diff --git a/components/drivers/i2c/i2c-bit-ops.c b/components/drivers/i2c/i2c-bit-ops.c
index 17ce9df..8c60d2e 100644
--- a/components/drivers/i2c/i2c-bit-ops.c
+++ b/components/drivers/i2c/i2c-bit-ops.c
@@ -25,12 +25,12 @@
 
 rt_inline void i2c_delay(struct rt_i2c_bit_ops *ops)
 {
-    ops->udelay((ops->delay_us + 1) >> 1);
+    ops->ndelay((ops->delay_ns + 1) >> 1);
 }
 
 rt_inline void i2c_delay2(struct rt_i2c_bit_ops *ops)
 {
-    ops->udelay(ops->delay_us);
+    ops->ndelay(ops->delay_ns);
 }
 
 #define SDA_L(ops)          SET_SDA(ops, 0)
@@ -47,7 +47,10 @@ static rt_err_t SCL_H(struct rt_i2c_bit_ops *ops)
     SET_SCL(ops, 1);
 
     if (!ops->get_scl)
-        goto done;
+    {
+        i2c_delay(ops);
+        return RT_EOK;
+    }
 
     start = rt_tick_get();
     i2c_delay(ops);
@@ -65,9 +68,6 @@ static rt_err_t SCL_H(struct rt_i2c_bit_ops *ops)
     }
 #endif
 
-done:
-    i2c_delay(ops);
-
     return RT_EOK;
 }
 
@@ -181,7 +181,7 @@ static rt_int32_t i2c_readb(struct rt_i2c_bus_device *bus)
         if (GET_SDA(ops))
             data |= 1;
         SCL_L(ops);
-        i2c_delay2(ops);
+        i2c_delay(ops);
     }
 
     return data;
diff --git a/components/drivers/include/drivers/i2c-bit-ops.h b/components/drivers/include/drivers/i2c-bit-ops.h
index 0d94de1..5935968 100644
--- a/components/drivers/include/drivers/i2c-bit-ops.h
+++ b/components/drivers/include/drivers/i2c-bit-ops.h
@@ -11,6 +11,9 @@
 #ifndef __I2C_BIT_OPS_H__
 #define __I2C_BIT_OPS_H__
 
+#include <rtdef.h>
+#include <rtdevice.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -23,9 +26,9 @@ struct rt_i2c_bit_ops
     rt_int32_t (*get_sda)(void *data);
     rt_int32_t (*get_scl)(void *data);
 
-    void (*udelay)(rt_uint32_t us);
+    void (*ndelay)(rt_uint32_t us);
 
-    rt_uint32_t delay_us;  /* scl and sda line delay */
+    rt_uint32_t delay_ns;  /* scl and sda line delay */
     rt_uint32_t timeout;   /* in tick */
 };