1 /*
2 * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
3 * Copyright (C) 2013 Armink <armink.ztl@gmail.com>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * File: $Id: mbfuncholding_m.c,v 1.60 2013/09/02 14:13:40 Armink Add Master Functions Exp $
29 */
30
31 /* ----------------------- System includes ----------------------------------*/
32 #include "stdlib.h"
33 #include "string.h"
34
35 /* ----------------------- Platform includes --------------------------------*/
36 #include "port.h"
37
38 /* ----------------------- Modbus includes ----------------------------------*/
39 //#include "mb.h"
40 #include "mb_m.h"
41 #include "mbframe.h"
42 #include "mbproto.h"
43 #include "mbconfig.h"
44
45 /* ----------------------- Defines ------------------------------------------*/
46 #define MB_PDU_REQ_READ_ADDR_OFF ( MB_PDU_DATA_OFF + 0 )
47 #define MB_PDU_REQ_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 )
48 #define MB_PDU_REQ_READ_SIZE ( 4 )
49 #define MB_PDU_FUNC_READ_REGCNT_MAX ( 0x007D )
50 #define MB_PDU_FUNC_READ_BYTECNT_OFF ( MB_PDU_DATA_OFF + 0 )
51 #define MB_PDU_FUNC_READ_VALUES_OFF ( MB_PDU_DATA_OFF + 1 )
52 #define MB_PDU_FUNC_READ_SIZE_MIN ( 1 )
53
54 #define MB_PDU_REQ_WRITE_ADDR_OFF ( MB_PDU_DATA_OFF + 0)
55 #define MB_PDU_REQ_WRITE_VALUE_OFF ( MB_PDU_DATA_OFF + 2 )
56 #define MB_PDU_REQ_WRITE_SIZE ( 4 )
57 #define MB_PDU_FUNC_WRITE_ADDR_OFF ( MB_PDU_DATA_OFF + 0)
58 #define MB_PDU_FUNC_WRITE_VALUE_OFF ( MB_PDU_DATA_OFF + 2 )
59 #define MB_PDU_FUNC_WRITE_SIZE ( 4 )
60
61 #define MB_PDU_REQ_WRITE_MUL_ADDR_OFF ( MB_PDU_DATA_OFF + 0 )
62 #define MB_PDU_REQ_WRITE_MUL_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 )
63 #define MB_PDU_REQ_WRITE_MUL_BYTECNT_OFF ( MB_PDU_DATA_OFF + 4 )
64 #define MB_PDU_REQ_WRITE_MUL_VALUES_OFF ( MB_PDU_DATA_OFF + 5 )
65 #define MB_PDU_REQ_WRITE_MUL_SIZE_MIN ( 5 )
66 #define MB_PDU_REQ_WRITE_MUL_REGCNT_MAX ( 0x0078 )
67 #define MB_PDU_FUNC_WRITE_MUL_ADDR_OFF ( MB_PDU_DATA_OFF + 0 )
68 #define MB_PDU_FUNC_WRITE_MUL_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 )
69 #define MB_PDU_FUNC_WRITE_MUL_SIZE ( 4 )
70
71 #define MB_PDU_REQ_READWRITE_READ_ADDR_OFF ( MB_PDU_DATA_OFF + 0 )
72 #define MB_PDU_REQ_READWRITE_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 )
73 #define MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF ( MB_PDU_DATA_OFF + 4 )
74 #define MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF ( MB_PDU_DATA_OFF + 6 )
75 #define MB_PDU_REQ_READWRITE_WRITE_BYTECNT_OFF ( MB_PDU_DATA_OFF + 8 )
76 #define MB_PDU_REQ_READWRITE_WRITE_VALUES_OFF ( MB_PDU_DATA_OFF + 9 )
77 #define MB_PDU_REQ_READWRITE_SIZE_MIN ( 9 )
78 #define MB_PDU_FUNC_READWRITE_READ_BYTECNT_OFF ( MB_PDU_DATA_OFF + 0 )
79 #define MB_PDU_FUNC_READWRITE_READ_VALUES_OFF ( MB_PDU_DATA_OFF + 1 )
80 #define MB_PDU_FUNC_READWRITE_SIZE_MIN ( 1 )
81
82 /* ----------------------- Static functions ---------------------------------*/
83 eMBException prveMBError2Exception( eMBErrorCode eErrorCode );
84
85 /* ----------------------- Start implementation -----------------------------*/
86 #if MB_MASTER_RTU_ENABLED || MB_MASTER_ASCII_ENABLED || MB_MASTER_TCP_ENABLED
87
88 #if MB_FUNC_WRITE_HOLDING_ENABLED
89
90 /**
91 * This function will request write holding register.
92 *
93 * @param ucSndAddr salve address
94 * @param usRegAddr register start address
95 * @param usRegData register data to be written
96 * @param lTimeOut timeout (-1 will waiting forever)
97 *
98 * @return error code
99 */
100 eMBMasterReqErrCode
eMBMasterReqWriteHoldingRegister(UCHAR ucSndAddr,USHORT usRegAddr,USHORT usRegData,LONG lTimeOut)101 eMBMasterReqWriteHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usRegData, LONG lTimeOut )
102 {
103 UCHAR *ucMBFrame;
104 eMBMasterReqErrCode eErrStatus = MB_MRE_NO_ERR;
105
106 if ( ucSndAddr > MB_MASTER_TOTAL_SLAVE_NUM ) eErrStatus = MB_MRE_ILL_ARG;
107 else if ( xMBMasterRunResTake( lTimeOut ) == FALSE ) eErrStatus = MB_MRE_MASTER_BUSY;
108 else
109 {
110 vMBMasterGetPDUSndBuf(&ucMBFrame);
111 vMBMasterSetDestAddress(ucSndAddr);
112 ucMBFrame[MB_PDU_FUNC_OFF] = MB_FUNC_WRITE_REGISTER;
113 ucMBFrame[MB_PDU_REQ_WRITE_ADDR_OFF] = usRegAddr >> 8;
114 ucMBFrame[MB_PDU_REQ_WRITE_ADDR_OFF + 1] = usRegAddr;
115 ucMBFrame[MB_PDU_REQ_WRITE_VALUE_OFF] = usRegData >> 8;
116 ucMBFrame[MB_PDU_REQ_WRITE_VALUE_OFF + 1] = usRegData ;
117 vMBMasterSetPDUSndLength( MB_PDU_SIZE_MIN + MB_PDU_REQ_WRITE_SIZE );
118 ( void ) xMBMasterPortEventPost( EV_MASTER_FRAME_TRANSMIT );
119 eErrStatus = eMBMasterWaitRequestFinish( );
120 }
121 return eErrStatus;
122 }
123
124 eMBException
eMBMasterFuncWriteHoldingRegister(UCHAR * pucFrame,USHORT * usLen)125 eMBMasterFuncWriteHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
126 {
127 USHORT usRegAddress;
128 eMBException eStatus = MB_EX_NONE;
129 eMBErrorCode eRegStatus;
130
131 if( *usLen == ( MB_PDU_SIZE_MIN + MB_PDU_FUNC_WRITE_SIZE ) )
132 {
133 usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF] << 8 );
134 usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_WRITE_ADDR_OFF + 1] );
135 usRegAddress++;
136
137 /* Make callback to update the value. */
138 eRegStatus = eMBMasterRegHoldingCB( &pucFrame[MB_PDU_FUNC_WRITE_VALUE_OFF],
139 usRegAddress, 1, MB_REG_WRITE );
140
141 /* If an error occured convert it into a Modbus exception. */
142 if( eRegStatus != MB_ENOERR )
143 {
144 eStatus = prveMBError2Exception( eRegStatus );
145 }
146 }
147 else
148 {
149 /* Can't be a valid request because the length is incorrect. */
150 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
151 }
152 return eStatus;
153 }
154 #endif
155
156 #if MB_FUNC_WRITE_MULTIPLE_HOLDING_ENABLED > 0
157
158 /**
159 * This function will request write multiple holding register.
160 *
161 * @param ucSndAddr salve address
162 * @param usRegAddr register start address
163 * @param usNRegs register total number
164 * @param pusDataBuffer data to be written
165 * @param lTimeOut timeout (-1 will waiting forever)
166 *
167 * @return error code
168 */
169 eMBMasterReqErrCode
eMBMasterReqWriteMultipleHoldingRegister(UCHAR ucSndAddr,USHORT usRegAddr,USHORT usNRegs,USHORT * pusDataBuffer,LONG lTimeOut)170 eMBMasterReqWriteMultipleHoldingRegister( UCHAR ucSndAddr,
171 USHORT usRegAddr, USHORT usNRegs, USHORT * pusDataBuffer, LONG lTimeOut )
172 {
173 UCHAR *ucMBFrame;
174 USHORT usRegIndex = 0;
175 eMBMasterReqErrCode eErrStatus = MB_MRE_NO_ERR;
176
177 if ( ucSndAddr > MB_MASTER_TOTAL_SLAVE_NUM ) eErrStatus = MB_MRE_ILL_ARG;
178 else if ( xMBMasterRunResTake( lTimeOut ) == FALSE ) eErrStatus = MB_MRE_MASTER_BUSY;
179 else
180 {
181 vMBMasterGetPDUSndBuf(&ucMBFrame);
182 vMBMasterSetDestAddress(ucSndAddr);
183 ucMBFrame[MB_PDU_FUNC_OFF] = MB_FUNC_WRITE_MULTIPLE_REGISTERS;
184 ucMBFrame[MB_PDU_REQ_WRITE_MUL_ADDR_OFF] = usRegAddr >> 8;
185 ucMBFrame[MB_PDU_REQ_WRITE_MUL_ADDR_OFF + 1] = usRegAddr;
186 ucMBFrame[MB_PDU_REQ_WRITE_MUL_REGCNT_OFF] = usNRegs >> 8;
187 ucMBFrame[MB_PDU_REQ_WRITE_MUL_REGCNT_OFF + 1] = usNRegs ;
188 ucMBFrame[MB_PDU_REQ_WRITE_MUL_BYTECNT_OFF] = usNRegs * 2;
189 ucMBFrame += MB_PDU_REQ_WRITE_MUL_VALUES_OFF;
190 while( usNRegs > usRegIndex)
191 {
192 *ucMBFrame++ = pusDataBuffer[usRegIndex] >> 8;
193 *ucMBFrame++ = pusDataBuffer[usRegIndex++] ;
194 }
195 vMBMasterSetPDUSndLength( MB_PDU_SIZE_MIN + MB_PDU_REQ_WRITE_MUL_SIZE_MIN + 2*usNRegs );
196 ( void ) xMBMasterPortEventPost( EV_MASTER_FRAME_TRANSMIT );
197 eErrStatus = eMBMasterWaitRequestFinish( );
198 }
199 return eErrStatus;
200 }
201
202 eMBException
eMBMasterFuncWriteMultipleHoldingRegister(UCHAR * pucFrame,USHORT * usLen)203 eMBMasterFuncWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
204 {
205 UCHAR *ucMBFrame;
206 USHORT usRegAddress;
207 USHORT usRegCount;
208 UCHAR ucRegByteCount;
209
210 eMBException eStatus = MB_EX_NONE;
211 eMBErrorCode eRegStatus;
212
213 /* If this request is broadcast, the *usLen is not need check. */
214 if( ( *usLen == MB_PDU_SIZE_MIN + MB_PDU_FUNC_WRITE_MUL_SIZE ) || xMBMasterRequestIsBroadcast() )
215 {
216 vMBMasterGetPDUSndBuf(&ucMBFrame);
217 usRegAddress = ( USHORT )( ucMBFrame[MB_PDU_REQ_WRITE_MUL_ADDR_OFF] << 8 );
218 usRegAddress |= ( USHORT )( ucMBFrame[MB_PDU_REQ_WRITE_MUL_ADDR_OFF + 1] );
219 usRegAddress++;
220
221 usRegCount = ( USHORT )( ucMBFrame[MB_PDU_REQ_WRITE_MUL_REGCNT_OFF] << 8 );
222 usRegCount |= ( USHORT )( ucMBFrame[MB_PDU_REQ_WRITE_MUL_REGCNT_OFF + 1] );
223
224 ucRegByteCount = ucMBFrame[MB_PDU_REQ_WRITE_MUL_BYTECNT_OFF];
225
226 if( ucRegByteCount == 2 * usRegCount )
227 {
228 /* Make callback to update the register values. */
229 eRegStatus = eMBMasterRegHoldingCB( &ucMBFrame[MB_PDU_REQ_WRITE_MUL_VALUES_OFF],
230 usRegAddress, usRegCount, MB_REG_WRITE );
231
232 /* If an error occured convert it into a Modbus exception. */
233 if( eRegStatus != MB_ENOERR )
234 {
235 eStatus = prveMBError2Exception( eRegStatus );
236 }
237 }
238 else
239 {
240 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
241 }
242 }
243 else
244 {
245 /* Can't be a valid request because the length is incorrect. */
246 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
247 }
248 return eStatus;
249 }
250 #endif
251
252 #if MB_FUNC_READ_HOLDING_ENABLED > 0
253
254 /**
255 * This function will request read holding register.
256 *
257 * @param ucSndAddr salve address
258 * @param usRegAddr register start address
259 * @param usNRegs register total number
260 * @param lTimeOut timeout (-1 will waiting forever)
261 *
262 * @return error code
263 */
264 eMBMasterReqErrCode
eMBMasterReqReadHoldingRegister(UCHAR ucSndAddr,USHORT usRegAddr,USHORT usNRegs,LONG lTimeOut)265 eMBMasterReqReadHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usNRegs, LONG lTimeOut )
266 {
267 UCHAR *ucMBFrame;
268 eMBMasterReqErrCode eErrStatus = MB_MRE_NO_ERR;
269
270 if ( ucSndAddr > MB_MASTER_TOTAL_SLAVE_NUM ) eErrStatus = MB_MRE_ILL_ARG;
271 else if ( xMBMasterRunResTake( lTimeOut ) == FALSE ) eErrStatus = MB_MRE_MASTER_BUSY;
272 else
273 {
274 vMBMasterGetPDUSndBuf(&ucMBFrame);
275 vMBMasterSetDestAddress(ucSndAddr);
276 ucMBFrame[MB_PDU_FUNC_OFF] = MB_FUNC_READ_HOLDING_REGISTER;
277 ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF] = usRegAddr >> 8;
278 ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF + 1] = usRegAddr;
279 ucMBFrame[MB_PDU_REQ_READ_REGCNT_OFF] = usNRegs >> 8;
280 ucMBFrame[MB_PDU_REQ_READ_REGCNT_OFF + 1] = usNRegs;
281 vMBMasterSetPDUSndLength( MB_PDU_SIZE_MIN + MB_PDU_REQ_READ_SIZE );
282 ( void ) xMBMasterPortEventPost( EV_MASTER_FRAME_TRANSMIT );
283 eErrStatus = eMBMasterWaitRequestFinish( );
284 }
285 return eErrStatus;
286 }
287
288 eMBException
eMBMasterFuncReadHoldingRegister(UCHAR * pucFrame,USHORT * usLen)289 eMBMasterFuncReadHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
290 {
291 UCHAR *ucMBFrame;
292 USHORT usRegAddress;
293 USHORT usRegCount;
294
295 eMBException eStatus = MB_EX_NONE;
296 eMBErrorCode eRegStatus;
297
298 /* If this request is broadcast, and it's read mode. This request don't need execute. */
299 if ( xMBMasterRequestIsBroadcast() )
300 {
301 eStatus = MB_EX_NONE;
302 }
303 else if( *usLen >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READ_SIZE_MIN )
304 {
305 vMBMasterGetPDUSndBuf(&ucMBFrame);
306 usRegAddress = ( USHORT )( ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF] << 8 );
307 usRegAddress |= ( USHORT )( ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF + 1] );
308 usRegAddress++;
309
310 usRegCount = ( USHORT )( ucMBFrame[MB_PDU_REQ_READ_REGCNT_OFF] << 8 );
311 usRegCount |= ( USHORT )( ucMBFrame[MB_PDU_REQ_READ_REGCNT_OFF + 1] );
312
313 /* Check if the number of registers to read is valid. If not
314 * return Modbus illegal data value exception.
315 */
316 if( ( usRegCount >= 1 ) && ( 2 * usRegCount == pucFrame[MB_PDU_FUNC_READ_BYTECNT_OFF] ) )
317 {
318 /* Make callback to fill the buffer. */
319 eRegStatus = eMBMasterRegHoldingCB( &pucFrame[MB_PDU_FUNC_READ_VALUES_OFF], usRegAddress, usRegCount, MB_REG_READ );
320 /* If an error occured convert it into a Modbus exception. */
321 if( eRegStatus != MB_ENOERR )
322 {
323 eStatus = prveMBError2Exception( eRegStatus );
324 }
325 }
326 else
327 {
328 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
329 }
330 }
331 else
332 {
333 /* Can't be a valid request because the length is incorrect. */
334 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
335 }
336 return eStatus;
337 }
338
339 #endif
340
341 #if MB_FUNC_READWRITE_HOLDING_ENABLED > 0
342
343 /**
344 * This function will request read and write holding register.
345 *
346 * @param ucSndAddr salve address
347 * @param usReadRegAddr read register start address
348 * @param usNReadRegs read register total number
349 * @param pusDataBuffer data to be written
350 * @param usWriteRegAddr write register start address
351 * @param usNWriteRegs write register total number
352 * @param lTimeOut timeout (-1 will waiting forever)
353 *
354 * @return error code
355 */
356 eMBMasterReqErrCode
eMBMasterReqReadWriteMultipleHoldingRegister(UCHAR ucSndAddr,USHORT usReadRegAddr,USHORT usNReadRegs,USHORT * pusDataBuffer,USHORT usWriteRegAddr,USHORT usNWriteRegs,LONG lTimeOut)357 eMBMasterReqReadWriteMultipleHoldingRegister( UCHAR ucSndAddr,
358 USHORT usReadRegAddr, USHORT usNReadRegs, USHORT * pusDataBuffer,
359 USHORT usWriteRegAddr, USHORT usNWriteRegs, LONG lTimeOut )
360 {
361 UCHAR *ucMBFrame;
362 USHORT usRegIndex = 0;
363 eMBMasterReqErrCode eErrStatus = MB_MRE_NO_ERR;
364
365 if ( ucSndAddr > MB_MASTER_TOTAL_SLAVE_NUM ) eErrStatus = MB_MRE_ILL_ARG;
366 else if ( xMBMasterRunResTake( lTimeOut ) == FALSE ) eErrStatus = MB_MRE_MASTER_BUSY;
367 else
368 {
369 vMBMasterGetPDUSndBuf(&ucMBFrame);
370 vMBMasterSetDestAddress(ucSndAddr);
371 ucMBFrame[MB_PDU_FUNC_OFF] = MB_FUNC_READWRITE_MULTIPLE_REGISTERS;
372 ucMBFrame[MB_PDU_REQ_READWRITE_READ_ADDR_OFF] = usReadRegAddr >> 8;
373 ucMBFrame[MB_PDU_REQ_READWRITE_READ_ADDR_OFF + 1] = usReadRegAddr;
374 ucMBFrame[MB_PDU_REQ_READWRITE_READ_REGCNT_OFF] = usNReadRegs >> 8;
375 ucMBFrame[MB_PDU_REQ_READWRITE_READ_REGCNT_OFF + 1] = usNReadRegs ;
376 ucMBFrame[MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF] = usWriteRegAddr >> 8;
377 ucMBFrame[MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF + 1] = usWriteRegAddr;
378 ucMBFrame[MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF] = usNWriteRegs >> 8;
379 ucMBFrame[MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF + 1] = usNWriteRegs ;
380 ucMBFrame[MB_PDU_REQ_READWRITE_WRITE_BYTECNT_OFF] = usNWriteRegs * 2;
381 ucMBFrame += MB_PDU_REQ_READWRITE_WRITE_VALUES_OFF;
382 while( usNWriteRegs > usRegIndex)
383 {
384 *ucMBFrame++ = pusDataBuffer[usRegIndex] >> 8;
385 *ucMBFrame++ = pusDataBuffer[usRegIndex++] ;
386 }
387 vMBMasterSetPDUSndLength( MB_PDU_SIZE_MIN + MB_PDU_REQ_READWRITE_SIZE_MIN + 2*usNWriteRegs );
388 ( void ) xMBMasterPortEventPost( EV_MASTER_FRAME_TRANSMIT );
389 eErrStatus = eMBMasterWaitRequestFinish( );
390 }
391 return eErrStatus;
392 }
393
394 eMBException
eMBMasterFuncReadWriteMultipleHoldingRegister(UCHAR * pucFrame,USHORT * usLen)395 eMBMasterFuncReadWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
396 {
397 USHORT usRegReadAddress;
398 USHORT usRegReadCount;
399 USHORT usRegWriteAddress;
400 USHORT usRegWriteCount;
401 UCHAR *ucMBFrame;
402
403 eMBException eStatus = MB_EX_NONE;
404 eMBErrorCode eRegStatus;
405
406 /* If this request is broadcast, and it's read mode. This request don't need execute. */
407 if ( xMBMasterRequestIsBroadcast() )
408 {
409 eStatus = MB_EX_NONE;
410 }
411 else if( *usLen >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READWRITE_SIZE_MIN )
412 {
413 vMBMasterGetPDUSndBuf(&ucMBFrame);
414 usRegReadAddress = ( USHORT )( ucMBFrame[MB_PDU_REQ_READWRITE_READ_ADDR_OFF] << 8U );
415 usRegReadAddress |= ( USHORT )( ucMBFrame[MB_PDU_REQ_READWRITE_READ_ADDR_OFF + 1] );
416 usRegReadAddress++;
417
418 usRegReadCount = ( USHORT )( ucMBFrame[MB_PDU_REQ_READWRITE_READ_REGCNT_OFF] << 8U );
419 usRegReadCount |= ( USHORT )( ucMBFrame[MB_PDU_REQ_READWRITE_READ_REGCNT_OFF + 1] );
420
421 usRegWriteAddress = ( USHORT )( ucMBFrame[MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF] << 8U );
422 usRegWriteAddress |= ( USHORT )( ucMBFrame[MB_PDU_REQ_READWRITE_WRITE_ADDR_OFF + 1] );
423 usRegWriteAddress++;
424
425 usRegWriteCount = ( USHORT )( ucMBFrame[MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF] << 8U );
426 usRegWriteCount |= ( USHORT )( ucMBFrame[MB_PDU_REQ_READWRITE_WRITE_REGCNT_OFF + 1] );
427
428 if( ( 2 * usRegReadCount ) == pucFrame[MB_PDU_FUNC_READWRITE_READ_BYTECNT_OFF] )
429 {
430 /* Make callback to update the register values. */
431 eRegStatus = eMBMasterRegHoldingCB( &ucMBFrame[MB_PDU_REQ_READWRITE_WRITE_VALUES_OFF],
432 usRegWriteAddress, usRegWriteCount, MB_REG_WRITE );
433
434 if( eRegStatus == MB_ENOERR )
435 {
436 /* Make the read callback. */
437 eRegStatus = eMBMasterRegHoldingCB(&pucFrame[MB_PDU_FUNC_READWRITE_READ_VALUES_OFF],
438 usRegReadAddress, usRegReadCount, MB_REG_READ);
439 }
440 if( eRegStatus != MB_ENOERR )
441 {
442 eStatus = prveMBError2Exception( eRegStatus );
443 }
444 }
445 else
446 {
447 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
448 }
449 }
450 return eStatus;
451 }
452
453 #endif
454 #endif // #if MB_MASTER_RTU_ENABLED || MB_MASTER_ASCII_ENABLED || MB_MASTER_TCP_ENABLED
455
