diff --git a/chip/basic/clock.cpp b/chip/basic/clock.cpp
index 452294e..9f04344 100644
--- a/chip/basic/clock.cpp
+++ b/chip/basic/clock.cpp
@@ -51,4 +51,17 @@ void zchip_clock_early_delayus(uint32_t n) {
     __zchip_clock_early_delayus(1000);
   }
 }
-}
\ No newline at end of file
+}
+
+void zchip_clock_early_delayus2(uint32_t us) { __zchip_clock_early_delayus(us); }
+void zchip_clock_early_delayus_timer_start() {
+  __HAL_TIM_SET_COUNTER(m_usdleaytim, 0);
+  HAL_TIM_Base_Start(m_usdleaytim);
+}
+uint32_t zchip_clock_early_delayus_timer_haspassed() {
+  uint32_t counter = __HAL_TIM_GET_COUNTER(m_usdleaytim);
+  return counter;
+}
+void zchip_clock_early_delayus_timer_stop(){
+  HAL_TIM_Base_Stop(m_usdleaytim);
+}
diff --git a/chip/basic/clock.hpp b/chip/basic/clock.hpp
index 8816d9f..1b9e912 100644
--- a/chip/basic/clock.hpp
+++ b/chip/basic/clock.hpp
@@ -16,4 +16,8 @@ uint32_t zchip_clock_init(zchip_clock_cfg_t* cfg);
 uint32_t zchip_clock_get_ticket(void);
 uint32_t zchip_clock_hasspassed(uint32_t ticket);
 void     zchip_clock_early_delayus(uint32_t us);
+void     zchip_clock_early_delayus2(uint32_t us);
+void     zchip_clock_early_delayus_timer_start();
+uint32_t zchip_clock_early_delayus_timer_haspassed();
+void     zchip_clock_early_delayus_timer_stop();
 }