It doesn't need to be high performance, I just need to draw a bit mask.
I'll be driving it from a micro controller, arduino or perhaps a BeagleBone Black.
The application is to produce structured light patterns with a off-the-shelf projector.
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\$\begingroup\$ Do you mean DVI-D or DVI-A signals (the latter are just plain VGA)? \$\endgroup\$– Dmitry GrigoryevCommented Sep 2, 2019 at 8:11
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3 Answers
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The Raspberry Pi 4 has two HDMI ports. Use one for your UI and the other for your structured light generation.
https://www.raspberrypi.org/products/raspberry-pi-4-model-b/
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I'd go to the Raspberry Pi for the HDMI output instead of the Beaglebone black, and just use an HDMI to DVI converter, like http://www.amazon.com/HDMI-Adapter-Plated-Connector-Female/dp/B000FUVNX8
answered Jul 31, 2014 at 12:37
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\$\begingroup\$ I'm hoping to preserve the 'normal' computer interface stuff for an actual UI for the device. \$\endgroup\$ Commented Aug 1, 2014 at 1:58
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As far as I remember, 1080p requires a 139MHz clock rate [1]. Good luck getting that with an arduino or any bog-standard mcu, not to mention signal integrity issues if you don't design this properly.
A Beaglebone may be up to the task, I have no experience with them, but then you are probably looking more at software piping stuff out through HDMI. This is much the same as using a Raspberry Pi or other PC-related stuff, where the programming probably will be easier than writing mcu-specific firmware to do this.
If you want a challenge, you could try using an FPGA on a devboard, for example the ZedBoard [2]. This is a more expensive way (both in time and money) of doing it, though.
Good luck, whatever you end up doing! :)
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\$\begingroup\$ Yeah, I've been leaning towards the BBB. Its PRUs run at 200mhz and offer strict 5ns timing for each operation. \$\endgroup\$ Commented Aug 1, 2014 at 1:56
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\$\begingroup\$ I also found this: ti.com/lit/ds/symlink/tfp410.pdf Which looks like it will deal with a lot of the DVI details. \$\endgroup\$ Commented Aug 1, 2014 at 1:57
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\$\begingroup\$ I'm not sure you can bitbang the BBBs outputs at 139/165MHz though, especially if you need to do some processing... Why not just use the HDMI out from it and use a passive HDMI->DVI-converter for like $5? \$\endgroup\$– ArahoCommented Aug 1, 2014 at 6:12
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\$\begingroup\$ Because I want to use the normal display for UI. The PRUs can probably do it... The processing will all be done in user-space on the main CPU and written to shared memory. The PRU would just need to copy bits from memory out to the DVI. \$\endgroup\$ Commented Aug 2, 2014 at 1:38
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2\$\begingroup\$ It's worse than that, actually. 1080p60 has a pixel clock of 139 MHz, which means a TMDS clock of 1390 MHz. You aren't bit-banging this from anything. \$\endgroup\$– user39382Commented Sep 1, 2019 at 20:15