串口回调函数判断是那个串口触发的回调函数

发布于 2022-10-26 16:21:12 浏览：412 订阅该版

crystal266 2022-10-26

嵌入式

串口的中断回调函数第一个参数是 `rt_device_t dev`，定义如下

```c
struct rt_device
{
    struct rt_object          parent;                   /**< inherit from rt_object */

enum rt_device_class_type type;                     /**< device type */
    rt_uint16_t               flag;                     /**< device flag */
    rt_uint16_t               open_flag;                /**< device open flag */

rt_uint8_t                ref_count;                /**< reference count */
    rt_uint8_t                device_id;                /**< 0 - 255 */

/* device call back */
    rt_err_t (*rx_indicate)(rt_device_t dev, rt_size_t size);
    rt_err_t (*tx_complete)(rt_device_t dev, void *buffer);

#ifdef RT_USING_DEVICE_OPS
    const struct rt_device_ops *ops;
#else
    /* common device interface */
    rt_err_t  (*init)   (rt_device_t dev);
    rt_err_t  (*open)   (rt_device_t dev, rt_uint16_t oflag);
    rt_err_t  (*close)  (rt_device_t dev);
    rt_size_t (*read)   (rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size);
    rt_size_t (*write)  (rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size);
    rt_err_t  (*control)(rt_device_t dev, int cmd, void *args);
#endif

#if defined(RT_USING_POSIX)
    const struct dfs_file_ops *fops;
    struct rt_wqueue wait_queue;
#endif

void                     *user_data;                /**< device private data */
};

struct rt_object
{
    char       name[RT_NAME_MAX];                       /**< name of kernel object */
    rt_uint8_t type;                                    /**< type of kernel object */
    rt_uint8_t flag;                                    /**< flag of kernel object */

#ifdef RT_USING_MODULE
    void      *module_id;                               /**< id of application module */
#endif
    rt_list_t  list;                                    /**< list node of kernel object */
};
typedef struct rt_object *rt_object_t;                  /**< Type for kernel objects. */
```

在串口驱动注册时，每个串口的名字是不一样的，可以用 `dev->parent->name` 来进行区分。串口设备的名字在文件 drivers/include/config/uart_config.h 中定义。
```c
#ifndef UART1_CONFIG
#define UART1_CONFIG                                                \
    {                                                               \
        .name = "uart1",                                            \
        .Instance = USART1,                                         \
        .irq_type = USART1_IRQn,                                    \
        .tx_pin_name = BSP_UART1_TX_PIN,                            \
        .rx_pin_name = BSP_UART1_RX_PIN,                            \
    }
#endif /* UART1_CONFIG */

#ifndef UART2_CONFIG
#define UART2_CONFIG                                                \
    {                                                               \
        .name = "uart2",                                            \
        .Instance = USART2,                                         \
        .irq_type = USART2_IRQn,                                    \
        .tx_pin_name = BSP_UART2_TX_PIN,                            \
        .rx_pin_name = BSP_UART2_RX_PIN,                            \
    }
#endif /* UART2_CONFIG */
```