请教GET_PIN问题

发布于 2020-06-18 17:59:20 浏览：2698 订阅该版

```c
/*-------------------------- I2C CONFIG BEGIN --------------------------*/

/** if you want to use i2c bus(soft simulate) you can use the following instructions.
 *
 * STEP 1, open i2c driver framework(soft simulate) support in the RT-Thread Settings file
 *
 * STEP 2, define macro related to the i2c bus
 *                 such as     #define BSP_USING_I2C1
 *
 * STEP 3, according to the corresponding pin of i2c port, modify the related i2c port and pin information
 *                 such as     #define BSP_I2C1_SCL_PIN    GET_PIN(port, pin)   ->   GET_PIN(C, 11)
 *                             #define BSP_I2C1_SDA_PIN    GET_PIN(port, pin)   ->   GET_PIN(C, 12)
 */

#define BSP_USING_I2C1
#ifdef BSP_USING_I2C1
#define BSP_I2C1_SCL_PIN    GET_PIN(B, 8)
#define BSP_I2C1_SDA_PIN    GET_PIN(B, 9)
#endif

/*#define BSP_USING_I2C2*/
#ifdef BSP_USING_I2C2
#define BSP_I2C2_SCL_PIN    GET_PIN(port, pin)
#define BSP_I2C2_SDA_PIN    GET_PIN(port, pin)
#endif

/*-------------------------- I2C CONFIG END --------------------------*/
```
编译时出现下面的问题
``` 
'B' undeclared here (not in a function)
```

- RT-Thread Studio V1.1.0
- RT-Thread 4.0.2

[https://www.rt-thread.org/document/site/rtthread-studio/drivers/soft-i2c/rtthread-studio-soft-i2c/](https://www.rt-thread.org/document/site/rtthread-studio/drivers/soft-i2c/rtthread-studio-soft-i2c/) 中也这同样定义啊

请教一下如何解决这个问题？