.gitignore

@@ -1,4 +1,3 @@
 .vscode/
 build/
 drone/
-.cache/

app/src/main.cc

@@ -5,13 +5,11 @@
  */
 
 #include <stdio.h>
-
-#include <zephyr/drivers/display.h>
-#include <zephyr/drivers/gpio.h>
 #include <zephyr/kernel.h>
+#include <zephyr/drivers/gpio.h>
 
 /* 1000 msec = 1 sec */
-#define SLEEP_TIME_MS 1000
+#define SLEEP_TIME_MS   1000
 
 /* The devicetree node identifier for the "led0" alias. */
 #define LED0_NODE DT_ALIAS(led0)
@@ -20,27 +18,13 @@
  * A build error on this line means your board is unsupported.
  * See the sample documentation for information on how to fix this.
  */
-// static const struct gpio_dt_spec led = GPIO_DT_SPEC_GET(LED0_NODE, gpios);
+static const struct gpio_dt_spec led = GPIO_DT_SPEC_GET(LED0_NODE, gpios);
 
 int main(void)
 {
 	int ret;
 	bool led_state = true;
 
-	const struct device *display =
-		DEVICE_DT_GET(DT_CHOSEN(zephyr_display));
-
-	display_capabilities capabilities;
-	display_get_capabilities(display, &capabilities);
-
-	uint32_t buf = 0;
-	display_buffer_descriptor buf_desc = {
-		.buf_size = 4, .width = 8, .height = 1, .pitch = 8};
-
-	display_write(display, 0, 0, &buf_desc, &buf);
-	int x = 0;
-
-#if 0
 	if (!gpio_is_ready_dt(&led)) {
 		return 0;
 	}
@@ -49,25 +33,16 @@ int main(void)
 	if (ret < 0) {
 		return 0;
 	}
-#endif
+
 	while (1) {
-#if 0
 		ret = gpio_pin_toggle_dt(&led);
 		if (ret < 0) {
 			return 0;
 		}
-#endif
-		for (int x = 0; x < 128; ++x) {
-			for (int y = 0; y < 64; y += 8) {
-				display_write(display, x, y, &buf_desc, &buf);
-			}
-		}
-		buf = ~buf;
 
 		led_state = !led_state;
-		printf("XLED state: %s\n", led_state ? "ON" : "OFF");
-		//		display_write(display, x, x, &buf_desc, &buf);
-		// k_msleep(SLEEP_TIME_MS);
+		printf("LED state: %s\n", led_state ? "ON" : "OFF");
+		k_msleep(SLEEP_TIME_MS);
 	}
 	return 0;
 }

boards/luftchen/luftchen.dts

@@ -11,7 +11,19 @@
 		zephyr,sram = &sram0;
 		zephyr,flash = &flash0;
 		zephyr,console = &debug0;
-		zephyr,display = &hs96l03;
+		zephyr,shell-uart = &usart1;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		red_led: led0 {
+			gpios = <&gpioa 2 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	aliases {
+		led0 = &red_led;
 	};
 };
 
@@ -19,21 +31,23 @@
 	status = "okay";
 };
 
-&i2c1 {
+&gpioa {
 	status = "okay";
-	clock-frequency = <400000>;
+};
 
-	hs96l03: hs96l03@3c {
-		compatible = "hs99l03", "solomon,ssd1306fb";
-		reg = <0x3c>;
-		width = <128>;
-		height = <64>;
-		segment-offset = <0>;
-		page-offset = <0>;
-		display-offset = <0>;
-		multiplex-ratio = <63>;
-		segment-remap;
-		com-invdir;
-		prechargep = <0x22>;
+&pinctrl {
+	usart1_default: usart1_default {
+		group0 {
+			pinmux = <USART1_TX_PD5_0>, <USART1_RX_PD6_0>;
+			bias-pull-up;
+			drive-push-pull;
+		};
 	};
 };
+
+&usart1 {
+	status = "okay";
+	current-speed = <115200>;
+	pinctrl-0 = <&usart1_default>;
+	pinctrl-names = "default";
+};

boards/luftchen/luftchen_defconfig

@@ -3,9 +3,5 @@ CONFIG_SOC_WCH_CH32V00X_PLL=y
 CONFIG_SOC_WCH_CH32V00X_HSI_AS_PLLSRC=y
 CONFIG_SOC_WCH_CH32V00X_PLL_AS_SYSCLK=y
 
-CONFIG_I2C=y
 CONFIG_CLOCK_CONTROL=y
 CONFIG_PINCTRL=y
-
-CONFIG_DISPLAY=y
-CONFIG_SSD1306=y