diff options
Diffstat (limited to 'apps/modbus/functions')
| -rw-r--r-- | apps/modbus/functions/mbfunccoils.c | 270 | ||||
| -rw-r--r-- | apps/modbus/functions/mbfuncdiag.c | 29 | ||||
| -rw-r--r-- | apps/modbus/functions/mbfuncdisc.c | 125 | ||||
| -rw-r--r-- | apps/modbus/functions/mbfuncholding.c | 308 | ||||
| -rw-r--r-- | apps/modbus/functions/mbfuncinput.c | 122 | ||||
| -rw-r--r-- | apps/modbus/functions/mbfuncother.c | 88 | ||||
| -rw-r--r-- | apps/modbus/functions/mbutils.c | 141 |
7 files changed, 1083 insertions, 0 deletions
diff --git a/apps/modbus/functions/mbfunccoils.c b/apps/modbus/functions/mbfunccoils.c new file mode 100644 index 000000000..54227b335 --- /dev/null +++ b/apps/modbus/functions/mbfunccoils.c @@ -0,0 +1,270 @@ +/* + * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU. + * Copyright (c) 2006 Christian Walter <wolti@sil.at> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * File: $Id: mbfunccoils.c,v 1.8 2007/02/18 23:47:16 wolti Exp $ + */ + +/* ----------------------- System includes ----------------------------------*/ +#include "stdlib.h" +#include "string.h" + +/* ----------------------- Platform includes --------------------------------*/ +#include "port.h" + +/* ----------------------- Modbus includes ----------------------------------*/ +#include "mb.h" +#include "mbframe.h" +#include "mbproto.h" +#include "mbconfig.h" + +/* ----------------------- Defines ------------------------------------------*/ +#define MB_PDU_FUNC_READ_ADDR_OFF ( MB_PDU_DATA_OFF ) +#define MB_PDU_FUNC_READ_COILCNT_OFF ( MB_PDU_DATA_OFF + 2 ) +#define MB_PDU_FUNC_READ_SIZE ( 4 ) +#define MB_PDU_FUNC_READ_COILCNT_MAX ( 0x07D0 ) + +#define MB_PDU_FUNC_WRITE_ADDR_OFF ( MB_PDU_DATA_OFF ) +#define MB_PDU_FUNC_WRITE_VALUE_OFF ( MB_PDU_DATA_OFF + 2 ) +#define MB_PDU_FUNC_WRITE_SIZE ( 4 ) + +#define MB_PDU_FUNC_WRITE_MUL_ADDR_OFF ( MB_PDU_DATA_OFF ) +#define MB_PDU_FUNC_WRITE_MUL_COILCNT_OFF ( MB_PDU_DATA_OFF + 2 ) +#define MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF ( MB_PDU_DATA_OFF + 4 ) +#define MB_PDU_FUNC_WRITE_MUL_VALUES_OFF ( MB_PDU_DATA_OFF + 5 ) +#define MB_PDU_FUNC_WRITE_MUL_SIZE_MIN ( 5 ) +#define MB_PDU_FUNC_WRITE_MUL_COILCNT_MAX ( 0x07B0 ) + +/* ----------------------- Static functions ---------------------------------*/ +eMBException prveMBError2Exception( eMBErrorCode eErrorCode ); + +/* ----------------------- Start implementation -----------------------------*/ + +#if MB_FUNC_READ_COILS_ENABLED > 0 + +eMBException +eMBFuncReadCoils( UCHAR * pucFrame, USHORT * usLen ) +{ + USHORT usRegAddress; + USHORT usCoilCount; + UCHAR ucNBytes; + UCHAR *pucFrameCur; + + eMBException eStatus = MB_EX_NONE; + eMBErrorCode eRegStatus; + + if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) ) + { + usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 ); + usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] ); + usRegAddress++; + + usCoilCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_COILCNT_OFF] << 8 ); + usCoilCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_COILCNT_OFF + 1] ); + + /* Check if the number of registers to read is valid. If not + * return Modbus illegal data value exception. + */ + if( ( usCoilCount >= 1 ) && + ( usCoilCount < MB_PDU_FUNC_READ_COILCNT_MAX ) ) + { + /* Set the current PDU data pointer to the beginning. */ + pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF]; + *usLen = MB_PDU_FUNC_OFF; + + /* First byte contains the function code. */ + *pucFrameCur++ = MB_FUNC_READ_COILS; + *usLen += 1; + + /* Test if the quantity of coils is a multiple of 8. If not last + * byte is only partially field with unused coils set to zero. */ + if( ( usCoilCount & 0x0007 ) != 0 ) + { + ucNBytes = ( UCHAR )( usCoilCount / 8 + 1 ); + } + else + { + ucNBytes = ( UCHAR )( usCoilCount / 8 ); + } + *pucFrameCur++ = ucNBytes; + *usLen += 1; + + eRegStatus = + eMBRegCoilsCB( pucFrameCur, usRegAddress, usCoilCount, + MB_REG_READ ); + + /* If an error occured convert it into a Modbus exception. */ + if( eRegStatus != MB_ENOERR ) + { + eStatus = prveMBError2Exception( eRegStatus ); + } + else + { + /* The response contains the function code, the starting address + * and the quantity of registers. We reuse the old values in the + * buffer because they are still valid. */ + *usLen += ucNBytes;; + } + } + else + { + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + } + else + { + /* Can't be a valid read coil register request because the length + * is incorrect. */ + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + return eStatus; +} + +#if MB_FUNC_WRITE_COIL_ENABLED > 0 +eMBException +eMBFuncWriteCoil( UCHAR * pucFrame, USHORT * usLen ) +{ + USHORT usRegAddress; + UCHAR ucBuf[2]; + + eMBException eStatus = MB_EX_NONE; + eMBErrorCode eRegStatus; + + if( *usLen == ( MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN ) ) + { + usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF] << 8 ); + usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF + 1] ); + usRegAddress++; + + if( ( pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF + 1] == 0x00 ) && + ( ( pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF] == 0xFF ) || + ( pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF] == 0x00 ) ) ) + { + ucBuf[1] = 0; + if( pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF] == 0xFF ) + { + ucBuf[0] = 1; + } + else + { + ucBuf[0] = 0; + } + eRegStatus = + eMBRegCoilsCB( &ucBuf[0], usRegAddress, 1, MB_REG_WRITE ); + + /* If an error occured convert it into a Modbus exception. */ + if( eRegStatus != MB_ENOERR ) + { + eStatus = prveMBError2Exception( eRegStatus ); + } + } + else + { + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + } + else + { + /* Can't be a valid write coil register request because the length + * is incorrect. */ + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + return eStatus; +} + +#endif + +#if MB_FUNC_WRITE_MULTIPLE_COILS_ENABLED > 0 +eMBException +eMBFuncWriteMultipleCoils( UCHAR * pucFrame, USHORT * usLen ) +{ + USHORT usRegAddress; + USHORT usCoilCnt; + UCHAR ucByteCount; + UCHAR ucByteCountVerify; + + eMBException eStatus = MB_EX_NONE; + eMBErrorCode eRegStatus; + + if( *usLen > ( MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN ) ) + { + usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF] << 8 ); + usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF + 1] ); + usRegAddress++; + + usCoilCnt = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_COILCNT_OFF] << 8 ); + usCoilCnt |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_COILCNT_OFF + 1] ); + + ucByteCount = pucFrame[MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF]; + + /* Compute the number of expected bytes in the request. */ + if( ( usCoilCnt & 0x0007 ) != 0 ) + { + ucByteCountVerify = ( UCHAR )( usCoilCnt / 8 + 1 ); + } + else + { + ucByteCountVerify = ( UCHAR )( usCoilCnt / 8 ); + } + + if( ( usCoilCnt >= 1 ) && + ( usCoilCnt <= MB_PDU_FUNC_WRITE_MUL_COILCNT_MAX ) && + ( ucByteCountVerify == ucByteCount ) ) + { + eRegStatus = + eMBRegCoilsCB( &pucFrame[MB_PDU_FUNC_WRITE_MUL_VALUES_OFF], + usRegAddress, usCoilCnt, MB_REG_WRITE ); + + /* If an error occured convert it into a Modbus exception. */ + if( eRegStatus != MB_ENOERR ) + { + eStatus = prveMBError2Exception( eRegStatus ); + } + else + { + /* The response contains the function code, the starting address + * and the quantity of registers. We reuse the old values in the + * buffer because they are still valid. */ + *usLen = MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF; + } + } + else + { + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + } + else + { + /* Can't be a valid write coil register request because the length + * is incorrect. */ + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + return eStatus; +} + +#endif + +#endif diff --git a/apps/modbus/functions/mbfuncdiag.c b/apps/modbus/functions/mbfuncdiag.c new file mode 100644 index 000000000..d75ffc0f7 --- /dev/null +++ b/apps/modbus/functions/mbfuncdiag.c @@ -0,0 +1,29 @@ +/* + * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU. + * Copyright (c) 2006 Christian Walter <wolti@sil.at> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * File: $Id: mbfuncdiag.c,v 1.3 2006/12/07 22:10:34 wolti Exp $ + */ diff --git a/apps/modbus/functions/mbfuncdisc.c b/apps/modbus/functions/mbfuncdisc.c new file mode 100644 index 000000000..fb378441b --- /dev/null +++ b/apps/modbus/functions/mbfuncdisc.c @@ -0,0 +1,125 @@ + /* + * FreeRTOS Modbus Libary: A Modbus serial implementation for FreeRTOS + * Copyright (C) 2006 Christian Walter <wolti@sil.at> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + + + +/* ----------------------- System includes ----------------------------------*/ +#include "stdlib.h" +#include "string.h" + +/* ----------------------- Platform includes --------------------------------*/ +#include "port.h" + +/* ----------------------- Modbus includes ----------------------------------*/ +#include "mb.h" +#include "mbframe.h" +#include "mbproto.h" +#include "mbconfig.h" + +/* ----------------------- Defines ------------------------------------------*/ +#define MB_PDU_FUNC_READ_ADDR_OFF ( MB_PDU_DATA_OFF ) +#define MB_PDU_FUNC_READ_DISCCNT_OFF ( MB_PDU_DATA_OFF + 2 ) +#define MB_PDU_FUNC_READ_SIZE ( 4 ) +#define MB_PDU_FUNC_READ_DISCCNT_MAX ( 0x07D0 ) + +/* ----------------------- Static functions ---------------------------------*/ +eMBException prveMBError2Exception( eMBErrorCode eErrorCode ); + +/* ----------------------- Start implementation -----------------------------*/ + +#if MB_FUNC_READ_COILS_ENABLED > 0 + +eMBException +eMBFuncReadDiscreteInputs( UCHAR * pucFrame, USHORT * usLen ) +{ + USHORT usRegAddress; + USHORT usDiscreteCnt; + UCHAR ucNBytes; + UCHAR *pucFrameCur; + + eMBException eStatus = MB_EX_NONE; + eMBErrorCode eRegStatus; + + if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) ) + { + usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 ); + usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] ); + usRegAddress++; + + usDiscreteCnt = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_DISCCNT_OFF] << 8 ); + usDiscreteCnt |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_DISCCNT_OFF + 1] ); + + /* Check if the number of registers to read is valid. If not + * return Modbus illegal data value exception. + */ + if( ( usDiscreteCnt >= 1 ) && + ( usDiscreteCnt < MB_PDU_FUNC_READ_DISCCNT_MAX ) ) + { + /* Set the current PDU data pointer to the beginning. */ + pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF]; + *usLen = MB_PDU_FUNC_OFF; + + /* First byte contains the function code. */ + *pucFrameCur++ = MB_FUNC_READ_DISCRETE_INPUTS; + *usLen += 1; + + /* Test if the quantity of coils is a multiple of 8. If not last + * byte is only partially field with unused coils set to zero. */ + if( ( usDiscreteCnt & 0x0007 ) != 0 ) + { + ucNBytes = ( UCHAR ) ( usDiscreteCnt / 8 + 1 ); + } + else + { + ucNBytes = ( UCHAR ) ( usDiscreteCnt / 8 ); + } + *pucFrameCur++ = ucNBytes; + *usLen += 1; + + eRegStatus = + eMBRegDiscreteCB( pucFrameCur, usRegAddress, usDiscreteCnt ); + + /* If an error occured convert it into a Modbus exception. */ + if( eRegStatus != MB_ENOERR ) + { + eStatus = prveMBError2Exception( eRegStatus ); + } + else + { + /* The response contains the function code, the starting address + * and the quantity of registers. We reuse the old values in the + * buffer because they are still valid. */ + *usLen += ucNBytes;; + } + } + else + { + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + } + else + { + /* Can't be a valid read coil register request because the length + * is incorrect. */ + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + return eStatus; +} + +#endif diff --git a/apps/modbus/functions/mbfuncholding.c b/apps/modbus/functions/mbfuncholding.c new file mode 100644 index 000000000..e74a0624d --- /dev/null +++ b/apps/modbus/functions/mbfuncholding.c @@ -0,0 +1,308 @@ +/* + * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU. + * Copyright (c) 2006 Christian Walter <wolti@sil.at> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * File: $Id: mbfuncholding.c,v 1.12 2007/02/18 23:48:22 wolti Exp $ + */ + +/* ----------------------- System includes ----------------------------------*/ +#include "stdlib.h" +#include "string.h" + +/* ----------------------- Platform includes --------------------------------*/ +#include "port.h" + +/* ----------------------- Modbus includes ----------------------------------*/ +#include "mb.h" +#include "mbframe.h" +#include "mbproto.h" +#include "mbconfig.h" + +/* ----------------------- Defines ------------------------------------------*/ +#define MB_PDU_FUNC_READ_ADDR_OFF ( MB_PDU_DATA_OFF + 0) +#define MB_PDU_FUNC_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 ) +#define MB_PDU_FUNC_READ_SIZE ( 4 ) +#define MB_PDU_FUNC_READ_REGCNT_MAX ( 0x007D ) + +#define MB_PDU_FUNC_WRITE_ADDR_OFF ( MB_PDU_DATA_OFF + 0) +#define MB_PDU_FUNC_WRITE_VALUE_OFF ( MB_PDU_DATA_OFF + 2 ) +#define MB_PDU_FUNC_WRITE_SIZE ( 4 ) + +#define MB_PDU_FUNC_WRITE_MUL_ADDR_OFF ( MB_PDU_DATA_OFF + 0 ) +#define MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 ) +#define MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF ( MB_PDU_DATA_OFF + 4 ) +#define MB_PDU_FUNC_WRITE_MUL_VALUES_OFF ( MB_PDU_DATA_OFF + 5 ) +#define MB_PDU_FUNC_WRITE_MUL_SIZE_MIN ( 5 ) +#define MB_PDU_FUNC_WRITE_MUL_REGCNT_MAX ( 0x0078 ) + +#define MB_PDU_FUNC_READWRITE_READ_ADDR_OFF ( MB_PDU_DATA_OFF + 0 ) +#define MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 ) +#define MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF ( MB_PDU_DATA_OFF + 4 ) +#define MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF ( MB_PDU_DATA_OFF + 6 ) +#define MB_PDU_FUNC_READWRITE_BYTECNT_OFF ( MB_PDU_DATA_OFF + 8 ) +#define MB_PDU_FUNC_READWRITE_WRITE_VALUES_OFF ( MB_PDU_DATA_OFF + 9 ) +#define MB_PDU_FUNC_READWRITE_SIZE_MIN ( 9 ) + +/* ----------------------- Static functions ---------------------------------*/ +eMBException prveMBError2Exception( eMBErrorCode eErrorCode ); + +/* ----------------------- Start implementation -----------------------------*/ + +#if MB_FUNC_WRITE_HOLDING_ENABLED > 0 + +eMBException +eMBFuncWriteHoldingRegister( UCHAR * pucFrame, USHORT * usLen ) +{ + USHORT usRegAddress; + eMBException eStatus = MB_EX_NONE; + eMBErrorCode eRegStatus; + + if( *usLen == ( MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN ) ) + { + usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF] << 8 ); + usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF + 1] ); + usRegAddress++; + + /* Make callback to update the value. */ + eRegStatus = eMBRegHoldingCB( &pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF], + usRegAddress, 1, MB_REG_WRITE ); + + /* If an error occured convert it into a Modbus exception. */ + if( eRegStatus != MB_ENOERR ) + { + eStatus = prveMBError2Exception( eRegStatus ); + } + } + else + { + /* Can't be a valid request because the length is incorrect. */ + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + return eStatus; +} +#endif + +#if MB_FUNC_WRITE_MULTIPLE_HOLDING_ENABLED > 0 +eMBException +eMBFuncWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen ) +{ + USHORT usRegAddress; + USHORT usRegCount; + UCHAR ucRegByteCount; + + eMBException eStatus = MB_EX_NONE; + eMBErrorCode eRegStatus; + + if( *usLen >= ( MB_PDU_FUNC_WRITE_MUL_SIZE_MIN + MB_PDU_SIZE_MIN ) ) + { + usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF] << 8 ); + usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF + 1] ); + usRegAddress++; + + usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF] << 8 ); + usRegCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF + 1] ); + + ucRegByteCount = pucFrame[MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF]; + + if( ( usRegCount >= 1 ) && + ( usRegCount <= MB_PDU_FUNC_WRITE_MUL_REGCNT_MAX ) && + ( ucRegByteCount == ( UCHAR ) ( 2 * usRegCount ) ) ) + { + /* Make callback to update the register values. */ + eRegStatus = + eMBRegHoldingCB( &pucFrame[MB_PDU_FUNC_WRITE_MUL_VALUES_OFF], + usRegAddress, usRegCount, MB_REG_WRITE ); + + /* If an error occured convert it into a Modbus exception. */ + if( eRegStatus != MB_ENOERR ) + { + eStatus = prveMBError2Exception( eRegStatus ); + } + else + { + /* The response contains the function code, the starting + * address and the quantity of registers. We reuse the + * old values in the buffer because they are still valid. + */ + *usLen = MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF; + } + } + else + { + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + } + else + { + /* Can't be a valid request because the length is incorrect. */ + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + return eStatus; +} +#endif + +#if MB_FUNC_READ_HOLDING_ENABLED > 0 + +eMBException +eMBFuncReadHoldingRegister( UCHAR * pucFrame, USHORT * usLen ) +{ + USHORT usRegAddress; + USHORT usRegCount; + UCHAR *pucFrameCur; + + eMBException eStatus = MB_EX_NONE; + eMBErrorCode eRegStatus; + + if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) ) + { + usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 ); + usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] ); + usRegAddress++; + + usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF] << 8 ); + usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF + 1] ); + + /* Check if the number of registers to read is valid. If not + * return Modbus illegal data value exception. + */ + if( ( usRegCount >= 1 ) && ( usRegCount <= MB_PDU_FUNC_READ_REGCNT_MAX ) ) + { + /* Set the current PDU data pointer to the beginning. */ + pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF]; + *usLen = MB_PDU_FUNC_OFF; + + /* First byte contains the function code. */ + *pucFrameCur++ = MB_FUNC_READ_HOLDING_REGISTER; + *usLen += 1; + + /* Second byte in the response contain the number of bytes. */ + *pucFrameCur++ = ( UCHAR ) ( usRegCount * 2 ); + *usLen += 1; + + /* Make callback to fill the buffer. */ + eRegStatus = eMBRegHoldingCB( pucFrameCur, usRegAddress, usRegCount, MB_REG_READ ); + /* If an error occured convert it into a Modbus exception. */ + if( eRegStatus != MB_ENOERR ) + { + eStatus = prveMBError2Exception( eRegStatus ); + } + else + { + *usLen += usRegCount * 2; + } + } + else + { + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + } + else + { + /* Can't be a valid request because the length is incorrect. */ + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + return eStatus; +} + +#endif + +#if MB_FUNC_READWRITE_HOLDING_ENABLED > 0 + +eMBException +eMBFuncReadWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen ) +{ + USHORT usRegReadAddress; + USHORT usRegReadCount; + USHORT usRegWriteAddress; + USHORT usRegWriteCount; + UCHAR ucRegWriteByteCount; + UCHAR *pucFrameCur; + + eMBException eStatus = MB_EX_NONE; + eMBErrorCode eRegStatus; + + if( *usLen >= ( MB_PDU_FUNC_READWRITE_SIZE_MIN + MB_PDU_SIZE_MIN ) ) + { + usRegReadAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_ADDR_OFF] << 8U ); + usRegReadAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_ADDR_OFF + 1] ); + usRegReadAddress++; + + usRegReadCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF] << 8U ); + usRegReadCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF + 1] ); + + usRegWriteAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF] << 8U ); + usRegWriteAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF + 1] ); + usRegWriteAddress++; + + usRegWriteCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF] << 8U ); + usRegWriteCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF + 1] ); + + ucRegWriteByteCount = pucFrame[MB_PDU_FUNC_READWRITE_BYTECNT_OFF]; + + if( ( usRegReadCount >= 1 ) && ( usRegReadCount <= 0x7D ) && + ( usRegWriteCount >= 1 ) && ( usRegWriteCount <= 0x79 ) && + ( ( 2 * usRegWriteCount ) == ucRegWriteByteCount ) ) + { + /* Make callback to update the register values. */ + eRegStatus = eMBRegHoldingCB( &pucFrame[MB_PDU_FUNC_READWRITE_WRITE_VALUES_OFF], + usRegWriteAddress, usRegWriteCount, MB_REG_WRITE ); + + if( eRegStatus == MB_ENOERR ) + { + /* Set the current PDU data pointer to the beginning. */ + pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF]; + *usLen = MB_PDU_FUNC_OFF; + + /* First byte contains the function code. */ + *pucFrameCur++ = MB_FUNC_READWRITE_MULTIPLE_REGISTERS; + *usLen += 1; + + /* Second byte in the response contain the number of bytes. */ + *pucFrameCur++ = ( UCHAR ) ( usRegReadCount * 2 ); + *usLen += 1; + + /* Make the read callback. */ + eRegStatus = + eMBRegHoldingCB( pucFrameCur, usRegReadAddress, usRegReadCount, MB_REG_READ ); + if( eRegStatus == MB_ENOERR ) + { + *usLen += 2 * usRegReadCount; + } + } + if( eRegStatus != MB_ENOERR ) + { + eStatus = prveMBError2Exception( eRegStatus ); + } + } + else + { + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + } + return eStatus; +} + +#endif diff --git a/apps/modbus/functions/mbfuncinput.c b/apps/modbus/functions/mbfuncinput.c new file mode 100644 index 000000000..cceedbafe --- /dev/null +++ b/apps/modbus/functions/mbfuncinput.c @@ -0,0 +1,122 @@ +/* + * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU. + * Copyright (c) 2006 Christian Walter <wolti@sil.at> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * File: $Id: mbfuncinput.c,v 1.10 2007/09/12 10:15:56 wolti Exp $ + */ + +/* ----------------------- System includes ----------------------------------*/ +#include "stdlib.h" +#include "string.h" + +/* ----------------------- Platform includes --------------------------------*/ +#include "port.h" + +/* ----------------------- Modbus includes ----------------------------------*/ +#include "mb.h" +#include "mbframe.h" +#include "mbproto.h" +#include "mbconfig.h" + +/* ----------------------- Defines ------------------------------------------*/ +#define MB_PDU_FUNC_READ_ADDR_OFF ( MB_PDU_DATA_OFF ) +#define MB_PDU_FUNC_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 ) +#define MB_PDU_FUNC_READ_SIZE ( 4 ) +#define MB_PDU_FUNC_READ_REGCNT_MAX ( 0x007D ) + +#define MB_PDU_FUNC_READ_RSP_BYTECNT_OFF ( MB_PDU_DATA_OFF ) + +/* ----------------------- Static functions ---------------------------------*/ +eMBException prveMBError2Exception( eMBErrorCode eErrorCode ); + +/* ----------------------- Start implementation -----------------------------*/ +#if MB_FUNC_READ_INPUT_ENABLED > 0 + +eMBException +eMBFuncReadInputRegister( UCHAR * pucFrame, USHORT * usLen ) +{ + USHORT usRegAddress; + USHORT usRegCount; + UCHAR *pucFrameCur; + + eMBException eStatus = MB_EX_NONE; + eMBErrorCode eRegStatus; + + if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) ) + { + usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 ); + usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] ); + usRegAddress++; + + usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF] << 8 ); + usRegCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF + 1] ); + + /* Check if the number of registers to read is valid. If not + * return Modbus illegal data value exception. + */ + if( ( usRegCount >= 1 ) + && ( usRegCount < MB_PDU_FUNC_READ_REGCNT_MAX ) ) + { + /* Set the current PDU data pointer to the beginning. */ + pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF]; + *usLen = MB_PDU_FUNC_OFF; + + /* First byte contains the function code. */ + *pucFrameCur++ = MB_FUNC_READ_INPUT_REGISTER; + *usLen += 1; + + /* Second byte in the response contain the number of bytes. */ + *pucFrameCur++ = ( UCHAR )( usRegCount * 2 ); + *usLen += 1; + + eRegStatus = + eMBRegInputCB( pucFrameCur, usRegAddress, usRegCount ); + + /* If an error occured convert it into a Modbus exception. */ + if( eRegStatus != MB_ENOERR ) + { + eStatus = prveMBError2Exception( eRegStatus ); + } + else + { + *usLen += usRegCount * 2; + } + } + else + { + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + } + else + { + /* Can't be a valid read input register request because the length + * is incorrect. */ + eStatus = MB_EX_ILLEGAL_DATA_VALUE; + } + return eStatus; +} + +#endif diff --git a/apps/modbus/functions/mbfuncother.c b/apps/modbus/functions/mbfuncother.c new file mode 100644 index 000000000..fcee972bf --- /dev/null +++ b/apps/modbus/functions/mbfuncother.c @@ -0,0 +1,88 @@ +/* + * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU. + * Copyright (c) 2006 Christian Walter <wolti@sil.at> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * File: $Id: mbfuncother.c,v 1.8 2006/12/07 22:10:34 wolti Exp $ + */ + +/* ----------------------- System includes ----------------------------------*/ +#include "stdlib.h" +#include "string.h" + +/* ----------------------- Platform includes --------------------------------*/ +#include "port.h" + +/* ----------------------- Modbus includes ----------------------------------*/ +#include "mb.h" +#include "mbframe.h" +#include "mbproto.h" +#include "mbconfig.h" + +#if MB_FUNC_OTHER_REP_SLAVEID_ENABLED > 0 + +/* ----------------------- Static variables ---------------------------------*/ +static UCHAR ucMBSlaveID[MB_FUNC_OTHER_REP_SLAVEID_BUF]; +static USHORT usMBSlaveIDLen; + +/* ----------------------- Start implementation -----------------------------*/ + +eMBErrorCode +eMBSetSlaveID( UCHAR ucSlaveID, BOOL xIsRunning, + UCHAR const *pucAdditional, USHORT usAdditionalLen ) +{ + eMBErrorCode eStatus = MB_ENOERR; + + /* the first byte and second byte in the buffer is reserved for + * the parameter ucSlaveID and the running flag. The rest of + * the buffer is available for additional data. */ + if( usAdditionalLen + 2 < MB_FUNC_OTHER_REP_SLAVEID_BUF ) + { + usMBSlaveIDLen = 0; + ucMBSlaveID[usMBSlaveIDLen++] = ucSlaveID; + ucMBSlaveID[usMBSlaveIDLen++] = ( UCHAR )( xIsRunning ? 0xFF : 0x00 ); + if( usAdditionalLen > 0 ) + { + memcpy( &ucMBSlaveID[usMBSlaveIDLen], pucAdditional, + ( size_t )usAdditionalLen ); + usMBSlaveIDLen += usAdditionalLen; + } + } + else + { + eStatus = MB_ENORES; + } + return eStatus; +} + +eMBException +eMBFuncReportSlaveID( UCHAR * pucFrame, USHORT * usLen ) +{ + memcpy( &pucFrame[MB_PDU_DATA_OFF], &ucMBSlaveID[0], ( size_t )usMBSlaveIDLen ); + *usLen = ( USHORT )( MB_PDU_DATA_OFF + usMBSlaveIDLen ); + return MB_EX_NONE; +} + +#endif diff --git a/apps/modbus/functions/mbutils.c b/apps/modbus/functions/mbutils.c new file mode 100644 index 000000000..6a725703e --- /dev/null +++ b/apps/modbus/functions/mbutils.c @@ -0,0 +1,141 @@ +/* + * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU. + * Copyright (c) 2006 Christian Walter <wolti@sil.at> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * File: $Id: mbutils.c,v 1.6 2007/02/18 23:49:07 wolti Exp $ + */ + +/* ----------------------- System includes ----------------------------------*/ +#include "stdlib.h" +#include "string.h" + +/* ----------------------- Platform includes --------------------------------*/ +#include "port.h" + +/* ----------------------- Modbus includes ----------------------------------*/ +#include "mb.h" +#include "mbproto.h" + +/* ----------------------- Defines ------------------------------------------*/ +#define BITS_UCHAR 8U + +/* ----------------------- Start implementation -----------------------------*/ +void +xMBUtilSetBits( UCHAR * ucByteBuf, USHORT usBitOffset, UCHAR ucNBits, + UCHAR ucValue ) +{ + USHORT usWordBuf; + USHORT usMask; + USHORT usByteOffset; + USHORT usNPreBits; + USHORT usValue = ucValue; + + assert( ucNBits <= 8 ); + assert( ( size_t )BITS_UCHAR == sizeof( UCHAR ) * 8 ); + + /* Calculate byte offset for first byte containing the bit values starting + * at usBitOffset. */ + usByteOffset = ( USHORT )( ( usBitOffset ) / BITS_UCHAR ); + + /* How many bits precede our bits to set. */ + usNPreBits = ( USHORT )( usBitOffset - usByteOffset * BITS_UCHAR ); + + /* Move bit field into position over bits to set */ + usValue <<= usNPreBits; + + /* Prepare a mask for setting the new bits. */ + usMask = ( USHORT )( ( 1 << ( USHORT ) ucNBits ) - 1 ); + usMask <<= usBitOffset - usByteOffset * BITS_UCHAR; + + /* copy bits into temporary storage. */ + usWordBuf = ucByteBuf[usByteOffset]; + usWordBuf |= ucByteBuf[usByteOffset + 1] << BITS_UCHAR; + + /* Zero out bit field bits and then or value bits into them. */ + usWordBuf = ( USHORT )( ( usWordBuf & ( ~usMask ) ) | usValue ); + + /* move bits back into storage */ + ucByteBuf[usByteOffset] = ( UCHAR )( usWordBuf & 0xFF ); + ucByteBuf[usByteOffset + 1] = ( UCHAR )( usWordBuf >> BITS_UCHAR ); +} + +UCHAR +xMBUtilGetBits( UCHAR * ucByteBuf, USHORT usBitOffset, UCHAR ucNBits ) +{ + USHORT usWordBuf; + USHORT usMask; + USHORT usByteOffset; + USHORT usNPreBits; + + /* Calculate byte offset for first byte containing the bit values starting + * at usBitOffset. */ + usByteOffset = ( USHORT )( ( usBitOffset ) / BITS_UCHAR ); + + /* How many bits precede our bits to set. */ + usNPreBits = ( USHORT )( usBitOffset - usByteOffset * BITS_UCHAR ); + + /* Prepare a mask for setting the new bits. */ + usMask = ( USHORT )( ( 1 << ( USHORT ) ucNBits ) - 1 ); + + /* copy bits into temporary storage. */ + usWordBuf = ucByteBuf[usByteOffset]; + usWordBuf |= ucByteBuf[usByteOffset + 1] << BITS_UCHAR; + + /* throw away unneeded bits. */ + usWordBuf >>= usNPreBits; + + /* mask away bits above the requested bitfield. */ + usWordBuf &= usMask; + + return ( UCHAR ) usWordBuf; +} + +eMBException +prveMBError2Exception( eMBErrorCode eErrorCode ) +{ + eMBException eStatus; + + switch ( eErrorCode ) + { + case MB_ENOERR: + eStatus = MB_EX_NONE; + break; + + case MB_ENOREG: + eStatus = MB_EX_ILLEGAL_DATA_ADDRESS; + break; + + case MB_ETIMEDOUT: + eStatus = MB_EX_SLAVE_BUSY; + break; + + default: + eStatus = MB_EX_SLAVE_DEVICE_FAILURE; + break; + } + + return eStatus; +} |