| /**************************************************************************** |
| * apps/functions/mbfuncholding.c |
| * |
| * FreeModbus Library: 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. |
| * |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <nuttx/config.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "port.h" |
| |
| #include "modbus/mb.h" |
| #include "modbus/mbframe.h" |
| #include "modbus/mbproto.h" |
| |
| /**************************************************************************** |
| * Pre-processor Definitions |
| ****************************************************************************/ |
| |
| #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) |
| |
| /**************************************************************************** |
| * External Function Prototypes |
| ****************************************************************************/ |
| |
| eMBException prveMBError2Exception(eMBErrorCode eErrorCode); |
| |
| /**************************************************************************** |
| * Public Functions |
| ****************************************************************************/ |
| |
| #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 occurred 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 occurred 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 |
