I2C 设备驱动框架

关于I2C驱动框架存在的问题

发布于 2021-12-02 20:21:46 浏览：756 订阅该版

RTT_逍遥 认证专家 2021-12-02

https://github.com/supperthomas

chenyingchun 2021-12-18

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recan 认证专家 2021-12-02

【架构师李肯】 http://yyds.recan-li.cn 【一个专注于嵌入式软件架构设计的新生代农名工】

你这么一说，我们现在在用的Alios Things封装的`hal/i2c`也有类似的问题：
接口里面的dev_addr和配置结构体里面的dev_addr，只用其一。
```c
/* This struct define i2c config args */
typedef struct {
    uint32_t address_width; /**< Addressing mode: 7 bit or 10 bit */
    uint32_t freq;          /**< CLK freq */
    uint8_t  mode;          /**< master or slave mode */
    uint16_t dev_addr;      /**< slave device addr */
} i2c_config_t;

/* This struct define i2c main handle */
typedef struct {
    uint8_t       port;   /**< i2c port */
    i2c_config_t  config; /**< i2c config */
    void         *priv;   /**< priv data */
    int           sda_pin;
    int           scl_pin;
} i2c_dev_t;

/**
 * I2c master send
 *
 * @param[in]  i2c       the i2c device
 * @param[in]  dev_addr  device address
 * @param[in]  data      i2c send data
 * @param[in]  size      i2c send data size
 * @param[in]  timeout   timeout in milisecond, set this value to HAL_WAIT_FOREVER
 *                       if you want to wait forever
 *
 * @return  0 : on success,  otherwise is error
 */
int32_t hal_i2c_master_send(i2c_dev_t *i2c, uint16_t dev_addr, const uint8_t *data,
                            uint16_t size, uint32_t timeout);

/**
 * I2c master recv
 *
 * @param[in]   i2c       the i2c device
 * @param[in]   dev_addr  device address
 * @param[out]  data      i2c receive data
 * @param[in]   size      i2c receive data size
 * @param[in]   timeout   timeout in milisecond, set this value to HAL_WAIT_FOREVER
 *                        if you want to wait forever
 *
 * @return  0 : on success,  otherwise is error
 */
int32_t hal_i2c_master_recv(i2c_dev_t *i2c, uint16_t dev_addr, uint8_t *data,
                            uint16_t size, uint32_t timeout);
```