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A comment on DIY FPGA-based HDMI ambient lighting. Parent comment

Re:DIY FPGA-based HDMI ambient lighting by distantsounds on Wednesday April 22, 2015 @11:01PM (#9424796)
>Then wrote a driver for the LED strip, which communicates over SPI.

If you have to write a driver, you might want to reconsider your definition of "overkill."

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Re:DIY FPGA-based HDMI ambient lighting by matmann2001 on Wednesday April 22, 2015 @11:22PM (#9424851)
1) At the GPIO level, the RPi actually has kernel-space SPI driver. What I really mean is a driver interface for my program.

2) SPI is a ridiculously simple protocol. I have a background in embedded systems, so it's really not a lot of effort. Particularly compared to the OP, who deconstructed and intercepted the entire HDMI protocol on an FPGA. I'd consider the effort required for that task as quite a bit more.

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Re:DIY FPGA-based HDMI ambient lighting by _pmf_ on Thursday April 23, 2015 @04:54AM (#9425544)
Linux also offers user space SPI via `spidev` (i.e. the "driver" consists of a registration call, and all communication is done via regular `read()`/`write()` calls).

For low performance applications, it works perfectly.

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