Added IR Lib, samples and specification

firmware/boards/nrf52840dk/nrf52840dk_nrf52840.overlay

@@ -0,0 +1,56 @@
+/*
+ * Device Tree Overlay für nRF52840 DK
+ * Definiert GPIO-Pins für Trigger, LEDs und IR-Transmission (PWM3 @ P0.16)
+ */
+
+/ {
+	aliases {
+		trigger-btn = &button0;
+		ir-output = &ir_tx0;
+		led-status = &led0;
+		led-power = &led1;
+	};
+
+	buttons {
+		compatible = "gpio-keys";
+		button0: button_0 {
+			gpios = <&gpio0 11 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+			label = "Trigger Button";
+		};
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		led0: led_0 {
+			gpios = <&gpio0 13 GPIO_ACTIVE_HIGH>;
+			label = "Status LED";
+		};
+		led1: led_1 {
+			gpios = <&gpio0 14 GPIO_ACTIVE_HIGH>;
+			label = "Power LED";
+		};
+	};
+
+	ir_pwm: ir_pwm {
+		compatible = "pwm-leds";
+		ir_tx0: ir_tx_0 {
+			pwms = <&pwm3 0 PWM_NSEC(26316) PWM_POLARITY_NORMAL>;
+			label = "IR TX PWM";
+		};
+	};
+};
+
+&pwm3 {
+	status = "okay";
+	pinctrl-0 = <&pwm3_default>;
+	pinctrl-names = "default";
+};
+
+&pinctrl {
+	pwm3_default: pwm3_default {
+		group1 {
+			psels = <NRF_PSEL(PWM_OUT0, 0, 16)>;
+		};
+	};
+};
+