diff --git a/main.c b/main.c
index 010ce59..b568c24 100644
--- a/main.c
+++ b/main.c
@@ -65,6 +65,15 @@ int main(void)
 {
     stdio_init_all();
     sleep_ms(1000);
+    set_sys_clock_khz(250000, true);
+    
+    if (watchdog_caused_reboot()) { // 判断是否从看门狗启动或者正常启动
+        printf("Rebooted by Watchdog!\n");
+    } else {
+        printf("Clean boot\n");
+    }
+    watchdog_enable(8300, 1);   // 8秒检测是否重新加载看门狗计数器. (不更新计数器则重启硬件, 最高8秒)
+    watchdog_start_tick(12);
 
     printf("EC800M\n");
     EC800M_INIT();
@@ -73,6 +82,7 @@ int main(void)
     GPS_ gps_;
 
     while (1) {
+        watchdog_update();      // 喂狗
         strcpy(gps_data, EC800M());
         Data_parsing(gps_data, &gps_);
         printf(" T: %s\n N: %s\n E: %s\n", gps_.time, gps_.N, gps_.E);
diff --git a/main.h b/main.h
index c9ead74..ec3fe80 100644
--- a/main.h
+++ b/main.h
@@ -7,4 +7,7 @@
 #include "pico/stdlib.h"
 #include "hardware/uart.h"
 
+#include "hardware/clocks.h"
+#include "hardware/watchdog.h"
+
 #endif