format pin.c

components/drivers/misc/pin.c

@@ -111,6 +111,7 @@ rt_err_t rt_pin_attach_irq(rt_int32_t pin, rt_uint32_t mode,
     }
     return -RT_ENOSYS;
 }
+
 rt_err_t rt_pin_detach_irq(rt_int32_t pin)
 {
     RT_ASSERT(_hw_pin.ops != RT_NULL);
@@ -166,4 +167,3 @@ rt_base_t rt_pin_get(const char *name)
     return _hw_pin.ops->pin_get(name);
 }
 FINSH_FUNCTION_EXPORT_ALIAS(rt_pin_get, pinGet, get pin number from hardware pin);
-