copy stuff from display example

app/prj.conf

@@ -5,3 +5,14 @@
 
 CONFIG_SENSOR=y
 CONFIG_BLINK=y
+
+CONFIG_STDOUT_CONSOLE=y
+
+CONFIG_HEAP_MEM_POOL_SIZE=16384
+
+CONFIG_DISPLAY=y
+
+CONFIG_LOG=y
+
+CONFIG_CFB_LOG_LEVEL_DBG=y
+CONFIG_CHARACTER_FRAMEBUFFER=y

app/src/main.c

@@ -6,6 +6,7 @@
 #include <zephyr/kernel.h>
 #include <zephyr/drivers/sensor.h>
 #include <zephyr/logging/log.h>
+#include <zephyr/display/cfb.h>
 
 #include <app/drivers/blink.h>
 
@@ -18,6 +19,89 @@ LOG_MODULE_REGISTER(main, CONFIG_APP_LOG_LEVEL);
 
 int main(void)
 {
+	const struct device *dev;
+	uint16_t x_res;
+	uint16_t y_res;
+	uint16_t rows;
+	uint8_t ppt;
+	uint8_t font_width;
+	uint8_t font_height;
+
+	dev = DEVICE_DT_GET(DT_CHOSEN(zephyr_display));
+	if (!device_is_ready(dev))
+	{
+		printf("Device %s not ready\n", dev->name);
+		return 0;
+	}
+
+	if (display_set_pixel_format(dev, PIXEL_FORMAT_MONO10) != 0)
+	{
+		if (display_set_pixel_format(dev, PIXEL_FORMAT_MONO01) != 0)
+		{
+			printf("Failed to set required pixel format");
+			return 0;
+		}
+	}
+
+	printf("Initialized %s\n", dev->name);
+
+	if (cfb_framebuffer_init(dev))
+	{
+		printf("Framebuffer initialization failed!\n");
+		return 0;
+	}
+
+	cfb_framebuffer_clear(dev, true);
+
+	display_blanking_off(dev);
+
+	x_res = cfb_get_display_parameter(dev, CFB_DISPLAY_WIDTH);
+	y_res = cfb_get_display_parameter(dev, CFB_DISPLAY_HEIGH);
+	rows = cfb_get_display_parameter(dev, CFB_DISPLAY_ROWS);
+	ppt = cfb_get_display_parameter(dev, CFB_DISPLAY_PPT);
+
+	for (int idx = 0; idx < 42; idx++)
+	{
+		if (cfb_get_font_size(dev, idx, &font_width, &font_height))
+		{
+			break;
+		}
+		cfb_framebuffer_set_font(dev, idx);
+		printf("font width %d, font height %d\n",
+			   font_width, font_height);
+	}
+
+	printf("x_res %d, y_res %d, ppt %d, rows %d, cols %d\n",
+		   x_res,
+		   y_res,
+		   ppt,
+		   rows,
+		   cfb_get_display_parameter(dev, CFB_DISPLAY_COLS));
+
+	cfb_framebuffer_invert(dev);
+
+	cfb_set_kerning(dev, 3);
+
+	while (1)
+	{
+		for (int i = 0; i < MIN(x_res, y_res); i++)
+		{
+			cfb_framebuffer_clear(dev, false);
+			if (cfb_print(dev,
+						  "0123456789mMgj!\"§$%&/()=",
+						  i, i))
+			{
+				printf("Failed to print a string\n");
+				continue;
+			}
+
+			cfb_framebuffer_finalize(dev);
+#if defined(CONFIG_ARCH_POSIX)
+			k_sleep(K_MSEC(20));
+#endif
+		}
+	}
+
 	int ret;
 	unsigned int period_ms = BLINK_PERIOD_MS_MAX;
 	const struct device *sensor, *blink;