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SPI DMA / STM32 Neopixel output #1212

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gfwilliams opened this issue Aug 7, 2017 · 1 comment
Open

SPI DMA / STM32 Neopixel output #1212

gfwilliams opened this issue Aug 7, 2017 · 1 comment

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@gfwilliams
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gfwilliams commented Aug 7, 2017 •
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Previously we disabled IRQs during the Neopixel sending, but that could cause lost serial data.

Now, re-enabling them might cause glitches - although less likely now that all data to be sent is in one big, flat buffer.

Need to check this (for 1v94) and potentially move to a DMA-based SPI send if needed.
@gfwilliams
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Best solution would be to use DMA for SPI with an optional callback (to allow async transmission). Larger strips of lights could have the bit patterns generated as needed.

Ideally a jshSPISend with a buffer, as per #695

And then hopefully this could even be exposed as an SPI.writeAsync for http://forum.espruino.com/conversations/257857

@gfwilliams gfwilliams changed the title STM32 Neopixel output SPI DMA / STM32 Neopixel output Jan 24, 2018
@gfwilliams gfwilliams mentioned this issue Jul 6, 2018
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@MaBecker MaBecker mentioned this issue Mar 22, 2020
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