5 IO设备驱动PIN驱动写法问题

发布于 2022-11-23 12:00:54 浏览：646 订阅该版

```c
static rt_size_t _pin_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
{
    struct rt_device_pin_status *status;
    struct rt_device_pin *pin = (struct rt_device_pin *)dev;

/* check parameters */
    RT_ASSERT(pin != RT_NULL);

status = (struct rt_device_pin_status *)buffer;
    if (status == RT_NULL || size != sizeof(*status))
        return 0;

status->status = pin->ops->pin_read(dev, status->pin);
    return size;
}
```
上图中的`struct rt_device_pin *pin = (struct rt_device_pin *)dev;`感觉有问题啊，然后pin驱动的ops也是跟其他IO设备驱动有差异，竟然直接传入`struct rt_device` ，不是应该传入`struct rt_device_pin`指针吗

```c
struct rt_pin_ops
{
    void (*pin_mode)(struct rt_device *device, rt_base_t pin, rt_base_t mode);
    void (*pin_write)(struct rt_device *device, rt_base_t pin, rt_base_t value);
    int (*pin_read)(struct rt_device *device, rt_base_t pin);
    rt_err_t (*pin_attach_irq)(struct rt_device *device, rt_int32_t pin,
                      rt_uint32_t mode, void (*hdr)(void *args), void *args);
    rt_err_t (*pin_detach_irq)(struct rt_device *device, rt_int32_t pin);
    rt_err_t (*pin_irq_enable)(struct rt_device *device, rt_base_t pin, rt_uint32_t enabled);
    rt_base_t (*pin_get)(const char *name);
};
```