luftchen: experiment with the display

.gitignore

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

app/src/main.cc

@@ -5,11 +5,13 @@
  */
 
 #include <stdio.h>
-#include <zephyr/kernel.h>
+
+#include <zephyr/drivers/display.h>
 #include <zephyr/drivers/gpio.h>
+#include <zephyr/kernel.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)
@@ -18,13 +20,27 @@
  * 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;
 	}
@@ -33,16 +49,25 @@ 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("LED state: %s\n", led_state ? "ON" : "OFF");
-		k_msleep(SLEEP_TIME_MS);
+		printf("XLED state: %s\n", led_state ? "ON" : "OFF");
+		//		display_write(display, x, x, &buf_desc, &buf);
+		// k_msleep(SLEEP_TIME_MS);
 	}
 	return 0;
 }

boards/luftchen/luftchen.dts

@@ -11,19 +11,7 @@
 		zephyr,sram = &sram0;
 		zephyr,flash = &flash0;
 		zephyr,console = &debug0;
-		zephyr,shell-uart = &usart1;
-	};
-
-	leds {
-		compatible = "gpio-leds";
-
-		red_led: led0 {
-			gpios = <&gpioa 2 GPIO_ACTIVE_HIGH>;
-		};
-	};
-
-	aliases {
-		led0 = &red_led;
+		zephyr,display = &hs96l03;
 	};
 };
 
@@ -31,23 +19,21 @@
 	status = "okay";
 };
 
-&gpioa {
+&i2c1 {
 	status = "okay";
-};
+	clock-frequency = <400000>;
 
-&pinctrl {
-	usart1_default: usart1_default {
-		group0 {
-			pinmux = <USART1_TX_PD5_0>, <USART1_RX_PD6_0>;
-			bias-pull-up;
-			drive-push-pull;
-		};
+	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>;
 	};
 };
-
-&usart1 {
-	status = "okay";
-	current-speed = <115200>;
-	pinctrl-0 = <&usart1_default>;
-	pinctrl-names = "default";
-};

boards/luftchen/luftchen_defconfig

@@ -3,5 +3,9 @@ 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