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NI Forum Getting error when running with custom firmware on pico with labview
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Related

Getting error when running with custom firmware on pico with labview

cbohra00627
cbohra00627 over 1 year ago

I am trying to create a labview driver for controlling the pi pico led. I went through the Digital Out Control.vi VI in pico_scpi_usbtmc_labtool and tried to replicate it for the led control. I took the blink example from pico-sdk examples directory and added the function to control led (i.e. gpio_put(LED_PIN, 1)) to the SCPI_DigitalOutput() function of gpio_utils.c file in pico_scpi_usbtmc_labtool. I created a new firmware with this change and loaded on pi pico. Now, whenever I do digital write HIGH, the led is turning on.

But when I tried to create a separate driver for led control with a separate SCPI command, I am getting some error while running the VI. The build was successful with my change and I loaded the firmware on the pico, but when I am trying to run my VI (snip attached below), I am getting the below error.

image

Code for led control:

led_utils.c:

image

led_utils.h

image

I have added the led executable and dir path to Cmakelists.txt and also added the INSTRUMENT_LED_OUTP_COMMANDS macro to scpi commands list in scpi-def.c

Am I missing something? Has anyone seen this error before?

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  • Andrew J
    Andrew J over 1 year ago +4
    This is failing in the init code, so it’s not even reaching your code. One of the installed tools with LabVIEW is NI I/O Trace. Run that, turn on tracing, then run the VI again and see if that gives you…
  • cbohra00627
    cbohra00627 over 1 year ago in reply to Jan Cumps +3
    Its working now!
  • Jan Cumps
    Jan Cumps over 1 year ago in reply to Andrew J +2
    The init block indeed checks for the IDN* string I haven't exposed the connectors to the button that can turn ID Check off. You can do this yourself, by clicking on the connector location in the…
Parents
  • cbohra00627
    0 cbohra00627 over 1 year ago

    HI Andrew J Jan Cumps , I checked the string constants inside the init block, the "display \ codes" option is checked. Then I tried turning off the ID query for the init block, this time I didn't face the issue. After running with "Step over subVI", it seems the issue occured after the read operation for ID. In the probe watch window, in the possible reason section, it is written "VISA:  (Hex 0xBFFF0015) Timeout expired before operation completed." One more thing, I am getting this error only on alternate runs and that too only in my custom VI. Other example VI's are working fine.

    image

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  • Jan Cumps
    0 Jan Cumps over 1 year ago in reply to cbohra00627
    cbohra00627 said:
    One more thing, I am getting this error only on alternate runs

    When you first run an existing example,

    does your flow then:

    • fail at your first run after that or
    • fail during the second run?
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  • Jan Cumps
    0 Jan Cumps over 1 year ago in reply to cbohra00627
    cbohra00627 said:
    One more thing, I am getting this error only on alternate runs

    When you first run an existing example,

    does your flow then:

    • fail at your first run after that or
    • fail during the second run?
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  • cbohra00627
    0 cbohra00627 over 1 year ago in reply to Jan Cumps

    The existing examples are running fine but when I try to run my own VI, I am getting this error.  The first run goes fine but the second run gives error. And this cycle continues.

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