//---------------------------------------------------------------------------
// Attempt to acquire a 1-Wire net using a com port and a DS2480 based
// adapter.
//
// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
// OpenCOM to indicate the port number.
// 'port_zstr' - zero terminated port name. For this platform
// use format COMX where X is the port number.
// 'return_msg' - zero terminated return message.
//
// Returns: TRUE - success, COM port opened
//
int owAcquire(int portnum, char *port_zstr, char *return_msg)
{
int cnt=0;
portname[portnum][0] = 0;
// attempt to open the communications port
if (OpenCOM(portnum,port_zstr))
cnt += sprintf(&return_msg[cnt],"%s opened\n",port_zstr);
else
{
cnt += sprintf(&return_msg[cnt],"Could not open port %s,"
" aborting.\nClosing port %s.\n",port_zstr,port_zstr);
return FALSE;
}
// detect DS2480
if (DS2480Detect(portnum))
cnt += sprintf(&return_msg[cnt],"DS2480-based adapter detected\n");
else
{
cnt += sprintf(&return_msg[cnt],"DS2480-based adapter not detected, aborting program\n");
cnt += sprintf(&return_msg[cnt],"Closing port %s.\n",port_zstr);
CloseCOM(portnum);
return FALSE;
}
// success
sprintf(portname[portnum],"%s",port_zstr);
return TRUE;
}
//--------------------------------------------------------------------------
// Set the MicroLAN communucation speed.
//
// 'NewSpeed' - new speed defined as
// MODE_NORMAL 0x00
// MODE_OVERDRIVE 0x01
//
// Returns: current MicroLAN speed
//
int MLanSpeed(int NewSpeed)
{
uchar sendpacket[5];
short sendlen=0;
int rt = FALSE;
// check if change from current mode
if (((NewSpeed == MODE_OVERDRIVE) &&
(USpeed != SPEEDSEL_OD)) ||
((NewSpeed == MODE_NORMAL) &&
(USpeed != SPEEDSEL_FLEX)))
{
if (NewSpeed == MODE_OVERDRIVE)
{
// if overdrive then switch to 115200 baud
if (DS2480ChangeBaud(PARMSET_57600) == PARMSET_57600)
{
USpeed = SPEEDSEL_OD;
rt = TRUE;
}
}
else if (NewSpeed == MODE_NORMAL)
{
// else normal so set to 9600 baud
if (DS2480ChangeBaud(PARMSET_9600) == PARMSET_9600)
{
USpeed = SPEEDSEL_FLEX;
rt = TRUE;
}
}
// if baud rate is set correctly then change DS2480 speed
if (rt)
{
// check if correct mode
if (UMode != MODSEL_COMMAND)
{
UMode = MODSEL_COMMAND;
sendpacket[sendlen++] = MODE_COMMAND;
}
// proceed to set the DS2480 communication speed
sendpacket[sendlen++] = CMD_COMM | FUNCTSEL_SEARCHOFF | USpeed;
// send the packet
if (!WriteCOM(sendlen,sendpacket))
{
rt = FALSE;
// lost communication with DS2480 then reset
DS2480Detect();
}
}
}
// return the current speed
return (USpeed == SPEEDSEL_OD) ? MODE_OVERDRIVE : MODE_NORMAL;
}
//--------------------------------------------------------------------------
// This procedure creates a fixed 480 microseconds 12 volt pulse
// on the 1-Wire Net for programming EPROM iButtons.
//
// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
// OpenCOM to indicate the port number.
//
// Returns: TRUE successful
// FALSE program voltage not available
//
SMALLINT owProgramPulse(int portnum)
{
uchar sendpacket[10],readbuffer[10];
uchar sendlen=0;
// check if programming voltage available
if (!ProgramAvailable[portnum])
return FALSE;
// make sure normal level
owLevel(portnum,MODE_NORMAL);
// check if correct mode
if (UMode[portnum] != MODSEL_COMMAND)
{
UMode[portnum] = MODSEL_COMMAND;
sendpacket[sendlen++] = MODE_COMMAND;
}
// set the SPUD time value
sendpacket[sendlen++] = CMD_CONFIG | PARMSEL_12VPULSE | PARMSET_512us;
// pulse command
sendpacket[sendlen++] = CMD_COMM | FUNCTSEL_CHMOD | BITPOL_12V | SPEEDSEL_PULSE;
// flush the buffers
FlushCOM(portnum);
// send the packet
if (WriteCOM(portnum,sendlen,sendpacket))
{
// read back the 2 byte response
if (ReadCOM(portnum,2,readbuffer) == 2)
{
// check response byte
if (((readbuffer[0] | CMD_CONFIG) ==
(CMD_CONFIG | PARMSEL_12VPULSE | PARMSET_512us)) &&
((readbuffer[1] & 0xFC) ==
(0xFC & (CMD_COMM | FUNCTSEL_CHMOD | BITPOL_12V | SPEEDSEL_PULSE))))
return TRUE;
}
else
OWERROR(OWERROR_READCOM_FAILED);
}
else
OWERROR(OWERROR_WRITECOM_FAILED);
// an error occurred so re-sync with DS2480
DS2480Detect(portnum);
return FALSE;
}
//--------------------------------------------------------------------------
// Reset all of the devices on the 1-Wire Net and return the result.
//
// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
// OpenCOM to indicate the port number.
//
// Returns: TRUE(1): presense pulse(s) detected, device(s) reset
// FALSE(0): no presense pulses detected
//
// WARNING: This routine will not function correctly on some
// Alarm reset types of the DS1994/DS1427/DS2404 with
// Rev 1,2, and 3 of the DS2480/DS2480B.
//
SMALLINT owTouchReset(int portnum)
{
uchar readbuffer[10],sendpacket[10];
uchar sendlen=0;
// make sure normal level
owLevel(portnum,MODE_NORMAL);
// check if correct mode
if (UMode[portnum] != MODSEL_COMMAND)
{
UMode[portnum] = MODSEL_COMMAND;
sendpacket[sendlen++] = MODE_COMMAND;
}
// construct the command
sendpacket[sendlen++] = (uchar)(CMD_COMM | FUNCTSEL_RESET | USpeed[portnum]);
// flush the buffers
FlushCOM(portnum);
// send the packet
if (WriteCOM(portnum,sendlen,sendpacket))
{
// read back the 1 byte response
if (ReadCOM(portnum,1,readbuffer) == 1)
{
// make sure this byte looks like a reset byte
if (((readbuffer[0] & RB_RESET_MASK) == RB_PRESENCE) ||
((readbuffer[0] & RB_RESET_MASK) == RB_ALARMPRESENCE))
{
// check if programming voltage available
ProgramAvailable[portnum] = ((readbuffer[0] & 0x20) == 0x20);
return TRUE;
}
else
OWERROR(OWERROR_RESET_FAILED);
}
else
OWERROR(OWERROR_READCOM_FAILED);
}
else
OWERROR(OWERROR_WRITECOM_FAILED);
// an error occurred so re-sync with DS2480
DS2480Detect(portnum);
return FALSE;
}
//--------------------------------------------------------------------------
// This procedure creates a fixed 480 microseconds 12 volt pulse
// on the MicroLAN for programming EPROM iButtons.
//
// Returns: TRUE successful
// FALSE program voltage not available
//
int MLanProgramPulse(void)
{
uchar sendpacket[10],readbuffer[10];
short sendlen=0;
// check if programming voltage available
if (!ProgramAvailable)
return FALSE;
// make sure normal level
MLanLevel(MODE_NORMAL);
// check if correct mode
if (UMode != MODSEL_COMMAND)
{
UMode = MODSEL_COMMAND;
sendpacket[sendlen++] = MODE_COMMAND;
}
// set the SPUD time value
sendpacket[sendlen++] = CMD_CONFIG | PARMSEL_12VPULSE | PARMSET_512us;
// pulse command
sendpacket[sendlen++] = CMD_COMM | FUNCTSEL_CHMOD | BITPOL_12V | SPEEDSEL_PULSE;
// flush the buffers
FlushCOM();
// send the packet
if (WriteCOM(sendlen,sendpacket))
{
// read back the 2 byte response
if (ReadCOM(2,readbuffer) == 2)
{
// check response byte
if (((readbuffer[0] | CMD_CONFIG) ==
(CMD_CONFIG | PARMSEL_12VPULSE | PARMSET_512us)) &&
((readbuffer[1] & 0xFC) ==
(0xFC & (CMD_COMM | FUNCTSEL_CHMOD | BITPOL_12V | SPEEDSEL_PULSE))))
return TRUE;
}
}
// an error occured so re-sync with DS2480
DS2480Detect();
return FALSE;
}
//--------------------------------------------------------------------------
// Send 1 bit of communication to the 1-Wire Net and return the
// result 1 bit read from the 1-Wire Net. The parameter 'sendbit'
// least significant bit is used and the least significant bit
// of the result is the return bit.
//
// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
// OpenCOM to indicate the port number.
// 'sendbit' - the least significant bit is the bit to send
//
// Returns: 0: 0 bit read from sendbit
// 1: 1 bit read from sendbit
//
SMALLINT owTouchBit(int portnum, SMALLINT sendbit)
{
uchar readbuffer[10],sendpacket[10];
uchar sendlen=0;
// make sure normal level
owLevel(portnum,MODE_NORMAL);
// check if correct mode
if (UMode[portnum] != MODSEL_COMMAND)
{
UMode[portnum] = MODSEL_COMMAND;
sendpacket[sendlen++] = MODE_COMMAND;
}
// construct the command
sendpacket[sendlen] = (sendbit != 0) ? BITPOL_ONE : BITPOL_ZERO;
sendpacket[sendlen++] |= CMD_COMM | FUNCTSEL_BIT | USpeed[portnum];
// flush the buffers
FlushCOM(portnum);
// send the packet
if (WriteCOM(portnum,sendlen,sendpacket))
{
// read back the response
if (ReadCOM(portnum,1,readbuffer) == 1)
{
// interpret the response
if (((readbuffer[0] & 0xE0) == 0x80) &&
((readbuffer[0] & RB_BIT_MASK) == RB_BIT_ONE))
return 1;
else
return 0;
}
else
OWERROR(OWERROR_READCOM_FAILED);
}
else
OWERROR(OWERROR_WRITECOM_FAILED);
// an error occurred so re-sync with DS2480
DS2480Detect(portnum);
return 0;
}
//--------------------------------------------------------------------------
// Reset all of the devices on the MicroLAN and return the result.
//
// Returns: TRUE(1): presense pulse(s) detected, device(s) reset
// FALSE(0): no presense pulses detected
//
// WARNING: This routine will not function correctly on some
// Alarm reset types of the DS1994/DS1427/DS2404 with
// Rev 1 and 2 of the DS2480.
//
int MLanTouchReset(void)
{
uchar readbuffer[10],sendpacket[10];
int sendlen=0;
// make sure normal level
MLanLevel(MODE_NORMAL);
// check if correct mode
if (UMode != MODSEL_COMMAND)
{
UMode = MODSEL_COMMAND;
sendpacket[sendlen++] = MODE_COMMAND;
}
// construct the command
sendpacket[sendlen++] = (uchar)(CMD_COMM | FUNCTSEL_RESET | USpeed);
// flush the buffers
FlushCOM();
// send the packet
if (WriteCOM(sendlen,sendpacket))
{
// read back the 1 byte response
if (ReadCOM(1,readbuffer) == 1)
{
// make sure this byte looks like a reset byte
if (((readbuffer[0] & RB_RESET_MASK) == RB_PRESENCE) ||
((readbuffer[0] & RB_RESET_MASK) == RB_ALARMPRESENCE))
{
// check if programming voltage available
ProgramAvailable = ((readbuffer[0] & 0x20) == 0x20);
return TRUE;
}
else
return FALSE;
}
}
// an error occured so re-sync with DS2480
DS2480Detect();
return FALSE;
}
//--------------------------------------------------------------------------
// Send 8 bits of communication to the 1-Wire Net and return the
// result 8 bits read from the 1-Wire Net. The parameter 'sendbyte'
// least significant 8 bits are used and the least significant 8 bits
// of the result is the return byte.
//
// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
// OpenCOM to indicate the port number.
// 'sendbyte' - 8 bits to send (least significant byte)
//
// Returns: 8 bits read from sendbyte
//
SMALLINT owTouchByte(int portnum, SMALLINT sendbyte)
{
uchar readbuffer[10],sendpacket[10];
uchar sendlen=0;
// make sure normal level
owLevel(portnum,MODE_NORMAL);
// check if correct mode
if (UMode[portnum] != MODSEL_DATA)
{
UMode[portnum] = MODSEL_DATA;
sendpacket[sendlen++] = MODE_DATA;
}
// add the byte to send
sendpacket[sendlen++] = (uchar)sendbyte;
// check for duplication of data that looks like COMMAND mode
if (sendbyte ==(SMALLINT)MODE_COMMAND)
sendpacket[sendlen++] = (uchar)sendbyte;
// flush the buffers
FlushCOM(portnum);
// send the packet
if (WriteCOM(portnum,sendlen,sendpacket))
{
// read back the 1 byte response
if (ReadCOM(portnum,1,readbuffer) == 1)
{
// return the response
return (int)readbuffer[0];
}
else
OWERROR(OWERROR_READCOM_FAILED);
}
else
OWERROR(OWERROR_WRITECOM_FAILED);
// an error occurred so re-sync with DS2480
DS2480Detect(portnum);
return 0;
}
//---------------------------------------------------------------------------
// Attempt to acquire a 1-Wire net using a com port and a DS2480 based
// adapter.
//
// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
// OpenCOM to indicate the port number.
// 'port_zstr' - zero terminated port name. For this platform
// use format COMX where X is the port number.
//
// Returns: TRUE - success, COM port opened
//
// exportable functions defined in ownetu.c
SMALLINT owAcquire(int portnum, char *port_zstr)
{
// attempt to open the communications port
if (OpenCOM(portnum,port_zstr) < 0)
{
OWERROR(OWERROR_OPENCOM_FAILED);
return FALSE;
}
// detect DS2480
if (!DS2480Detect(portnum))
{
CloseCOM(portnum);
//OWERROR(OWERROR_DS2480_NOT_DETECTED);
return FALSE;
}
return TRUE;
}
//--------------------------------------------------------------------------
// Send 1 bit of communication to the MicroLAN and return the
// result 1 bit read from the MicroLAN. The parameter 'sendbit'
// least significant bit is used and the least significant bit
// of the result is the return bit.
//
// 'sendbit' - the least significant bit is the bit to send
//
// Returns: 0: 0 bit read from sendbit
// 1: 1 bit read from sendbit
//
int MLanTouchBit(int sendbit)
{
uchar readbuffer[10],sendpacket[10];
int sendlen=0;
// make sure normal level
MLanLevel(MODE_NORMAL);
// check if correct mode
if (UMode != MODSEL_COMMAND)
{
UMode = MODSEL_COMMAND;
sendpacket[sendlen++] = MODE_COMMAND;
}
// construct the command
sendpacket[sendlen] = (sendbit != 0) ? BITPOL_ONE : BITPOL_ZERO;
sendpacket[sendlen++] |= CMD_COMM | FUNCTSEL_BIT | USpeed;
// flush the buffers
FlushCOM();
// send the packet
if (WriteCOM(sendlen,sendpacket))
{
// read back the response
if (ReadCOM(1,readbuffer) == 1)
{
// interpret the response
if (((readbuffer[0] & 0xE0) == 0x80) &&
((readbuffer[0] & RB_BIT_MASK) == RB_BIT_ONE))
return 1;
else
return 0;
}
}
// an error occured so re-sync with DS2480
DS2480Detect();
return 0;
}
//--------------------------------------------------------------------------
// Send 8 bits of communication to the MicroLAN and return the
// result 8 bits read from the MicroLAN. The parameter 'sendbyte'
// least significant 8 bits are used and the least significant 8 bits
// of the result is the return byte.
//
// 'sendbyte' - 8 bits to send (least significant byte)
//
// Returns: 8 bytes read from sendbyte
//
int MLanTouchByte(int sendbyte)
{
uchar readbuffer[10],sendpacket[10];
int sendlen=0;
// make sure normal level
MLanLevel(MODE_NORMAL);
// check if correct mode
if (UMode != MODSEL_DATA)
{
UMode = MODSEL_DATA;
sendpacket[sendlen++] = MODE_DATA;
}
// add the byte to send
sendpacket[sendlen++] = (uchar)sendbyte;
// check for duplication of data that looks like COMMAND mode
if (sendbyte == MODE_COMMAND)
sendpacket[sendlen++] = (uchar)sendbyte;
// flush the buffers
FlushCOM();
// send the packet
if (WriteCOM(sendlen,sendpacket))
{
// read back the 1 byte response
if (ReadCOM(1,readbuffer) == 1)
{
// return the response
return (int)readbuffer[0];
}
}
// an error occured so re-sync with DS2480
DS2480Detect();
return 0;
}
//---------------------------------------------------------------------------
// Attempt to acquire a 1-Wire net using a com port and a DS2480 based
// adapter.
//
// 'port_zstr' - zero terminated port name. For this platform
// use format COMX where X is the port number.
//
// Returns: valid handle, or -1 if an error occurred
//
// exportable functions defined in ownetu.c
//
int owAcquireEx(char *port_zstr)
{
int portnum;
// attempt to open the communications port
if ((portnum = OpenCOMEx(port_zstr)) < 0)
{
OWERROR(OWERROR_OPENCOM_FAILED);
return -1;
}
// detect DS2480
if (!DS2480Detect(portnum))
{
CloseCOM(portnum);
OWERROR(OWERROR_DS2480_NOT_DETECTED);
return -1;
}
return portnum;
}
//--------------------------------------------------------------------------
// Set the MicroLAN line level. The values for NewLevel are
// as follows:
//
// 'NewLevel' - new level defined as
// MODE_NORMAL 0x00
// MODE_STRONG5 0x02
// MODE_PROGRAM 0x04
// MODE_BREAK 0x08 (not supported)
//
// Returns: current MicroLAN level
//
int MLanLevel(int NewLevel)
{
uchar sendpacket[10],readbuffer[10];
short sendlen=0;
short rt=FALSE;
// check if need to change level
if (NewLevel != ULevel)
{
// check if just putting back to normal
if (NewLevel == MODE_NORMAL)
{
// check if correct mode
if (UMode != MODSEL_COMMAND)
{
UMode = MODSEL_COMMAND;
sendpacket[sendlen++] = MODE_COMMAND;
}
// stop pulse command
sendpacket[sendlen++] = MODE_STOP_PULSE;
// flush the buffers
FlushCOM();
// send the packet
if (WriteCOM(sendlen,sendpacket))
{
// read back the 1 byte response
if (ReadCOM(1,readbuffer) == 1)
{
// check response byte
if ((readbuffer[0] & 0xE0) == 0xE0)
{
rt = TRUE;
ULevel = MODE_NORMAL;
}
}
}
}
// set new level
else
{
// check if correct mode
if (UMode != MODSEL_COMMAND)
{
UMode = MODSEL_COMMAND;
sendpacket[sendlen++] = MODE_COMMAND;
}
// strong 5 volts
if (NewLevel == MODE_STRONG5)
{
// set the SPUD time value
sendpacket[sendlen++] = CMD_CONFIG | PARMSEL_5VPULSE | PARMSET_infinite;
// add the command to begin the pulse
sendpacket[sendlen++] = CMD_COMM | FUNCTSEL_CHMOD | SPEEDSEL_PULSE | BITPOL_5V;
}
// 12 volts
else if (NewLevel == MODE_PROGRAM)
{
// check if programming voltage available
if (!ProgramAvailable)
return MODE_NORMAL;
// set the PPD time value
sendpacket[sendlen++] = CMD_CONFIG | PARMSEL_12VPULSE | PARMSET_infinite;
// add the command to begin the pulse
sendpacket[sendlen++] = CMD_COMM | FUNCTSEL_CHMOD | SPEEDSEL_PULSE | BITPOL_12V;
}
// flush the buffers
FlushCOM();
// send the packet
if (WriteCOM(sendlen,sendpacket))
{
// read back the 1 byte response from setting time limit
if (ReadCOM(1,readbuffer) == 1)
{
// check response byte
if ((readbuffer[0] & 0x81) == 0)
{
ULevel = NewLevel;
rt = TRUE;
}
}
}
}
// if lost communication with DS2480 then reset
if (rt != TRUE)
DS2480Detect();
}
// return the current level
return ULevel;
}
//--------------------------------------------------------------------------
// Set the 1-Wire Net communucation speed.
//
// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
// OpenCOM to indicate the port number.
// 'new_speed' - new speed defined as
// MODE_NORMAL 0x00
// MODE_OVERDRIVE 0x01
//
// Returns: current 1-Wire Net speed
//
SMALLINT owSpeed(int portnum, SMALLINT new_speed)
{
uchar sendpacket[5];
uchar sendlen=0;
uchar rt = FALSE;
// check if change from current mode
if (((new_speed == MODE_OVERDRIVE) &&
(USpeed[portnum] != SPEEDSEL_OD)) ||
((new_speed == MODE_NORMAL) &&
(USpeed[portnum] != SPEEDSEL_FLEX)))
{
if (new_speed == MODE_OVERDRIVE)
{
// if overdrive then switch to 115200 baud
if (DS2480ChangeBaud(portnum,PARMSET_115200) == PARMSET_115200)
{
USpeed[portnum] = SPEEDSEL_OD;
rt = TRUE;
}
}
else if (new_speed == MODE_NORMAL)
{
// else normal so set to 9600 baud
if (DS2480ChangeBaud(portnum,PARMSET_9600) == PARMSET_9600)
{
USpeed[portnum] = SPEEDSEL_FLEX;
rt = TRUE;
}
}
// if baud rate is set correctly then change DS2480 speed
if (rt)
{
// check if correct mode
if (UMode[portnum] != MODSEL_COMMAND)
{
UMode[portnum] = MODSEL_COMMAND;
sendpacket[sendlen++] = MODE_COMMAND;
}
// proceed to set the DS2480 communication speed
sendpacket[sendlen++] = CMD_COMM | FUNCTSEL_SEARCHOFF | USpeed[portnum];
// send the packet
if (!WriteCOM(portnum,sendlen,sendpacket))
{
OWERROR(OWERROR_WRITECOM_FAILED);
rt = FALSE;
// lost communication with DS2480 then reset
DS2480Detect(portnum);
}
}
}
// return the current speed
return (USpeed[portnum] == SPEEDSEL_OD) ? MODE_OVERDRIVE : MODE_NORMAL;
}
//--------------------------------------------------------------------------
// The 'owNext' function does a general search. This function
// continues from the previos search state. The search state
// can be reset by using the 'owFirst' function.
// This function contains one parameter 'alarm_only'.
// When 'alarm_only' is TRUE (1) the find alarm command
// 0xEC is sent instead of the normal search command 0xF0.
// Using the find alarm command 0xEC will limit the search to only
// 1-Wire devices that are in an 'alarm' state.
//
// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
// OpenCOM to indicate the port number.
// 'do_reset' - TRUE (1) perform reset before search, FALSE (0) do not
// perform reset before search.
// 'alarm_only' - TRUE (1) the find alarm command 0xEC is
// sent instead of the normal search command 0xF0
//
// Returns: TRUE (1) : when a 1-Wire device was found and it's
// Serial Number placed in the global SerialNum
// FALSE (0): when no new device was found. Either the
// last search was the last device or there
// are no devices on the 1-Wire Net.
//
SMALLINT owNext(int portnum, SMALLINT do_reset, SMALLINT alarm_only)
{
uchar last_zero,pos;
uchar tmp_serial_num[8];
uchar readbuffer[20],sendpacket[40];
uchar i,sendlen=0;
uchar lastcrc8;
// if the last call was the last one
if (LastDevice[portnum])
{
// reset the search
LastDiscrepancy[portnum] = 0;
LastDevice[portnum] = FALSE;
LastFamilyDiscrepancy[portnum] = 0;
return FALSE;
}
// check if reset first is requested
if (do_reset)
{
// reset the 1-wire
// if there are no parts on 1-wire, return FALSE
if (!owTouchReset(portnum))
{
// reset the search
LastDiscrepancy[portnum] = 0;
LastFamilyDiscrepancy[portnum] = 0;
OWERROR(OWERROR_NO_DEVICES_ON_NET);
return FALSE;
}
}
// build the command stream
// call a function that may add the change mode command to the buff
// check if correct mode
if (UMode[portnum] != MODSEL_DATA)
{
UMode[portnum] = MODSEL_DATA;
sendpacket[sendlen++] = MODE_DATA;
}
// search command
if (alarm_only)
sendpacket[sendlen++] = 0xEC; // issue the alarming search command
else
sendpacket[sendlen++] = 0xF0; // issue the search command
// change back to command mode
UMode[portnum] = MODSEL_COMMAND;
sendpacket[sendlen++] = MODE_COMMAND;
// search mode on
sendpacket[sendlen++] = (uchar)(CMD_COMM | FUNCTSEL_SEARCHON | USpeed[portnum]);
// change back to data mode
UMode[portnum] = MODSEL_DATA;
sendpacket[sendlen++] = MODE_DATA;
// set the temp Last Descrep to none
last_zero = 0;
// add the 16 bytes of the search
pos = sendlen;
for (i = 0; i < 16; i++)
sendpacket[sendlen++] = 0;
// only modify bits if not the first search
if (LastDiscrepancy[portnum] != 0)
{
// set the bits in the added buffer
for (i = 0; i < 64; i++)
{
// before last discrepancy
if (i < (LastDiscrepancy[portnum] - 1))
bitacc(WRITE_FUNCTION,
bitacc(READ_FUNCTION,0,i,&SerialNum[portnum][0]),
(short)(i * 2 + 1),
&sendpacket[pos]);
// at last discrepancy
else if (i == (LastDiscrepancy[portnum] - 1))
bitacc(WRITE_FUNCTION,1,
(short)(i * 2 + 1),
&sendpacket[pos]);
// after last discrepancy so leave zeros
}
}
// change back to command mode
UMode[portnum] = MODSEL_COMMAND;
sendpacket[sendlen++] = MODE_COMMAND;
// search OFF
sendpacket[sendlen++] = (uchar)(CMD_COMM | FUNCTSEL_SEARCHOFF | USpeed[portnum]);
// flush the buffers
FlushCOM(portnum);
// send the packet
if (WriteCOM(portnum,sendlen,sendpacket))
{
// read back the 1 byte response
if (ReadCOM(portnum,17,readbuffer) == 17)
{
// interpret the bit stream
for (i = 0; i < 64; i++)
{
// get the SerialNum bit
bitacc(WRITE_FUNCTION,
bitacc(READ_FUNCTION,0,(short)(i * 2 + 1),&readbuffer[1]),
i,
&tmp_serial_num[0]);
// check LastDiscrepancy
if ((bitacc(READ_FUNCTION,0,(short)(i * 2),&readbuffer[1]) == 1) &&
(bitacc(READ_FUNCTION,0,(short)(i * 2 + 1),&readbuffer[1]) == 0))
{
last_zero = i + 1;
// check LastFamilyDiscrepancy
if (i < 8)
LastFamilyDiscrepancy[portnum] = i + 1;
}
}
// do dowcrc
setcrc8(portnum,0);
// for (i = 0; i < 8; i++)
// lastcrc8 = docrc8(portnum,tmp_serial_num[i]);
// The above has been commented out for the DS28E04. The
// below has been added to accomidate the valid CRC with the
// possible changing serial number values of the DS28E04.
for (i = 0; i < 8; i++)
{
if (((tmp_serial_num[0] & 0x7F) == 0x1C) && (i == 1))
lastcrc8 = docrc8(portnum,0x7F);
else
lastcrc8 = docrc8(portnum,tmp_serial_num[i]);
}
// check results
if ((lastcrc8 != 0) || (LastDiscrepancy[portnum] == 63) || (tmp_serial_num[0] == 0))
{
// error during search
// reset the search
LastDiscrepancy[portnum] = 0;
LastDevice[portnum] = FALSE;
LastFamilyDiscrepancy[portnum] = 0;
OWERROR(OWERROR_SEARCH_ERROR);
return FALSE;
}
// successful search
else
{
// set the last discrepancy
LastDiscrepancy[portnum] = last_zero;
// check for last device
if (LastDiscrepancy[portnum] == 0)
LastDevice[portnum] = TRUE;
// copy the SerialNum to the buffer
for (i = 0; i < 8; i++)
SerialNum[portnum][i] = tmp_serial_num[i];
// set the count
return TRUE;
}
}
else
OWERROR(OWERROR_READCOM_FAILED);
}
else
OWERROR(OWERROR_WRITECOM_FAILED);
// an error occured so re-sync with DS2480
DS2480Detect(portnum);
// reset the search
LastDiscrepancy[portnum] = 0;
LastDevice[portnum] = FALSE;
LastFamilyDiscrepancy[portnum] = 0;
return FALSE;
}