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Slow SPI - anyone else seeing this?
Posted: Fri Oct 06, 2017 9:09 pm
by bitbank
I've been testing the NanoPi Duo with the included Ubuntu build. For some reason, the SPI can only achieve about 3Mhz (based on my observed ili9341 LCD refresh rate). Other H2+ boards can normally go as high as 33Mhz (~30FPS update). Anyone else seeing this issue?
Re: Slow SPI - anyone else seeing this?
Posted: Sat Oct 07, 2017 10:21 am
by meisam
Yes , I have the same issue witj ILI9341 , I use the native driver (spidev) with C & gcc.
lcd refresh time is high.
Re: Slow SPI - anyone else seeing this?
Posted: Mon Oct 09, 2017 5:21 pm
by bitbank
I tried booting the NanoPi Duo with a mainline (4.11) Linux build for Orange Pi Zero (same CPU). The SPI speed is fine, so it's purely a software problem on the part of FriendlyElec's Linux build.
Re: Slow SPI - anyone else seeing this?
Posted: Tue Oct 17, 2017 11:14 pm
by rirbe
Thanks for posting this information
Re: Slow SPI - anyone else seeing this?
Posted: Wed Oct 18, 2017 2:42 am
by bitbank
Here's a video of my game emulator running with my SPI code on the Duo and ili9341. This is a recent Armbian build for the Orange Pi Zero instead of the awful build shipped by FriendlyElec.
https://www.youtube.com/watch?v=jYbecorQj1E
Re: Slow SPI - anyone else seeing this?
Posted: Fri Oct 20, 2017 10:47 am
by annawarren
Great, thanks
