diff --git a/mbtk/mbtk_lib/src/mbtk_gpio.c b/mbtk/mbtk_lib/src/mbtk_gpio.c
index 02e6e58..98cf422 100755
--- a/mbtk/mbtk_lib/src/mbtk_gpio.c
+++ b/mbtk/mbtk_lib/src/mbtk_gpio.c
@@ -467,13 +467,13 @@
             break;
         }
     }
-    usleep(100000);
+    //usleep(200000);
     for(i = 0; i <= 20; i++){
         ret = mbtk_gpio_adc();  
+        usleep(10000);
         if(1 == ret){
             break;
         }
-		usleep(100000);
     }
     //printf("------gpio should is high: %d.------\n", ret);
     if(1 != ret){
@@ -486,22 +486,22 @@
      usleep(200);
      for(i = 0; i <= 10; i++){
         gpio_register_set_value(port, 0);               //输出低
-        //usleep(50);
+        usleep(50);
         valuel = gpio_register_get_value(port);
-        //printf("set low? %d\n",valuel);
+        printf("set low? %d\n",valuel);
         if(0 == valuel){
             break;
         }
     }
-    usleep(100000);
+    //usleep(200000);
     for(i = 0; i <= 20; i++){
         ret = mbtk_gpio_adc();  
+        usleep(10000);
         if(0 == ret){
             break;
         }
-		usleep(100000);
     }
-    //printf("******gpio should is low: %d.******\n", ret);
+    printf("******gpio should is low: %d.******\n", ret);
     if(0 != ret){
         ret=-1;
         goto exit;
@@ -537,15 +537,15 @@
             gpio_register_set_direction(test_gpio[i], 1);
             gpio_register_set_value(test_gpio[i], 0);
         }
-      usleep(100000);
+      //usleep(200000);
       for(i = 0; i <= 20; i++){
-          ret = mbtk_gpio_adc();     
+          ret = mbtk_gpio_adc();
+          usleep(10000);
           if(0 == ret){
               break;
           }
-		  usleep(50000);
       }
-      //printf("pre set ADC: %d, times: %d\n",ret, j);
+      printf("pre set ADC: %d, times: %d\n",ret, j);
       if(0 == ret){
           break;
       }