add GuiLite demo

examples/guilite_demo/guilite_demo.c

@@ -0,0 +1,38 @@
+#include "cmsis_os.h"
+#include "lcd_spi2_drv.h"
+
+
+void delay_ms(int ms)
+{
+	tos_task_delay(ms);
+}
+
+//Transfer GuiLite 32 bits color to your LCD color
+#define GL_RGB_32_to_16(rgb) (((((unsigned int)(rgb)) & 0xFF) >> 3) | ((((unsigned int)(rgb)) & 0xFC00) >> 5) | ((((unsigned int)(rgb)) & 0xF80000) >> 8))
+//Encapsulate your LCD driver:
+void gfx_draw_pixel(int x, int y, unsigned int rgb)
+{
+	//LCD_Fast_DrawPoint(x, y, GL_RGB_32_to_16(rgb));
+	LCD_Draw_ColorPoint(x, y, GL_RGB_32_to_16(rgb));
+}
+//Implement it, if you have more fast solution than drawing pixels one by one.
+//void gfx_fill_rect(int x0, int y0, int x1, int y1, unsigned int rgb){}
+
+//UI entry
+struct EXTERNAL_GFX_OP
+{
+	void (*draw_pixel)(int x, int y, unsigned int rgb);
+	void (*fill_rect)(int x0, int y0, int x1, int y1, unsigned int rgb);
+} my_gfx_op;
+extern void startHelloStar(void* phy_fb, int width, int height, int color_bytes, struct EXTERNAL_GFX_OP* gfx_op);
+
+void application_entry(void *arg)
+{
+		printf("This is GuiLite Demo!\r\n");
+		my_gfx_op.draw_pixel = gfx_draw_pixel;
+		my_gfx_op.fill_rect = NULL;//gfx_fill_rect;
+		startHelloStar(NULL, 240, 240, 2, &my_gfx_op);
+    
+}
+
+