diff --git a/c/src/p2fa.c b/c/src/p2fa.c
index c2b0f05..5807981 100644
--- a/c/src/p2fa.c
+++ b/c/src/p2fa.c
@@ -29,6 +29,89 @@ void Handler(int sigNum) {
 }
 
 int draw() {
+    Paint_NewImage(BlackImage, EPD_2in13_V4_WIDTH, EPD_2in13_V4_HEIGHT, 90, WHITE);
+    Debug("Drawing\r\n");
+    //1.Select Image
+    EPD_2in13_V4_Init();
+    Paint_SelectImage(BlackImage);
+    Paint_Clear(WHITE);
+
+    // 2.Drawing on the image
+    Paint_DrawPoint(5, 10, BLACK, DOT_PIXEL_1X1, DOT_STYLE_DFT);
+    Paint_DrawPoint(5, 25, BLACK, DOT_PIXEL_2X2, DOT_STYLE_DFT);
+    Paint_DrawPoint(5, 40, BLACK, DOT_PIXEL_3X3, DOT_STYLE_DFT);
+    Paint_DrawPoint(5, 55, BLACK, DOT_PIXEL_4X4, DOT_STYLE_DFT);
+
+    Paint_DrawLine(20, 10, 70, 60, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
+    Paint_DrawLine(70, 10, 20, 60, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
+    Paint_DrawRectangle(20, 10, 70, 60, BLACK, DOT_PIXEL_1X1, DRAW_FILL_EMPTY);
+    Paint_DrawRectangle(85, 10, 135, 60, BLACK, DOT_PIXEL_1X1, DRAW_FILL_FULL);
+
+    Paint_DrawLine(45, 15, 45, 55, BLACK, DOT_PIXEL_1X1, LINE_STYLE_DOTTED);
+    Paint_DrawLine(25, 35, 70, 35, BLACK, DOT_PIXEL_1X1, LINE_STYLE_DOTTED);
+    Paint_DrawCircle(45, 35, 20, BLACK, DOT_PIXEL_1X1, DRAW_FILL_EMPTY);
+    Paint_DrawCircle(110, 35, 20, WHITE, DOT_PIXEL_1X1, DRAW_FILL_FULL);
+
+    Paint_DrawString(140, 15, "waveshare", &Font16, BLACK, WHITE);
+    Paint_DrawNum(140, 40, 123456789, &Font16, BLACK, WHITE);
+
+    EPD_2in13_V4_Display_Base(BlackImage);
+    DEV_Delay_ms(3000);
+
+    Paint_NewImage(BlackImage, EPD_2in13_V4_WIDTH, EPD_2in13_V4_HEIGHT, 90, WHITE);
+    Debug("Partial refresh\r\n");
+    Paint_SelectImage(BlackImage);
+
+    PAINT_TIME sPaint_time;
+    sPaint_time.Hour = 12;
+    sPaint_time.Min = 34;
+    sPaint_time.Sec = 56;
+    UBYTE num = 10;
+    for (;;) {
+        sPaint_time.Sec = sPaint_time.Sec + 1;
+        if (sPaint_time.Sec == 60) {
+            sPaint_time.Min = sPaint_time.Min + 1;
+            sPaint_time.Sec = 0;
+            if (sPaint_time.Min == 60) {
+                sPaint_time.Hour =  sPaint_time.Hour + 1;
+                sPaint_time.Min = 0;
+                if (sPaint_time.Hour == 24) {
+                    sPaint_time.Hour = 0;
+                    sPaint_time.Min = 0;
+                    sPaint_time.Sec = 0;
+                }
+            }
+        }
+        Paint_ClearWindows(150, 80, 150 + Font20.Width * 7, 80 + Font20.Height, WHITE);
+        Paint_DrawTime(150, 80, &sPaint_time, &Font20, WHITE, BLACK);
+
+        num = num - 1;
+        if(num == 0) {
+            break;
+        }
+        EPD_2in13_V4_Display_Partial(BlackImage);
+        DEV_Delay_ms(500);//Analog clock 1s
+
+        DEV_Delay_ms(5000);
+
+        Debug("Clear...\r\n");
+        EPD_2in13_V4_Init();
+        EPD_2in13_V4_Clear();
+
+        Debug("Goto Sleep...\r\n");
+        EPD_2in13_V4_Sleep();
+        free(BlackImage);
+        BlackImage = NULL;
+
+        DEV_Delay_ms(2000);//important, at least 2s
+        // close 5V
+        Debug("close 5V, Module enters 0 power consumption ...\r\n");
+
+        DEV_Module_Exit();
+        return 0;
+}
+
+int drawn() {
     if (DEV_Module_Init() != 0) {
         return -1;
     }