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modbus_slave.c
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modbus_slave.c
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/*
* modbas_slave.c
*
* Created on: 03/05/2017
* Author: andru
*/
#include <stdio.h>
#include <string.h>
/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"
#include "mbutils.h"
#include "modbus_slave.h"
static const uint16_t mb_bitrates[] = {2400, 4800, 9600, 19200, 38400};
/*------------------------Slave mode use these variables----------------------*/
//Slave mode:DiscreteInputs variables
USHORT usSDiscInStart = S_DISCRETE_INPUT_START;
#if S_DISCRETE_INPUT_NDISCRETES%8
UCHAR ucSDiscInBuf[S_DISCRETE_INPUT_NDISCRETES/8+1];
#else
UCHAR ucSDiscInBuf[S_DISCRETE_INPUT_NDISCRETES/8] ;
#endif
//Slave mode:Coils variables
USHORT usSCoilStart = S_COIL_START;
#if S_COIL_NCOILS%8
UCHAR ucSCoilBuf[S_COIL_NCOILS/8+1] ;
#else
UCHAR ucSCoilBuf[S_COIL_NCOILS/8] ;
#endif
//Slave mode:InputRegister variables
USHORT usSRegInStart = S_REG_INPUT_START;
SHORT usSRegInBuf[S_REG_INPUT_NREGS] ;
//Slave mode:HoldingRegister variables
USHORT usSRegHoldStart = S_REG_HOLDING_START;
SHORT usSRegHoldBuf[S_REG_HOLDING_NREGS] ;
BOOL initModbus (UCHAR addr, mb_bitrate_t bitrate, mb_parity_t parity) {
eMBErrorCode eStatus;
eStatus = eMBInit(MB_MODE, addr, MB_PORT, mb_bitrates[bitrate], parity);
if (eStatus != MB_ENOERR) {
return FALSE;
}
eStatus = eMBEnable();
if (eStatus != MB_ENOERR) {
return FALSE;
}
return TRUE;
}
/**
* Modbus slave discrete callback function.
*
* @param pucRegBuffer discrete buffer
* @param usAddress discrete address
* @param usNDiscrete discrete number
*
* @return result
*/
eMBErrorCode eMBRegDiscreteCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNDiscrete )
{
eMBErrorCode eStatus = MB_ENOERR;
USHORT iRegIndex , iRegBitIndex , iNReg;
iNReg = usNDiscrete / 8 + 1;
/* it already plus one in modbus function method. */
usAddress--;
if ((usAddress >= S_DISCRETE_INPUT_START)
&& (usAddress + usNDiscrete <= S_DISCRETE_INPUT_START + S_DISCRETE_INPUT_NDISCRETES))
{
iRegIndex = (USHORT) (usAddress - S_DISCRETE_INPUT_START) / 8;
iRegBitIndex = (USHORT) (usAddress - S_DISCRETE_INPUT_START) % 8;
while (iNReg > 0)
{
*pucRegBuffer++ = xMBUtilGetBits(&ucSDiscInBuf[iRegIndex++], iRegBitIndex, 8);
iNReg--;
}
pucRegBuffer--;
/* last discrete */
usNDiscrete = usNDiscrete % 8;
/* filling zero to high bit */
*pucRegBuffer = *pucRegBuffer << (8 - usNDiscrete);
*pucRegBuffer = *pucRegBuffer >> (8 - usNDiscrete);
}
else
{
eStatus = MB_ENOREG;
}
return eStatus;
}
/**
* Modbus slave coils callback function.
*
* @param pucRegBuffer coils buffer
* @param usAddress coils address
* @param usNCoils coils number
* @param eMode read or write
*
* @return result
*/
eMBErrorCode eMBRegCoilsCB(UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNCoils, eMBRegisterMode eMode)
{
eMBErrorCode eStatus = MB_ENOERR;
USHORT iRegIndex , iRegBitIndex , iNReg;
iNReg = usNCoils / 8 + 1;
/* it already plus one in modbus function method. */
usAddress--;
if( ( usAddress >= S_COIL_START ) &&
( usAddress + usNCoils <= S_COIL_START + S_COIL_NCOILS ) )
{
iRegIndex = (USHORT) (usAddress - S_COIL_START) / 8;
iRegBitIndex = (USHORT) (usAddress - S_COIL_START) % 8;
switch ( eMode )
{
/* read current coil values from the protocol stack. */
case MB_REG_READ:
while (iNReg > 0)
{
*pucRegBuffer++ = xMBUtilGetBits(&ucSCoilBuf[iRegIndex++], iRegBitIndex, 8);
iNReg--;
}
pucRegBuffer--;
/* last coils */
usNCoils = usNCoils % 8;
/* filling zero to high bit */
*pucRegBuffer = *pucRegBuffer << (8 - usNCoils);
*pucRegBuffer = *pucRegBuffer >> (8 - usNCoils);
break;
/* write current coil values with new values from the protocol stack. */
case MB_REG_WRITE:
while (iNReg > 1)
{
xMBUtilSetBits(&ucSCoilBuf[iRegIndex++], iRegBitIndex, 8, *pucRegBuffer++);
iNReg--;
}
/* last coils */
usNCoils = usNCoils % 8;
/* xMBUtilSetBits has bug when ucNBits is zero */
if (usNCoils != 0)
{
xMBUtilSetBits(&ucSCoilBuf[iRegIndex++], iRegBitIndex, usNCoils, *pucRegBuffer++);
}
#if 0 // TODO: implementation
#endif
break;
}
}
else
{
eStatus = MB_ENOREG;
}
return eStatus;
}
/**
* Modbus slave input register callback function.
*
* @param pucRegBuffer input register buffer
* @param usAddress input register address
* @param usNRegs input register number
*
* @return result
*/
eMBErrorCode eMBRegInputCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNRegs )
{
eMBErrorCode eStatus = MB_ENOERR;
USHORT iRegIndex;
/* it already plus one in modbus function method. */
usAddress--;
if( ( usAddress >= S_REG_INPUT_START )
&& ( usAddress + usNRegs <= S_REG_INPUT_START + S_REG_INPUT_NREGS ) )
{
iRegIndex = ( USHORT )( usAddress - usSRegInStart );
while( usNRegs > 0 )
{
*pucRegBuffer++ = (UCHAR)( usSRegInBuf[iRegIndex] >> 8 );
*pucRegBuffer++ = (UCHAR)( usSRegInBuf[iRegIndex] & 0xFF );
iRegIndex++;
usNRegs--;
}
}
else
{
eStatus = MB_ENOREG;
}
return eStatus;
}
/**
* Modbus slave holding register callback function.
*
* @param pucRegBuffer holding register buffer
* @param usAddress holding register address
* @param usNRegs holding register number
* @param eMode read or write
*
* @return result
*/
eMBErrorCode eMBRegHoldingCB(UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNRegs, eMBRegisterMode eMode)
{
eMBErrorCode eStatus = MB_ENOERR;
USHORT iRegIndex;
/* it already plus one in modbus function method. */
usAddress--;
if ((usAddress >= S_REG_HOLDING_START)
&& (usAddress + usNRegs <= S_REG_HOLDING_START + S_REG_HOLDING_NREGS))
{
iRegIndex = usAddress - usSRegHoldStart;
switch (eMode)
{
/* read current register values from the protocol stack. */
case MB_REG_READ:
while (usNRegs > 0)
{
*pucRegBuffer++ = (UCHAR)( usSRegHoldBuf[iRegIndex] >> 8 );
*pucRegBuffer++ = (UCHAR)( usSRegHoldBuf[iRegIndex] & 0xFF );
iRegIndex++;
usNRegs--;
}
break;
/* write current register values with new values from the protocol stack. */
case MB_REG_WRITE:
while (usNRegs > 0)
{
usSRegHoldBuf[iRegIndex] = *pucRegBuffer++ << 8;
usSRegHoldBuf[iRegIndex] |= *pucRegBuffer++;
iRegIndex++;
usNRegs--;
}
#if 0 // TODO: implementation
#endif
break;
}
}
else
{
eStatus = MB_ENOREG;
}
return eStatus;
}