Add 01_blinky_button

apps/01_blinky_button/CMakeLists.txt

@@ -0,0 +1,10 @@
+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(blinky_button)
+
+# Add source files belong to this application
+target_sources(app PRIVATE src/main.c)

apps/01_blinky_button/boards/nucleo_f767zi.overlay

@@ -0,0 +1,18 @@
+/ {
+    aliases {
+        led0 = &red_led;
+        led1 = &blue_led;
+        led2 = &green_led;
+		sw0 = &user_button0;
+    };
+	
+	gpio_keys {
+		compatible = "gpio-keys";
+		
+		user_button0: button {
+			label = "Button";
+			gpios = <&gpioc 13 GPIO_ACTIVE_HIGH>;
+			zephyr,code = <INPUT_KEY_0>;
+		};
+	};
+};

apps/01_blinky_button/boards/stm32f4_disco.overlay

@@ -0,0 +1,9 @@
+/ {
+    aliases {
+        led0 = &red_led_5;
+        led1 = &blue_led_6;
+        led2 = &green_led_4;
+        led3 = &orange_led_3;
+		sw0 = &user_button;
+    };
+};

apps/01_blinky_button/prj.conf

@@ -0,0 +1 @@
+CONFIG_GPIO=y

apps/01_blinky_button/src/main.c

@@ -0,0 +1,102 @@
+#include <stdio.h>
+
+// Include core zephyr kernel facilities e.g. k_sleep()
+#include <zephyr/kernel.h>
+
+// Inlcude Zephyr's device model types and helpers
+#include <zephyr/device.h>
+
+// Access the C macros for reading information from the devicetree at build time
+#include <zephyr/devicetree.h>
+
+// Include GPIO driver API and the typed GPIO helpers required
+#include <zephyr/drivers/gpio.h>
+
+
+#if !DT_NODE_HAS_STATUS(DT_ALIAS(led0), okay)
+#error "Board does not define alias led0. Add a board overlay"
+#endif
+
+#if !DT_NODE_HAS_STATUS(DT_ALIAS(sw0), okay)
+#error "Board does not define alias sw0. Add a board overlay"
+#endif
+
+#if DT_HAS_ALIAS(led0)
+static const struct gpio_dt_spec led_red =
+    GPIO_DT_SPEC_GET(DT_ALIAS(led0), gpios);
+#endif
+
+#if DT_HAS_ALIAS(led1)
+static const struct gpio_dt_spec led_blue =
+    GPIO_DT_SPEC_GET(DT_ALIAS(led1), gpios);
+#endif
+
+#if DT_HAS_ALIAS(led2)
+static const struct gpio_dt_spec led_green =
+    GPIO_DT_SPEC_GET(DT_ALIAS(led2), gpios);
+#endif
+
+#if DT_HAS_ALIAS(sw0)
+static const struct gpio_dt_spec button =
+    GPIO_DT_SPEC_GET(DT_ALIAS(sw0), gpios);
+#endif    
+
+
+int main(void) {
+
+	bool led_state = true;
+
+// Make sure the GPIO is ready
+#if DT_HAS_ALIAS(led0)
+    if (!gpio_is_ready_dt(&led_red)) {
+        return 0;
+    }
+    gpio_pin_configure_dt(&led_red, GPIO_OUTPUT_ACTIVE);
+#endif
+
+#if DT_HAS_ALIAS(led1)
+    if (!gpio_is_ready_dt(&led_blue)) {
+        return 0;
+    }
+    gpio_pin_configure_dt(&led_blue, GPIO_OUTPUT_ACTIVE);
+#endif
+
+#if DT_HAS_ALIAS(led2)
+    if (!gpio_is_ready_dt(&led_green)) {
+        return 0;
+    }
+    gpio_pin_configure_dt(&led_green, GPIO_OUTPUT_INACTIVE);
+#endif
+
+#if DT_HAS_ALIAS(sw0)
+    if (!gpio_is_ready_dt(&button)) {
+        return 0;
+    }
+    gpio_pin_configure_dt(&button, GPIO_INPUT);
+#endif    
+
+	while (1) {
+
+	#if DT_HAS_ALIAS(led0)
+	    gpio_pin_toggle_dt(&led_red);
+	    // gpio_pin_set_dt(&led_red, led_state);
+	#endif
+
+	#if DT_HAS_ALIAS(led1)
+	    gpio_pin_toggle_dt(&led_blue);
+	    // gpio_pin_set_dt(&led_blue, led_state);
+	#endif
+
+	    uint8_t button_status = gpio_pin_get_dt(&button);
+	    gpio_pin_set_dt(&led_green, button_status);
+
+		led_state = !led_state;
+		printf("LED state: %s\n", led_state ? "ON" : "OFF");
+
+		k_msleep(500);
+
+	}
+
+	return 0;
+
+}