Which Khadas SBC do you use?
VIM3 Pro
Which system do you use? Android, Ubuntu, OOWOW or others?
Ubuntu
Which version of system do you use? Khadas official images, self built images, or others?
vim3-ubuntu-20.04-gnome-linux-4.9-fenix-1.4-221229
Please describe your issue below:
I followed the doc of SPI to run demo code. But the output seems to be empty, when I open the output file, the content is with ^@^@^@^@.
Post a console log of your issue below: