Add sigma_delta module. #1000
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Add sigma_delta module. #1000
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This looks cool! One question: should the pin number checks be turned into a MOD_CHECK(sigmadelta) and abstracted in the platform layer? Just thinking ahead to hopeful ESP32 support... |
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Thanks for the hint - these literals weren't a portable solution. |
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It appears that this PR collides with #1023 by now. I'm postponing this one and rebase once the other got merged. |
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I'll do the extra commit to sweep up all the feedback on #1023 tomorrow and then we should be good to go. |
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Rebased onto |
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This PR adds Lua commands to control the "sigma-delta" signal generator described in A first order sigma-delta signal from io pin source.
Documentation is a bit sparse and I had to derive most details with waveform scoping, though I hope that the API doc provides enough information of what to expect:
A hardware-driven pulse generator with 12.5 ns to 3.2 µs high (or low) duration and total period of 2x to 256x. It can be also operated as 8 bit PWM with fixed 312 kHz frequency. Any GPIO except pin 0 / GPIO16 is selectable as output.