mbed usb serial port and Labview

Topic last updated 18 Sep 2011, by Samuel Cabrero

labview, Serial, USB | 11 replies

Samuel Cabrero

# 17 Feb 2010

Hello, I'm using windows 7 x64 and Labview 2009 x64 and I'm getting a VISA error reading the serial port. Is anyone successfully using mbed with Labview?

Regards,

Samuel.

Replies

Maciej Rajtar

# 17 Feb 2010

Hi, maybe you have to ask : is anyone successfully using mBed and Windows 7 :)

Regards

macc

Igor Skochinsky

# 17 Feb 2010

Works fine with Putty as the client. How are you setting up Labview?

Samuel Cabrero

# 17 Feb 2010

Yes, putty is working fine. I'm configuring labview the same settings as putty, it opens the port correctly but reading or writting throw errors. I have read in Labview forums that many users have problems with USB to serial adapters, so maybe the problem is not on the mbed side.

Anders Rundgren

# 18 Feb 2010

Hi, I have no experience with Labview but I'm sure that they are depending on flow-control on the serial line. MBED unfortunately doesn't support any flow-control so the solution may be lowering the speed until it begins to work reliable.

Anders

Mark B

# 18 Feb 2010

Hi, Which VISA error are you getting? Could you post a screenshot of your code? LabVIEW will have no problem talking to the mbed, so what are your port settings?

Andrew Harpin

# 18 Feb 2010

Maciej Rajtar wrote:

Hi, maybe you have to ask : is anyone successfully using mBed and Windows 7 :)

Regards

macc

Jakub Czaplicki

# 28 Feb 2010

Samuel Cabrero wrote:

Hello, I'm using windows 7 x64 and Labview 2009 x64 and I'm getting a VISA error reading the serial port. Is anyone successfully using mbed with Labview?

Regards,

Samuel.

Hi Samuel, did you sort your LabVIEW problem ?

Samuel Cabrero

# 01 Mar 2010 . Edited: 01 Mar 2010

No, I don't unfortunately. I have written a small program using Qt, qextserialport to read the serial port and qwt library for the charts.

Jakub Czaplicki

# 05 Mar 2010

What was the error msg ? Was it "VISA: (Hex 0xBFFF003E) Could not perform operation because of I/O error." ?

Jakub Czaplicki

# 05 Mar 2010

A short guide on how to use LabVIEW with mbed:

1. Install Windows USB Serial Port Installer (mbedWinSerial_16466.exe) http://mbed.org/handbook/SerialPC ?

2. Once you did this, download, compile and upload to your mbed the second example http://mbed.org/handbook/SerialPC (the one that uses the 'u' and 'd' keys to make LED1 brighter or dimmer). Restart mbed.

3. Run LabVIEW

Open Help -> Search Examples -> Search for "serial" -> choose "Advanced Serial Write and Read.vi"

We need to slightly modify this vi.
in the block diagram change the following:
+ value of "I/O Receive Buffer mask" from 16 to 48 (which corresponds to I/O Receive and Transmit Buffer).
+ in the while loop change the value of "Wait until next ms" from 5 to 1000.

on the front panel
+ choose the correct COM port (VISA resource name)
+ turn off the "End write with termination character?" button
+ turn off the "Read" button
+ in the "string to write" window write "u" or "d"
+ press the start arrow and observe the led #1 on your mbed.

If things doesn't work, check if your mbed works in TeraTerm console - http://logmett.com/index.php?/download/tera-term-465.html or send me a msg.

Good luck.

Jakub

Lenin Franchescoleth Núñez Pintado

# 18 Sep 2011

where in the block diagram is the while loop for change the value of "Wait until next ms" from 5 to 1000¿?

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