RT-Thread-【NXP-MCXA153】RTT PIN驱动添加RT-Thread问答社区

【NXP-MCXA153】RTT PIN驱动添加

发布于 2024-06-27 18:03:23 浏览：243 订阅该版

[tocm]

## Pin驱动框架

![1.png](https://oss-club.rt-thread.org/uploads/20240627/1aef16222aba6522637bc53cdf2cdb59.png)

### PIN设备驱动层

**单纯的提供接口给应用层用，其中PIN设备驱动框架接口包含rt\_pin\_read等，具体在pin.c 文件中查看**

* **pin.c是提供应用接口**
* **drv\_gpio.c是具体实现**

### 1、实现操作方法原理

```c
struct rt_pin_ops
{
    void (*pin_mode)(struct rt_device *device, rt_base_t pin, rt_uint8_t mode);
    void (*pin_write)(struct rt_device *device, rt_base_t pin, rt_uint8_t value);
    rt_ssize_t  (*pin_read)(struct rt_device *device, rt_base_t pin);
    rt_err_t (*pin_attach_irq)(struct rt_device *device, rt_base_t pin,
            rt_uint8_t mode, void (*hdr)(void *args), void *args);
    rt_err_t (*pin_detach_irq)(struct rt_device *device, rt_base_t pin);
    rt_err_t (*pin_irq_enable)(struct rt_device *device, rt_base_t pin, rt_uint8_t enabled);
    rt_base_t (*pin_get)(const char *name);
#ifdef RT_USING_DM
    rt_err_t (*pin_irq_mode)(struct rt_device *device, rt_base_t pin, rt_uint8_t mode);
    rt_ssize_t (*pin_parse)(struct rt_device *device, struct rt_ofw_cell_args *args, rt_uint32_t *flags);
#endif
#ifdef RT_USING_PINCTRL
    rt_err_t (*pin_ctrl_confs_apply)(struct rt_device *device, void *fw_conf_np);
#endif /* RT_USING_PINCTRL */
};
```

* **rt\_pin\_ops 成员介绍**
  
  * **pin\_mode**
* **引脚初始化**
* **pin\_write**
* **引脚写**
* **pin\_read**
* **引脚读**
* **pin\_attach\_irq**
* **中断操作 为某个引脚绑定一个中断回调函数，使能中断，当中断来时调用该函数**
* **pin\_detach\_irq**
* **中断操作	脱离某个引脚的中断回调函数**
* **pin\_irq\_enable**
* **中断操作 开启或关闭中断**
* **pin\_get**
* **获取某个pin脚编号**
* **pin\_irq\_mode**
* **pin\_parse**
* **pin\_ctrl\_confs\_apply**
* **引脚编号**

```c
#define GET_GPIO_PORT(x)      ((x) / 32)
#define GET_GPIO_PIN(x)       ((x) % 32)
```

* **rt\_pin\_ops 赋值**

```c
rt_hw_pin_init()
{
    int ret = RT_EOK;

mcx_pin_ops.pin_mode        = mcx_pin_mode;
    mcx_pin_ops.pin_read        = mcx_pin_read;
    mcx_pin_ops.pin_write       = mcx_pin_write;
    mcx_pin_ops.pin_attach_irq  = mcx_pin_attach_irq;
    mcx_pin_ops.pin_detach_irq  = mcx_pin_detach_irq;
    mcx_pin_ops.pin_irq_enable  = mcx_pin_irq_enable;
    mcx_pin_ops.pin_get         = RT_NULL,

ret = rt_device_pin_register("pin", &mcx_pin_ops, RT_NULL);//

return ret;
}
INIT_BOARD_EXPORT(rt_hw_pin_init);
```

* **注意： 这里的操作很奇怪INIT\_BOARD\_EXPORT ，根据老师的讲解是在预编译的时候就处理了，具体后面再学习。。。**
* **drv\_pin.c 的 rt\_hw\_pin\_init 将底层驱动和驱动框架进行链接起来，此文件实现gpio的初始化**

## 添加Pin驱动代码流程

* **编写drv\_pin.c文件**
  
  * **实现 rt\_pin\_ops 的各种操作接口函数**
* **然后利用  rt\_hw\_pin\_init 进行链接驱动层**
  
  * **实际上就是指针的赋值**

## 实验代码
```c
rt_pin_mode(LED_PIN, PIN_MODE_OUTPUT);  /* Set GPIO as Output */
rt_pin_mode(KEY_BAND, PIN_MODE_INPUT);
rt_kprintf("MCXA153 HelloWorld\r\n");

while (1)
{
    rt_thread_mdelay(1000);
    if(rt_pin_read(KEY_BAND))
        rt_pin_write(LED_PIN, PIN_HIGH);    /* Set GPIO output 1 */
    else
        rt_pin_write(LED_PIN, PIN_LOW);     /* Set GPIO output 0 */
    #if 0 
    rt_pin_write(LED_PIN, PIN_HIGH);    /* Set GPIO output 1 */
    rt_thread_mdelay(500);               /* Delay 500mS */
    rt_pin_write(LED_PIN, PIN_LOW);     /* Set GPIO output 0 */
    rt_thread_mdelay(500);               /* Delay 500mS */
    #endif
}
```
注意：这里延迟1s,目的是为了有msh 功能
## 总结

**学习了PIN设备驱动框架的添加**