Modbus - Trying to make Modbus code into a lib

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Matthew Waddilove / Mbed 2 deprecated Modbus

Trying to make Modbus code into a lib

mbrtu.cpp@0:274eb57e1df3, 2010-08-22 (annotated)

Committer:: giryan
Date:: Sun Aug 22 16:34:20 2010 +0000
Revision:: 0:274eb57e1df3

Who changed what in which revision?

User	Revision	Line number	New contents of line
giryan	0:274eb57e1df3	1	/*
giryan	0:274eb57e1df3	2	* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
giryan	0:274eb57e1df3	3	* Copyright (c) 2006 Christian Walter <wolti@sil.at>
giryan	0:274eb57e1df3	4	* All rights reserved.
giryan	0:274eb57e1df3	5	*
giryan	0:274eb57e1df3	6	* Redistribution and use in source and binary forms, with or without
giryan	0:274eb57e1df3	7	* modification, are permitted provided that the following conditions
giryan	0:274eb57e1df3	8	* are met:
giryan	0:274eb57e1df3	9	* 1. Redistributions of source code must retain the above copyright
giryan	0:274eb57e1df3	10	* notice, this list of conditions and the following disclaimer.
giryan	0:274eb57e1df3	11	* 2. Redistributions in binary form must reproduce the above copyright
giryan	0:274eb57e1df3	12	* notice, this list of conditions and the following disclaimer in the
giryan	0:274eb57e1df3	13	* documentation and/or other materials provided with the distribution.
giryan	0:274eb57e1df3	14	* 3. The name of the author may not be used to endorse or promote products
giryan	0:274eb57e1df3	15	* derived from this software without specific prior written permission.
giryan	0:274eb57e1df3	16	*
giryan	0:274eb57e1df3	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
giryan	0:274eb57e1df3	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
giryan	0:274eb57e1df3	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
giryan	0:274eb57e1df3	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
giryan	0:274eb57e1df3	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
giryan	0:274eb57e1df3	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
giryan	0:274eb57e1df3	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
giryan	0:274eb57e1df3	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
giryan	0:274eb57e1df3	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
giryan	0:274eb57e1df3	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
giryan	0:274eb57e1df3	27	*
giryan	0:274eb57e1df3	28	* File: $Id: mbrtu.c,v 1.18 2007/09/12 10:15:56 wolti Exp $
giryan	0:274eb57e1df3	29	*/
giryan	0:274eb57e1df3	30
giryan	0:274eb57e1df3	31	/* ----------------------- System includes ----------------------------------*/
giryan	0:274eb57e1df3	32	#include "stdlib.h"
giryan	0:274eb57e1df3	33	#include "string.h"
giryan	0:274eb57e1df3	34
giryan	0:274eb57e1df3	35	/* ----------------------- Platform includes --------------------------------*/
giryan	0:274eb57e1df3	36	#include "port.h"
giryan	0:274eb57e1df3	37
giryan	0:274eb57e1df3	38	/* ----------------------- Modbus includes ----------------------------------*/
giryan	0:274eb57e1df3	39	#include "mb.h"
giryan	0:274eb57e1df3	40	#include "mbrtu.h"
giryan	0:274eb57e1df3	41	#include "mbframe.h"
giryan	0:274eb57e1df3	42
giryan	0:274eb57e1df3	43	#include "mbcrc.h"
giryan	0:274eb57e1df3	44	#include "mbport.h"
giryan	0:274eb57e1df3	45
giryan	0:274eb57e1df3	46	/* ----------------------- Defines ------------------------------------------*/
giryan	0:274eb57e1df3	47	#define MB_SER_PDU_SIZE_MIN 4 /!< Minimum size of a Modbus RTU frame. /
giryan	0:274eb57e1df3	48	#define MB_SER_PDU_SIZE_MAX 256 /!< Maximum size of a Modbus RTU frame. /
giryan	0:274eb57e1df3	49	#define MB_SER_PDU_SIZE_CRC 2 /!< Size of CRC field in PDU. /
giryan	0:274eb57e1df3	50	#define MB_SER_PDU_ADDR_OFF 0 /!< Offset of slave address in Ser-PDU. /
giryan	0:274eb57e1df3	51	#define MB_SER_PDU_PDU_OFF 1 /!< Offset of Modbus-PDU in Ser-PDU. /
giryan	0:274eb57e1df3	52
giryan	0:274eb57e1df3	53	/* ----------------------- Type definitions ---------------------------------*/
giryan	0:274eb57e1df3	54	typedef enum
giryan	0:274eb57e1df3	55	{
giryan	0:274eb57e1df3	56	STATE_RX_INIT, /!< Receiver is in initial state. /
giryan	0:274eb57e1df3	57	STATE_RX_IDLE, /!< Receiver is in idle state. /
giryan	0:274eb57e1df3	58	STATE_RX_RCV, /!< Frame is beeing received. /
giryan	0:274eb57e1df3	59	STATE_RX_ERROR /!< If the frame is invalid. /
giryan	0:274eb57e1df3	60	} eMBRcvState;
giryan	0:274eb57e1df3	61
giryan	0:274eb57e1df3	62	typedef enum
giryan	0:274eb57e1df3	63	{
giryan	0:274eb57e1df3	64	STATE_TX_IDLE, /!< Transmitter is in idle state. /
giryan	0:274eb57e1df3	65	STATE_TX_XMIT /!< Transmitter is in transfer state. /
giryan	0:274eb57e1df3	66	} eMBSndState;
giryan	0:274eb57e1df3	67
giryan	0:274eb57e1df3	68	/* ----------------------- Static variables ---------------------------------*/
giryan	0:274eb57e1df3	69	static volatile eMBSndState eSndState;
giryan	0:274eb57e1df3	70	static volatile eMBRcvState eRcvState;
giryan	0:274eb57e1df3	71
giryan	0:274eb57e1df3	72	volatile UCHAR ucRTUBuf[MB_SER_PDU_SIZE_MAX];
giryan	0:274eb57e1df3	73
giryan	0:274eb57e1df3	74	static volatile UCHAR *pucSndBufferCur;
giryan	0:274eb57e1df3	75	static volatile USHORT usSndBufferCount;
giryan	0:274eb57e1df3	76
giryan	0:274eb57e1df3	77	static volatile USHORT usRcvBufferPos;
giryan	0:274eb57e1df3	78
giryan	0:274eb57e1df3	79	/* ----------------------- Start implementation -----------------------------*/
giryan	0:274eb57e1df3	80	eMBErrorCode
giryan	0:274eb57e1df3	81	eMBRTUInit( UCHAR ucSlaveAddress, UCHAR ucPort, ULONG ulBaudRate, eMBParity eParity )
giryan	0:274eb57e1df3	82	{
giryan	0:274eb57e1df3	83	eMBErrorCode eStatus = MB_ENOERR;
giryan	0:274eb57e1df3	84	ULONG usTimerT35_50us;
giryan	0:274eb57e1df3	85
giryan	0:274eb57e1df3	86	( void )ucSlaveAddress;
giryan	0:274eb57e1df3	87	ENTER_CRITICAL_SECTION( );
giryan	0:274eb57e1df3	88
giryan	0:274eb57e1df3	89	/* Modbus RTU uses 8 Databits. */
giryan	0:274eb57e1df3	90	if( xMBPortSerialInit( ucPort, ulBaudRate, 8, eParity ) != TRUE )
giryan	0:274eb57e1df3	91	{
giryan	0:274eb57e1df3	92	eStatus = MB_EPORTERR;
giryan	0:274eb57e1df3	93	}
giryan	0:274eb57e1df3	94	else
giryan	0:274eb57e1df3	95	{
giryan	0:274eb57e1df3	96	/* If baudrate > 19200 then we should use the fixed timer values
giryan	0:274eb57e1df3	97	* t35 = 1750us. Otherwise t35 must be 3.5 times the character time.
giryan	0:274eb57e1df3	98	*/
giryan	0:274eb57e1df3	99	if( ulBaudRate > 19200 )
giryan	0:274eb57e1df3	100	{
giryan	0:274eb57e1df3	101	usTimerT35_50us = 35; /* 1800us. */
giryan	0:274eb57e1df3	102	}
giryan	0:274eb57e1df3	103	else
giryan	0:274eb57e1df3	104	{
giryan	0:274eb57e1df3	105	/* The timer reload value for a character is given by:
giryan	0:274eb57e1df3	106	*
giryan	0:274eb57e1df3	107	* ChTimeValue = Ticks_per_1s / ( Baudrate / 11 )
giryan	0:274eb57e1df3	108	* = 11 * Ticks_per_1s / Baudrate
giryan	0:274eb57e1df3	109	* = 220000 / Baudrate
giryan	0:274eb57e1df3	110	* The reload for t3.5 is 1.5 times this value and similary
giryan	0:274eb57e1df3	111	* for t3.5.
giryan	0:274eb57e1df3	112	*/
giryan	0:274eb57e1df3	113	usTimerT35_50us = ( 7UL * 220000UL ) / ( 2UL * ulBaudRate );
giryan	0:274eb57e1df3	114	}
giryan	0:274eb57e1df3	115	if( xMBPortTimersInit( ( USHORT ) usTimerT35_50us ) != TRUE )
giryan	0:274eb57e1df3	116	{
giryan	0:274eb57e1df3	117	eStatus = MB_EPORTERR;
giryan	0:274eb57e1df3	118	}
giryan	0:274eb57e1df3	119	}
giryan	0:274eb57e1df3	120	EXIT_CRITICAL_SECTION( );
giryan	0:274eb57e1df3	121
giryan	0:274eb57e1df3	122	return eStatus;
giryan	0:274eb57e1df3	123	}
giryan	0:274eb57e1df3	124
giryan	0:274eb57e1df3	125	void
giryan	0:274eb57e1df3	126	eMBRTUStart( void )
giryan	0:274eb57e1df3	127	{
giryan	0:274eb57e1df3	128	ENTER_CRITICAL_SECTION( );
giryan	0:274eb57e1df3	129	/* Initially the receiver is in the state STATE_RX_INIT. we start
giryan	0:274eb57e1df3	130	* the timer and if no character is received within t3.5 we change
giryan	0:274eb57e1df3	131	* to STATE_RX_IDLE. This makes sure that we delay startup of the
giryan	0:274eb57e1df3	132	* modbus protocol stack until the bus is free.
giryan	0:274eb57e1df3	133	*/
giryan	0:274eb57e1df3	134	eRcvState = STATE_RX_INIT;
giryan	0:274eb57e1df3	135	vMBPortSerialEnable( TRUE, FALSE );
giryan	0:274eb57e1df3	136	vMBPortTimersEnable( );
giryan	0:274eb57e1df3	137	EXIT_CRITICAL_SECTION( );
giryan	0:274eb57e1df3	138	}
giryan	0:274eb57e1df3	139
giryan	0:274eb57e1df3	140	void
giryan	0:274eb57e1df3	141	eMBRTUStop( void )
giryan	0:274eb57e1df3	142	{
giryan	0:274eb57e1df3	143	ENTER_CRITICAL_SECTION( );
giryan	0:274eb57e1df3	144	vMBPortSerialEnable( FALSE, FALSE );
giryan	0:274eb57e1df3	145	vMBPortTimersDisable( );
giryan	0:274eb57e1df3	146	EXIT_CRITICAL_SECTION( );
giryan	0:274eb57e1df3	147	}
giryan	0:274eb57e1df3	148
giryan	0:274eb57e1df3	149	eMBErrorCode
giryan	0:274eb57e1df3	150	eMBRTUReceive( UCHAR * pucRcvAddress, UCHAR ** pucFrame, USHORT * pusLength )
giryan	0:274eb57e1df3	151	{
giryan	0:274eb57e1df3	152	BOOL xFrameReceived = FALSE;
giryan	0:274eb57e1df3	153	eMBErrorCode eStatus = MB_ENOERR;
giryan	0:274eb57e1df3	154
giryan	0:274eb57e1df3	155	ENTER_CRITICAL_SECTION( );
giryan	0:274eb57e1df3	156	assert( usRcvBufferPos < MB_SER_PDU_SIZE_MAX );
giryan	0:274eb57e1df3	157
giryan	0:274eb57e1df3	158	/* Length and CRC check */
giryan	0:274eb57e1df3	159	if( ( usRcvBufferPos >= MB_SER_PDU_SIZE_MIN )
giryan	0:274eb57e1df3	160	&& ( usMBCRC16( ( UCHAR * ) ucRTUBuf, usRcvBufferPos ) == 0 ) )
giryan	0:274eb57e1df3	161	{
giryan	0:274eb57e1df3	162	/* Save the address field. All frames are passed to the upper layer
giryan	0:274eb57e1df3	163	* and the decision if a frame is used is done there.
giryan	0:274eb57e1df3	164	*/
giryan	0:274eb57e1df3	165	*pucRcvAddress = ucRTUBuf[MB_SER_PDU_ADDR_OFF];
giryan	0:274eb57e1df3	166
giryan	0:274eb57e1df3	167	/* Total length of Modbus-PDU is Modbus-Serial-Line-PDU minus
giryan	0:274eb57e1df3	168	* size of address field and CRC checksum.
giryan	0:274eb57e1df3	169	*/
giryan	0:274eb57e1df3	170	*pusLength = ( USHORT )( usRcvBufferPos - MB_SER_PDU_PDU_OFF - MB_SER_PDU_SIZE_CRC );
giryan	0:274eb57e1df3	171
giryan	0:274eb57e1df3	172	/* Return the start of the Modbus PDU to the caller. */
giryan	0:274eb57e1df3	173	pucFrame = ( UCHAR ) & ucRTUBuf[MB_SER_PDU_PDU_OFF];
giryan	0:274eb57e1df3	174	xFrameReceived = TRUE;
giryan	0:274eb57e1df3	175
giryan	0:274eb57e1df3	176	// Added by Cam
giryan	0:274eb57e1df3	177	// Now that the poll routine knows about the received frame,
giryan	0:274eb57e1df3	178	// clear the receive buffer position ready for the next frame received
giryan	0:274eb57e1df3	179	usRcvBufferPos = 0;
giryan	0:274eb57e1df3	180
giryan	0:274eb57e1df3	181	}
giryan	0:274eb57e1df3	182	else
giryan	0:274eb57e1df3	183	{
giryan	0:274eb57e1df3	184	eStatus = MB_EIO;
giryan	0:274eb57e1df3	185	}
giryan	0:274eb57e1df3	186
giryan	0:274eb57e1df3	187	EXIT_CRITICAL_SECTION( );
giryan	0:274eb57e1df3	188	return eStatus;
giryan	0:274eb57e1df3	189	}
giryan	0:274eb57e1df3	190
giryan	0:274eb57e1df3	191	eMBErrorCode
giryan	0:274eb57e1df3	192	eMBRTUSend( UCHAR ucSlaveAddress, const UCHAR * pucFrame, USHORT usLength )
giryan	0:274eb57e1df3	193	{
giryan	0:274eb57e1df3	194	eMBErrorCode eStatus = MB_ENOERR;
giryan	0:274eb57e1df3	195	USHORT usCRC16;
giryan	0:274eb57e1df3	196
giryan	0:274eb57e1df3	197	ENTER_CRITICAL_SECTION( );
giryan	0:274eb57e1df3	198
giryan	0:274eb57e1df3	199	/* Check if the receiver is still in idle state. If not we where to
giryan	0:274eb57e1df3	200	* slow with processing the received frame and the master sent another
giryan	0:274eb57e1df3	201	* frame on the network. We have to abort sending the frame.
giryan	0:274eb57e1df3	202	*/
giryan	0:274eb57e1df3	203	if( eRcvState == STATE_RX_IDLE )
giryan	0:274eb57e1df3	204	{
giryan	0:274eb57e1df3	205	/* First byte before the Modbus-PDU is the slave address. */
giryan	0:274eb57e1df3	206	pucSndBufferCur = ( UCHAR * ) pucFrame - 1;
giryan	0:274eb57e1df3	207	usSndBufferCount = 1;
giryan	0:274eb57e1df3	208
giryan	0:274eb57e1df3	209	/* Now copy the Modbus-PDU into the Modbus-Serial-Line-PDU. */
giryan	0:274eb57e1df3	210	pucSndBufferCur[MB_SER_PDU_ADDR_OFF] = ucSlaveAddress;
giryan	0:274eb57e1df3	211	usSndBufferCount += usLength;
giryan	0:274eb57e1df3	212
giryan	0:274eb57e1df3	213	/* Calculate CRC16 checksum for Modbus-Serial-Line-PDU. */
giryan	0:274eb57e1df3	214	usCRC16 = usMBCRC16( ( UCHAR * ) pucSndBufferCur, usSndBufferCount );
giryan	0:274eb57e1df3	215	ucRTUBuf[usSndBufferCount++] = ( UCHAR )( usCRC16 & 0xFF );
giryan	0:274eb57e1df3	216	ucRTUBuf[usSndBufferCount++] = ( UCHAR )( usCRC16 >> 8 );
giryan	0:274eb57e1df3	217
giryan	0:274eb57e1df3	218	/* Activate the transmitter. */
giryan	0:274eb57e1df3	219	eSndState = STATE_TX_XMIT;
giryan	0:274eb57e1df3	220	vMBPortSerialEnable( FALSE, TRUE );
giryan	0:274eb57e1df3	221	}
giryan	0:274eb57e1df3	222	else
giryan	0:274eb57e1df3	223	{
giryan	0:274eb57e1df3	224	eStatus = MB_EIO;
giryan	0:274eb57e1df3	225	}
giryan	0:274eb57e1df3	226	EXIT_CRITICAL_SECTION( );
giryan	0:274eb57e1df3	227	return eStatus;
giryan	0:274eb57e1df3	228	}
giryan	0:274eb57e1df3	229
giryan	0:274eb57e1df3	230	BOOL
giryan	0:274eb57e1df3	231	xMBRTUReceiveFSM( void )
giryan	0:274eb57e1df3	232	{
giryan	0:274eb57e1df3	233	BOOL xTaskNeedSwitch = FALSE;
giryan	0:274eb57e1df3	234	UCHAR ucByte;
giryan	0:274eb57e1df3	235
giryan	0:274eb57e1df3	236	assert( eSndState == STATE_TX_IDLE );
giryan	0:274eb57e1df3	237
giryan	0:274eb57e1df3	238	/* Always read the character. */
giryan	0:274eb57e1df3	239	( void )xMBPortSerialGetByte( ( CHAR * ) & ucByte );
giryan	0:274eb57e1df3	240
giryan	0:274eb57e1df3	241	switch ( eRcvState )
giryan	0:274eb57e1df3	242	{
giryan	0:274eb57e1df3	243	/* If we have received a character in the init state we have to
giryan	0:274eb57e1df3	244	* wait until the frame is finished.
giryan	0:274eb57e1df3	245	*/
giryan	0:274eb57e1df3	246	case STATE_RX_INIT:
giryan	0:274eb57e1df3	247	vMBPortTimersEnable( );
giryan	0:274eb57e1df3	248	break;
giryan	0:274eb57e1df3	249
giryan	0:274eb57e1df3	250	/* In the error state we wait until all characters in the
giryan	0:274eb57e1df3	251	* damaged frame are transmitted.
giryan	0:274eb57e1df3	252	*/
giryan	0:274eb57e1df3	253	case STATE_RX_ERROR:
giryan	0:274eb57e1df3	254	vMBPortTimersEnable( );
giryan	0:274eb57e1df3	255	break;
giryan	0:274eb57e1df3	256
giryan	0:274eb57e1df3	257	/* In the idle state we wait for a new character. If a character
giryan	0:274eb57e1df3	258	* is received the t1.5 and t3.5 timers are started and the
giryan	0:274eb57e1df3	259	* receiver is in the state STATE_RX_RECEIVE.
giryan	0:274eb57e1df3	260	*/
giryan	0:274eb57e1df3	261	case STATE_RX_IDLE:
giryan	0:274eb57e1df3	262	ucRTUBuf[usRcvBufferPos++] = ucByte;
giryan	0:274eb57e1df3	263	eRcvState = STATE_RX_RCV;
giryan	0:274eb57e1df3	264
giryan	0:274eb57e1df3	265	/* Enable t3.5 timers. */
giryan	0:274eb57e1df3	266	vMBPortTimersEnable( );
giryan	0:274eb57e1df3	267	break;
giryan	0:274eb57e1df3	268
giryan	0:274eb57e1df3	269	/* We are currently receiving a frame. Reset the timer after
giryan	0:274eb57e1df3	270	* every character received. If more than the maximum possible
giryan	0:274eb57e1df3	271	* number of bytes in a modbus frame is received the frame is
giryan	0:274eb57e1df3	272	* ignored.
giryan	0:274eb57e1df3	273	*/
giryan	0:274eb57e1df3	274	case STATE_RX_RCV:
giryan	0:274eb57e1df3	275	if( usRcvBufferPos < MB_SER_PDU_SIZE_MAX )
giryan	0:274eb57e1df3	276	{
giryan	0:274eb57e1df3	277	ucRTUBuf[usRcvBufferPos++] = ucByte;
giryan	0:274eb57e1df3	278	}
giryan	0:274eb57e1df3	279	else
giryan	0:274eb57e1df3	280	{
giryan	0:274eb57e1df3	281	eRcvState = STATE_RX_ERROR;
giryan	0:274eb57e1df3	282	}
giryan	0:274eb57e1df3	283	vMBPortTimersEnable( );
giryan	0:274eb57e1df3	284	break;
giryan	0:274eb57e1df3	285	}
giryan	0:274eb57e1df3	286	return xTaskNeedSwitch;
giryan	0:274eb57e1df3	287	}
giryan	0:274eb57e1df3	288
giryan	0:274eb57e1df3	289	BOOL
giryan	0:274eb57e1df3	290	xMBRTUTransmitFSM( void )
giryan	0:274eb57e1df3	291	{
giryan	0:274eb57e1df3	292	BOOL xNeedPoll = FALSE;
giryan	0:274eb57e1df3	293
giryan	0:274eb57e1df3	294	assert( eRcvState == STATE_RX_IDLE );
giryan	0:274eb57e1df3	295	switch ( eSndState )
giryan	0:274eb57e1df3	296	{
giryan	0:274eb57e1df3	297	/* We should not get a transmitter event if the transmitter is in
giryan	0:274eb57e1df3	298	* idle state. */
giryan	0:274eb57e1df3	299	case STATE_TX_IDLE:
giryan	0:274eb57e1df3	300	/* enable receiver/disable transmitter. */
giryan	0:274eb57e1df3	301	vMBPortSerialEnable( TRUE, FALSE );
giryan	0:274eb57e1df3	302	break;
giryan	0:274eb57e1df3	303
giryan	0:274eb57e1df3	304	case STATE_TX_XMIT:
giryan	0:274eb57e1df3	305	/* check if we are finished. */
giryan	0:274eb57e1df3	306	if( usSndBufferCount != 0 )
giryan	0:274eb57e1df3	307	{
giryan	0:274eb57e1df3	308	xMBPortSerialPutByte( ( CHAR )*pucSndBufferCur );
giryan	0:274eb57e1df3	309	pucSndBufferCur++; /* next byte in sendbuffer. */
giryan	0:274eb57e1df3	310	usSndBufferCount--;
giryan	0:274eb57e1df3	311	}
giryan	0:274eb57e1df3	312	else
giryan	0:274eb57e1df3	313	{
giryan	0:274eb57e1df3	314	xNeedPoll = xMBPortEventPost( EV_FRAME_SENT );
giryan	0:274eb57e1df3	315	/* Disable transmitter. This prevents another transmit buffer
giryan	0:274eb57e1df3	316	* empty interrupt. */
giryan	0:274eb57e1df3	317	vMBPortSerialEnable( TRUE, FALSE );
giryan	0:274eb57e1df3	318	eSndState = STATE_TX_IDLE;
giryan	0:274eb57e1df3	319	}
giryan	0:274eb57e1df3	320	break;
giryan	0:274eb57e1df3	321	}
giryan	0:274eb57e1df3	322
giryan	0:274eb57e1df3	323	return xNeedPoll;
giryan	0:274eb57e1df3	324	}
giryan	0:274eb57e1df3	325
giryan	0:274eb57e1df3	326	BOOL
giryan	0:274eb57e1df3	327	xMBRTUTimerT35Expired( void )
giryan	0:274eb57e1df3	328	{
giryan	0:274eb57e1df3	329	BOOL xNeedPoll = FALSE;
giryan	0:274eb57e1df3	330
giryan	0:274eb57e1df3	331	switch ( eRcvState )
giryan	0:274eb57e1df3	332	{
giryan	0:274eb57e1df3	333	/* Timer t35 expired. Startup phase is finished. */
giryan	0:274eb57e1df3	334	case STATE_RX_INIT:
giryan	0:274eb57e1df3	335	xNeedPoll = xMBPortEventPost( EV_READY );
giryan	0:274eb57e1df3	336	break;
giryan	0:274eb57e1df3	337
giryan	0:274eb57e1df3	338	/* A frame was received and t35 expired. Notify the listener that
giryan	0:274eb57e1df3	339	* a new frame was received. */
giryan	0:274eb57e1df3	340	case STATE_RX_RCV:
giryan	0:274eb57e1df3	341	xNeedPoll = xMBPortEventPost( EV_FRAME_RECEIVED );
giryan	0:274eb57e1df3	342	break;
giryan	0:274eb57e1df3	343
giryan	0:274eb57e1df3	344	/* An error occured while receiving the frame. */
giryan	0:274eb57e1df3	345	case STATE_RX_ERROR:
giryan	0:274eb57e1df3	346	break;
giryan	0:274eb57e1df3	347
giryan	0:274eb57e1df3	348	/* Function called in an illegal state. */
giryan	0:274eb57e1df3	349	default:
giryan	0:274eb57e1df3	350	assert( ( eRcvState == STATE_RX_INIT ) \|\|
giryan	0:274eb57e1df3	351	( eRcvState == STATE_RX_RCV ) \|\| ( eRcvState == STATE_RX_ERROR ) );
giryan	0:274eb57e1df3	352	}
giryan	0:274eb57e1df3	353
giryan	0:274eb57e1df3	354	vMBPortTimersDisable( );
giryan	0:274eb57e1df3	355	eRcvState = STATE_RX_IDLE;
giryan	0:274eb57e1df3	356
giryan	0:274eb57e1df3	357	return xNeedPoll;
giryan	0:274eb57e1df3	358	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	22 Aug 2010
Imports:	245
Forks:	2
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	6

This repository is Public (Unlisted).

mbrtu.cpp@0:274eb57e1df3, 2010-08-22 (annotated)

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