Daniel McKinnell / Modbus-Slave

Forking https://os.mbed.com/users/cam/code/Modbus/ to work for NUCLEO 64 boards

Fork of Cam's original FreeModbus port (https://os.mbed.com/users/cam/code/Modbus/)

Change: - Serial implementation to work for NUCLEO 64 boards and receive interrupts instead of timer. (see `portserial.cpp`)

Added: - Custom RTU mode. Allows for external implementation of packet receiving and sending. Sends and receives packets as whole frames (address + PDU) (i.e. this was added for a custom LoRa implementation). implement `xMBRTUCustGetPDU` and `xMBRTUCustSendResponse` (see `mbport.h`) and call `eMBRTUCustomInit( address )`. implementations need to be fully initialised as `eMBRTUCustomInit` only sets the address and nothing else.

mbfuncholding.cpp@4:7621103c5a40, 2020-08-04 (annotated)

Committer:
danielmckinnell
Date:
Tue Aug 04 04:42:52 2020 +0000
Revision:
4:7621103c5a40
Parent:
0:0453a0a7e500 
RTU Serial updates

Who changed what in which revision?

UserRevisionLine numberNew contents of line
cam 0:0453a0a7e500 1 /*
cam 0:0453a0a7e500 2 * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
cam 0:0453a0a7e500 3 * Copyright (c) 2006 Christian Walter <wolti@sil.at>
cam 0:0453a0a7e500 4 * All rights reserved.
cam 0:0453a0a7e500 5 *
cam 0:0453a0a7e500 6 * Redistribution and use in source and binary forms, with or without
cam 0:0453a0a7e500 7 * modification, are permitted provided that the following conditions
cam 0:0453a0a7e500 8 * are met:
cam 0:0453a0a7e500 9 * 1. Redistributions of source code must retain the above copyright
cam 0:0453a0a7e500 10 * notice, this list of conditions and the following disclaimer.
cam 0:0453a0a7e500 11 * 2. Redistributions in binary form must reproduce the above copyright
cam 0:0453a0a7e500 12 * notice, this list of conditions and the following disclaimer in the
cam 0:0453a0a7e500 13 * documentation and/or other materials provided with the distribution.
cam 0:0453a0a7e500 14 * 3. The name of the author may not be used to endorse or promote products
cam 0:0453a0a7e500 15 * derived from this software without specific prior written permission.
cam 0:0453a0a7e500 16 *
cam 0:0453a0a7e500 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
cam 0:0453a0a7e500 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
cam 0:0453a0a7e500 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
cam 0:0453a0a7e500 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
cam 0:0453a0a7e500 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
cam 0:0453a0a7e500 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
cam 0:0453a0a7e500 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
cam 0:0453a0a7e500 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
cam 0:0453a0a7e500 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
cam 0:0453a0a7e500 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
cam 0:0453a0a7e500 27 *
cam 0:0453a0a7e500 28 * File: $Id: mbfuncholding.c,v 1.12 2007/02/18 23:48:22 wolti Exp $
cam 0:0453a0a7e500 29 */
cam 0:0453a0a7e500 30
cam 0:0453a0a7e500 31 /* ----------------------- System includes ----------------------------------*/
cam 0:0453a0a7e500 32 #include "stdlib.h"
cam 0:0453a0a7e500 33 #include "string.h"
cam 0:0453a0a7e500 34
cam 0:0453a0a7e500 35 /* ----------------------- Platform includes --------------------------------*/
cam 0:0453a0a7e500 36 #include "port.h"
cam 0:0453a0a7e500 37
cam 0:0453a0a7e500 38 /* ----------------------- Modbus includes ----------------------------------*/
cam 0:0453a0a7e500 39 #include "mb.h"
cam 0:0453a0a7e500 40 #include "mbframe.h"
cam 0:0453a0a7e500 41 #include "mbproto.h"
cam 0:0453a0a7e500 42 #include "mbconfig.h"
cam 0:0453a0a7e500 43
cam 0:0453a0a7e500 44 /* ----------------------- Defines ------------------------------------------*/
cam 0:0453a0a7e500 45 #define MB_PDU_FUNC_READ_ADDR_OFF ( MB_PDU_DATA_OFF + 0)
cam 0:0453a0a7e500 46 #define MB_PDU_FUNC_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 )
cam 0:0453a0a7e500 47 #define MB_PDU_FUNC_READ_SIZE ( 4 )
cam 0:0453a0a7e500 48 #define MB_PDU_FUNC_READ_REGCNT_MAX ( 0x007D )
cam 0:0453a0a7e500 49
cam 0:0453a0a7e500 50 #define MB_PDU_FUNC_WRITE_ADDR_OFF ( MB_PDU_DATA_OFF + 0)
cam 0:0453a0a7e500 51 #define MB_PDU_FUNC_WRITE_VALUE_OFF ( MB_PDU_DATA_OFF + 2 )
cam 0:0453a0a7e500 52 #define MB_PDU_FUNC_WRITE_SIZE ( 4 )
cam 0:0453a0a7e500 53
cam 0:0453a0a7e500 54 #define MB_PDU_FUNC_WRITE_MUL_ADDR_OFF ( MB_PDU_DATA_OFF + 0 )
cam 0:0453a0a7e500 55 #define MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 )
cam 0:0453a0a7e500 56 #define MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF ( MB_PDU_DATA_OFF + 4 )
cam 0:0453a0a7e500 57 #define MB_PDU_FUNC_WRITE_MUL_VALUES_OFF ( MB_PDU_DATA_OFF + 5 )
cam 0:0453a0a7e500 58 #define MB_PDU_FUNC_WRITE_MUL_SIZE_MIN ( 5 )
cam 0:0453a0a7e500 59 #define MB_PDU_FUNC_WRITE_MUL_REGCNT_MAX ( 0x0078 )
cam 0:0453a0a7e500 60
cam 0:0453a0a7e500 61 #define MB_PDU_FUNC_READWRITE_READ_ADDR_OFF ( MB_PDU_DATA_OFF + 0 )
cam 0:0453a0a7e500 62 #define MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 )
cam 0:0453a0a7e500 63 #define MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF ( MB_PDU_DATA_OFF + 4 )
cam 0:0453a0a7e500 64 #define MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF ( MB_PDU_DATA_OFF + 6 )
cam 0:0453a0a7e500 65 #define MB_PDU_FUNC_READWRITE_BYTECNT_OFF ( MB_PDU_DATA_OFF + 8 )
cam 0:0453a0a7e500 66 #define MB_PDU_FUNC_READWRITE_WRITE_VALUES_OFF ( MB_PDU_DATA_OFF + 9 )
cam 0:0453a0a7e500 67 #define MB_PDU_FUNC_READWRITE_SIZE_MIN ( 9 )
cam 0:0453a0a7e500 68
cam 0:0453a0a7e500 69 /* ----------------------- Static functions ---------------------------------*/
cam 0:0453a0a7e500 70 eMBException prveMBError2Exception( eMBErrorCode eErrorCode );
cam 0:0453a0a7e500 71
cam 0:0453a0a7e500 72 /* ----------------------- Start implementation -----------------------------*/
cam 0:0453a0a7e500 73
cam 0:0453a0a7e500 74 #if MB_FUNC_WRITE_HOLDING_ENABLED > 0
cam 0:0453a0a7e500 75
cam 0:0453a0a7e500 76 eMBException
cam 0:0453a0a7e500 77 eMBFuncWriteHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
cam 0:0453a0a7e500 78 {
cam 0:0453a0a7e500 79 USHORT usRegAddress;
cam 0:0453a0a7e500 80 eMBException eStatus = MB_EX_NONE;
cam 0:0453a0a7e500 81 eMBErrorCode eRegStatus;
cam 0:0453a0a7e500 82
cam 0:0453a0a7e500 83 if( *usLen == ( MB_PDU_FUNC_WRITE_SIZE + MB_PDU_SIZE_MIN ) )
cam 0:0453a0a7e500 84 {
cam 0:0453a0a7e500 85 usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF] << 8 );
cam 0:0453a0a7e500 86 usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF + 1] );
cam 0:0453a0a7e500 87 usRegAddress++;
cam 0:0453a0a7e500 88
cam 0:0453a0a7e500 89 /* Make callback to update the value. */
cam 0:0453a0a7e500 90 eRegStatus = eMBRegHoldingCB( &pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF],
cam 0:0453a0a7e500 91 usRegAddress, 1, MB_REG_WRITE );
cam 0:0453a0a7e500 92
cam 0:0453a0a7e500 93 /* If an error occured convert it into a Modbus exception. */
cam 0:0453a0a7e500 94 if( eRegStatus != MB_ENOERR )
cam 0:0453a0a7e500 95 {
cam 0:0453a0a7e500 96 eStatus = prveMBError2Exception( eRegStatus );
cam 0:0453a0a7e500 97 }
cam 0:0453a0a7e500 98 }
cam 0:0453a0a7e500 99 else
cam 0:0453a0a7e500 100 {
cam 0:0453a0a7e500 101 /* Can't be a valid request because the length is incorrect. */
cam 0:0453a0a7e500 102 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
cam 0:0453a0a7e500 103 }
cam 0:0453a0a7e500 104 return eStatus;
cam 0:0453a0a7e500 105 }
cam 0:0453a0a7e500 106 #endif
cam 0:0453a0a7e500 107
cam 0:0453a0a7e500 108 #if MB_FUNC_WRITE_MULTIPLE_HOLDING_ENABLED > 0
cam 0:0453a0a7e500 109 eMBException
cam 0:0453a0a7e500 110 eMBFuncWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
cam 0:0453a0a7e500 111 {
cam 0:0453a0a7e500 112 USHORT usRegAddress;
cam 0:0453a0a7e500 113 USHORT usRegCount;
cam 0:0453a0a7e500 114 UCHAR ucRegByteCount;
cam 0:0453a0a7e500 115
cam 0:0453a0a7e500 116 eMBException eStatus = MB_EX_NONE;
cam 0:0453a0a7e500 117 eMBErrorCode eRegStatus;
cam 0:0453a0a7e500 118
cam 0:0453a0a7e500 119 if( *usLen >= ( MB_PDU_FUNC_WRITE_MUL_SIZE_MIN + MB_PDU_SIZE_MIN ) )
cam 0:0453a0a7e500 120 {
cam 0:0453a0a7e500 121 usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF] << 8 );
cam 0:0453a0a7e500 122 usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_ADDR_OFF + 1] );
cam 0:0453a0a7e500 123 usRegAddress++;
cam 0:0453a0a7e500 124
cam 0:0453a0a7e500 125 usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF] << 8 );
cam 0:0453a0a7e500 126 usRegCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF + 1] );
cam 0:0453a0a7e500 127
cam 0:0453a0a7e500 128 ucRegByteCount = pucFrame[MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF];
cam 0:0453a0a7e500 129
cam 0:0453a0a7e500 130 if( ( usRegCount >= 1 ) &&
cam 0:0453a0a7e500 131 ( usRegCount <= MB_PDU_FUNC_WRITE_MUL_REGCNT_MAX ) &&
cam 0:0453a0a7e500 132 ( ucRegByteCount == ( UCHAR ) ( 2 * usRegCount ) ) )
cam 0:0453a0a7e500 133 {
cam 0:0453a0a7e500 134 /* Make callback to update the register values. */
cam 0:0453a0a7e500 135 eRegStatus =
cam 0:0453a0a7e500 136 eMBRegHoldingCB( &pucFrame[MB_PDU_FUNC_WRITE_MUL_VALUES_OFF],
cam 0:0453a0a7e500 137 usRegAddress, usRegCount, MB_REG_WRITE );
cam 0:0453a0a7e500 138
cam 0:0453a0a7e500 139 /* If an error occured convert it into a Modbus exception. */
cam 0:0453a0a7e500 140 if( eRegStatus != MB_ENOERR )
cam 0:0453a0a7e500 141 {
cam 0:0453a0a7e500 142 eStatus = prveMBError2Exception( eRegStatus );
cam 0:0453a0a7e500 143 }
cam 0:0453a0a7e500 144 else
cam 0:0453a0a7e500 145 {
cam 0:0453a0a7e500 146 /* The response contains the function code, the starting
cam 0:0453a0a7e500 147 * address and the quantity of registers. We reuse the
cam 0:0453a0a7e500 148 * old values in the buffer because they are still valid.
cam 0:0453a0a7e500 149 */
cam 0:0453a0a7e500 150 *usLen = MB_PDU_FUNC_WRITE_MUL_BYTECNT_OFF;
cam 0:0453a0a7e500 151 }
cam 0:0453a0a7e500 152 }
cam 0:0453a0a7e500 153 else
cam 0:0453a0a7e500 154 {
cam 0:0453a0a7e500 155 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
cam 0:0453a0a7e500 156 }
cam 0:0453a0a7e500 157 }
cam 0:0453a0a7e500 158 else
cam 0:0453a0a7e500 159 {
cam 0:0453a0a7e500 160 /* Can't be a valid request because the length is incorrect. */
cam 0:0453a0a7e500 161 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
cam 0:0453a0a7e500 162 }
cam 0:0453a0a7e500 163 return eStatus;
cam 0:0453a0a7e500 164 }
cam 0:0453a0a7e500 165 #endif
cam 0:0453a0a7e500 166
cam 0:0453a0a7e500 167 #if MB_FUNC_READ_HOLDING_ENABLED > 0
cam 0:0453a0a7e500 168
cam 0:0453a0a7e500 169 eMBException
cam 0:0453a0a7e500 170 eMBFuncReadHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
cam 0:0453a0a7e500 171 {
cam 0:0453a0a7e500 172 USHORT usRegAddress;
cam 0:0453a0a7e500 173 USHORT usRegCount;
cam 0:0453a0a7e500 174 UCHAR *pucFrameCur;
cam 0:0453a0a7e500 175
cam 0:0453a0a7e500 176 eMBException eStatus = MB_EX_NONE;
cam 0:0453a0a7e500 177 eMBErrorCode eRegStatus;
cam 0:0453a0a7e500 178
cam 0:0453a0a7e500 179 if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) )
cam 0:0453a0a7e500 180 {
cam 0:0453a0a7e500 181 usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 );
cam 0:0453a0a7e500 182 usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] );
cam 0:0453a0a7e500 183 usRegAddress++;
cam 0:0453a0a7e500 184
cam 0:0453a0a7e500 185 usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF] << 8 );
cam 0:0453a0a7e500 186 usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF + 1] );
cam 0:0453a0a7e500 187
cam 0:0453a0a7e500 188 /* Check if the number of registers to read is valid. If not
cam 0:0453a0a7e500 189 * return Modbus illegal data value exception.
cam 0:0453a0a7e500 190 */
cam 0:0453a0a7e500 191 if( ( usRegCount >= 1 ) && ( usRegCount <= MB_PDU_FUNC_READ_REGCNT_MAX ) )
cam 0:0453a0a7e500 192 {
cam 0:0453a0a7e500 193 /* Set the current PDU data pointer to the beginning. */
cam 0:0453a0a7e500 194 pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF];
cam 0:0453a0a7e500 195 *usLen = MB_PDU_FUNC_OFF;
cam 0:0453a0a7e500 196
cam 0:0453a0a7e500 197 /* First byte contains the function code. */
cam 0:0453a0a7e500 198 *pucFrameCur++ = MB_FUNC_READ_HOLDING_REGISTER;
cam 0:0453a0a7e500 199 *usLen += 1;
cam 0:0453a0a7e500 200
cam 0:0453a0a7e500 201 /* Second byte in the response contain the number of bytes. */
cam 0:0453a0a7e500 202 *pucFrameCur++ = ( UCHAR ) ( usRegCount * 2 );
cam 0:0453a0a7e500 203 *usLen += 1;
cam 0:0453a0a7e500 204
cam 0:0453a0a7e500 205 /* Make callback to fill the buffer. */
cam 0:0453a0a7e500 206 eRegStatus = eMBRegHoldingCB( pucFrameCur, usRegAddress, usRegCount, MB_REG_READ );
cam 0:0453a0a7e500 207 /* If an error occured convert it into a Modbus exception. */
cam 0:0453a0a7e500 208 if( eRegStatus != MB_ENOERR )
cam 0:0453a0a7e500 209 {
cam 0:0453a0a7e500 210 eStatus = prveMBError2Exception( eRegStatus );
cam 0:0453a0a7e500 211 }
cam 0:0453a0a7e500 212 else
cam 0:0453a0a7e500 213 {
cam 0:0453a0a7e500 214 *usLen += usRegCount * 2;
cam 0:0453a0a7e500 215 }
cam 0:0453a0a7e500 216 }
cam 0:0453a0a7e500 217 else
cam 0:0453a0a7e500 218 {
cam 0:0453a0a7e500 219 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
cam 0:0453a0a7e500 220 }
cam 0:0453a0a7e500 221 }
cam 0:0453a0a7e500 222 else
cam 0:0453a0a7e500 223 {
cam 0:0453a0a7e500 224 /* Can't be a valid request because the length is incorrect. */
cam 0:0453a0a7e500 225 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
cam 0:0453a0a7e500 226 }
cam 0:0453a0a7e500 227 return eStatus;
cam 0:0453a0a7e500 228 }
cam 0:0453a0a7e500 229
cam 0:0453a0a7e500 230 #endif
cam 0:0453a0a7e500 231
cam 0:0453a0a7e500 232 #if MB_FUNC_READWRITE_HOLDING_ENABLED > 0
cam 0:0453a0a7e500 233
cam 0:0453a0a7e500 234 eMBException
cam 0:0453a0a7e500 235 eMBFuncReadWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
cam 0:0453a0a7e500 236 {
cam 0:0453a0a7e500 237 USHORT usRegReadAddress;
cam 0:0453a0a7e500 238 USHORT usRegReadCount;
cam 0:0453a0a7e500 239 USHORT usRegWriteAddress;
cam 0:0453a0a7e500 240 USHORT usRegWriteCount;
cam 0:0453a0a7e500 241 UCHAR ucRegWriteByteCount;
cam 0:0453a0a7e500 242 UCHAR *pucFrameCur;
cam 0:0453a0a7e500 243
cam 0:0453a0a7e500 244 eMBException eStatus = MB_EX_NONE;
cam 0:0453a0a7e500 245 eMBErrorCode eRegStatus;
cam 0:0453a0a7e500 246
cam 0:0453a0a7e500 247 if( *usLen >= ( MB_PDU_FUNC_READWRITE_SIZE_MIN + MB_PDU_SIZE_MIN ) )
cam 0:0453a0a7e500 248 {
cam 0:0453a0a7e500 249 usRegReadAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_ADDR_OFF] << 8U );
cam 0:0453a0a7e500 250 usRegReadAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_ADDR_OFF + 1] );
cam 0:0453a0a7e500 251 usRegReadAddress++;
cam 0:0453a0a7e500 252
cam 0:0453a0a7e500 253 usRegReadCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF] << 8U );
cam 0:0453a0a7e500 254 usRegReadCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_READ_REGCNT_OFF + 1] );
cam 0:0453a0a7e500 255
cam 0:0453a0a7e500 256 usRegWriteAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF] << 8U );
cam 0:0453a0a7e500 257 usRegWriteAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_ADDR_OFF + 1] );
cam 0:0453a0a7e500 258 usRegWriteAddress++;
cam 0:0453a0a7e500 259
cam 0:0453a0a7e500 260 usRegWriteCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF] << 8U );
cam 0:0453a0a7e500 261 usRegWriteCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READWRITE_WRITE_REGCNT_OFF + 1] );
cam 0:0453a0a7e500 262
cam 0:0453a0a7e500 263 ucRegWriteByteCount = pucFrame[MB_PDU_FUNC_READWRITE_BYTECNT_OFF];
cam 0:0453a0a7e500 264
cam 0:0453a0a7e500 265 if( ( usRegReadCount >= 1 ) && ( usRegReadCount <= 0x7D ) &&
cam 0:0453a0a7e500 266 ( usRegWriteCount >= 1 ) && ( usRegWriteCount <= 0x79 ) &&
cam 0:0453a0a7e500 267 ( ( 2 * usRegWriteCount ) == ucRegWriteByteCount ) )
cam 0:0453a0a7e500 268 {
cam 0:0453a0a7e500 269 /* Make callback to update the register values. */
cam 0:0453a0a7e500 270 eRegStatus = eMBRegHoldingCB( &pucFrame[MB_PDU_FUNC_READWRITE_WRITE_VALUES_OFF],
cam 0:0453a0a7e500 271 usRegWriteAddress, usRegWriteCount, MB_REG_WRITE );
cam 0:0453a0a7e500 272
cam 0:0453a0a7e500 273 if( eRegStatus == MB_ENOERR )
cam 0:0453a0a7e500 274 {
cam 0:0453a0a7e500 275 /* Set the current PDU data pointer to the beginning. */
cam 0:0453a0a7e500 276 pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF];
cam 0:0453a0a7e500 277 *usLen = MB_PDU_FUNC_OFF;
cam 0:0453a0a7e500 278
cam 0:0453a0a7e500 279 /* First byte contains the function code. */
cam 0:0453a0a7e500 280 *pucFrameCur++ = MB_FUNC_READWRITE_MULTIPLE_REGISTERS;
cam 0:0453a0a7e500 281 *usLen += 1;
cam 0:0453a0a7e500 282
cam 0:0453a0a7e500 283 /* Second byte in the response contain the number of bytes. */
cam 0:0453a0a7e500 284 *pucFrameCur++ = ( UCHAR ) ( usRegReadCount * 2 );
cam 0:0453a0a7e500 285 *usLen += 1;
cam 0:0453a0a7e500 286
cam 0:0453a0a7e500 287 /* Make the read callback. */
cam 0:0453a0a7e500 288 eRegStatus =
cam 0:0453a0a7e500 289 eMBRegHoldingCB( pucFrameCur, usRegReadAddress, usRegReadCount, MB_REG_READ );
cam 0:0453a0a7e500 290 if( eRegStatus == MB_ENOERR )
cam 0:0453a0a7e500 291 {
cam 0:0453a0a7e500 292 *usLen += 2 * usRegReadCount;
cam 0:0453a0a7e500 293 }
cam 0:0453a0a7e500 294 }
cam 0:0453a0a7e500 295 if( eRegStatus != MB_ENOERR )
cam 0:0453a0a7e500 296 {
cam 0:0453a0a7e500 297 eStatus = prveMBError2Exception( eRegStatus );
cam 0:0453a0a7e500 298 }
cam 0:0453a0a7e500 299 }
cam 0:0453a0a7e500 300 else
cam 0:0453a0a7e500 301 {
cam 0:0453a0a7e500 302 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
cam 0:0453a0a7e500 303 }
cam 0:0453a0a7e500 304 }
cam 0:0453a0a7e500 305 return eStatus;
cam 0:0453a0a7e500 306 }
cam 0:0453a0a7e500 307
cam 0:0453a0a7e500 308 #endif