ValueError: Error initialising UART

[Jianfengusa]

Having trouble initialising UART on Ubuntu 16.04. Traceback (most recent call last): File "gps.py", line 10, in u = mraa.Uart(gps_port) File "/usr/lib/python3.5/dist-packages/mraa.py", line 1073, in init this = _mraa.new_Uart(*args) ValueError: Error initialising UART

my systemlog is Mar 21 15:12:01 irrigationgps-16 libmraa[10208]: libmraa version v2.0.0 initialised by user 'irrigation-gps-16' with EUID 1000 Mar 21 15:12:01 irrigationgps-16 libmraa[10208]: Adding i2c bus found on i2c-5 on adapter i2c_designware.1 Mar 21 15:12:01 irrigationgps-16 libmraa[10208]: Adding i2c bus found on i2c-4 on adapter i2c_designware.0 Mar 21 15:12:01 irrigationgps-16 libmraa[10208]: up2: kernel pinctrl driver unavailable Mar 21 15:12:01 irrigationgps-16 libmraa[10208]: up2: Platform failed to initialise Mar 21 15:12:01 irrigationgps-16 libmraa[10208]: imraa: Failed to open lock file Mar 21 15:12:01 irrigationgps-16 libmraa[10208]: gpio: platform doesn't support chardev, falling back to sysfs Mar 21 15:12:01 irrigationgps-16 libmraa[10208]: libmraa initialised for platform 'Unknown platform' of type 98 Mar 21 15:12:01 irrigationgps-16 libmraa[10208]: uart: open(/dev/ttyS5) failed: Permission denied Mar 21 15:12:12 irrigationgps-16 org.gnome.zeitgeist.SimpleIndexer[964]: ** (zeitgeist-fts:1721): WARNING **: Unable to get info on application://nautilus-autostart.desktop

[Propanu]

Hi @Jianfengusa, it looks like a permission issue. You need to either run your application as the super user (with sudo) or enable I/O access for the regular user by following these instructions from Aaeon for the UP2 board. Thanks!