diff --git a/c/src/p2fa.c b/c/src/p2fa.c
index 5807981..755ca9e 100644
--- a/c/src/p2fa.c
+++ b/c/src/p2fa.c
@@ -29,6 +29,27 @@ void Handler(int sigNum) {
 }
 
 int draw() {
+    Debug("EPD_2in13_V4_test Demo\r\n");
+    if(DEV_Module_Init()!=0){
+        return -1;
+    }
+    Debug("e-Paper Init and Clear...\r\n");
+    EPD_2in13_V4_Init();
+
+    struct timespec start={0,0}, finish={0,0};
+    clock_gettime(CLOCK_REALTIME,&start);
+    EPD_2in13_V4_Clear();
+    clock_gettime(CLOCK_REALTIME,&finish);
+    Debug("%ld S\r\n",finish.tv_sec-start.tv_sec);
+
+    //Create a new image cache
+    UBYTE *BlackImage;
+    UWORD Imagesize = ((EPD_2in13_V4_WIDTH % 8 == 0)? (EPD_2in13_V4_WIDTH / 8 ): (EPD_2in13_V4_WIDTH / 8 + 1)) * EPD_2in13_V4_HEIGHT;
+    if((BlackImage = (UBYTE *)malloc(Imagesize)) == NULL) {
+        Debug("Failed to apply for black memory...\r\n");
+        return -1;
+    }
+
     Paint_NewImage(BlackImage, EPD_2in13_V4_WIDTH, EPD_2in13_V4_HEIGHT, 90, WHITE);
     Debug("Drawing\r\n");
     //1.Select Image
@@ -73,7 +94,7 @@ int draw() {
             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.Hour = sPaint_time.Hour + 1;
                 sPaint_time.Min = 0;
                 if (sPaint_time.Hour == 24) {
                     sPaint_time.Hour = 0;
@@ -86,29 +107,30 @@ int draw() {
         Paint_DrawTime(150, 80, &sPaint_time, &Font20, WHITE, BLACK);
 
         num = num - 1;
-        if(num == 0) {
+        if (num == 0) {
             break;
         }
         EPD_2in13_V4_Display_Partial(BlackImage);
         DEV_Delay_ms(500);//Analog clock 1s
 
-        DEV_Delay_ms(5000);
+    }
+    DEV_Delay_ms(5000);
 
-        Debug("Clear...\r\n");
-        EPD_2in13_V4_Init();
-        EPD_2in13_V4_Clear();
+    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;
+    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_Delay_ms(2000);//important, at least 2s
+    // close 5V
+    Debug("close 5V, Module enters 0 power consumption ...\r\n");
 
-        DEV_Module_Exit();
-        return 0;
+    DEV_Module_Exit();
+    return 0;
 }
 
 int drawn() {