Modbus-Slave - Forking https://os.mbed.com/users/cam/code/Modbus…

Users » danielmckinnell » Code » 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.

mbfuncdisc.cpp@0:0453a0a7e500, 2010-04-15 (annotated)

Committer:: cam
Date:: Thu Apr 15 12:10:34 2010 +0000
Revision:: 0:0453a0a7e500

Who changed what in which revision?

User	Revision	Line number	New contents of line
cam	0:0453a0a7e500	1	/*
cam	0:0453a0a7e500	2	* FreeRTOS Modbus Libary: A Modbus serial implementation for FreeRTOS
cam	0:0453a0a7e500	3	* Copyright (C) 2006 Christian Walter <wolti@sil.at>
cam	0:0453a0a7e500	4	*
cam	0:0453a0a7e500	5	* This library is free software; you can redistribute it and/or
cam	0:0453a0a7e500	6	* modify it under the terms of the GNU Lesser General Public
cam	0:0453a0a7e500	7	* License as published by the Free Software Foundation; either
cam	0:0453a0a7e500	8	* version 2.1 of the License, or (at your option) any later version.
cam	0:0453a0a7e500	9	*
cam	0:0453a0a7e500	10	* This library is distributed in the hope that it will be useful,
cam	0:0453a0a7e500	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
cam	0:0453a0a7e500	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
cam	0:0453a0a7e500	13	* Lesser General Public License for more details.
cam	0:0453a0a7e500	14	*
cam	0:0453a0a7e500	15	* You should have received a copy of the GNU Lesser General Public
cam	0:0453a0a7e500	16	* License along with this library; if not, write to the Free Software
cam	0:0453a0a7e500	17	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
cam	0:0453a0a7e500	18	*/
cam	0:0453a0a7e500	19
cam	0:0453a0a7e500	20
cam	0:0453a0a7e500	21
cam	0:0453a0a7e500	22	/* ----------------------- System includes ----------------------------------*/
cam	0:0453a0a7e500	23	#include "stdlib.h"
cam	0:0453a0a7e500	24	#include "string.h"
cam	0:0453a0a7e500	25
cam	0:0453a0a7e500	26	/* ----------------------- Platform includes --------------------------------*/
cam	0:0453a0a7e500	27	#include "port.h"
cam	0:0453a0a7e500	28
cam	0:0453a0a7e500	29	/* ----------------------- Modbus includes ----------------------------------*/
cam	0:0453a0a7e500	30	#include "mb.h"
cam	0:0453a0a7e500	31	#include "mbframe.h"
cam	0:0453a0a7e500	32	#include "mbproto.h"
cam	0:0453a0a7e500	33	#include "mbconfig.h"
cam	0:0453a0a7e500	34
cam	0:0453a0a7e500	35	/* ----------------------- Defines ------------------------------------------*/
cam	0:0453a0a7e500	36	#define MB_PDU_FUNC_READ_ADDR_OFF ( MB_PDU_DATA_OFF )
cam	0:0453a0a7e500	37	#define MB_PDU_FUNC_READ_DISCCNT_OFF ( MB_PDU_DATA_OFF + 2 )
cam	0:0453a0a7e500	38	#define MB_PDU_FUNC_READ_SIZE ( 4 )
cam	0:0453a0a7e500	39	#define MB_PDU_FUNC_READ_DISCCNT_MAX ( 0x07D0 )
cam	0:0453a0a7e500	40
cam	0:0453a0a7e500	41	/* ----------------------- Static functions ---------------------------------*/
cam	0:0453a0a7e500	42	eMBException prveMBError2Exception( eMBErrorCode eErrorCode );
cam	0:0453a0a7e500	43
cam	0:0453a0a7e500	44	/* ----------------------- Start implementation -----------------------------*/
cam	0:0453a0a7e500	45
cam	0:0453a0a7e500	46	#if MB_FUNC_READ_COILS_ENABLED > 0
cam	0:0453a0a7e500	47
cam	0:0453a0a7e500	48	eMBException
cam	0:0453a0a7e500	49	eMBFuncReadDiscreteInputs( UCHAR * pucFrame, USHORT * usLen )
cam	0:0453a0a7e500	50	{
cam	0:0453a0a7e500	51	USHORT usRegAddress;
cam	0:0453a0a7e500	52	USHORT usDiscreteCnt;
cam	0:0453a0a7e500	53	UCHAR ucNBytes;
cam	0:0453a0a7e500	54	UCHAR *pucFrameCur;
cam	0:0453a0a7e500	55
cam	0:0453a0a7e500	56	eMBException eStatus = MB_EX_NONE;
cam	0:0453a0a7e500	57	eMBErrorCode eRegStatus;
cam	0:0453a0a7e500	58
cam	0:0453a0a7e500	59	if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) )
cam	0:0453a0a7e500	60	{
cam	0:0453a0a7e500	61	usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 );
cam	0:0453a0a7e500	62	usRegAddress \|= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] );
cam	0:0453a0a7e500	63	usRegAddress++;
cam	0:0453a0a7e500	64
cam	0:0453a0a7e500	65	usDiscreteCnt = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_DISCCNT_OFF] << 8 );
cam	0:0453a0a7e500	66	usDiscreteCnt \|= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_DISCCNT_OFF + 1] );
cam	0:0453a0a7e500	67
cam	0:0453a0a7e500	68	/* Check if the number of registers to read is valid. If not
cam	0:0453a0a7e500	69	* return Modbus illegal data value exception.
cam	0:0453a0a7e500	70	*/
cam	0:0453a0a7e500	71	if( ( usDiscreteCnt >= 1 ) &&
cam	0:0453a0a7e500	72	( usDiscreteCnt < MB_PDU_FUNC_READ_DISCCNT_MAX ) )
cam	0:0453a0a7e500	73	{
cam	0:0453a0a7e500	74	/* Set the current PDU data pointer to the beginning. */
cam	0:0453a0a7e500	75	pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF];
cam	0:0453a0a7e500	76	*usLen = MB_PDU_FUNC_OFF;
cam	0:0453a0a7e500	77
cam	0:0453a0a7e500	78	/* First byte contains the function code. */
cam	0:0453a0a7e500	79	*pucFrameCur++ = MB_FUNC_READ_DISCRETE_INPUTS;
cam	0:0453a0a7e500	80	*usLen += 1;
cam	0:0453a0a7e500	81
cam	0:0453a0a7e500	82	/* Test if the quantity of coils is a multiple of 8. If not last
cam	0:0453a0a7e500	83	* byte is only partially field with unused coils set to zero. */
cam	0:0453a0a7e500	84	if( ( usDiscreteCnt & 0x0007 ) != 0 )
cam	0:0453a0a7e500	85	{
cam	0:0453a0a7e500	86	ucNBytes = ( UCHAR ) ( usDiscreteCnt / 8 + 1 );
cam	0:0453a0a7e500	87	}
cam	0:0453a0a7e500	88	else
cam	0:0453a0a7e500	89	{
cam	0:0453a0a7e500	90	ucNBytes = ( UCHAR ) ( usDiscreteCnt / 8 );
cam	0:0453a0a7e500	91	}
cam	0:0453a0a7e500	92	*pucFrameCur++ = ucNBytes;
cam	0:0453a0a7e500	93	*usLen += 1;
cam	0:0453a0a7e500	94
cam	0:0453a0a7e500	95	eRegStatus =
cam	0:0453a0a7e500	96	eMBRegDiscreteCB( pucFrameCur, usRegAddress, usDiscreteCnt );
cam	0:0453a0a7e500	97
cam	0:0453a0a7e500	98	/* If an error occured convert it into a Modbus exception. */
cam	0:0453a0a7e500	99	if( eRegStatus != MB_ENOERR )
cam	0:0453a0a7e500	100	{
cam	0:0453a0a7e500	101	eStatus = prveMBError2Exception( eRegStatus );
cam	0:0453a0a7e500	102	}
cam	0:0453a0a7e500	103	else
cam	0:0453a0a7e500	104	{
cam	0:0453a0a7e500	105	/* The response contains the function code, the starting address
cam	0:0453a0a7e500	106	* and the quantity of registers. We reuse the old values in the
cam	0:0453a0a7e500	107	* buffer because they are still valid. */
cam	0:0453a0a7e500	108	*usLen += ucNBytes;;
cam	0:0453a0a7e500	109	}
cam	0:0453a0a7e500	110	}
cam	0:0453a0a7e500	111	else
cam	0:0453a0a7e500	112	{
cam	0:0453a0a7e500	113	eStatus = MB_EX_ILLEGAL_DATA_VALUE;
cam	0:0453a0a7e500	114	}
cam	0:0453a0a7e500	115	}
cam	0:0453a0a7e500	116	else
cam	0:0453a0a7e500	117	{
cam	0:0453a0a7e500	118	/* Can't be a valid read coil register request because the length
cam	0:0453a0a7e500	119	* is incorrect. */
cam	0:0453a0a7e500	120	eStatus = MB_EX_ILLEGAL_DATA_VALUE;
cam	0:0453a0a7e500	121	}
cam	0:0453a0a7e500	122	return eStatus;
cam	0:0453a0a7e500	123	}
cam	0:0453a0a7e500	124
cam	0:0453a0a7e500	125	#endif

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Type:	Library
Created:	03 Dec 2019
Imports:	21
Forks:	0
Commits:	5
Dependents:	0
Dependencies:	0
Followers:	2

mbfuncdisc.cpp@0:0453a0a7e500, 2010-04-15 (annotated)

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