);
+    digitalWrite(LORA_CS, HIGH);
+    pinMode(SDCARD_CS, OUTPUT);
+    digitalWrite(SDCARD_CS, HIGH);
+    pinMode(TFT_CS, OUTPUT);
+    digitalWrite(TFT_CS, HIGH);
+    delay(100);
+}

variants/esp32s3/tlora-pager/platformio.ini

@@ -17,6 +17,10 @@ board_check = true
 board_build.partitions = default_16MB.csv
 upload_protocol = esptool
 
+build_src_filter =
+  ${esp32s3_base.build_src_filter}
+  +<../variants/esp32s3/tlora-pager>
+
 build_flags = ${esp32s3_base.build_flags} 
   -I variants/esp32s3/tlora-pager
   -D T_LORA_PAGER 

variants/esp32s3/tlora-pager/variant.cpp

@@ -0,0 +1,31 @@
+#include "variant.h"
+#include "ExtensionIOXL9555.hpp"
+extern ExtensionIOXL9555 io;
+
+void earlyInitVariant()
+{
+    pinMode(LORA_CS, OUTPUT);
+    digitalWrite(LORA_CS, HIGH);
+    pinMode(SDCARD_CS, OUTPUT);
+    digitalWrite(SDCARD_CS, HIGH);
+    pinMode(TFT_CS, OUTPUT);
+    digitalWrite(TFT_CS, HIGH);
+    pinMode(KB_INT, INPUT_PULLUP);
+    // io expander
+    io.begin(Wire, XL9555_SLAVE_ADDRESS0, SDA, SCL);
+    io.pinMode(EXPANDS_DRV_EN, OUTPUT);
+    io.digitalWrite(EXPANDS_DRV_EN, HIGH);
+    io.pinMode(EXPANDS_AMP_EN, OUTPUT);
+    io.digitalWrite(EXPANDS_AMP_EN, LOW);
+    io.pinMode(EXPANDS_LORA_EN, OUTPUT);
+    io.digitalWrite(EXPANDS_LORA_EN, HIGH);
+    io.pinMode(EXPANDS_GPS_EN, OUTPUT);
+    io.digitalWrite(EXPANDS_GPS_EN, HIGH);
+    io.pinMode(EXPANDS_KB_EN, OUTPUT);
+    io.digitalWrite(EXPANDS_KB_EN, HIGH);
+    io.pinMode(EXPANDS_SD_EN, OUTPUT);
+    io.digitalWrite(EXPANDS_SD_EN, HIGH);
+    io.pinMode(EXPANDS_GPIO_EN, OUTPUT);
+    io.digitalWrite(EXPANDS_GPIO_EN, HIGH);
+    io.pinMode(EXPANDS_SD_PULLEN, INPUT);
+}

variants/nrf52840/ELECROW-ThinkNode-M1/variant.cpp

@@ -42,3 +42,21 @@ void initVariant()
     pinMode(PIN_LED3, OUTPUT);
     ledOff(PIN_LED3);
 }
+
+void variant_shutdown()
+{
+    for (int pin = 0; pin < 48; pin++) {
+        if (pin == SX126X_BUSY || pin == PIN_SPI_SCK || pin == SX126X_DIO1 || pin == PIN_SPI_MOSI || pin == PIN_SPI_MISO ||
+            pin == SX126X_CS || pin == SX126X_RESET || pin == PIN_NFC1 || pin == PIN_NFC2 || pin == PIN_BUTTON1 ||
+            pin == PIN_BUTTON2) {
+            continue;
+        }
+        pinMode(pin, OUTPUT);
+        digitalWrite(pin, LOW);
+        if (pin >= 32) {
+            NRF_P1->DIRCLR = (1 << (pin - 32));
+        } else {
+            NRF_GPIO->DIRCLR = (1 << pin);
+        }
+    }
+}

variants/nrf52840/heltec_mesh_node_t114-inkhud/variant.cpp

@@ -19,6 +19,7 @@
 */
 
 #include "variant.h"
+#include "Arduino.h"
 #include "nrf.h"
 #include "wiring_constants.h"
 #include "wiring_digital.h"
@@ -36,3 +37,10 @@ void initVariant()
     pinMode(PIN_LED1, OUTPUT);
     ledOff(PIN_LED1);
 }
+
+void variant_shutdown()
+{
+    nrf_gpio_cfg_default(PIN_GPS_PPS);
+    detachInterrupt(PIN_GPS_PPS);
+    detachInterrupt(PIN_BUTTON1);
+}

variants/nrf52840/heltec_mesh_node_t114/variant.cpp

@@ -19,6 +19,7 @@
 */
 
 #include "variant.h"
+#include "Arduino.h"
 #include "nrf.h"
 #include "wiring_constants.h"
 #include "wiring_digital.h"
@@ -36,3 +37,10 @@ void initVariant()
     pinMode(PIN_LED1, OUTPUT);
     ledOff(PIN_LED1);
 }
+
+void variant_shutdown()
+{
+    nrf_gpio_cfg_default(PIN_GPS_PPS);
+    detachInterrupt(PIN_GPS_PPS);
+    detachInterrupt(PIN_BUTTON1);
+}

variants/nrf52840/heltec_mesh_node_t114/variant.h

@@ -156,7 +156,7 @@ No longer populated on PCB
 
 // The bluetooth transmit power on the nRF52840 is adjustable from -20dB to +8dB in steps of 4dB
 // so NRF52_BLE_TX_POWER can be set to -20, -16, -12, -8, -4, 0 (default), 4, and 8.
-//#define NRF52_BLE_TX_POWER 8
+// #define NRF52_BLE_TX_POWER 8
 
 /*
  * GPS pins

variants/nrf52840/heltec_mesh_solar/variant.cpp

@@ -19,6 +19,7 @@
 */
 
 #include "variant.h"
+#include "Arduino.h"
 #include "nrf.h"
 #include "wiring_constants.h"
 #include "wiring_digital.h"
@@ -38,3 +39,10 @@ void initVariant()
     digitalWrite(PIN_SCREEN_VDD_CTL, LOW); // Start with power on
 #endif
 }
+
+void variant_shutdown()
+{
+    nrf_gpio_cfg_default(PIN_GPS_PPS);
+    detachInterrupt(PIN_GPS_PPS);
+    detachInterrupt(PIN_BUTTON1);
+}

variants/nrf52840/meshlink/variant.cpp

@@ -20,4 +20,11 @@ void initVariant()
     pinMode(PIN_WD_EN, OUTPUT);
     digitalWrite(PIN_WD_EN, HIGH); // Enable the Watchdog at boot
 #endif
+}
+
+void variant_shutdown()
+{
+#ifdef PIN_WD_EN
+    digitalWrite(PIN_WD_EN, LOW);
+#endif
 }

variants/nrf52840/r1-neo/variant.cpp

@@ -43,3 +43,11 @@ void initVariant()
     // pinMode(PIN_3V3_EN, OUTPUT);
     // digitalWrite(PIN_3V3_EN, HIGH);
 }
+
+void earlyInitVariant()
+{
+    pinMode(DCDC_EN_HOLD, OUTPUT);
+    digitalWrite(DCDC_EN_HOLD, HIGH);
+    pinMode(NRF_ON, OUTPUT);
+    digitalWrite(NRF_ON, HIGH);
+}

variants/nrf52840/rak_wismeshtap/variant.cpp

@@ -42,4 +42,21 @@ void initVariant()
     // 3V3 Power Rail
     pinMode(PIN_3V3_EN, OUTPUT);
     digitalWrite(PIN_3V3_EN, HIGH);
+}
+
+void variant_shutdown()
+{
+    // GPIO restores input status, otherwise there will be leakage current
+    nrf_gpio_cfg_default(TFT_BL);
+    nrf_gpio_cfg_default(TFT_DC);
+    nrf_gpio_cfg_default(TFT_CS);
+    nrf_gpio_cfg_default(TFT_SCLK);
+    nrf_gpio_cfg_default(TFT_MOSI);
+    nrf_gpio_cfg_default(TFT_MISO);
+    nrf_gpio_cfg_default(SCREEN_TOUCH_INT);
+    nrf_gpio_cfg_default(WB_I2C1_SCL);
+    nrf_gpio_cfg_default(WB_I2C1_SDA);
+
+    // nrf_gpio_cfg_default(WB_I2C2_SCL);
+    // nrf_gpio_cfg_default(WB_I2C2_SDA);
 }

variants/nrf52840/t-echo/variant.cpp

@@ -42,3 +42,13 @@ void initVariant()
     pinMode(PIN_LED3, OUTPUT);
     ledOff(PIN_LED3);
 }
+
+void variant_shutdown()
+{
+    // To power off the T-Echo, the display must be set
+    // as an input pin; otherwise, there will be leakage current.
+    pinMode(PIN_EINK_CS, INPUT);
+    pinMode(PIN_EINK_DC, INPUT);
+    pinMode(PIN_EINK_RES, INPUT);
+    pinMode(PIN_EINK_BUSY, INPUT);
+}