iio_readdev buffer refill timeout error

dv3@2 on Jan 13, 2022

Hello,

I'm having some issues reading the device after it is available. I'm just trying to verify that data is getting into memory for the device using the iio_readdev in the console.

After I manually turn device on using echo 1 > into scan_elements in_voltage_en, echo 1 > buffer/enable etc.

The device shows data_available but I'm unable to read this data from the buffer. Maybe I'm doing something wrong as I'm new to using IIO.

Thanks

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dv3@2 Jan 21, 2022 in reply to dv3@2 +1 suggested

I was able to get this working. I must've had something wrong in my hdl code. I made some changes and rebuilt everything and now I'm getting data.

0 travisfcollins

on Jan 13, 2022 11:47 PM
iio_readdev will handle the buffer enables and such. I would just reboot and use iio_readdev and/or IIO-Scope alone. If it's still timing out you likely are not providing data correctly upstream. Are you using our HDL?

-Travis
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0 dv3@2 on Jan 14, 2022 1:32 AM in reply to travisfcollins

I'm using a slightly modified version of your HDL. I ported it to work with the ultrazed-eg IO dev board.
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0 travisfcollins

on Jan 14, 2022 10:04 PM in reply to dv3@2
My guess would be that there is something missing in how the DMAs are connected. Can you verify their connections and then check if interrupts are triggered when running iio_readdev or IIO-Scope?

-Travis
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0 dv3@2 on Jan 20, 2022 4:23 PM in reply to travisfcollins

All the connections look good, and when I call the iio_readdev then check the interrupts I see that it is triggering interrupts on the rx-dmac. It looks like there are 2 interrupts triggered for each call of the function.
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0 dv3@2 on Jan 21, 2022 3:21 PM in reply to dv3@2

I was able to get this working. I must've had something wrong in my hdl code. I made some changes and rebuilt everything and now I'm getting data.
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