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Pure Data on Raspberry Pi 2 with real-time kernel and Cirrus card?

dmlandrum

I'm aiming to create a Korg Wavedrum-like project. The idea is to have a tensioned drum head miked with two piezo contact mics (one at center and one at edge) feeding into the Cirrus card so the signals can be processed by PD into something more interesting. I'm not talking about just using the piezos as triggers: the audio they capture can be part of the final sound.

 

I know people have said the RPi is not a good platform for DSP, but I think for this application it will be good enough. The problem I'm having right now is with how to set up a real-time kernel on the RPi 2, which is what I'd like to use as it has more RAM and processor power. I've tried Google and the search here, but didn't find anything I understood. Is this possible, and does anyone know where some good information can be found on it? It's been a long time since I've used Linux, so I'm really rusty at the moment.

 

Thank you very much for your help.

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  • 0

    Ooh, something just occurred to me...

     

    I want to use the new 7" touchscreen as the main interface and display for this project. However, that requires updates to be applied, something I can't do with the RT image, or it'll break. So now it looks like I'm staring down the barrel of doing this the hard way. I was really hoping to avoid that. It's been way too long!

  • 0 in reply to dmlandrum

    Hello Darren,

     

    I had the same problem with some libraries. Then I discovered that it is true that you should not upgrade the sys due the risk to alter the RT components that are a sort of non-standard and unfortunately are not supported by the RT kernel system. But in the meantime, if you can apt-get install components without upgrading the system it continue working fine. So I suggest first to try to install the new components needed by the touch screen display and reduce to the minimum the apt-get install operations, eventually installing manually the needed components the make a test. It is the worth because if the specific parts does not affect the existing kernel and RT involved libraries it continue working fine.

     

    Let me know it this works for you. If not the last chance is to manually install the packages downloading the debs instead of using the apt-get install command. Something that can also be helpful to see exactly what are the dependencies is the aptitude command - similar to the synaptic but more complete and detailed at low level that you can launch from the terminal.

     

    Enrico

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  • 0 in reply to dmlandrum

    Hello Darren,

     

    I had the same problem with some libraries. Then I discovered that it is true that you should not upgrade the sys due the risk to alter the RT components that are a sort of non-standard and unfortunately are not supported by the RT kernel system. But in the meantime, if you can apt-get install components without upgrading the system it continue working fine. So I suggest first to try to install the new components needed by the touch screen display and reduce to the minimum the apt-get install operations, eventually installing manually the needed components the make a test. It is the worth because if the specific parts does not affect the existing kernel and RT involved libraries it continue working fine.

     

    Let me know it this works for you. If not the last chance is to manually install the packages downloading the debs instead of using the apt-get install command. Something that can also be helpful to see exactly what are the dependencies is the aptitude command - similar to the synaptic but more complete and detailed at low level that you can launch from the terminal.

     

    Enrico

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