这次不吐槽了，但我觉得还是有必要加一个rt_pin_toggle操作

发布于 2019-02-26 22:06:48 浏览：2260 订阅该版

* 本帖最后由 黄侃 于 2019-2-26 22:08 编辑 *

toggle基本默认为电平翻转功能，最常用的就是LED闪烁（还是吐槽一下，官方BSP自带一个LED闪烁进程，亮500ms，灭500ms，看的好别扭）
:sleepy: 
5分钟可以改完：

1）drv_gpio.c中增加一个toggle方法：

```
static void stm32_pin_toggle(rt_device_t dev, rt_base_t pin)
{
    const struct pin_index *index;

index = get_pin(pin);
    if (index == RT_NULL)
    {
        return;
    }

HAL_GPIO_TogglePin(index->gpio, index->pin);
}
```

2）然后下面的ops列表里添加toggle方法：
```
const static struct rt_pin_ops _stm32_pin_ops =
{
    stm32_pin_mode,
    stm32_pin_write,
    stm32_pin_toggle,
    stm32_pin_read,
    stm32_pin_attach_irq,
    stm32_pin_dettach_irq,
    stm32_pin_irq_enable,
};
```

3）当然rt_pin_ops的结构体里也得添加一个函数指针
```
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);
    void (*pin_toggle)(struct rt_device *device, rt_base_t pin);
    int (*pin_read)(struct rt_device *device, rt_base_t pin);

/* TODO: add GPIO interrupt */
    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);
};
```

4）修改pin.c中间层，将toggle方法链接上：
```
{
    RT_NULL,
    RT_NULL,
    RT_NULL,
    _pin_read,
    _pin_write,
    _pin_toggle,
    _pin_control
};
```

5）编写_pin_toggle的实体（真麻烦:sleepy: ，但是为了统一接口哎）
```
static rt_size_t _pin_toggle(rt_device_t dev, rt_off_t pos, const 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;

pin->ops->pin_toggle(dev, (rt_base_t)status->pin);

return size;
}
```

6）最后添加外部接口API：
```
void rt_pin_toggle(rt_base_t pin)
{
    RT_ASSERT(_hw_pin.ops != RT_NULL);
    _hw_pin.ops->pin_toggle(&_hw_pin.parent, pin);
}
FINSH_FUNCTION_EXPORT_ALIAS(rt_pin_toggle, pinToggle, toggle the hardware pin);
```

现在应该OK了，去main线程里测试：
![1.png](/uploads/201902/26/220556s33999i8zbh941ll.png)

好了，舒服了:hug: