Dear Friend, i'm try to use an application wrote originally for RPI2 and test it on NanoPi2 when i try to set the SPI speed the maximum allowed is 5 Mhz and not 25 Mhz as i need there are some example and more doc about how set the SPI speed on NanoPi2 ? I found this library https://github.com/friendlyarm/matrix/blob/nanopi2/lib/spi.c But i don't know if its already ported on NanoPi2 Best Roberto
We developed a simple utility for check the result : in attachment you can found the source of our test application The program name is : demo/matrix-testspi For the test we used this syntax : cd demo/matrix-testspi ./matrix-testspi -spispd <speed in Hz> This is the video https://youtu.be/55DSuYAu2K8 The spi driver dot set the exact speed that i set in the test application and if you send a set > 5 Mhz continue to set only at 5 Mhz we check with our oscilloscope as you can see in the video. Could be that the problem is in the linux driver ... If you send us more info we can try to patch it ourself and share our work with the rest of the community . best Roberto