Please help me modify this serial routine to resolve the problem of unstable data sending and receiving.

[peter.min]

Use this routine to send and receive data from 4 different serials, receive and send data loss, please help me modify this sample bug.

sdk ncs v1.3
Path:D:\ncs\v1.3.0\nrf\samples\nrf9160\spm\prj.conf
Filename:prj.conf
Modify:CONFIG_SERIAL=n

Path:D:\ncs\v1.3.0\zephyr\boards\arm\nrf9160dk_nrf9160\nrf9160dk_nrf9160_common.dts
Filename:nrf9160dk_nrf9160_common.dts
Modify:Replace this dts file with the provided sample dtc file.    nrf9160dk_nrf9160_common.dts

Path:D:\ncs\v1.3.0\nrf\applications\21_uart_x4
Storage example:21_uart_x4

0160.4uart_example.rar

[peter.min]

Hi Håkon Hardy Lier,

This issue has been resolved.
By adding fifo to tx and rx to separate TX from RX,
nrf9160 serial port use is very different from the nrf52 series,
It's also very different from other slings.

Thank you for all your assistance.
Kind regards,
Peter.Min