diff --git a/applications/drv_ec800k.c b/applications/drv_ec800k.c
index 98fba92..8158480 100644
--- a/applications/drv_ec800k.c
+++ b/applications/drv_ec800k.c
@@ -6,9 +6,8 @@
  */
 
 #include "drv_ec800k.h"
-
 #include <stdint.h>
-
+#include "VK_Com.h"
 #include "rtdef.h"
 #include "rtthread.h"
 #include "rttypes.h"
@@ -293,4 +292,17 @@ void BSP_LTE_Config(void) {
   lte_dev.config_sta = true;
 }
 
+void hw_printf(const char *fmt, ...) {
+  char buff[128];
+  va_list args;
+  va_start(args, fmt);
+
+  rt_vsnprintf(buff, sizeof(buff), fmt, args);
+  va_end(args);
+
+  rt_device_t com_dev = fmu_com_get();
+  if (com_dev != RT_NULL) {
+    rt_device_write(com_dev, 0, buff, rt_strlen(buff));
+  }
+}
 //------------------End of File----------------------------
diff --git a/applications/drv_ec800k.h b/applications/drv_ec800k.h
index bd2bf7f..21b051a 100644
--- a/applications/drv_ec800k.h
+++ b/applications/drv_ec800k.h
@@ -294,6 +294,7 @@ int16_t BSP_LTE_Send_Cmd_FileRead(const char *cmd, uint16_t len,
 
 void tcp_connect_test(void);
 
+void hw_printf(const char *fmt, ...);
 // void test_ec800k_ota(void);
 
 #ifdef __cplusplus