RS232 data to digital chart
Hi!
I past the last night trying to display a digital square wave en Labview...
I using Labview 7.1.1, in Windows XP SP2.
To adquire the data, i use a visa read function, after configurate the serial port.
In the hardware side, i have a PIC microntroller sending "1" and "0",
accord to the state of a digital signal in one of their inputs.
I correctly receive this data in string format, and i have no idea on how to convert this to
appropiate data for show in a digital waveform chart control.
I try scan from string, string to array, build array, build waveform, array to digital waveform...
Any help would be greatly appreciated
Best Regards,
Diego
I'm not sure if this is what you need. Could you post some data?? This is in 7.0 format.
Attachments:
string to digital waveform.vi 22 KB
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Display Data on waveform chart or XY graph over a long period of time
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The vi as you have constructed it has only one memory element, the chart history length (default is 1024.)
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Greetings Johannes
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Solved!
Go to Solution.Gerd,
thank you for the quick response and the easy solution.
Look what I did in the meantime. I solved the problem too, but muuuch more complicate :-)
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Message Edited by johanneshoer on 04-28-2009 10:39 AM
Greetings Johannes
Using LabVIEW 7.1 and 2009 recently
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VAL_UNSIGNED_SHORT_INTEGER, 1.0, 0.0, 0.0, 1.0,
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Most efficient way to constantly read, queue and parse multi-sized RS232 data (multi-threaded)
I've tried tackling this problem a few different ways, and figured it was time to get some others' advice. My system essentially works, although it looks like a hackjob and not entirely confident.
My RS-232 connection has the following properties/constraints:
-Will be getting unsolicited data at a high data rate. (ya thats subjective, but assume near constant at whatever baud rate its set at up to 115200)
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I tried implementing a FIFO type queue (copied below), but I have very little experience in doing this, and may not be very efficient in the way I implemented and could definately use some advice in this area. Also perhaps in how thread safe I have everything.
I thought about a circular buffer, but since data can be different segment lengths, it kind of makes it difficult to cleanly wrap around and read. I think its still possible, just may require additional checks which I haven't seen done anywhere when google searching. (and made me think a FIFO queue was better).
So if anyone has any good suggestions or examples, that would be great. Using Labwindows 2010.
//in Main before GUI loaded
programRunning = 1;
CmtScheduleThreadPoolFunction (DEFAULT_THREAD_POOL_HANDLE, ComCallback, NULL, &funcID);
/* Function Used to parse Com data */
static int ComCallback (void *callbackData)
static int bufLen = 0;
int strLen,qLen=0;
unsigned char tempBuf[1024];
int packet_length = 0;
char temp_string[250];
unsigned char *start_ptr;
int i;
int start_offset;
while(programRunning) {
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if( com_open) qLen = GetInQLen (comPort);
if( qLen <= 0 ) {
ProcessSystemEvents();
} else {
if( qLen > 1024) qLen = 1024-bufLen; //set max length to read
strLen = ComRd (comPort, tempBuf, qLen);
//CmtGetLock(lock);
memcpy(readBuf+bufLen,tempBuf,strLen);
bufLen += strLen;
//CmtReleaseLock(lock);
//Try to read until we hit stop bytes, or until we think we have at least 1 or 2 packets to process
if(tempBuf[strLen-2] != 0x10 && tempBuf[strLen-1] != 0x03 && bufLen < 100 ) )
goto skip;
//ensure start pointer is at beginning command (0x10 0xAA) (in event we just started reading in middle of packet???)
i = 0;
while ( (readBuf[i] != 0x10) && (readBuf[i+1] != 0xAA) && (i < strLen) )
//start_ptr++;
i++;
start_offset = i;
parse_some_more:
start_ptr = readBuf + start_offset;
//lets try to do one packet at a time.
for(i = start_offset; i < bufLen-start_offset-1; i++)
if(readBuf[i] == 0x10)
if(readBuf[i+1] == 0x03)
i += 2;
break;
//trial of unpacking/unstuffing byte buffer
else if( readBuf[i+1] == 0x10 ) //two tens in a row, remove it
memmove( &readBuf[i],&readBuf[i+1],bufLen-i);
bufLen--;
//at this point, we should have a full packet. What if we don't....???
packet_length = i - start_offset;
//CmtGetLock(lock);
ParseResponse(start_ptr,packet_length);
PostPacketToOutputBuffer(start_ptr,packet_length);
if(start_ptr[start_offset] == 0x10 && start_ptr[start_offset+1] == 0xAA )
com_Send_Acknowledge(comPort);
start_offset = packet_length + start_offset;
if(start_offset < bufLen-1)
goto parse_some_more;
//For now, assume everything else we don't care about in buffer, however, probably shouldn't. Should it be bufLen -=start_offset; if so, need to handle partial data better; timeout??
bufLen = 0;
//CmtReleaseLock(lock);
skip:
return 0;
Thanks!Hi ngay528,
I think there is a great example for you to use that comes with CVI which can be found by clicking Find Examples on the splash screen or Help >> Find Examples in your project. From there, click into Optimizing Applications >> Multithreading. In that folder there is a project that is called BuffNoDataLoss that shows how to create a thread safe queue and setup a producer/consumer type program. In this example the data is a random sine wave but could be adapted to your RS232 data. If you have any questions concerning this example please let me know but this should be a great starting point.
Patrick H | National Instruments | Software Engineer -
Hello,
I am trying to read data into dasylab via Rs232, but I am new to dasylab and havent worked reading in rs232 data before.
I managed to get dasylab to communicate with my device, but I am having trouble parsing the data effectively.
In the rs 232 monitor, without sending any commands, I get a set of data in the format
DA 0 00 20.8 21.5 0.0 0.0<CR><LF>
I've been searching the forums and think this has a very simple solution, I'm just having trouble finding the correct command to put in the "measurement data format" box for each channel
Thanks for the help.Ok, there are a couple of ways to do this
DA 0 00 20.8 21.5 0.0 0.0<CR><LF>
If the first three groups are constant, then use them as a search string to anchor the first data point.
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Channel 1 will be
a\x20
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