diff --git a/examples/freertos/FreeRTOSConfig.h b/examples/freertos/FreeRTOSConfig.h
index 49a74915..6b521a6a 100644
--- a/examples/freertos/FreeRTOSConfig.h
+++ b/examples/freertos/FreeRTOSConfig.h
@@ -108,9 +108,14 @@ to exclude the API function. */
 header file. */
 void vApplicationMallocFailedHook(void);
 void vAssertCalled(void);
-#define configASSERT(x) \
-    if ((x) == 0)       \
-    vAssertCalled()
+#define configASSERT(x)                        \
+    if ((x) == 0) {                            \
+        printf("file [%s]\r\n", __FILE__);     \
+        printf("func [%s]\r\n", __FUNCTION__); \
+        printf("line [%d]\r\n", __LINE__);     \
+        printf("%s\r\n", (const char *)(#x));  \
+        vAssertCalled();                       \
+    }
 
 #if (configUSE_TICKLESS_IDLE != 0)
 void vApplicationSleep(uint32_t xExpectedIdleTime);
diff --git a/examples/peripherals/emac/lwip_http_server/FreeRTOSConfig.h b/examples/peripherals/emac/lwip_http_server/FreeRTOSConfig.h
index 164d8dd4..409ade00 100644
--- a/examples/peripherals/emac/lwip_http_server/FreeRTOSConfig.h
+++ b/examples/peripherals/emac/lwip_http_server/FreeRTOSConfig.h
@@ -108,9 +108,14 @@ to exclude the API function. */
 header file. */
 void vApplicationMallocFailedHook(void);
 void vAssertCalled(void);
-#define configASSERT(x) \
-    if ((x) == 0)       \
-    vAssertCalled()
+#define configASSERT(x)                        \
+    if ((x) == 0) {                            \
+        printf("file [%s]\r\n", __FILE__);     \
+        printf("func [%s]\r\n", __FUNCTION__); \
+        printf("line [%d]\r\n", __LINE__);     \
+        printf("%s\r\n", (const char *)(#x));  \
+        vAssertCalled();                       \
+    }
 
 #if (configUSE_TICKLESS_IDLE != 0)
 void vApplicationSleep(uint32_t xExpectedIdleTime);
diff --git a/examples/peripherals/emac/lwip_tcp/FreeRTOSConfig.h b/examples/peripherals/emac/lwip_tcp/FreeRTOSConfig.h
index 164d8dd4..409ade00 100644
--- a/examples/peripherals/emac/lwip_tcp/FreeRTOSConfig.h
+++ b/examples/peripherals/emac/lwip_tcp/FreeRTOSConfig.h
@@ -108,9 +108,14 @@ to exclude the API function. */
 header file. */
 void vApplicationMallocFailedHook(void);
 void vAssertCalled(void);
-#define configASSERT(x) \
-    if ((x) == 0)       \
-    vAssertCalled()
+#define configASSERT(x)                        \
+    if ((x) == 0) {                            \
+        printf("file [%s]\r\n", __FILE__);     \
+        printf("func [%s]\r\n", __FUNCTION__); \
+        printf("line [%d]\r\n", __LINE__);     \
+        printf("%s\r\n", (const char *)(#x));  \
+        vAssertCalled();                       \
+    }
 
 #if (configUSE_TICKLESS_IDLE != 0)
 void vApplicationSleep(uint32_t xExpectedIdleTime);
diff --git a/examples/peripherals/emac/lwip_tcp/tcp_client.c b/examples/peripherals/emac/lwip_tcp/tcp_client.c
index 560ec5dd..0689c56b 100644
--- a/examples/peripherals/emac/lwip_tcp/tcp_client.c
+++ b/examples/peripherals/emac/lwip_tcp/tcp_client.c
@@ -165,7 +165,7 @@ static void tcp_client_socket_test(void)
                 printf("write falied!\r\n");
                 break;
             }
-            arch_delay_us(100);
+            bflb_mtimer_delay_us(100);
             total_cnt += sizeof(send_buf);
         }
         printf("Total send data=0x%08lx%08lx\r\n",
diff --git a/examples/peripherals/emac/lwip_tcp/tcp_server.c b/examples/peripherals/emac/lwip_tcp/tcp_server.c
index 1792d436..46cc0341 100644
--- a/examples/peripherals/emac/lwip_tcp/tcp_server.c
+++ b/examples/peripherals/emac/lwip_tcp/tcp_server.c
@@ -226,6 +226,15 @@ static void tcp_server_socket_thread(void *arg)
     int sock, newconn, size;
     struct sockaddr_in address, remotehost;
 
+    tmpnetif = netif_find("bl");
+
+#if LWIP_DHCP
+    while (tmpnetif->state != 3) {
+        printf("wait DHCP get ip...\r\n");
+        vTaskDelay(1000);
+    }
+#endif
+
     printf("TCP Server create socket\r\n");
 
     /* create a TCP socket */
@@ -246,7 +255,6 @@ static void tcp_server_socket_thread(void *arg)
     /* listen for incoming connections (TCP listen backlog = 5) */
     listen(sock, 5);
 
-    tmpnetif = netif_find("bl");
     sprintf((char *)iptxt, "%s", ip4addr_ntoa(&tmpnetif->ip_addr));
     printf("Create server success, server ip & listen port:%s:%d\r\n", iptxt, TCP_SERVER_TEST_PORT);
 
diff --git a/examples/peripherals/emac/lwip_udp/FreeRTOSConfig.h b/examples/peripherals/emac/lwip_udp/FreeRTOSConfig.h
index 164d8dd4..409ade00 100644
--- a/examples/peripherals/emac/lwip_udp/FreeRTOSConfig.h
+++ b/examples/peripherals/emac/lwip_udp/FreeRTOSConfig.h
@@ -108,9 +108,14 @@ to exclude the API function. */
 header file. */
 void vApplicationMallocFailedHook(void);
 void vAssertCalled(void);
-#define configASSERT(x) \
-    if ((x) == 0)       \
-    vAssertCalled()
+#define configASSERT(x)                        \
+    if ((x) == 0) {                            \
+        printf("file [%s]\r\n", __FILE__);     \
+        printf("func [%s]\r\n", __FUNCTION__); \
+        printf("line [%d]\r\n", __LINE__);     \
+        printf("%s\r\n", (const char *)(#x));  \
+        vAssertCalled();                       \
+    }
 
 #if (configUSE_TICKLESS_IDLE != 0)
 void vApplicationSleep(uint32_t xExpectedIdleTime);
diff --git a/examples/peripherals/usbhost/FreeRTOSConfig.h b/examples/peripherals/usbhost/FreeRTOSConfig.h
index 49a74915..6b521a6a 100644
--- a/examples/peripherals/usbhost/FreeRTOSConfig.h
+++ b/examples/peripherals/usbhost/FreeRTOSConfig.h
@@ -108,9 +108,14 @@ to exclude the API function. */
 header file. */
 void vApplicationMallocFailedHook(void);
 void vAssertCalled(void);
-#define configASSERT(x) \
-    if ((x) == 0)       \
-    vAssertCalled()
+#define configASSERT(x)                        \
+    if ((x) == 0) {                            \
+        printf("file [%s]\r\n", __FILE__);     \
+        printf("func [%s]\r\n", __FUNCTION__); \
+        printf("line [%d]\r\n", __LINE__);     \
+        printf("%s\r\n", (const char *)(#x));  \
+        vAssertCalled();                       \
+    }
 
 #if (configUSE_TICKLESS_IDLE != 0)
 void vApplicationSleep(uint32_t xExpectedIdleTime);