ModbusTCP - Modbus RTU/ASCII/TCP with lwip TCP working parti…

Users » tmav123 » Code » ModbusTCP

Athanassios Mavrogeorgiadis / Mbed 2 deprecated ModbusTCP

Modbus RTU/ASCII/TCP with lwip TCP working partial, but with errors (retransmitions)

ModBus/mbrtu.cpp@0:f54e9507171b, 2011-12-05 (annotated)

Committer:: tmav123
Date:: Mon Dec 05 22:49:02 2011 +0000
Revision:: 0:f54e9507171b

Who changed what in which revision?

User	Revision	Line number	New contents of line
tmav123	0:f54e9507171b	1	/*
tmav123	0:f54e9507171b	2	* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
tmav123	0:f54e9507171b	3	* Copyright (c) 2006 Christian Walter <wolti@sil.at>
tmav123	0:f54e9507171b	4	* All rights reserved.
tmav123	0:f54e9507171b	5	*
tmav123	0:f54e9507171b	6	* Redistribution and use in source and binary forms, with or without
tmav123	0:f54e9507171b	7	* modification, are permitted provided that the following conditions
tmav123	0:f54e9507171b	8	* are met:
tmav123	0:f54e9507171b	9	* 1. Redistributions of source code must retain the above copyright
tmav123	0:f54e9507171b	10	* notice, this list of conditions and the following disclaimer.
tmav123	0:f54e9507171b	11	* 2. Redistributions in binary form must reproduce the above copyright
tmav123	0:f54e9507171b	12	* notice, this list of conditions and the following disclaimer in the
tmav123	0:f54e9507171b	13	* documentation and/or other materials provided with the distribution.
tmav123	0:f54e9507171b	14	* 3. The name of the author may not be used to endorse or promote products
tmav123	0:f54e9507171b	15	* derived from this software without specific prior written permission.
tmav123	0:f54e9507171b	16	*
tmav123	0:f54e9507171b	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
tmav123	0:f54e9507171b	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
tmav123	0:f54e9507171b	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
tmav123	0:f54e9507171b	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
tmav123	0:f54e9507171b	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
tmav123	0:f54e9507171b	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
tmav123	0:f54e9507171b	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
tmav123	0:f54e9507171b	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
tmav123	0:f54e9507171b	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
tmav123	0:f54e9507171b	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
tmav123	0:f54e9507171b	27	*
tmav123	0:f54e9507171b	28	* File: $Id: mbrtu.c,v 1.18 2007/09/12 10:15:56 wolti Exp $
tmav123	0:f54e9507171b	29	*/
tmav123	0:f54e9507171b	30
tmav123	0:f54e9507171b	31	/* ----------------------- System includes ----------------------------------*/
tmav123	0:f54e9507171b	32	#include "stdlib.h"
tmav123	0:f54e9507171b	33	#include "string.h"
tmav123	0:f54e9507171b	34
tmav123	0:f54e9507171b	35	/* ----------------------- Platform includes --------------------------------*/
tmav123	0:f54e9507171b	36	#include "port.h"
tmav123	0:f54e9507171b	37
tmav123	0:f54e9507171b	38	/* ----------------------- Modbus includes ----------------------------------*/
tmav123	0:f54e9507171b	39	#include "mb.h"
tmav123	0:f54e9507171b	40	#include "mbrtu.h"
tmav123	0:f54e9507171b	41	#include "mbframe.h"
tmav123	0:f54e9507171b	42
tmav123	0:f54e9507171b	43	#include "mbcrc.h"
tmav123	0:f54e9507171b	44	#include "mbport.h"
tmav123	0:f54e9507171b	45
tmav123	0:f54e9507171b	46	/* ----------------------- Defines ------------------------------------------*/
tmav123	0:f54e9507171b	47	#define MB_SER_PDU_SIZE_MIN 4 /!< Minimum size of a Modbus RTU frame. /
tmav123	0:f54e9507171b	48	#define MB_SER_PDU_SIZE_MAX 256 /!< Maximum size of a Modbus RTU frame. /
tmav123	0:f54e9507171b	49	#define MB_SER_PDU_SIZE_CRC 2 /!< Size of CRC field in PDU. /
tmav123	0:f54e9507171b	50	#define MB_SER_PDU_ADDR_OFF 0 /!< Offset of slave address in Ser-PDU. /
tmav123	0:f54e9507171b	51	#define MB_SER_PDU_PDU_OFF 1 /!< Offset of Modbus-PDU in Ser-PDU. /
tmav123	0:f54e9507171b	52
tmav123	0:f54e9507171b	53	/* ----------------------- Type definitions ---------------------------------*/
tmav123	0:f54e9507171b	54	typedef enum
tmav123	0:f54e9507171b	55	{
tmav123	0:f54e9507171b	56	STATE_RX_INIT, /!< Receiver is in initial state. /
tmav123	0:f54e9507171b	57	STATE_RX_IDLE, /!< Receiver is in idle state. /
tmav123	0:f54e9507171b	58	STATE_RX_RCV, /!< Frame is beeing received. /
tmav123	0:f54e9507171b	59	STATE_RX_ERROR /!< If the frame is invalid. /
tmav123	0:f54e9507171b	60	} eMBRcvState;
tmav123	0:f54e9507171b	61
tmav123	0:f54e9507171b	62	typedef enum
tmav123	0:f54e9507171b	63	{
tmav123	0:f54e9507171b	64	STATE_TX_IDLE, /!< Transmitter is in idle state. /
tmav123	0:f54e9507171b	65	STATE_TX_XMIT /!< Transmitter is in transfer state. /
tmav123	0:f54e9507171b	66	} eMBSndState;
tmav123	0:f54e9507171b	67
tmav123	0:f54e9507171b	68	/* ----------------------- Static variables ---------------------------------*/
tmav123	0:f54e9507171b	69	static volatile eMBSndState eSndState;
tmav123	0:f54e9507171b	70	static volatile eMBRcvState eRcvState;
tmav123	0:f54e9507171b	71
tmav123	0:f54e9507171b	72	volatile UCHAR ucRTUBuf[MB_SER_PDU_SIZE_MAX];
tmav123	0:f54e9507171b	73
tmav123	0:f54e9507171b	74	static volatile UCHAR *pucSndBufferCur;
tmav123	0:f54e9507171b	75	static volatile USHORT usSndBufferCount;
tmav123	0:f54e9507171b	76
tmav123	0:f54e9507171b	77	static volatile USHORT usRcvBufferPos;
tmav123	0:f54e9507171b	78
tmav123	0:f54e9507171b	79	/* ----------------------- Start implementation -----------------------------*/
tmav123	0:f54e9507171b	80	eMBErrorCode
tmav123	0:f54e9507171b	81	eMBRTUInit( UCHAR ucSlaveAddress, UCHAR ucPort, ULONG ulBaudRate, eMBParity eParity )
tmav123	0:f54e9507171b	82	{
tmav123	0:f54e9507171b	83	eMBErrorCode eStatus = MB_ENOERR;
tmav123	0:f54e9507171b	84	ULONG usTimerT35_50us;
tmav123	0:f54e9507171b	85
tmav123	0:f54e9507171b	86	( void )ucSlaveAddress;
tmav123	0:f54e9507171b	87	ENTER_CRITICAL_SECTION( );
tmav123	0:f54e9507171b	88
tmav123	0:f54e9507171b	89	/* Modbus RTU uses 8 Databits. */
tmav123	0:f54e9507171b	90	if( xMBPortSerialInit( ucPort, ulBaudRate, 8, eParity ) != TRUE )
tmav123	0:f54e9507171b	91	{
tmav123	0:f54e9507171b	92	eStatus = MB_EPORTERR;
tmav123	0:f54e9507171b	93	}
tmav123	0:f54e9507171b	94	else
tmav123	0:f54e9507171b	95	{
tmav123	0:f54e9507171b	96	/* If baudrate > 19200 then we should use the fixed timer values
tmav123	0:f54e9507171b	97	* t35 = 1750us. Otherwise t35 must be 3.5 times the character time.
tmav123	0:f54e9507171b	98	*/
tmav123	0:f54e9507171b	99	if( ulBaudRate > 19200 )
tmav123	0:f54e9507171b	100	{
tmav123	0:f54e9507171b	101	usTimerT35_50us = 35; /* 1800us. */
tmav123	0:f54e9507171b	102	}
tmav123	0:f54e9507171b	103	else
tmav123	0:f54e9507171b	104	{
tmav123	0:f54e9507171b	105	/* The timer reload value for a character is given by:
tmav123	0:f54e9507171b	106	*
tmav123	0:f54e9507171b	107	* ChTimeValue = Ticks_per_1s / ( Baudrate / 11 )
tmav123	0:f54e9507171b	108	* = 11 * Ticks_per_1s / Baudrate
tmav123	0:f54e9507171b	109	* = 220000 / Baudrate
tmav123	0:f54e9507171b	110	* The reload for t3.5 is 1.5 times this value and similary
tmav123	0:f54e9507171b	111	* for t3.5.
tmav123	0:f54e9507171b	112	*/
tmav123	0:f54e9507171b	113	usTimerT35_50us = ( 7UL * 220000UL ) / ( 2UL * ulBaudRate );
tmav123	0:f54e9507171b	114	}
tmav123	0:f54e9507171b	115	if( xMBPortTimersInit( ( USHORT ) usTimerT35_50us ) != TRUE )
tmav123	0:f54e9507171b	116	{
tmav123	0:f54e9507171b	117	eStatus = MB_EPORTERR;
tmav123	0:f54e9507171b	118	}
tmav123	0:f54e9507171b	119	}
tmav123	0:f54e9507171b	120	EXIT_CRITICAL_SECTION( );
tmav123	0:f54e9507171b	121
tmav123	0:f54e9507171b	122	return eStatus;
tmav123	0:f54e9507171b	123	}
tmav123	0:f54e9507171b	124
tmav123	0:f54e9507171b	125	void
tmav123	0:f54e9507171b	126	eMBRTUStart( void )
tmav123	0:f54e9507171b	127	{
tmav123	0:f54e9507171b	128	ENTER_CRITICAL_SECTION( );
tmav123	0:f54e9507171b	129	/* Initially the receiver is in the state STATE_RX_INIT. we start
tmav123	0:f54e9507171b	130	* the timer and if no character is received within t3.5 we change
tmav123	0:f54e9507171b	131	* to STATE_RX_IDLE. This makes sure that we delay startup of the
tmav123	0:f54e9507171b	132	* modbus protocol stack until the bus is free.
tmav123	0:f54e9507171b	133	*/
tmav123	0:f54e9507171b	134	eRcvState = STATE_RX_INIT;
tmav123	0:f54e9507171b	135	vMBPortSerialEnable( TRUE, FALSE );
tmav123	0:f54e9507171b	136	vMBPortTimersEnable( );
tmav123	0:f54e9507171b	137	EXIT_CRITICAL_SECTION( );
tmav123	0:f54e9507171b	138	}
tmav123	0:f54e9507171b	139
tmav123	0:f54e9507171b	140	void
tmav123	0:f54e9507171b	141	eMBRTUStop( void )
tmav123	0:f54e9507171b	142	{
tmav123	0:f54e9507171b	143	ENTER_CRITICAL_SECTION( );
tmav123	0:f54e9507171b	144	vMBPortSerialEnable( FALSE, FALSE );
tmav123	0:f54e9507171b	145	vMBPortTimersDisable( );
tmav123	0:f54e9507171b	146	EXIT_CRITICAL_SECTION( );
tmav123	0:f54e9507171b	147	}
tmav123	0:f54e9507171b	148
tmav123	0:f54e9507171b	149	eMBErrorCode
tmav123	0:f54e9507171b	150	eMBRTUReceive( UCHAR * pucRcvAddress, UCHAR ** pucFrame, USHORT * pusLength )
tmav123	0:f54e9507171b	151	{
tmav123	0:f54e9507171b	152	BOOL xFrameReceived = FALSE;
tmav123	0:f54e9507171b	153	eMBErrorCode eStatus = MB_ENOERR;
tmav123	0:f54e9507171b	154
tmav123	0:f54e9507171b	155	ENTER_CRITICAL_SECTION( );
tmav123	0:f54e9507171b	156	assert( usRcvBufferPos < MB_SER_PDU_SIZE_MAX );
tmav123	0:f54e9507171b	157
tmav123	0:f54e9507171b	158	/* Length and CRC check */
tmav123	0:f54e9507171b	159	if( ( usRcvBufferPos >= MB_SER_PDU_SIZE_MIN )
tmav123	0:f54e9507171b	160	&& ( usMBCRC16( ( UCHAR * ) ucRTUBuf, usRcvBufferPos ) == 0 ) )
tmav123	0:f54e9507171b	161	{
tmav123	0:f54e9507171b	162	/* Save the address field. All frames are passed to the upper layer
tmav123	0:f54e9507171b	163	* and the decision if a frame is used is done there.
tmav123	0:f54e9507171b	164	*/
tmav123	0:f54e9507171b	165	*pucRcvAddress = ucRTUBuf[MB_SER_PDU_ADDR_OFF];
tmav123	0:f54e9507171b	166
tmav123	0:f54e9507171b	167	/* Total length of Modbus-PDU is Modbus-Serial-Line-PDU minus
tmav123	0:f54e9507171b	168	* size of address field and CRC checksum.
tmav123	0:f54e9507171b	169	*/
tmav123	0:f54e9507171b	170	*pusLength = ( USHORT )( usRcvBufferPos - MB_SER_PDU_PDU_OFF - MB_SER_PDU_SIZE_CRC );
tmav123	0:f54e9507171b	171
tmav123	0:f54e9507171b	172	/* Return the start of the Modbus PDU to the caller. */
tmav123	0:f54e9507171b	173	pucFrame = ( UCHAR ) & ucRTUBuf[MB_SER_PDU_PDU_OFF];
tmav123	0:f54e9507171b	174	xFrameReceived = TRUE;
tmav123	0:f54e9507171b	175
tmav123	0:f54e9507171b	176	// Added by Cam
tmav123	0:f54e9507171b	177	// Now that the poll routine knows about the received frame,
tmav123	0:f54e9507171b	178	// clear the receive buffer position ready for the next frame received
tmav123	0:f54e9507171b	179	usRcvBufferPos = 0;
tmav123	0:f54e9507171b	180
tmav123	0:f54e9507171b	181	}
tmav123	0:f54e9507171b	182	else
tmav123	0:f54e9507171b	183	{
tmav123	0:f54e9507171b	184	eStatus = MB_EIO;
tmav123	0:f54e9507171b	185	}
tmav123	0:f54e9507171b	186
tmav123	0:f54e9507171b	187	EXIT_CRITICAL_SECTION( );
tmav123	0:f54e9507171b	188	return eStatus;
tmav123	0:f54e9507171b	189	}
tmav123	0:f54e9507171b	190
tmav123	0:f54e9507171b	191	eMBErrorCode
tmav123	0:f54e9507171b	192	eMBRTUSend( UCHAR ucSlaveAddress, const UCHAR * pucFrame, USHORT usLength )
tmav123	0:f54e9507171b	193	{
tmav123	0:f54e9507171b	194	eMBErrorCode eStatus = MB_ENOERR;
tmav123	0:f54e9507171b	195	USHORT usCRC16;
tmav123	0:f54e9507171b	196
tmav123	0:f54e9507171b	197	ENTER_CRITICAL_SECTION( );
tmav123	0:f54e9507171b	198
tmav123	0:f54e9507171b	199	/* Check if the receiver is still in idle state. If not we where to
tmav123	0:f54e9507171b	200	* slow with processing the received frame and the master sent another
tmav123	0:f54e9507171b	201	* frame on the network. We have to abort sending the frame.
tmav123	0:f54e9507171b	202	*/
tmav123	0:f54e9507171b	203	if( eRcvState == STATE_RX_IDLE )
tmav123	0:f54e9507171b	204	{
tmav123	0:f54e9507171b	205	/* First byte before the Modbus-PDU is the slave address. */
tmav123	0:f54e9507171b	206	pucSndBufferCur = ( UCHAR * ) pucFrame - 1;
tmav123	0:f54e9507171b	207	usSndBufferCount = 1;
tmav123	0:f54e9507171b	208
tmav123	0:f54e9507171b	209	/* Now copy the Modbus-PDU into the Modbus-Serial-Line-PDU. */
tmav123	0:f54e9507171b	210	pucSndBufferCur[MB_SER_PDU_ADDR_OFF] = ucSlaveAddress;
tmav123	0:f54e9507171b	211	usSndBufferCount += usLength;
tmav123	0:f54e9507171b	212
tmav123	0:f54e9507171b	213	/* Calculate CRC16 checksum for Modbus-Serial-Line-PDU. */
tmav123	0:f54e9507171b	214	usCRC16 = usMBCRC16( ( UCHAR * ) pucSndBufferCur, usSndBufferCount );
tmav123	0:f54e9507171b	215	ucRTUBuf[usSndBufferCount++] = ( UCHAR )( usCRC16 & 0xFF );
tmav123	0:f54e9507171b	216	ucRTUBuf[usSndBufferCount++] = ( UCHAR )( usCRC16 >> 8 );
tmav123	0:f54e9507171b	217
tmav123	0:f54e9507171b	218	/* Activate the transmitter. */
tmav123	0:f54e9507171b	219	eSndState = STATE_TX_XMIT;
tmav123	0:f54e9507171b	220	vMBPortSerialEnable( FALSE, TRUE );
tmav123	0:f54e9507171b	221	}
tmav123	0:f54e9507171b	222	else
tmav123	0:f54e9507171b	223	{
tmav123	0:f54e9507171b	224	eStatus = MB_EIO;
tmav123	0:f54e9507171b	225	}
tmav123	0:f54e9507171b	226	EXIT_CRITICAL_SECTION( );
tmav123	0:f54e9507171b	227	return eStatus;
tmav123	0:f54e9507171b	228	}
tmav123	0:f54e9507171b	229
tmav123	0:f54e9507171b	230	BOOL
tmav123	0:f54e9507171b	231	xMBRTUReceiveFSM( void )
tmav123	0:f54e9507171b	232	{
tmav123	0:f54e9507171b	233	BOOL xTaskNeedSwitch = FALSE;
tmav123	0:f54e9507171b	234	UCHAR ucByte;
tmav123	0:f54e9507171b	235
tmav123	0:f54e9507171b	236	assert( eSndState == STATE_TX_IDLE );
tmav123	0:f54e9507171b	237
tmav123	0:f54e9507171b	238	/* Always read the character. */
tmav123	0:f54e9507171b	239	( void )xMBPortSerialGetByte( ( CHAR * ) & ucByte );
tmav123	0:f54e9507171b	240
tmav123	0:f54e9507171b	241	switch ( eRcvState )
tmav123	0:f54e9507171b	242	{
tmav123	0:f54e9507171b	243	/* If we have received a character in the init state we have to
tmav123	0:f54e9507171b	244	* wait until the frame is finished.
tmav123	0:f54e9507171b	245	*/
tmav123	0:f54e9507171b	246	case STATE_RX_INIT:
tmav123	0:f54e9507171b	247	vMBPortTimersEnable( );
tmav123	0:f54e9507171b	248	break;
tmav123	0:f54e9507171b	249
tmav123	0:f54e9507171b	250	/* In the error state we wait until all characters in the
tmav123	0:f54e9507171b	251	* damaged frame are transmitted.
tmav123	0:f54e9507171b	252	*/
tmav123	0:f54e9507171b	253	case STATE_RX_ERROR:
tmav123	0:f54e9507171b	254	vMBPortTimersEnable( );
tmav123	0:f54e9507171b	255	break;
tmav123	0:f54e9507171b	256
tmav123	0:f54e9507171b	257	/* In the idle state we wait for a new character. If a character
tmav123	0:f54e9507171b	258	* is received the t1.5 and t3.5 timers are started and the
tmav123	0:f54e9507171b	259	* receiver is in the state STATE_RX_RECEIVE.
tmav123	0:f54e9507171b	260	*/
tmav123	0:f54e9507171b	261	case STATE_RX_IDLE:
tmav123	0:f54e9507171b	262	ucRTUBuf[usRcvBufferPos++] = ucByte;
tmav123	0:f54e9507171b	263	eRcvState = STATE_RX_RCV;
tmav123	0:f54e9507171b	264
tmav123	0:f54e9507171b	265	/* Enable t3.5 timers. */
tmav123	0:f54e9507171b	266	vMBPortTimersEnable( );
tmav123	0:f54e9507171b	267	break;
tmav123	0:f54e9507171b	268
tmav123	0:f54e9507171b	269	/* We are currently receiving a frame. Reset the timer after
tmav123	0:f54e9507171b	270	* every character received. If more than the maximum possible
tmav123	0:f54e9507171b	271	* number of bytes in a modbus frame is received the frame is
tmav123	0:f54e9507171b	272	* ignored.
tmav123	0:f54e9507171b	273	*/
tmav123	0:f54e9507171b	274	case STATE_RX_RCV:
tmav123	0:f54e9507171b	275	if( usRcvBufferPos < MB_SER_PDU_SIZE_MAX )
tmav123	0:f54e9507171b	276	{
tmav123	0:f54e9507171b	277	ucRTUBuf[usRcvBufferPos++] = ucByte;
tmav123	0:f54e9507171b	278	}
tmav123	0:f54e9507171b	279	else
tmav123	0:f54e9507171b	280	{
tmav123	0:f54e9507171b	281	eRcvState = STATE_RX_ERROR;
tmav123	0:f54e9507171b	282	}
tmav123	0:f54e9507171b	283	vMBPortTimersEnable( );
tmav123	0:f54e9507171b	284	break;
tmav123	0:f54e9507171b	285	}
tmav123	0:f54e9507171b	286	return xTaskNeedSwitch;
tmav123	0:f54e9507171b	287	}
tmav123	0:f54e9507171b	288
tmav123	0:f54e9507171b	289	BOOL
tmav123	0:f54e9507171b	290	xMBRTUTransmitFSM( void )
tmav123	0:f54e9507171b	291	{
tmav123	0:f54e9507171b	292	BOOL xNeedPoll = FALSE;
tmav123	0:f54e9507171b	293
tmav123	0:f54e9507171b	294	assert( eRcvState == STATE_RX_IDLE );
tmav123	0:f54e9507171b	295	switch ( eSndState )
tmav123	0:f54e9507171b	296	{
tmav123	0:f54e9507171b	297	/* We should not get a transmitter event if the transmitter is in
tmav123	0:f54e9507171b	298	* idle state. */
tmav123	0:f54e9507171b	299	case STATE_TX_IDLE:
tmav123	0:f54e9507171b	300	/* enable receiver/disable transmitter. */
tmav123	0:f54e9507171b	301	vMBPortSerialEnable( TRUE, FALSE );
tmav123	0:f54e9507171b	302	break;
tmav123	0:f54e9507171b	303
tmav123	0:f54e9507171b	304	case STATE_TX_XMIT:
tmav123	0:f54e9507171b	305	/* check if we are finished. */
tmav123	0:f54e9507171b	306	if( usSndBufferCount != 0 )
tmav123	0:f54e9507171b	307	{
tmav123	0:f54e9507171b	308	xMBPortSerialPutByte( ( CHAR )*pucSndBufferCur );
tmav123	0:f54e9507171b	309	pucSndBufferCur++; /* next byte in sendbuffer. */
tmav123	0:f54e9507171b	310	usSndBufferCount--;
tmav123	0:f54e9507171b	311	}
tmav123	0:f54e9507171b	312	else
tmav123	0:f54e9507171b	313	{
tmav123	0:f54e9507171b	314	xNeedPoll = xMBPortEventPost( EV_FRAME_SENT );
tmav123	0:f54e9507171b	315	/* Disable transmitter. This prevents another transmit buffer
tmav123	0:f54e9507171b	316	* empty interrupt. */
tmav123	0:f54e9507171b	317	vMBPortSerialEnable( TRUE, FALSE );
tmav123	0:f54e9507171b	318	eSndState = STATE_TX_IDLE;
tmav123	0:f54e9507171b	319	}
tmav123	0:f54e9507171b	320	break;
tmav123	0:f54e9507171b	321	}
tmav123	0:f54e9507171b	322
tmav123	0:f54e9507171b	323	return xNeedPoll;
tmav123	0:f54e9507171b	324	}
tmav123	0:f54e9507171b	325
tmav123	0:f54e9507171b	326	BOOL
tmav123	0:f54e9507171b	327	xMBRTUTimerT35Expired( void )
tmav123	0:f54e9507171b	328	{
tmav123	0:f54e9507171b	329	BOOL xNeedPoll = FALSE;
tmav123	0:f54e9507171b	330
tmav123	0:f54e9507171b	331	switch ( eRcvState )
tmav123	0:f54e9507171b	332	{
tmav123	0:f54e9507171b	333	/* Timer t35 expired. Startup phase is finished. */
tmav123	0:f54e9507171b	334	case STATE_RX_INIT:
tmav123	0:f54e9507171b	335	xNeedPoll = xMBPortEventPost( EV_READY );
tmav123	0:f54e9507171b	336	break;
tmav123	0:f54e9507171b	337
tmav123	0:f54e9507171b	338	/* A frame was received and t35 expired. Notify the listener that
tmav123	0:f54e9507171b	339	* a new frame was received. */
tmav123	0:f54e9507171b	340	case STATE_RX_RCV:
tmav123	0:f54e9507171b	341	xNeedPoll = xMBPortEventPost( EV_FRAME_RECEIVED );
tmav123	0:f54e9507171b	342	break;
tmav123	0:f54e9507171b	343
tmav123	0:f54e9507171b	344	/* An error occured while receiving the frame. */
tmav123	0:f54e9507171b	345	case STATE_RX_ERROR:
tmav123	0:f54e9507171b	346	break;
tmav123	0:f54e9507171b	347
tmav123	0:f54e9507171b	348	/* Function called in an illegal state. */
tmav123	0:f54e9507171b	349	default:
tmav123	0:f54e9507171b	350	assert( ( eRcvState == STATE_RX_INIT ) \|\|
tmav123	0:f54e9507171b	351	( eRcvState == STATE_RX_RCV ) \|\| ( eRcvState == STATE_RX_ERROR ) );
tmav123	0:f54e9507171b	352	}
tmav123	0:f54e9507171b	353
tmav123	0:f54e9507171b	354	vMBPortTimersDisable( );
tmav123	0:f54e9507171b	355	eRcvState = STATE_RX_IDLE;
tmav123	0:f54e9507171b	356
tmav123	0:f54e9507171b	357	return xNeedPoll;
tmav123	0:f54e9507171b	358	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	05 Dec 2011
Imports:	271
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	2
Followers:	17

ModBus/mbrtu.cpp@0:f54e9507171b, 2011-12-05 (annotated)

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