mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
66fb5a29bb
Apply the pre-commit hook whitespace fixes to all files in the repo. (Line endings, blank lines at end of file, trailing whitespace)
574 lines
18 KiB
C
574 lines
18 KiB
C
/*
|
|
* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
|
|
* Copyright (c) 2006 Christian Walter <wolti@sil.at>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* File: $Id: mbascii.c,v 1.17 2010/06/06 13:47:07 wolti Exp $
|
|
*/
|
|
|
|
/* ----------------------- System includes ----------------------------------*/
|
|
#include "stdlib.h"
|
|
#include "string.h"
|
|
|
|
/* ----------------------- Platform includes --------------------------------*/
|
|
#include "port.h"
|
|
|
|
/* ----------------------- Modbus includes ----------------------------------*/
|
|
#include "mb_m.h"
|
|
#include "mbconfig.h"
|
|
#include "mbascii.h"
|
|
#include "mbframe.h"
|
|
|
|
#include "mbcrc.h"
|
|
#include "mbport.h"
|
|
|
|
#if MB_MASTER_ASCII_ENABLED > 0
|
|
|
|
/* ----------------------- Defines ------------------------------------------*/
|
|
|
|
/* ----------------------- Type definitions ---------------------------------*/
|
|
typedef enum
|
|
{
|
|
STATE_M_RX_INIT, /*!< Receiver is in initial state. */
|
|
STATE_M_RX_IDLE, /*!< Receiver is in idle state. */
|
|
STATE_M_RX_RCV, /*!< Frame is beeing received. */
|
|
STATE_M_RX_WAIT_EOF, /*!< Wait for End of Frame. */
|
|
STATE_M_RX_ERROR, /*!< If the frame is invalid. */
|
|
} eMBMasterAsciiRcvState;
|
|
|
|
typedef enum
|
|
{
|
|
STATE_M_TX_IDLE, /*!< Transmitter is in idle state. */
|
|
STATE_M_TX_START, /*!< Starting transmission (':' sent). */
|
|
STATE_M_TX_DATA, /*!< Sending of data (Address, Data, LRC). */
|
|
STATE_M_TX_END, /*!< End of transmission. */
|
|
STATE_M_TX_NOTIFY, /*!< Notify sender that the frame has been sent. */
|
|
STATE_M_TX_XFWR, /*!< Transmitter is in transfer finish and wait receive state. */
|
|
} eMBMasterAsciiSndState;
|
|
|
|
typedef enum
|
|
{
|
|
BYTE_HIGH_NIBBLE, /*!< Character for high nibble of byte. */
|
|
BYTE_LOW_NIBBLE /*!< Character for low nibble of byte. */
|
|
} eMBBytePos;
|
|
|
|
/* ----------------------- Shared values -----------------------------------*/
|
|
/* These Modbus values are shared in ASCII mode*/
|
|
extern volatile UCHAR ucMasterRcvBuf[];
|
|
extern volatile UCHAR ucMasterSndBuf[];
|
|
extern volatile eMBMasterTimerMode eMasterCurTimerMode;
|
|
|
|
/* ----------------------- Static functions ---------------------------------*/
|
|
static UCHAR prvucMBCHAR2BIN( UCHAR ucCharacter );
|
|
|
|
static UCHAR prvucMBBIN2CHAR( UCHAR ucByte );
|
|
|
|
static UCHAR prvucMBLRC( UCHAR * pucFrame, USHORT usLen );
|
|
|
|
/* ----------------------- Static variables ---------------------------------*/
|
|
static volatile eMBMasterAsciiSndState eSndState;
|
|
static volatile eMBMasterAsciiRcvState eRcvState;
|
|
|
|
static volatile UCHAR *ucMasterASCIIRcvBuf = ucMasterRcvBuf;
|
|
static volatile UCHAR *ucMasterASCIISndBuf = ucMasterSndBuf;
|
|
|
|
static volatile USHORT usMasterRcvBufferPos;
|
|
static volatile eMBBytePos eBytePos;
|
|
|
|
static volatile UCHAR *pucMasterSndBufferCur;
|
|
static volatile USHORT usMasterSndBufferCount;
|
|
|
|
static volatile UCHAR ucLRC;
|
|
static volatile UCHAR ucMBLFCharacter;
|
|
|
|
/* ----------------------- Start implementation -----------------------------*/
|
|
eMBErrorCode
|
|
eMBMasterASCIIInit( UCHAR ucPort, ULONG ulBaudRate, eMBParity eParity )
|
|
{
|
|
eMBErrorCode eStatus = MB_ENOERR;
|
|
|
|
ENTER_CRITICAL_SECTION( );
|
|
ucMBLFCharacter = MB_ASCII_DEFAULT_LF;
|
|
|
|
if( xMBMasterPortSerialInit( ucPort, ulBaudRate, MB_ASCII_BITS_PER_SYMB, eParity ) != TRUE )
|
|
{
|
|
eStatus = MB_EPORTERR;
|
|
}
|
|
else if( xMBMasterPortTimersInit( MB_ASCII_TIMEOUT_MS * MB_TIMER_TICS_PER_MS ) != TRUE )
|
|
{
|
|
eStatus = MB_EPORTERR;
|
|
}
|
|
|
|
EXIT_CRITICAL_SECTION( );
|
|
|
|
return eStatus;
|
|
}
|
|
|
|
void
|
|
eMBMasterASCIIStart( void )
|
|
{
|
|
ENTER_CRITICAL_SECTION( );
|
|
eRcvState = STATE_M_RX_IDLE;
|
|
vMBMasterPortSerialEnable( TRUE, FALSE );
|
|
vMBMasterPortTimersT35Enable( );
|
|
EXIT_CRITICAL_SECTION( );
|
|
}
|
|
|
|
void
|
|
eMBMasterASCIIStop( void )
|
|
{
|
|
ENTER_CRITICAL_SECTION( );
|
|
vMBMasterPortSerialEnable( FALSE, FALSE );
|
|
vMBMasterPortTimersDisable( );
|
|
EXIT_CRITICAL_SECTION( );
|
|
}
|
|
|
|
eMBErrorCode
|
|
eMBMasterASCIIReceive( UCHAR * pucRcvAddress, UCHAR ** pucFrame, USHORT * pusLength )
|
|
{
|
|
eMBErrorCode eStatus = MB_ENOERR;
|
|
|
|
ENTER_CRITICAL_SECTION( );
|
|
assert( usMasterRcvBufferPos < MB_SER_PDU_SIZE_MAX );
|
|
|
|
/* Length and CRC check */
|
|
if( ( usMasterRcvBufferPos >= MB_ASCII_SER_PDU_SIZE_MIN )
|
|
&& ( prvucMBLRC( ( UCHAR * ) ucMasterASCIIRcvBuf, usMasterRcvBufferPos ) == 0 ) )
|
|
{
|
|
/* Save the address field. All frames are passed to the upper layed
|
|
* and the decision if a frame is used is done there.
|
|
*/
|
|
*pucRcvAddress = ucMasterASCIIRcvBuf[MB_SER_PDU_ADDR_OFF];
|
|
|
|
/* Total length of Modbus-PDU is Modbus-Serial-Line-PDU minus
|
|
* size of address field and CRC checksum.
|
|
*/
|
|
*pusLength = ( USHORT )( usMasterRcvBufferPos - MB_SER_PDU_PDU_OFF - MB_SER_PDU_SIZE_LRC );
|
|
|
|
/* Return the start of the Modbus PDU to the caller. */
|
|
*pucFrame = ( UCHAR * ) & ucMasterASCIIRcvBuf[MB_SER_PDU_PDU_OFF];
|
|
}
|
|
else
|
|
{
|
|
eStatus = MB_EIO;
|
|
}
|
|
EXIT_CRITICAL_SECTION( );
|
|
return eStatus;
|
|
}
|
|
|
|
eMBErrorCode
|
|
eMBMasterASCIISend( UCHAR ucSlaveAddress, const UCHAR * pucFrame, USHORT usLength )
|
|
{
|
|
eMBErrorCode eStatus = MB_ENOERR;
|
|
UCHAR usLRC;
|
|
|
|
if ( ucSlaveAddress > MB_MASTER_TOTAL_SLAVE_NUM ) return MB_EINVAL;
|
|
|
|
ENTER_CRITICAL_SECTION( );
|
|
/* Check if the receiver is still in idle state. If not we where too
|
|
* slow with processing the received frame and the master sent another
|
|
* frame on the network. We have to abort sending the frame.
|
|
*/
|
|
if(eRcvState == STATE_M_RX_IDLE)
|
|
{
|
|
/* First byte before the Modbus-PDU is the slave address. */
|
|
pucMasterSndBufferCur = ( UCHAR * ) pucFrame - 1;
|
|
usMasterSndBufferCount = 1;
|
|
|
|
/* Now copy the Modbus-PDU into the Modbus-Serial-Line-PDU. */
|
|
pucMasterSndBufferCur[MB_SER_PDU_ADDR_OFF] = ucSlaveAddress;
|
|
usMasterSndBufferCount += usLength;
|
|
|
|
/* Calculate LRC checksum for Modbus-Serial-Line-PDU. */
|
|
usLRC = prvucMBLRC( ( UCHAR * ) pucMasterSndBufferCur, usMasterSndBufferCount );
|
|
ucMasterASCIISndBuf[usMasterSndBufferCount++] = usLRC;
|
|
|
|
/* Activate the transmitter. */
|
|
eSndState = STATE_M_TX_START;
|
|
vMBMasterPortSerialEnable( FALSE, TRUE );
|
|
}
|
|
else
|
|
{
|
|
eStatus = MB_EIO;
|
|
}
|
|
EXIT_CRITICAL_SECTION( );
|
|
return eStatus;
|
|
}
|
|
|
|
BOOL
|
|
xMBMasterASCIIReceiveFSM( void )
|
|
{
|
|
BOOL xNeedPoll = FALSE;
|
|
UCHAR ucByte;
|
|
UCHAR ucResult;
|
|
|
|
assert(( eSndState == STATE_M_TX_IDLE ) || ( eSndState == STATE_M_TX_XFWR ));
|
|
|
|
/* Always read the character. */
|
|
xNeedPoll = xMBMasterPortSerialGetByte( ( CHAR * ) & ucByte );
|
|
|
|
switch ( eRcvState )
|
|
{
|
|
/* If we have received a character in the init state we have to
|
|
* wait until the frame is finished.
|
|
*/
|
|
case STATE_M_RX_INIT:
|
|
vMBMasterPortTimersT35Enable( );
|
|
break;
|
|
|
|
/* In the error state we wait until all characters in the
|
|
* damaged frame are transmitted.
|
|
*/
|
|
case STATE_M_RX_ERROR:
|
|
vMBMasterPortTimersRespondTimeoutEnable( );
|
|
break;
|
|
|
|
/* In the idle state we wait for a new character. If a character
|
|
* is received the t1.5 and t3.5 timers are started and the
|
|
* receiver is in the state STATE_RX_RECEIVE and disable early
|
|
* the timer of respond timeout .
|
|
*/
|
|
case STATE_M_RX_IDLE:
|
|
/* Waiting for the start of frame character during respond timeout */
|
|
vMBMasterPortTimersRespondTimeoutEnable( );
|
|
if( ucByte == ':' )
|
|
{
|
|
/* Reset the input buffers to store the frame in receive state. */
|
|
usMasterRcvBufferPos = 0;
|
|
eBytePos = BYTE_HIGH_NIBBLE;
|
|
eRcvState = STATE_M_RX_RCV;
|
|
}
|
|
eSndState = STATE_M_TX_IDLE;
|
|
break;
|
|
|
|
/* A new character is received. If the character is a ':' the input
|
|
* buffer is cleared. A CR-character signals the end of the data
|
|
* block. Other characters are part of the data block and their
|
|
* ASCII value is converted back to a binary representation.
|
|
*/
|
|
case STATE_M_RX_RCV:
|
|
/* Enable timer timeout. */
|
|
vMBMasterPortTimersT35Enable( );
|
|
if( ucByte == ':' )
|
|
{
|
|
/* Empty receive buffer. */
|
|
eBytePos = BYTE_HIGH_NIBBLE;
|
|
usMasterRcvBufferPos = 0;
|
|
}
|
|
else if( ucByte == MB_ASCII_DEFAULT_CR )
|
|
{
|
|
eRcvState = STATE_M_RX_WAIT_EOF;
|
|
}
|
|
else
|
|
{
|
|
ucResult = prvucMBCHAR2BIN( ucByte );
|
|
switch ( eBytePos )
|
|
{
|
|
/* High nibble of the byte comes first. We check for
|
|
* a buffer overflow here. */
|
|
case BYTE_HIGH_NIBBLE:
|
|
if( usMasterRcvBufferPos < MB_SER_PDU_SIZE_MAX )
|
|
{
|
|
ucMasterASCIIRcvBuf[usMasterRcvBufferPos] = ( UCHAR )( ucResult << 4 );
|
|
eBytePos = BYTE_LOW_NIBBLE;
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
/* not handled in Modbus specification but seems
|
|
* a resonable implementation. */
|
|
eRcvState = STATE_M_RX_ERROR;
|
|
/* Disable previously activated timer because of error state. */
|
|
vMBPortTimersDisable( );
|
|
}
|
|
break;
|
|
|
|
case BYTE_LOW_NIBBLE:
|
|
ucMasterASCIIRcvBuf[usMasterRcvBufferPos] |= ucResult;
|
|
usMasterRcvBufferPos++;
|
|
eBytePos = BYTE_HIGH_NIBBLE;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case STATE_M_RX_WAIT_EOF:
|
|
if( ucByte == ucMBLFCharacter )
|
|
{
|
|
/* Disable character timeout timer because all characters are
|
|
* received. */
|
|
vMBMasterPortTimersDisable( );
|
|
/* Receiver is again in idle state. */
|
|
eRcvState = STATE_M_RX_IDLE;
|
|
|
|
/* Notify the caller of eMBMasterASCIIReceive that a new frame
|
|
* was received. */
|
|
(void)xMBMasterPortEventPost( EV_MASTER_FRAME_RECEIVED );
|
|
xNeedPoll = FALSE;
|
|
}
|
|
else if( ucByte == ':' )
|
|
{
|
|
/* Start of frame character received but last message is not completed.
|
|
* Empty receive buffer and back to receive state. */
|
|
eBytePos = BYTE_HIGH_NIBBLE;
|
|
usMasterRcvBufferPos = 0;
|
|
eRcvState = STATE_M_RX_IDLE;
|
|
|
|
/* Enable timer for respond timeout and wait for next frame. */
|
|
vMBMasterPortTimersRespondTimeoutEnable( );
|
|
}
|
|
else
|
|
{
|
|
/* Frame is not okay. Delete entire frame. */
|
|
eRcvState = STATE_M_RX_IDLE;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return xNeedPoll;
|
|
}
|
|
|
|
BOOL
|
|
xMBMasterASCIITransmitFSM( void )
|
|
{
|
|
BOOL xNeedPoll = TRUE;
|
|
UCHAR ucByte;
|
|
BOOL xFrameIsBroadcast = FALSE;
|
|
|
|
assert( eRcvState == STATE_M_RX_IDLE );
|
|
|
|
switch ( eSndState )
|
|
{
|
|
/* We should not get a transmitter event if the transmitter is in
|
|
* idle state. */
|
|
case STATE_M_TX_XFWR:
|
|
break;
|
|
|
|
/* We should not get a transmitter event if the transmitter is in
|
|
* idle state. */
|
|
case STATE_M_TX_IDLE:
|
|
break;
|
|
|
|
/* Start of transmission. The start of a frame is defined by sending
|
|
* the character ':'. */
|
|
case STATE_M_TX_START:
|
|
ucByte = ':';
|
|
xMBMasterPortSerialPutByte( ( CHAR )ucByte );
|
|
eSndState = STATE_M_TX_DATA;
|
|
eBytePos = BYTE_HIGH_NIBBLE;
|
|
break;
|
|
|
|
/* Send the data block. Each data byte is encoded as a character hex
|
|
* stream with the high nibble sent first and the low nibble sent
|
|
* last. If all data bytes are exhausted we send a '\r' character
|
|
* to end the transmission. */
|
|
case STATE_M_TX_DATA:
|
|
if( usMasterSndBufferCount > 0 )
|
|
{
|
|
switch ( eBytePos )
|
|
{
|
|
case BYTE_HIGH_NIBBLE:
|
|
ucByte = prvucMBBIN2CHAR( ( UCHAR )( *pucMasterSndBufferCur >> 4 ) );
|
|
xMBMasterPortSerialPutByte( ( CHAR ) ucByte );
|
|
eBytePos = BYTE_LOW_NIBBLE;
|
|
break;
|
|
|
|
case BYTE_LOW_NIBBLE:
|
|
ucByte = prvucMBBIN2CHAR( ( UCHAR )( *pucMasterSndBufferCur & 0x0F ) );
|
|
xMBMasterPortSerialPutByte( ( CHAR )ucByte );
|
|
pucMasterSndBufferCur++;
|
|
eBytePos = BYTE_HIGH_NIBBLE;
|
|
usMasterSndBufferCount--;
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
xMBMasterPortSerialPutByte( MB_ASCII_DEFAULT_CR );
|
|
eSndState = STATE_M_TX_END;
|
|
}
|
|
break;
|
|
|
|
/* Finish the frame by sending a LF character. */
|
|
case STATE_M_TX_END:
|
|
xMBMasterPortSerialPutByte( ( CHAR )ucMBLFCharacter );
|
|
/* We need another state to make sure that the CR character has
|
|
* been sent. */
|
|
eSndState = STATE_M_TX_NOTIFY;
|
|
break;
|
|
|
|
/* Notify the task which called eMBMasterASCIISend that the frame has
|
|
* been sent. */
|
|
case STATE_M_TX_NOTIFY:
|
|
xFrameIsBroadcast = ( ucMasterASCIISndBuf[MB_SER_PDU_ADDR_OFF] == MB_ADDRESS_BROADCAST ) ? TRUE : FALSE;
|
|
vMBMasterRequestSetType( xFrameIsBroadcast );
|
|
eSndState = STATE_M_TX_XFWR;
|
|
/* If the frame is broadcast ,master will enable timer of convert delay,
|
|
* else master will enable timer of respond timeout. */
|
|
if ( xFrameIsBroadcast == TRUE )
|
|
{
|
|
vMBMasterPortTimersConvertDelayEnable( );
|
|
}
|
|
else
|
|
{
|
|
vMBMasterPortTimersRespondTimeoutEnable( );
|
|
}
|
|
xNeedPoll = FALSE;
|
|
break;
|
|
}
|
|
|
|
return xNeedPoll;
|
|
}
|
|
|
|
BOOL
|
|
xMBMasterASCIITimerT1SExpired( void )
|
|
{
|
|
BOOL xNeedPoll = FALSE;
|
|
|
|
switch ( eRcvState )
|
|
{
|
|
/* Timer t35 expired. Startup phase is finished. */
|
|
case STATE_M_RX_INIT:
|
|
xNeedPoll = xMBMasterPortEventPost(EV_MASTER_READY);
|
|
ESP_EARLY_LOGI("xMBMasterASCIITimerT1SExpired", "RX_INIT_EXPIRED");
|
|
break;
|
|
|
|
/* Start of message is not received during respond timeout.
|
|
* Process error. */
|
|
case STATE_M_RX_IDLE:
|
|
eRcvState = STATE_M_RX_ERROR;
|
|
break;
|
|
|
|
/* A recieve timeout expired and no any new character received.
|
|
* Wait for respond time and go to error state to inform listener about error */
|
|
case STATE_M_RX_RCV:
|
|
eRcvState = STATE_M_RX_ERROR;
|
|
break;
|
|
|
|
/* An error occured while receiving the frame. */
|
|
case STATE_M_RX_ERROR:
|
|
vMBMasterSetErrorType(EV_ERROR_RECEIVE_DATA);
|
|
xNeedPoll = xMBMasterPortEventPost( EV_MASTER_ERROR_PROCESS );
|
|
break;
|
|
|
|
/* If we have a timeout we go back to the idle state and wait for
|
|
* the next frame.
|
|
*/
|
|
case STATE_M_RX_WAIT_EOF:
|
|
eRcvState = STATE_M_RX_IDLE;
|
|
break;
|
|
|
|
default:
|
|
assert( 0 );
|
|
break;
|
|
}
|
|
eRcvState = STATE_M_RX_IDLE;
|
|
|
|
switch (eSndState)
|
|
{
|
|
/* A frame was send finish and convert delay or respond timeout expired.
|
|
* If the frame is broadcast,The master will idle,and if the frame is not
|
|
* broadcast.*/
|
|
case STATE_M_TX_XFWR:
|
|
if ( xMBMasterRequestIsBroadcast( ) == FALSE ) {
|
|
vMBMasterSetErrorType(EV_ERROR_RESPOND_TIMEOUT);
|
|
xNeedPoll = xMBMasterPortEventPost(EV_MASTER_ERROR_PROCESS);
|
|
}
|
|
break;
|
|
|
|
/* Function called in an illegal state. */
|
|
default:
|
|
assert( ( eSndState == STATE_M_TX_START ) || ( eSndState == STATE_M_TX_IDLE )
|
|
|| ( eSndState == STATE_M_TX_DATA ) || ( eSndState == STATE_M_TX_END )
|
|
|| ( eSndState == STATE_M_TX_NOTIFY ) );
|
|
break;
|
|
}
|
|
eSndState = STATE_M_TX_IDLE;
|
|
|
|
vMBMasterPortTimersDisable( );
|
|
/* If timer mode is convert delay, the master event then turns EV_MASTER_EXECUTE status. */
|
|
if (xMBMasterGetCurTimerMode() == MB_TMODE_CONVERT_DELAY) {
|
|
xNeedPoll = xMBMasterPortEventPost( EV_MASTER_EXECUTE );
|
|
}
|
|
|
|
vMBMasterPortTimersDisable( );
|
|
|
|
/* no context switch required. */
|
|
return xNeedPoll;
|
|
}
|
|
|
|
static UCHAR
|
|
prvucMBCHAR2BIN( UCHAR ucCharacter )
|
|
{
|
|
if( ( ucCharacter >= '0' ) && ( ucCharacter <= '9' ) )
|
|
{
|
|
return ( UCHAR )( ucCharacter - '0' );
|
|
}
|
|
else if( ( ucCharacter >= 'A' ) && ( ucCharacter <= 'F' ) )
|
|
{
|
|
return ( UCHAR )( ucCharacter - 'A' + 0x0A );
|
|
}
|
|
else
|
|
{
|
|
return 0xFF;
|
|
}
|
|
}
|
|
|
|
static UCHAR
|
|
prvucMBBIN2CHAR( UCHAR ucByte )
|
|
{
|
|
if( ucByte <= 0x09 )
|
|
{
|
|
return ( UCHAR )( '0' + ucByte );
|
|
}
|
|
else if( ( ucByte >= 0x0A ) && ( ucByte <= 0x0F ) )
|
|
{
|
|
return ( UCHAR )( ucByte - 0x0A + 'A' );
|
|
}
|
|
else
|
|
{
|
|
/* Programming error. */
|
|
assert( 0 );
|
|
}
|
|
return '0';
|
|
}
|
|
|
|
static UCHAR
|
|
prvucMBLRC( UCHAR * pucFrame, USHORT usLen )
|
|
{
|
|
UCHAR ucLRC = 0; /* LRC char initialized */
|
|
|
|
while( usLen-- )
|
|
{
|
|
ucLRC += *pucFrame++; /* Add buffer byte without carry */
|
|
}
|
|
|
|
/* Return twos complement */
|
|
ucLRC = ( UCHAR ) ( -( ( CHAR ) ucLRC ) );
|
|
return ucLRC;
|
|
}
|
|
|
|
#endif
|