nrf9160DK : UART Communication between nrf9160 and nrf52840

[ErDarshan]

Goal: Using NRF9160DK board, communicate nrf9160 and nrf52840 over UART

I tried to use UARTE on both sides. Below is project configuration and overlay file for both boards.

NRF9160:

CONFIG_SERIAL=y
CONFIG_UART_INTERRUPT_DRIVEN=y

&uart2 {
	compatible = "nordic,nrf-uarte";
	current-speed = <115200>;
	status = "okay";
	tx-pin = <18>;
	rx-pin = <17>;
	rts-pin = <21>;
	cts-pin = <19>;
};

NRF52840:

CONFIG_SERIAL=y
CONFIG_UART_INTERRUPT_DRIVEN=y

&uart1 {
	compatible = "nordic,nrf-uarte";
	current-speed = <115200>;
	status = "okay";
	tx-pin = <17>;
	rx-pin = <20>;
	rts-pin = <15>;
	cts-pin = <22>;
};

Please find attached the code for both devices,

nrf52840_uart.zipnrf9160_uart.zip

Please note I have already gone through lte_ble_gw and hci_lpuart examples. They are using H4 and I would like to use raw UART between two controllers over MCU_IF.

[Øyvind]

Hello, 

Please be aware of tampering with the nRF9160DK Board Controller (nRF52840) will result in loss of function. Please see Board Controller Firmware under Working with nRF9160 DK. Also, please see the nRF9160 DK User Guide regarding virtual COM port pin routing on the nRF9160DK

Have you looked at the Low Power UART sample using the Low Power UART driver, or the Connectivity Bridge application? There is also an outdated sample found here which should show the basic functionality. Please see the Zephyr project UART API as well. 

Kind regards,
Øyvind