#ifndef __MODBUS_SLAVE_H
#define __MODBUS_SLAVE_H

#include "stm32g4xx_hal.h"
#include <stdint.h>
#include <stdbool.h>
#include "com.h"

/* Modbus 相关参数 */
#define MODBUS_SLAVE_ADDRESS      0x34
#define MODBUS_FUNCTION_CODE_03   0x03
#define MODBUS_FUNCTION_CODE_06   0x06
#define MODBUS_FUNCTION_CODE_10   0x10
#define MODBUS_BUFFER_SIZE        256
#define MODBUS_TIMEOUT_MS         2
#define MODBUS_CRC_OFF            0   /* ==1 关闭CRC校验 */

/* 寄存器相关参数 */
#define REGISTER_START_ADDRESS    0x0000
#define REGISTER_COUNT            12

/* 全局变量声明 */
extern uint16_t holdingRegisters[REGISTER_COUNT];
extern uint8_t RS485_1_RX;
extern uint8_t RS485_1_Host_Existed;
extern char dmk_read_state;

/* TComCtrl 回调 — 注册到 RS485_1，由 rd_ComRead 自动调用 */
int Modbus_Slave_Check(char *_pBuffer, uint32_t _iSize);
void Modbus_Slave_Decode(const char *_pBuffer, uint32_t _iSize);

/* Modbus 主机接口 */
void Modbus_Master_Init(TComCtrl *ptRS485);
void MB_WriteHoldingReg(uint8_t _addr, uint16_t _reg, uint16_t _data);
void calculate_dmk(void);

/* CRC 计算 */
uint16_t CalculateCRC(uint8_t *data, uint8_t length);

#endif /* __MODBUS_SLAVE_H */