Add my_led

apps/my_led/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20.0)
+
+# Locate the Zephyr build system as a CMake package
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+
+# Project name
+project(my_led)
+
+# Add source files belong to this application
+target_sources(app PRIVATE src/main.c)

apps/my_led/boards/black_f407ve.overlay

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+/ {
+	custom_led0: custom_led0 {
+		compatible = "custom-led";
+		custom-gpios = <&gpioe 13 GPIO_ACTIVE_HIGH>;
+		my-delay-ms = <1000>; /* Optional, equals 500 by default */
+	};
+	aliases {
+		myled = &custom_led0;
+	};
+};
+
+&clk_hse {
+	clock-frequency = <DT_FREQ_M(25)>;
+};
+
+&pll {
+	div-m = <25>;
+	mul-n = <336>;
+	div-p = <2>;
+	div-q = <7>;
+};

apps/my_led/dts/bindings/custom-led.yaml

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+compatible: custom-led
+
+description: Example custom node describing a single LED GPIO and a blink delay.
+
+properties:
+  custom-gpios:
+    type: phandle-array
+    required: true
+    description: My LED GPIO.
+  my-delay-ms:
+    type: int
+    required: false
+    default: 500
+    description: Blink delay in milliseconds.

apps/my_led/prj.conf

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+CONFIG_GPIO=y
+CONFIG_SERIAL=y
+CONFIG_ADC=y
+CONFIG_UART_INTERRUPT_DRIVEN=y
+CONFIG_CONSOLE=y
+CONFIG_PRINTK=y

apps/my_led/src/main.c

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+#include <zephyr/kernel.h>
+#include <zephyr/drivers/gpio.h>
+
+#define LED_NODE DT_ALIAS(myled)
+
+#define BLINK_DELAY_MS DT_PROP(LED_NODE, my_delay_ms)
+
+const struct gpio_dt_spec led = 
+	GPIO_DT_SPEC_GET(LED_NODE, custom_gpios);
+
+int main(void) {
+
+	int ret;
+
+	if (!device_is_ready(led.port)) {
+		printk("LED GPIO device not ready\n");
+		return 0;
+	}
+
+	ret = gpio_pin_configure_dt(&led, GPIO_OUTPUT_INACTIVE);
+	if (ret != 0) {
+		printk("Failed to configure LED: %d\n", ret);
+		return 0;
+	}
+
+	printk("Blinking with delay %d ms\n", BLINK_DELAY_MS);
+	
+	while (1) {
+		gpio_pin_toggle_dt(&led);
+		k_sleep(K_MSEC(BLINK_DELAY_MS));
+	}
+
+	return 0;
+	
+}