#ifndef _MODBUS_H
#define _MODBUS_H

#include <stdint.h>

#define SLAVE_ID_DEFAULT        (1u)
#define MODBUS_SLAVE_ID		    0
#define MODBUS_FUN_CODE			1
#define MODBUS_START_ADDR_H     2
#define MODBUS_START_ADDR_L     3
#define MODBUS_SIZE_H		    4
#define MODBUS_SIZE_L		    5

#define MODBUS_06_VAL_H			4
#define MODBUS_06_VAL_L			5


typedef enum {
	MODBUS_STATUS_OK,
	MODBUS_STATUS_ERR
} ModbusStatus_t;


ModbusStatus_t modbus_process(const uint8_t * buffer_cmd, uint8_t recv_len, uint8_t * buffer_resp, uint8_t * resp_len);



typedef struct {
    uint8_t slaveAddr;
    uint8_t funCode;
    uint16_t startAddr;
    uint16_t num;
    uint16_t crc;
} ModbusFrameCmd03_t;

typedef struct {
    uint8_t slaveAddr;
    uint8_t funCode;
    uint8_t byteNum;
    uint16_t data[125];
    uint16_t crc;
} ModbusFrameRes03_t;

/* 06功能码命令和响应格式一样 */
typedef struct {
    uint8_t slaveAddr;
    uint8_t funCode;
    uint16_t regAddr;
    uint16_t regValue;
    uint16_t crc;
} ModbusFrameCmdRes06_t;

typedef struct {
    
} ModbusFrameCmd0A_t;

typedef struct {
    
} ModbusFrameRes0A_t;

#endif