M4: Handle poweroff

variants/thinknode_m4/ThinkNodeM4Board.h

@@ -47,6 +47,16 @@ public:
     // shutdown common peripherals
     NRF52Board::shutdownPeripherals();
 
+    #ifdef LED_STATUS
+    digitalWrite(LED_STATUS, HIGH);
+    #endif
+    #ifdef BUTTON_PIN
+    while(!digitalRead(BUTTON_PIN));
+    #endif
+    #ifdef LED_STATUS
+    digitalWrite(LED_STATUS, LOW);
+    #endif
+
     digitalWrite(LED_BAT1, LOW);
     digitalWrite(LED_BAT2, LOW);
     digitalWrite(LED_BAT3, LOW);
@@ -57,5 +67,9 @@ public:
     digitalWrite(PIN_PWR_EN, LOW);
     digitalWrite(I2C_POWER, !I2C_POWER_ACTIVE);
     digitalWrite(PIN_GPS_POWER, !GPS_POWER_ACTIVE);
+
+    #ifdef BUTTON_PIN
+    nrf_gpio_cfg_sense_input(BUTTON_PIN, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_SENSE_LOW);
+    #endif
   }
 };

variants/thinknode_m4/platformio.ini

@@ -9,7 +9,7 @@ build_flags = ${nrf52_base.build_flags}
   -I variants/thinknode_m4
   -I src/helpers/ui
   -D THINKNODE_M4
-  -D PIN_USER_BTN=12
+  -D PIN_USER_BTN=4
   -D PIN_STATUS_LED=LED_STATUS
   -D RADIO_CLASS=CustomLR1110
   -D WRAPPER_CLASS=CustomLR1110Wrapper

variants/thinknode_m4/variant.h

@@ -88,7 +88,7 @@
 
 #define PIN_BUTTON1             (4)
 #define BUTTON_PIN              PIN_BUTTON1
-#define USER_BTN_PRESSED        HIGH
+#define USER_BTN_PRESSED        LOW
 
 ////////////////////////////////////////////////////////////////////////////////
 // GPS