fixed drv_gpio bug
@@ -257,7 +257,7 @@ const static struct rt_pin_ops drv_pin_ops =
int rt_hw_pin_init(void)
{
rt_err_t ret = RT_EOK;
- memset(pin_alloc_table, 0, sizeof pin_alloc_table);
+ memset(pin_alloc_table, -1, sizeof pin_alloc_table);
free_pin = GPIO_ALLOC_START;
ret = rt_device_pin_register("pin", &drv_pin_ops, RT_NULL);
