void RomReadCode(uchar RomCode[])
{
uchar i;
for(i=0;i<8;i++)
{
RomCode[i]=owReadByte(0);
// printf("text%d\n",i);
}
}
//----------------------------------------------------------------------
// This is the Main routine for swtmain1c
//
int main(short argc, char **argv)
{
char msg[200];
uchar data[256];
int portnum = 0;
int n=0;
int addr = 0;
int len;
uchar es = 0x00;
uchar address[2];
ushort i;
uchar sn[8],state[3], reg[3], send_block[37];
uchar family[2][8];
int done=FALSE;
int channel=0,send_cnt=0;
SMALLINT alternate=TRUE, alt=FALSE;
ushort lastcrc16;
uchar latch, set;
uchar check;
// check for required port name
if (argc != 2)
{
sprintf(msg,"1-Wire Net name required on command line!\n"
" (example: \"COM1\" (Win32 DS2480),\"/dev/cua0\" "
"(Linux DS2480),\"1\" (Win32 TMEX)\n");
printf("%s",msg);
return 0;
}
if((portnum = owAcquireEx(argv[1])) < 0)
{
printf("Did not Acquire port.\n",1);
exit(1);
}
else
{
if(FindDevices(portnum,&family[0],0x1C,1))
{
for(i=0;i<8;i++)
sn[i] = family[0][i];
printf("device found: ");
for(i=0;i<8;i++)
printf("%02X ",sn[i]);
printf("\n");
do
{
printf("PICK AN OPERATION:\n\n");
printf("(1) Read Channel state\n"); // Gives channel information
printf("(2) Set Channel On/Off\n"); // Sets channel
printf("(3) Read Channel Mask\n"); // Read Selection Mask
printf("(4) Set Channel mask\n"); // Sets channel mask
printf("(5) Read Channel Polarity\n"); // Read Polarity Selection
printf("(6) Set Channel polarity\n"); // sets channel polarity
printf("(7) Read Control/Status Register\n"); // Read Control/Status Reg
printf("(8) Set Reset Mode On/Off\n"); // Set Reset Mode
printf("(9) Clear Power on Reset\n"); // Clear Power on reset
printf("(10) Get VCC state\n"); // Get VCC state
printf("(11) Set OR conditional search\n"); // or condition search
printf("(12) Set AND conditional search\n"); // and condition search
printf("(13) Write Scratchpad\n"); // write scratchpad command
printf("(14) Read Scratchpad\n"); // read scratchpad command
printf("(15) Copy Scratchpad\n"); // copy scratchpad command
printf("(16) Read Memory\n"); // read memory
printf("(17) PIO access read with CRC confirmation\n"); // access read
printf("(18) LED test\n"); // LED test
printf("(19) QUIT\n");
scanf("%d",&n);
if(n == 19)
{
n = 0; //used to finish off the loop
done = TRUE;
break;
}
switch(n)
{
case 1: // Channel Info
printf("\nEnter the channel\n");
scanf("%d",&channel);
if(readSwitch1C(portnum,&sn[0],&state[0]))
{
printf("The channel is ");
if(getLatchState1C(channel,&state[0]))
printf("on.\n");
else
printf("off\n");
printf("The Level is ");
if(getLevel1C(channel,&state[0]))
printf("high.\n");
else
printf("low.\n");
if(getSensedActivity1C(channel,&state[0]))
printf("Activity was detected on the channel.\n\n");
else
printf("No activity was detected on the channel.\n\n");
}
else
OWERROR_DUMP(stdout);
break;
case 2: // Sets channel
printf("\nEnter the channel\n");
scanf("%d",&channel);
printf("Turn channel off enter 0, on 1.\n");
scanf("%d",&set);
if(setLatchState1C(portnum,&sn[0],channel,set))
{
printf("Latch was set ");
if(set)
printf("on.\n");
else
printf("off.\n");
}
else
OWERROR_DUMP(stdout);
break;
case 3: // Read Selection Mask
printf("\nEnter the channel\n");
scanf("%d",&channel);
if(readRegister1C(portnum,&sn[0],®[0]))
{
printf("register is %02X %02X %02X\n",reg[0],reg[1],reg[2]);
printf("The Selection Mask for channel %d is ",channel);
latch = (uchar) (0x01 << channel);
if((reg[0] & latch) == latch)
printf("set.\n\n");
else
printf("not set.\n\n");
}
else
OWERROR_DUMP(stdout);
break;
case 4: // Sets channel mask
printf("\nEnter the channel\n");
scanf("%d",&channel);
printf("Turn channel mask off enter 0, on 1.\n");
scanf("%d",&set);
if(setChannelMask1C(portnum,&sn[0],channel,set))
{
printf("The mask for channel %d was set ",channel);
if(set)
printf("on.\n\n");
else
printf("off.\n\n");
}
else
OWERROR_DUMP(stdout);
break;
case 5: // Read Polarity Selection
printf("\nEnter the channel\n");
scanf("%d",&channel);
printf("The Polarity for channel %d is ",channel);
if(getChannelPolarity1C(portnum,&sn[0],channel))
printf("set.\n\n");
else
printf("not set.\n\n");
break;
case 6: // sets channel polarity
printf("\nEnter the channel\n");
scanf("%d",&channel);
printf("Turn channel polarity off enter 0, on 1.\n");
scanf("%d",&set);
if(setChannelPolarity1C(portnum,&sn[0],channel,set))
{
printf("The polarity for channel %d was set ",channel);
if(set)
printf("on.\n\n");
else
printf("off.\n\n");
}
else
OWERROR_DUMP(stdout);
break;
case 7: // Read Control/Status Reg
if(readRegister1C(portnum,&sn[0],®[0]))
printf("The Constrol/Status register is as following in hex %02X\n\n",
reg[2]);
else
OWERROR_DUMP(stdout);
break;
case 8: // Set Reset Mode
printf("Turn reset mode off enter 0, on 1.\n");
scanf("%d",&set);
if(setResetMode1C(portnum,&sn[0],set))
{
printf("Reset Mode was turned ");
if(set)
printf("on.\n\n");
else
printf("off.\n\n");
}
else
OWERROR_DUMP(stdout);
break;
case 9: // Clear Power on reset
if(clearPowerOnReset1C(portnum,&sn[0]))
printf("Power on reset was cleared.\n\n");
else
OWERROR_DUMP(stdout);
break;
case 10: // Get VCC state
if(readRegister1C(portnum,&sn[0],®[0]))
{
printf("VCC state register is %02X\n",reg[2]);
if(getVCC1C(®[0]))
printf("VCC is powered.\n\n");
else
printf("VCC is grounded.\n\n");
}
else
OWERROR_DUMP(stdout);
break;
case 11: // or condition search
if(orConditionalSearch1C(portnum,&sn[0]))
printf("OR condition search was set.\n\n");
else
OWERROR_DUMP(stdout);
break;
case 12: // and condition search
if(andConditionalSearch1C(portnum,&sn[0]))
printf("AND condition search was set.\n\n");
else
OWERROR_DUMP(stdout);
break;
case 13: // write scratchpad
printf("Enter the address to start writing: ");
addr = getNumber(0, 550);
if(menuSelect(&sn[0]) == MODE_TEXT)
len = getData(data,MAX_LEN,MODE_TEXT);
else
len = getData(data,MAX_LEN,MODE_HEX);
if(!writeScratch1C(portnum,&sn[0],addr,len,&data[0]))
OWERROR_DUMP(stdout);
break;
case 14: // read scratchpad
if(!readScratch1C(portnum,&sn[0],&len,&es,&address[0],&data[0]))
{
printf("error\n");
OWERROR_DUMP(stdout);
}
else
{
printf("Address bytes: %02X %02X\n",address[0],address[1]);
printf("ES byte: %02X\n",es);
printf("Length: %d\n",len);
printf("Scratchpad data: ");
for(i=0;i<len;i++)
printf("%02X ",data[i]);
printf("\n");
}
break;
case 15: // copy scratchpad
if(!copyScratch1C(portnum,&sn[0]))
{
OWERROR_DUMP(stdout);
}
else
{
printf("Copy Scratchpad Complete.\n");
}
break;
case 16: // read memory
printf("Enter the address to start reading: ");
addr = getNumber(0, 550);
printf("Enter the length you want to read: ");
len = getNumber(0,256);
if(!read1C(portnum,&sn[0],addr,len,&data[0]))
{
OWERROR_DUMP(stdout);
}
else
{
for(i=0;i<len;i++)
printf("%02X ",data[i]);
printf("\n");
}
break;
case 17: // and condition search
if (!owTouchReset(portnum))
OWERROR_DUMP(stdout);
if(!owWriteByte(portnum,0xCC))
printf("skip rom error.\n");
owWriteByte(portnum,0xF5);
for(i=0;i<34;i++)
send_block[send_cnt++] = 0xFF;
if(!owBlock(portnum,FALSE,&send_block[0],send_cnt))
{
OWERROR(OWERROR_BLOCK_FAILED);
return FALSE;
}
setcrc16(portnum,0);
lastcrc16 = docrc16(portnum,0xF5);
for(i=0;i<34;i++)
lastcrc16 = docrc16(portnum,send_block[i]);
if(lastcrc16 != 0xB001)
printf("CRC didn't match.\n");
printf("read data: ");
for(i=0;i<34;i++)
printf("%02X ",send_block[i]);
printf("\n");
send_cnt = 0;
for(i=0;i<34;i++)
send_block[send_cnt++] = 0xFF;
if(!owBlock(portnum,FALSE,&send_block[0],send_cnt))
{
OWERROR(OWERROR_BLOCK_FAILED);
return FALSE;
}
setcrc16(portnum,0);
for(i=0;i<34;i++)
lastcrc16 = docrc16(portnum,send_block[i]);
if(lastcrc16 != 0xB001)
printf("CRC2 didn't match.\n");
printf("read data2: ");
for(i=0;i<34;i++)
printf("%02X ",send_block[i]);
printf("\n");
send_cnt = 0;
for(i=0;i<34;i++)
send_block[send_cnt++] = 0xFF;
if(!owBlock(portnum,FALSE,&send_block[0],send_cnt))
{
OWERROR(OWERROR_BLOCK_FAILED);
return FALSE;
}
setcrc16(portnum,0);
for(i=0;i<34;i++)
lastcrc16 = docrc16(portnum,send_block[i]);
if(lastcrc16 != 0xB001)
printf("CRC3 didn't match.\n");
printf("read data3: ");
for(i=0;i<34;i++)
printf("%02X ",send_block[i]);
printf("\n");
break;
case 18: // LED test
printf("\nEnter the channel to turn the LED on.\n");
scanf("%d",&channel);
printf("Turn reset mode off enter 1, on 0.\n");
scanf("%d",&set);
printf("Alternate on and off 0=No, 1=Yes.\n");
scanf("%d",&alternate);
if (!owTouchReset(portnum))
OWERROR_DUMP(stdout);
if(!owWriteByte(portnum,0xCC))
printf("skip rom error.\n");
owWriteByte(portnum,0x5A);
for(i=0;i<256;i++)
{
if(channel == 0)
{
if(set == 0)
{
if(!alternate)
{
if(!owWriteByte(portnum,0xFE))
printf("write byte error.\n");
if(!owWriteByte(portnum,0x01))
printf("write byte error.\n");
check = 0xFE;
}
else
{
if(alt)
{
if(!owWriteByte(portnum,0xFE))
printf("write byte error.\n");
if(!owWriteByte(portnum,0x01))
printf("write byte error.\n");
check = 0xFE;
alt = FALSE;
}
else
{
if(!owWriteByte(portnum,0xFF))
printf("write byte error.\n");
if(!owWriteByte(portnum,0x00))
printf("write byte error.\n");
check = 0xFF;
alt = TRUE;
}
}
}
else
{
if(!alternate)
{
if(!owWriteByte(portnum,0xFF))
printf("write byte error.\n");
if(!owWriteByte(portnum,0x00))
printf("write byte error.\n");
check = 0xFF;
}
else
{
if(alt)
{
if(!owWriteByte(portnum,0xFE))
printf("write byte error.\n");
if(!owWriteByte(portnum,0x01))
printf("write byte error.\n");
check = 0xFE;
alt = FALSE;
}
else
{
if(!owWriteByte(portnum,0xFF))
printf("write byte error.\n");
if(!owWriteByte(portnum,0x00))
printf("write byte error.\n");
check = 0xFF;
alt = TRUE;
}
}
}
}
else
{
if(set == 0)
{
if(!alternate)
{
if(!owWriteByte(portnum,0xFD))
printf("write byte error.\n");
if(!owWriteByte(portnum,0x02))
printf("write byte error.\n");
check = 0xFD;
}
else
{
if(alt)
{
if(!owWriteByte(portnum,0xFD))
printf("write byte error.\n");
if(!owWriteByte(portnum,0x02))
printf("write byte error.\n");
check = 0xFD;
alt = FALSE;
}
else
{
if(!owWriteByte(portnum,0xFF))
printf("write byte error.\n");
if(!owWriteByte(portnum,0x00))
printf("write byte error.\n");
check = 0xFF;
alt = TRUE;
}
}
}
else
{
if(!alternate)
{
if(!owWriteByte(portnum,0xFF))
printf("write byte error.\n");
if(!owWriteByte(portnum,0x00))
printf("write byte error.\n");
check = 0xFF;
}
else
{
if(alt)
{
if(!owWriteByte(portnum,0xFD))
printf("write byte error.\n");
if(!owWriteByte(portnum,0x02))
printf("write byte error.\n");
check = 0xFD;
alt = FALSE;
}
else
{
if(!owWriteByte(portnum,0xFF))
printf("write byte error.\n");
if(!owWriteByte(portnum,0x00))
printf("write byte error.\n");
check = 0xFF;
alt = TRUE;
}
}
}
}
send_block[0] = (uchar)owReadByte(portnum);
send_block[1] = (uchar)owReadByte(portnum);
if((send_block[0] != 0xAA) && (send_block[1] != check))
printf("confirmation byte was %02X and read back was %02X\n",
send_block[0],send_block[1]);
}
default:
break;
}
}while(!done);
}
else
printf("DS28E04 not found on One Wire Network\n");
owRelease(portnum);
}
return 1;
}
/*
SetupVsens
setup DS2438 to read Vsens voltage difference
enable IAD, CA and EE of status configuration register ( page <0h> byte <0h>)
Vsens A/D conversion occurs with a frequency of 36.41 measurements/sec
once IAD is enabled ( set to '1'). No special command necessary.
input parameters
portnum port number
SNum serial number of DS2438
device device (USB DS2490 or serial DS9097U)
*/
int SetupVsens(int portnum, uchar *SNum, char *device)
{
uchar datablock[50];
uchar conf_reg = 0x00;
int send_cnt = 0;
int i;
ushort lastcrc8;
int busybyte;
double ti, tf;
struct timezone tz;
struct timeval tv;
gettimeofday( &tv, &tz);
ti = tv.tv_sec+1.0e-6*tv.tv_usec;
/* enable IAD, CA and EE of configuration byte */
conf_reg |= IAD | CA | EE;
owSerialNum(portnum,SNum,FALSE);
// Recall the Status/Configuration page
// Recall command
datablock[send_cnt++] = 0xB8;
// Page to Recall
datablock[send_cnt++] = 0x00;
if(!owBlock(portnum,FALSE,datablock,send_cnt))
return FALSE;
send_cnt = 0;
if(owAccess(portnum))
{
// Read the Status/Configuration byte
// Read scratchpad command
datablock[send_cnt++] = 0xBE;
// Page for the Status/Configuration byte
datablock[send_cnt++] = 0x00;
for(i=0;i<9;i++)
datablock[send_cnt++] = 0xFF;
if(owBlock(portnum,FALSE,datablock,send_cnt))
{
setcrc8(portnum,0);
for(i=2;i<send_cnt;i++)
lastcrc8 = docrc8(portnum,datablock[i]);
if(lastcrc8 != 0x00)
return FALSE;
}//Block
else
return FALSE;
if ( datablock[2] & conf_reg ) {
syslog(LOG_DEBUG, "SetupVsens: IAD, CA and EE are set: return!\n");
gettimeofday( &tv, &tz);
tf = tv.tv_sec+1.0e-6*tv.tv_usec;
syslog(LOG_DEBUG,
"SetupVsens: elapsed time: %f\n", tf -ti);
return TRUE;
} else {
syslog(LOG_DEBUG,
"SetupVsens: IAD, CA and EE are not set. Continue to setup\n");
}
}//Access
if(owAccess(portnum))
{
send_cnt = 0;
// Write the Status/Configuration byte
// Write scratchpad command
datablock[send_cnt++] = 0x4E;
// Write page
datablock[send_cnt++] = 0x00;
// IAD, CA and EE set to "1"
datablock[send_cnt++] |= conf_reg;
// do not change the rest
for(i=0;i<7;i++)
datablock[send_cnt++] = datablock[i+3];
if(owBlock(portnum,FALSE,datablock,send_cnt))
{
send_cnt = 0;
if(owAccess(portnum))
{
// Copy the Status/Configuration byte
// Copy scratchpad command
datablock[send_cnt++] = 0x48;
// Copy page
datablock[send_cnt++] = 0x00;
if(owBlock(portnum,FALSE,datablock,send_cnt))
{
busybyte = owReadByte(portnum);
while(busybyte == 0)
busybyte = owReadByte(portnum);
gettimeofday( &tv, &tz);
tf = tv.tv_sec+1.0e-6*tv.tv_usec;
syslog(LOG_DEBUG,
"SetupVsens: elapsed time: %f\n", tf -ti);
return TRUE;
}//Block
}//Access
}//Block
}//Access
return FALSE;
}
//----------------------------------------------------------------------
// Family 0x10 Demo
//
void main(void)
{
int temp;
int sign;
BYTE i;
//----------------------------------------
ADCON1 = 0x07; // PortB digital
bTRD6 = 1; // RD6 = Serial Input
bTRD7 = 0; // RD7 = Serial Output
bLD7 = 1;
printf("\nFamily 0x10 Demo\n%");
////////////////////////////////////////////////////////////
// Initialise the OneWire network (bus)
// attempt to acquire the 1-Wire Nets
if (!owAcquire(0, NULL)) {
printf("Acquire failed.\n%");
while(1)
;
}
////////////////////////////////////////////////////////////
// Let's set the alarmtemps of all devices on the bus.
// To demonstrate this, we write a low alarmtemp of 19
// and a high alarmtemp of 21 to all devices.
// Finally we copy the alarmtemps to non-volatile EEPROM.
printf("\nStart - Set AlarmTemperatures.\n%");
// Reset the devices
owTouchReset(0);
// Address all devices on the net
owWriteByte(0, OW_SKIPROM);
// Use the WriteScratchpad command to set AlarmTemps
owWriteByte(0, OW_WRITESCRATCHPAD);
owWriteByte(0, 19); // Valid RoomTemperature
owWriteByte(0, 21); // 19 <= Temp < 21
printf("End - Set AlarmTemperatures.\n%");
// Set alarmtemps done
// Copy the temps to EEPROM
printf("\nStart - Write AlarmTemperatures to EEPROM.\n%");
// Reset the devices
owTouchReset(0);
// Address all devices on the net
owWriteByte(0, OW_SKIPROM);
// send the CopyScratchpad command to copy the AlarmTemps to EEPROM
// If the bus supports Strong PullUp, we use it (because
// there might be parasite powered devices on this bus).
if(owHasPowerDelivery(0)) {
printf("The bus has a Strong PullUp\n%");
owWriteBytePower(0, OW_COPYSCRATCHPAD);
// Eeprom update takes 10 milliseconds max. 11ms is safer
Wait(11);
// turn off the strong pull-up
owLevel(0, MODE_NORMAL);
} else {
printf("The bus has NO Strong PullUp\n%");
owWriteByte(0, OW_COPYSCRATCHPAD);
// Eeprom update takes 10 milliseconds max. 11ms is safer
Wait(11);
}
printf("End - Write AlarmTemperatures to EEPROM.\n%");
// Copy the temps to EEPROM done
while(1) {
////////////////////////////////////////////////////////////
// We do a temp conversion on all DS18S20's
printf("\nStart - TemperatureConversions\n%");
// Reset the devices
owTouchReset(0);
// Address all devices on this net
owWriteByte(0, OW_SKIPROM);
// Send the convert command and start power delivery if available.
// Note that we use a different way here to determine
// Strong PullUp capability.
if(owWriteBytePower(0, OW_CONVERTT)) {
printf("We are using a Strong PullUp.\n%");
} else {
printf("No Strong PullUp configured.\n%");
owWriteByte(0, OW_CONVERTT);
}
// Coversion takes 750 milliseconds max. 751ms is safer
Wait(751);
// turn off the 1-Wire Net strong pull-up
owLevel(0, MODE_NORMAL);
printf("End - TemperatureConversions\n%");
////////////////////////////////////////////////////////////
// We will now demonstrate an alarmsearch
printf("\nStart - Find devices in alarmstate\n%");
// Find the devices with temp < 19 or temp >= 21
if(!owFirst(0, TRUE, TRUE)) {
printf("No devices in AlarmState found.\n%");
} else {
do {
printf("Device in AlarmState found: 0x%02X%02X%02X%02X%02X%02X%02X%02X\n%",
owNetCurrent.SerialNum[7],
owNetCurrent.SerialNum[6],
owNetCurrent.SerialNum[5],
owNetCurrent.SerialNum[4],
owNetCurrent.SerialNum[3],
owNetCurrent.SerialNum[2],
owNetCurrent.SerialNum[1],
owNetCurrent.SerialNum[0]);
} while(owNext(0, TRUE, TRUE));
}
printf("End - Find devices in alarmstate\n%");
////////////////////////////////////////////////////////////
// We will now demonstrate a normal search. For
// every device found, it's temperature is retrieved.
printf("\nStart - Find devices and get their temperatures.\n%");
if(!owFirst(0, TRUE, FALSE)) {
printf("No devices found.\n%");
} else {
do {
printf("Device found: 0x%02X%02X%02X%02X%02X%02X%02X%02X%",
owNetCurrent.SerialNum[7],
owNetCurrent.SerialNum[6],
owNetCurrent.SerialNum[5],
owNetCurrent.SerialNum[4],
owNetCurrent.SerialNum[3],
owNetCurrent.SerialNum[2],
owNetCurrent.SerialNum[1],
owNetCurrent.SerialNum[0]);
// Init the crc
setcrc8(0, 0);
// Read the device's memory
owWriteByte(0, OW_READSCRATCHPAD);
for(i = 0; i < SCRATCHPAD_SIZE; i++) {
ScratchPad[i] = owReadByte(0);
docrc8(0, ScratchPad[i]);
}
// Check the CRC
if(owNetCurrent.utilcrc8 != 0) {
printf(", crc is NOT OK.\n%");
} else {
// We don't want to use float's
temp = ((int)ScratchPad[SCRATCHPAD_TEMPERATUREMSB] << 8) |
(int)ScratchPad[SCRATCHPAD_TEMPERATURELSB];
if(temp < 0) {
temp = -temp;
sign = '-';
} else if(temp == 0) {
sign = ' ';
} else {
sign = '+';
}
printf(", Temperature is %c%d.%d degrees\n%",
sign,
(temp >> 1),
(temp & 0x01) ? 5 : 0);
}
} while(owNext(0, TRUE, FALSE));
}
printf("End - Find devices and get their temperatures.\n%");
////////////////////////////////////////////////////////////
Wait(1); // Just a convenient way to set a breakpoint
}
}
//----------------------------------------------------------------------
// Read the temperature of a DS18B20 (family code 0x28)
//
// 'portnum' - number 0 to MAX_PORTNUM-1. This number was provided to
// OpenCOM to indicate the port number.
// 'SerialNum' - Serial Number of DS18B20 to read temperature from
// 'Temp ' - pointer to variable where that temperature will be
// returned
//
// Returns: TRUE(1) temperature has been read and verified
// FALSE(0) could not read the temperature, perhaps device is not
// in contact
//
int ReadTemperature28(int portnum, uchar *SerialNum, float *Temp)
{
uchar rt=FALSE;
uchar send_block[30],lastcrc8;
int send_cnt, tsht, i, loop=0;
int power;
// set the device serial number to the counter device
owSerialNum(portnum,SerialNum,FALSE);
for (loop = 0; loop < 2; loop ++)
{
// check if the chip is connected to VDD
if (owAccess(portnum))
{
owWriteByte(portnum,0xB4);
power = owReadByte(portnum);
}
// access the device
if (owAccess(portnum))
{
// send the convert command and if nesessary start power delivery
if (power) {
if (!owWriteBytePower(portnum,0x44))
return FALSE;
} else {
if (!owWriteByte(portnum,0x44))
return FALSE;
}
// sleep for 1 second
msDelay(1000);
// turn off the 1-Wire Net strong pull-up
if (power) {
if (owLevel(portnum,MODE_NORMAL) != MODE_NORMAL)
return FALSE;
}
// access the device
if (owAccess(portnum))
{
// create a block to send that reads the temperature
// read scratchpad command
send_cnt = 0;
send_block[send_cnt++] = 0xBE;
// now add the read bytes for data bytes and crc8
for (i = 0; i < 9; i++)
send_block[send_cnt++] = 0xFF;
// now send the block
if (owBlock(portnum,FALSE,send_block,send_cnt))
{
// initialize the CRC8
setcrc8(portnum,0);
// perform the CRC8 on the last 8 bytes of packet
for (i = send_cnt - 9; i < send_cnt; i++)
lastcrc8 = docrc8(portnum,send_block[i]);
// verify CRC8 is correct
if (lastcrc8 == 0x00)
{
// calculate the high-res temperature
tsht = send_block[2] << 8;
tsht = tsht | send_block[1];
if (tsht & 0x00001000)
tsht = tsht | 0xffff0000;
*Temp = ((float) tsht)/16;
// success
rt = TRUE;
break;
}
}
}
}
}
// return the result flag rt
return rt;
}
