## b_mod_modbus

### 数据结构

```C
//这部分代码主要是提供RTU模式的主机读写功能
//从机返回读数据结果的数据结构
typedef struct
{
    uint8_t   func;
    uint8_t   reg_num;
    uint16_t *reg_value;
} bMB_ReadResult_t;
//从机返回写数据结果的数据结构
typedef struct
{
    uint8_t  func;
    uint16_t reg;
    uint16_t reg_num;
} bMB_WriteResult_t;
//传入回调函数的数据结构
typedef struct
{
    uint8_t type;  // 0: read     1:write
    union
    {
        bMB_ReadResult_t  r_result;
        bMB_WriteResult_t w_result;
    } result;
} bMB_SlaveDeviceData_t;

typedef void (*pMB_Send_t)(uint8_t *pbuf, uint16_t len);
typedef void (*pMB_Callback_t)(bMB_SlaveDeviceData_t *pdata);
//指定发送函数和回调函数
typedef struct
{
    pMB_Send_t     f;
    pMB_Callback_t cb;
} bMB_Info_t;

typedef bMB_Info_t bModbusInstance_t;

//可以通过这个宏快速创建实例，创建实例的时候指定发送和回调函数
#define bMODBUS_INSTANCE(name, pSendData, pCallback) \
    bModbusInstance_t name = {.f = pSendData, .cb = pCallback};

```

### 接口介绍

```C
//读取寄存器的值
int bMB_ReadRegs(bModbusInstance_t *pModbusInstance, uint8_t addr, uint8_t func, uint16_t reg,uint16_t num);
//写寄存器的值
int bMB_WriteRegs(bModbusInstance_t *pModbusInstance, uint8_t addr, uint8_t func, uint16_t reg, uint16_t num, uint16_t *reg_value);
//将接收到的数据喂给模块，让模块进行解析。解析正确后执行回调
int bMB_FeedReceivedData(bModbusInstance_t *pModbusInstance, uint8_t *pbuf, uint16_t len);
```

### 使用例子

```C
//...待添加
```