testing

.gitignore

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+build/

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20.0)
+
+set(BOARD nucleo_g474re)
+find_package(Zephyr REQUIRED)
+project(app)
+
+target_sources(app PRIVATE src/main.c)

Kconfig

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+# SPDX-License-Identifier: Apache-2.0
+
+mainmenu "First App"
+
+# Your application configuration options go here
+
+# Sources Kconfig.zephyr in the Zephyr root directory.
+#
+# Note: All 'source' statements work relative to the Zephyr root directory (due
+# to the $srctree environment variable being set to $ZEPHYR_BASE). If you want
+# to 'source' relative to the current Kconfig file instead, use 'rsource' (or a
+# path relative to the Zephyr root).
+
+source "Kconfig.zephyr"

boards/nucleo_g474re.overlay

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+/ {
+  aliases {
+    /* alias used by DT_ALIAS(led0) in app code */
+    led0 = &ld2;
+  };
+
+  /* simple gpio-leds node */
+  leds {
+    compatible = "gpio-leds";
+    ld2: led_0 {
+      gpios = <&gpioa 5 GPIO_ACTIVE_HIGH>; /* LD2 -> PA5 */
+      label = "LD2";
+    };
+  };
+};
+
+&gpioa {
+  status = "okay";
+};
+
+&gpioc {
+  status = "okay";
+};

prj.conf

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+# enable gpio driver
+CONFIG_GPIO=y
+CONFIG_SERIAL=y
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+CONFIG_PRINTK=y
+CONFIG_UART_INTERRUPT_DRIVEN=y

src/main.c

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+#include <zephyr/devicetree.h>
+#include <zephyr/drivers/gpio.h>
+#include <zephyr/kernel.h>
+#include <zephyr/drivers/uart.h>
+
+#define SLEEP_MS 2000
+
+#define LED_NODE DT_ALIAS(led0)
+#if !DT_NODE_HAS_STATUS(LED_NODE, okay)
+#error "led0 not enabled in devicetree"
+#endif
+
+static const struct gpio_dt_spec led = GPIO_DT_SPEC_GET(LED_NODE, gpios);
+
+int main(void)
+{
+  printk("app started\n");
+
+  if (!gpio_is_ready_dt(&led))
+  {
+    printk("LED GPIO not ready\n");
+    return 0;
+  }
+
+  int ret = gpio_pin_configure_dt(&led, GPIO_OUTPUT_ACTIVE);
+  if (ret < 0)
+  {
+    printk("LED GPIO configure failed: %d\n", ret);
+    return 0;
+  }
+
+  char incoming;
+  int i = 0;
+  while (1)
+  {
+  }
+}