/*****************************************************************************
*
* File              : modbus.h
* Compiler          : IAR C 5.10C Kickstart
* Revision          : $Revision: 1.0 $
* Date              : $Date: 2008 / 12 / 09
* Updated by        : $Author: Jongkwang Woo
*
* Support mail      : spirit0305@naver.com
*
* Description       : Header file for modbus.c
*
****************************************************************************/

#ifndef _MODBUS_H_
#define _MODBUS_H_

#include <stm32f4xx.h>

// Function Code Define 
#define READ_COIL_STATUS        0x01
#define READ_HOLDING_REG        0x03
#define FORCE_SINGLE_COIL       0x05
#define PRESET_SINGLE_REG       0x06
#define PRESET_MULTI_REG        0x10

typedef struct 
{
	u8 device_addr;
	u8 function_code;
	u16 start_addr;
	u16 number_of_data;
	u8 crch;
	u8 crcl;
} TModBusReadRegisterReq, *PModBusReadRegisterReq;

void GetCRC(u8 *pby, u16 nSize, u8 *byFirstReturn, u8 *bySecondReturn);
u8 ModBusPacketCheck(u8* rdata, u16 len, u8 addr);

void read_coil_process(u16 addr, u16 qty);
void write_single_coils_process(u16 addr, u16 qty);
void read_holding_reg_process(u16 addr, u16 qty);
void key_pads_process(u16 addr, u16 qty);

s16 GetRegister(u16 reg_addr);
s16 SetRegister(u16 reg_addr, s16 reg_value);

u8* ModBusReadRegister(u8 *rdata, u16 len, u16 *wlen);
u8* ModBusWriteRegister(u8 *rdata, u16 len, u16 *wlen);

void WordToByte(s16 data, u8 *bytes, u8 opt);
s16 ByteToWord(u8 *bytes, u8 opt);

#endif