RT-Thread4.1.0的SDK下rt_pin_get()未返回正确的引脚编号

发布于 2023-01-04 15:48:59 浏览：782 订阅该版

用RT-Thread4.1.0的SDK开发程序，在使用PIN中断时注册失败，发现rt_pin_get函数一直返回-6，PIN在初始化时 _stm32_pin_ops 结构体没有注册 pin_get函数导致。
```C
// PIN初始化接口未注册pin_get
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);
};

const static struct rt_pin_ops _stm32_pin_ops =
{
    stm32_pin_mode,
    stm32_pin_write,
    stm32_pin_read,
    stm32_pin_attach_irq,
    stm32_pin_dettach_irq,
    stm32_pin_irq_enable,
};
// 导致 _hw_pin.ops->pin_get == RT_NULL 返回-6
rt_base_t rt_pin_get(const char *name)
{
    RT_ASSERT(_hw_pin.ops != RT_NULL);
    RT_ASSERT(name[0] == 'P');

if(_hw_pin.ops->pin_get == RT_NULL)
    {
        return -RT_ENOSYS;
    }

return _hw_pin.ops->pin_get(name);
}
```