real use of the display

app/src/main.c

@@ -70,6 +70,7 @@ int main(void)
 		printf("font width %d, font height %d\n",
 			   font_width, font_height);
 	}
+	cfb_framebuffer_set_font(dev, 0);
 
 	printf("x_res %d, y_res %d, ppt %d, rows %d, cols %d\n",
 		   x_res,
@@ -91,47 +92,52 @@ int main(void)
 
 	while (1)
 	{
-		for (int i = 0; i < MIN(x_res, y_res); i++)
+		int ret;
+		char str_v[15] = {0};
+		char str_i[15] = {0};
+
+		ret = sensor_sample_fetch(ina);
+		if (ret < 0)
 		{
-			int ret;
+			LOG_ERR("Could not fetch sample (%d)", ret);
-
+			return 0;
-			ret = sensor_sample_fetch(ina);
-			if (ret < 0)
-			{
-				LOG_ERR("Could not fetch sample (%d)", ret);
-				return 0;
-			}
-
-			struct sensor_value voltage, current;
-			ret = sensor_channel_get(ina, SENSOR_CHAN_VOLTAGE, &voltage);
-			if (ret < 0)
-			{
-				LOG_ERR("Could not get sample (%d)", ret);
-				return 0;
-			}
-			ret = sensor_channel_get(ina, SENSOR_CHAN_CURRENT, &current);
-			if (ret < 0)
-			{
-				LOG_ERR("Could not get sample (%d)", ret);
-				return 0;
-			}
-
-			printf("voltage: %d.%06d\tcurrent: %d.%06d\n", voltage.val1, voltage.val2, current.val1, current.val2);
-
-			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
 		}
+
+		struct sensor_value voltage, current;
+		ret = sensor_channel_get(ina, SENSOR_CHAN_VOLTAGE, &voltage);
+		if (ret < 0)
+		{
+			LOG_ERR("Could not get sample (%d)", ret);
+			return 0;
+		}
+		ret = sensor_channel_get(ina, SENSOR_CHAN_CURRENT, &current);
+		if (ret < 0)
+		{
+			LOG_ERR("Could not get sample (%d)", ret);
+			return 0;
+		}
+
+		sprintf(str_v, "V:%d.%06d", voltage.val1, voltage.val2);
+		sprintf(str_i, "I:%d.%06d", current.val1, current.val2);
+
+		printf("%s\t%s\n", str_v, str_i);
+
+		cfb_framebuffer_clear(dev, false);
+		if (cfb_print(dev, str_v, 0, 0))
+		{
+			printf("Failed to print a string\n");
+			continue;
+		}
+		if (cfb_print(dev, str_i, 0, 16))
+		{
+			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;