samples: Added native posix board to cfb sample

Added support for native posix board to character framebuffer sample.

Signed-off-by: Jan Van Winkel <jan.van_winkel@dxplore.eu>

samples/display/cfb/prj.conf

@@ -5,7 +5,6 @@ CONFIG_HEAP_MEM_POOL_SIZE=16384
 CONFIG_DISPLAY=y
 
 CONFIG_LOG=y
-CONFIG_DISPLAY_LOG_LEVEL_DBG=y
 
 CONFIG_CFB_LOG_LEVEL_DBG=y
 CONFIG_CHARACTER_FRAMEBUFFER=y

samples/display/cfb/prj_native_posix.conf

@@ -0,0 +1,11 @@
+CONFIG_HEAP_MEM_POOL_SIZE=16384
+
+CONFIG_DISPLAY=y
+CONFIG_SDL_DISPLAY_DEV_NAME="DISPLAY"
+CONFIG_SDL_DISPLAY_X_RES=250
+CONFIG_SDL_DISPLAY_Y_RES=120
+
+CONFIG_LOG=y
+
+CONFIG_CFB_LOG_LEVEL_DBG=y
+CONFIG_CHARACTER_FRAMEBUFFER=y

samples/display/cfb/src/main.c

@@ -17,6 +17,10 @@
 #define DISPLAY_DRIVER				"SSD1306"
 #endif
 
+#ifndef DISPLAY_DRIVER
+#define DISPLAY_DRIVER "DISPLAY"
+#endif
+
 void main(void)
 {
 	struct device *dev;
@@ -33,6 +37,11 @@ void main(void)
 		return;
 	}
 
+	if (display_set_pixel_format(dev, PIXEL_FORMAT_MONO10) != 0) {
+		printf("Failed to set required pixel format\n");
+		return;
+	}
+
 	printf("initialized %s\n", DISPLAY_DRIVER);
 
 	if (cfb_framebuffer_init(dev)) {
@@ -43,6 +52,8 @@ void main(void)
 	api = dev->driver_api;
 	cfb_framebuffer_clear(dev, true);
 
+	display_blanking_off(dev);
+
 	rows = cfb_get_display_parameter(dev, CFB_DISPLAY_ROWS);
 	ppt = cfb_get_display_parameter(dev, CFB_DISPLAY_PPT);
 
@@ -73,6 +84,9 @@ void main(void)
 			}
 
 			cfb_framebuffer_finalize(dev);
+#if defined(CONFIG_ARCH_POSIX)
+			k_sleep(100);
+#endif
 		}
 	}
 }