/* * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU. * Copyright (c) 2006 Christian Walter * 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 #include #include /* ----------------------- Platform includes --------------------------------*/ #include "port.h" /* ----------------------- Modbus includes ----------------------------------*/ #include #include #include /* ----------------------- 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 -----------------------------*/ #ifdef CONFIG_MB_FUNC_WRITE_HOLDING_ENABLED eMBException eMBFuncWriteHoldingRegister(uint8_t * pucFrame, uint16_t * usLen) { uint16_t usRegAddress; eMBException eStatus = MB_EX_NONE; eMBErrorCode eRegStatus; if (*usLen == (MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN)) { usRegAddress = (uint16_t)(pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF] << 8); usRegAddress |= (uint16_t)(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 #ifdef CONFIG_MB_FUNC_WRITE_MULTIPLE_HOLDING_ENABLED eMBException eMBFuncWriteMultipleHoldingRegister(uint8_t * pucFrame, uint16_t * usLen) { uint16_t usRegAddress; uint16_t usRegCount; uint8_t ucRegByteCount; eMBException eStatus = MB_EX_NONE; eMBErrorCode eRegStatus; if (*usLen >= (MB_PDU_FUNC_WRITE_MUL_SIZE_MIN + MB_PDU_SIZE_MIN)) { usRegAddress = (uint16_t)(pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF] << 8); usRegAddress |= (uint16_t)(pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF + 1]); usRegAddress++; usRegCount = (uint16_t)(pucFrame[MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF] << 8); usRegCount |= (uint16_t)(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 == (uint8_t) (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 occurred 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 #ifdef CONFIG_MB_FUNC_READ_HOLDING_ENABLED eMBException eMBFuncReadHoldingRegister(uint8_t * pucFrame, uint16_t * usLen) { uint16_t usRegAddress; uint16_t usRegCount; uint8_t *pucFrameCur; eMBException eStatus = MB_EX_NONE; eMBErrorCode eRegStatus; if (*usLen == (MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN)) { usRegAddress = (uint16_t)(pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8); usRegAddress |= (uint16_t)(pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1]); usRegAddress++; usRegCount = (uint16_t)(pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF] << 8); usRegCount |= (uint16_t)(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++ = (uint8_t) (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 #ifdef CONFIG_MB_FUNC_READWRITE_HOLDING_ENABLED eMBException eMBFuncReadWriteMultipleHoldingRegister(uint8_t * pucFrame, uint16_t * usLen) { uint16_t usRegReadAddress; uint16_t usRegReadCount; uint16_t usRegWriteAddress; uint16_t usRegWriteCount; uint8_t ucRegWriteByteCount; uint8_t *pucFrameCur; eMBException eStatus = MB_EX_NONE; eMBErrorCode eRegStatus; if (*usLen >= (MB_PDU_FUNC_READWRITE_SIZE_MIN + MB_PDU_SIZE_MIN)) { usRegReadAddress = (uint16_t)(pucFrame[MB_PDU_FUNC_READWRITE_READ_ADDR_OFF] << 8U); usRegReadAddress |= (uint16_t)(pucFrame[MB_PDU_FUNC_READWRITE_READ_ADDR_OFF + 1]); usRegReadAddress++; usRegReadCount = (uint16_t)(pucFrame[MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF] << 8U); usRegReadCount |= (uint16_t)(pucFrame[MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF + 1]); usRegWriteAddress = (uint16_t)(pucFrame[MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF] << 8U); usRegWriteAddress |= (uint16_t)(pucFrame[MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF + 1]); usRegWriteAddress++; usRegWriteCount = (uint16_t)(pucFrame[MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF] << 8U); usRegWriteCount |= (uint16_t)(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++ = (uint8_t) (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