nRF9160 UART Communication to External MCU

[Tazik892]

Hello, 

We are trying to get UART communication between nRF9160 and MSP430. 

MSP430 need to send out a sensor data through UART. 

We are using 1.9.1 SDK, and Visual Studio as IDE.

The code gets caught up on "uart_irq_callback_set", and reboots the device right after that line. 

Overlay file:

/ {
chosen {
zephyr,bt-uart=&uart1;
};
};
&uart1 {
compatible = "nordic,nrf-uarte";
current-speed = <115200>;
status = "okay";
tx-pin = <00>;
rx-pin = <01>;
rts-pin = <0xFFFFFFFF>;
cts-pin = <0xFFFFFFFF>;
};

Configuration:

CONFIG_SERIAL=y
CONFIG_TRUSTED_EXECUTION_NONSECURE=y
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_BSD_LIBRARY_TRACE_ENABLED=n
CONFIG_MAIN_STACK_SIZE=4096

Point b is an entrance into callback. What could be potential reasons/ways to debug?

[Øivind]

Hi,

Try using other pins for the UART, as P0.00 and P0.01 are used for the 32.768 kHz crystal by default. For example, try setting the pins to 28 and 29, which correspond to P0.28 and P0.29.

[Tazik892]

Hello, sorry I copied a wrong thing... We used pins 0.10 and 0.11. I tried 0.28 and 0.29 and it still didnt work.

[Øivind]

Can you try using uart2 instead, with the default pins of P0.23 and P0.24?

Also add this to your overlay file:

&i2c2 {
	status = "disabled";
};

[Tazik892]

Hello, we tried that, and switched pins, but it still gets stacked at the exactly the same spot. 

[Øivind]

Hi, sorry for the late reply

It seems to work fine for me. Take a look at this and see if it helps you spot the issue. Might be the callback function.

1072.uart_test.zip