I had the same problem some moths ago. Some help to get into it:
1.) check how uarts work in ZephyrOS(poll/interrupt driven)
2.) maybe you need to setup the uart port, with different pins etc. Then you have to change the device tree. You can start with you test board and follow the includes till you reach the definition of the uart and its pins.
3.) Bluetooth stuff
Keep in mind when you are on the master branch that the API is changing from time to time. p.e. 2 days ago the uart_poll_out function changed and broke my demo project. :D
On 29/11/2018 23:50, Gustavo FN wrote: