问题
I have Android Things OS image installed for my Rasp3 and successfully booted up and log in to shell using adb, but lcd display is upside down with my 7 inch touchscreen display.
I wonder if there is config like lcd_rotate=2 in /boot/config.txt on Raspbian?
回答1:
You can try to manually mount the boot partition from the sdcard and edit config.txt
mount -t msdos /dev/sdX1 /mnt/disk
echo 'lcd_rotate=2' >> /mnt/disk/config.txt
Where /dev/sdX1 points to your sdcard reader device.
Note: This is more a hack than an officially supported solution, you will have to re-do that operation everytime you upgrade the OS image. It'd be nice to file a feature request to ask for better support for (dynamic?) display configuration
回答2:
I encountered the same problem, but failed mounting the boot partition mentioned in other answers on my Mac OS. However, I found the solution and pretty handy finally.
My Solution： You can simply use Windows OS to mount the TF card with Android Things installed, because the Android Things disk image has a partition with FAT16 format named RPIBOOT containing the CONFIG.txt file which you can append 'lcd_rotate=2' in to resolve the upside down issue on the Raspberry Pi official 7 inch touchscreen.
Bonus： You can adjust the display resolution in the CONFIG.txt as well, and somehow you would better do it. Otherwise, you will find the 800*480 initial resolution makes things much bigger than you expect if you want to develop some UI in you application, because the touchscreen actually is 7 inches with 240 DPI. The best resolution I got by testing is 1200*720. You can append 2 lines in the CONFIG.txt to make the display look nicer:
framebuffer_width=1200
framebuffer_height=720
来源：https://stackoverflow.com/questions/41165198/android-things-with-rasp3-7-inch-touchscreen