stuffing SigmaDsp readouts into one integer

drugoimir Question

Mar 15, 2015 00:00

Hello everybody,

i have to transfer some readings out of the dsp, but would like to limit bus traffic, so i was thinking

i could stuff more readings into just one integer (i don't need the resolution given by a standard

dsp register, 8 - 10 bits / reading will be enough).

In C this would be trivial as:

readout32b =(reading1_8b<<24) | (reading2_8b<<16) | (reading3_8b<<8) | (reading4_8b)

but i have no idea how to do that in sigmastudio-ish language.

Other question: i'm struggling with a bug on sigmastudio 3.11.1 (that bug which makes the

mouse cursor to disappear when loading blocks). I see that the bug was corrected in sigmastudio 3.11.2 beta,

but ADI changed their website and i'm not able in finding it. Where is it now?

Thanks.

Tom

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jon71 Reply

Mar 16, 2015 00:00

Bit shifting in SigmaStudio involves multiplying by a (small) 28.0 number, which will truncate, then multiplying by a 5.23 number to shift the truncated bits back to where they were--you will probably need a few operations there as you have to multiply by less than 16 (5.23). Then you add two numbers (one truncated, another truncated and re-shifted) together to multiplex them to an output.

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drugoimir Reply

Mar 16, 2015 00:00

Thanks for your answer, i'll try this.

I always hope in ADI unleashing their assembler or native programming language for sigmadsp, allowing users to write their own blocks / algorithms.

Thanks again.

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EZAdministrator Reply

Aug 2, 2018 00:00

This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

Thank you,
EZ Admin

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