tiziano000

Hi all.
Has anyone managed to get the gpio pins working? I'm trying to use gps as timesource for my pi.
I tried connecting the GPS to UART5 (pins 3 and 5) and using pin 12 as a PPS input.
However, I saw that the serial ports are deactivated by default; how can I activate uart5?
then I tried with a serial-usb converter to test the functioning of the pps pin, but without success despite it being correctly configured from gpioinfo. 
 
gpiochip3 - 32 lines: line 21: unnamed "pps-gpio0" input active-high [used]
any suggestions?

Thanks in advance