Hello, I have a couple of questions about the UART interface and GPIO usage for the i.Pi SMARC RB5 board with Ubuntu 20.
1) In the board wiki page (url: https://www.ipi.wiki/pages/rb5-docs?page=UserInterfaces.html) I found the expansion header pinout with the GPIO enumeration. However, there is no reference or example to how do I control those GPIOs. To use them should I export them with /sys/class/gpio/export? What are the names within ubuntu of the GPIOs? If you could provide me an example to set and reset a GPIO it would be great.
2) In the same expansion header, there are the pins UART TXD and UART RXD for an UART interface. What device file should I use to interact with this interface in Ubuntu 20?
Thank you