arduino · facchinm · Mar 6, 2025 · Feb 5, 2025 · Mar 5, 2025
diff --git a/cores/arduino/main.cpp b/cores/arduino/main.cpp
@@ -13,11 +13,20 @@
 void start_static_threads();
 #endif
 
+
+// This function will be overwriten by most variants.
+void __attribute__((weak))initVariant(void) {
+
+}
+
+
 int main(void) {
 #if (DT_NODE_HAS_PROP(DT_PATH(zephyr_user), cdc_acm) && CONFIG_USB_CDC_ACM)
   Serial.begin(115200);
 #endif
 
+  initVariant();
+
 #ifdef CONFIG_MULTITHREADING
   start_static_threads();
 #endif

diff --git a/loader/boards/arduino_nano_33_ble_sense.overlay b/loader/boards/arduino_nano_33_ble_sense.overlay
@@ -45,6 +45,8 @@
 
 / {
 	zephyr,user {
+		pin-enable-gpios = <&gpio0 22 GPIO_ACTIVE_HIGH>;
+
 		digital-pin-gpios = <&arduino_nano_header 0 0>,
 				    <&arduino_nano_header 1 0>,
 				    <&arduino_nano_header 2 0>,

diff --git a/variants/arduino_nano_33_ble_sense/variant.cpp b/variants/arduino_nano_33_ble_sense/variant.cpp
@@ -1,6 +1,23 @@
+#include "Arduino.h"
 #include <hal/nrf_power.h>
+#include <zephyr/dt-bindings/gpio/nordic-nrf-gpio.h>
 
 void _on_1200_bps() {
     nrf_power_gpregret_set(NRF_POWER, 0, 0xb0);
     NVIC_SystemReset();
-}
+}
+
+void initVariant(void) {
+  static const struct gpio_dt_spec enable_sensors =
+    GPIO_DT_SPEC_GET(DT_PATH(zephyr_user), pin_enable_gpios);
+  if (gpio_is_ready_dt(&enable_sensors)) {
+      gpio_flags_t flags = enable_sensors.dt_flags | GPIO_OUTPUT_HIGH | GPIO_ACTIVE_HIGH | NRF_GPIO_DRIVE_H0H1;
+      Serial.println((uint32_t)flags, HEX);
+
+      gpio_pin_configure(enable_sensors.port, enable_sensors.pin, flags);
+      gpio_pin_set(enable_sensors.port, enable_sensors.pin, HIGH);
+      //Serial.println("### Sensor pin enabled ###");
+
+      delay(500);
+  }
+}