How to use uart1 on nRF9160 with NS build?

[Michael Zeng]

In order to be able to use uart1 as a hardware UART to talk to another microcontroller, we defined pins for uart1 in an overlay file (and created a new build configuration so that the overlay file would be applied), and added this to our proj.conf (as explained on this page):

CONFIG_BUILD_WITH_TFM=y
CONFIG_TFM_LOG_LEVEL_SILENCE=y

However, in our code, this line still causes an error:

const struct device *uart_dev = DEVICE_DT_GET(DT_NODELABEL(uart1));

Do you know why? What do we need to do to be able to use uart1?

[Charlie]

Hi Michael,

Could you try to set the following configuration in prj.conf?

CONFIG_TFM_SECURE_UART=n
CONFIG_TFM_SECURE_UART1=n

Best regards,

Charlie