/*
 * modbus.c
 *
 *  Created on: Nov 9, 2024
 *      Author: lubi
 */
#include "modbus.h"
#include "main.h"
#include "usart.h"
#include "can_comm.h"


/* Static Data Declarations */
union
{
	unsigned short int word;
	uint32_t dword;
	float dfloat;
	unsigned char byte[4];
}split_int;

unsigned short int crc_gen;
uint8_t rxmsg[12];

//Extern variables
extern volatile char update_modbus;


unsigned short int CRC16 (unsigned char *nData, unsigned short int wLength)
{
	static const unsigned short int wCRCTable[] = {
	0X0000, 0XC0C1, 0XC181, 0X0140, 0XC301, 0X03C0, 0X0280, 0XC241,
	0XC601, 0X06C0, 0X0780, 0XC741, 0X0500, 0XC5C1, 0XC481, 0X0440,
	0XCC01, 0X0CC0, 0X0D80, 0XCD41, 0X0F00, 0XCFC1, 0XCE81, 0X0E40,
	0X0A00, 0XCAC1, 0XCB81, 0X0B40, 0XC901, 0X09C0, 0X0880, 0XC841,
	0XD801, 0X18C0, 0X1980, 0XD941, 0X1B00, 0XDBC1, 0XDA81, 0X1A40,
	0X1E00, 0XDEC1, 0XDF81, 0X1F40, 0XDD01, 0X1DC0, 0X1C80, 0XDC41,
	0X1400, 0XD4C1, 0XD581, 0X1540, 0XD701, 0X17C0, 0X1680, 0XD641,
	0XD201, 0X12C0, 0X1380, 0XD341, 0X1100, 0XD1C1, 0XD081, 0X1040,
	0XF001, 0X30C0, 0X3180, 0XF141, 0X3300, 0XF3C1, 0XF281, 0X3240,
	0X3600, 0XF6C1, 0XF781, 0X3740, 0XF501, 0X35C0, 0X3480, 0XF441,
	0X3C00, 0XFCC1, 0XFD81, 0X3D40, 0XFF01, 0X3FC0, 0X3E80, 0XFE41,
	0XFA01, 0X3AC0, 0X3B80, 0XFB41, 0X3900, 0XF9C1, 0XF881, 0X3840,
	0X2800, 0XE8C1, 0XE981, 0X2940, 0XEB01, 0X2BC0, 0X2A80, 0XEA41,
	0XEE01, 0X2EC0, 0X2F80, 0XEF41, 0X2D00, 0XEDC1, 0XEC81, 0X2C40,
	0XE401, 0X24C0, 0X2580, 0XE541, 0X2700, 0XE7C1, 0XE681, 0X2640,
	0X2200, 0XE2C1, 0XE381, 0X2340, 0XE101, 0X21C0, 0X2080, 0XE041,
	0XA001, 0X60C0, 0X6180, 0XA141, 0X6300, 0XA3C1, 0XA281, 0X6240,
	0X6600, 0XA6C1, 0XA781, 0X6740, 0XA501, 0X65C0, 0X6480, 0XA441,
	0X6C00, 0XACC1, 0XAD81, 0X6D40, 0XAF01, 0X6FC0, 0X6E80, 0XAE41,
	0XAA01, 0X6AC0, 0X6B80, 0XAB41, 0X6900, 0XA9C1, 0XA881, 0X6840,
	0X7800, 0XB8C1, 0XB981, 0X7940, 0XBB01, 0X7BC0, 0X7A80, 0XBA41,
	0XBE01, 0X7EC0, 0X7F80, 0XBF41, 0X7D00, 0XBDC1, 0XBC81, 0X7C40,
	0XB401, 0X74C0, 0X7580, 0XB541, 0X7700, 0XB7C1, 0XB681, 0X7640,
	0X7200, 0XB2C1, 0XB381, 0X7340, 0XB101, 0X71C0, 0X7080, 0XB041,
	0X5000, 0X90C1, 0X9181, 0X5140, 0X9301, 0X53C0, 0X5280, 0X9241,
	0X9601, 0X56C0, 0X5780, 0X9741, 0X5500, 0X95C1, 0X9481, 0X5440,
	0X9C01, 0X5CC0, 0X5D80, 0X9D41, 0X5F00, 0X9FC1, 0X9E81, 0X5E40,
	0X5A00, 0X9AC1, 0X9B81, 0X5B40, 0X9901, 0X59C0, 0X5880, 0X9841,
	0X8801, 0X48C0, 0X4980, 0X8941, 0X4B00, 0X8BC1, 0X8A81, 0X4A40,
	0X4E00, 0X8EC1, 0X8F81, 0X4F40, 0X8D01, 0X4DC0, 0X4C80, 0X8C41,
	0X4400, 0X84C1, 0X8581, 0X4540, 0X8701, 0X47C0, 0X4680, 0X8641,
	0X8201, 0X42C0, 0X4380, 0X8341, 0X4100, 0X81C1, 0X8081, 0X4040 };

	unsigned char nTemp;
	unsigned short int wCRCWord = 0xFFFF;

	while (wLength--)
	{
	  nTemp = *nData++ ^ wCRCWord;
	  wCRCWord >>= 8;
	  wCRCWord ^= wCRCTable[nTemp];
	}
	return wCRCWord;
}
void modbus_check(void)
{
	uint8_t gun_conn = rxmsg[0];

	//TODO CRC generation
//	crc_gen = CRC16(rxmsg, sizeof(rxmsg) - 2);

	if(gun_conn == 0x01)
	{
		split_int.byte[1] = rxmsg[3];
		split_int.byte[0] = rxmsg[4];
		HVposRes = split_int.dword;

		split_int.byte[1] = rxmsg[5];
		split_int.byte[0] = rxmsg[6];
		HVposRes_1= split_int.dword;
	}
	else if(gun_conn == 0x02)
	{
		split_int.byte[1] = rxmsg[3];
		split_int.byte[0] = rxmsg[4];
		HVnegRes = split_int.dword;


		if(HVposRes >= HVnegRes)
		{
			can2TX_msg[can2TX_ele_isolationMSB] = HVnegRes/256; //send gun1 DC- isolation
			can2TX_msg[can2TX_ele_isolationLSB] = HVnegRes%256;//send gun1 DC- isolation
		}
		else
		{
			can2TX_msg[can2TX_ele_isolationMSB] = HVposRes/256; //send gun1 DC+ isolation
			can2TX_msg[can2TX_ele_isolationLSB] = HVposRes%256; //send gun1 DC+ isolation
		}

		split_int.byte[1] = rxmsg[5];
		split_int.byte[0] = rxmsg[6];
		HVnegRes_1= split_int.dword;


		if(HVposRes_1 >= HVnegRes_1)
		{
			can2TX_msg[can2TX_ele_isolationMSB_IMD2] = HVnegRes_1/256; //send gun2 DC- isolation
			can2TX_msg[can2TX_ele_isolationLSB_IMD2] = HVnegRes_1%256; //send gun2 DC- isolation
		}
		else
		{
			can2TX_msg[can2TX_ele_isolationMSB_IMD2] = HVposRes_1/256; //send gun2 DC+ isolation
			can2TX_msg[can2TX_ele_isolationLSB_IMD2] = HVposRes_1%256; //send gun2 DC+ isolation
		}
	}

	update_modbus = 0;

}
