Use libuarte together with SoftDevice

Question

Hello, guys. We want to use libuarte - advanced UARTE driver in our current application developed for nRF52840 with SDK 17.0.2. We can successfully run libuarte example located under \examples\peripheral\libuarte . However, the trouble comes when we want to merge this example in an environment that uses SoftDevice and app_timer modules. I noticed that other people faced similar issues as well ( thread ). What would be the best way to merge libuarte into environment that uses SoftDevice and app_timer? I noticed that libuarte example uses the following drivers: Those drivers are for the case when SoftDevice is not present. In the presence of SoftDevice, what should we use? I used as a replacement for nrf_soc.c but I am not sure what should I put for the nrf_nvic.c replacement. Can you help me with this? When I merge libuarte example into my environment that contains SoftDevice and app_timer modules, and use Timer 2 and RTC 2 for NRF_LIBUARTE_ASYNC_DEFINE : NRF_LIBUARTE_ASYNC_DEFINE(libuarte, 0, 2, 2, NRF_LIBUARTE_PERIPHERAL_NOT_USED, 255, 3); nrf_libuarte_async_init() function returns error code 7 which should be NRF_ERROR_INVALID_PARAM according to nrf_error.h file. Do you have any idea what I am doing wrong? In this thread , there is a mention that NRFX_PRS_BOX_4 should be set to disabled. Does that impliy the following content into sdk_config.h file: #ifndef NRFX_PRS_BOX_4_ENABLED #define NRFX_PRS_BOX_4_ENABLED 0 #endif Thanks in advance for your time and efforts. Cheers, Bojan.

bojan · Accepted Answer

Hey, guys! Just wanted to share with you that I was finally able to merge libuarte example into the application that contains SoftDevice and app_timer. Given that fact that SoftDevice requires RTC0 and Timer0 and app_timer library consumes RTC1 , I used RTC2 and Timer2 for libuarte implementation: NRF_LIBUARTE_ASYNC_DEFINE(libuarte, 0, 2, 2, NRF_LIBUARTE_PERIPHERAL_NOT_USED, 255, 3); The numbers 2, 2 in the above line of code mean RTC2 and Timer2 are taken for libuarte . At the same time, you should have enabled those ressources ( RTC2 , Timer2 ) through the sdk_config.h file. Also, I removed everything related to UART from sdk_config.h file and included drivers from libuarte example: Finally, lines should be replaced with: I did not touch NRFX_PRS_BOX_4 from sdk_config.h file even if it was suggested in this thread . Cheers! Bojan.

Use libuarte together with SoftDevice

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