nrf52832 combining SPI and UART printf problem

RE: nrf52832 combining SPI and UART printf problem

jreid27044 — Mon, 20 Feb 2017 18:26:43 GMT

I did add that to the sdk_config.h (using 13.x alpha). We were able to get UART and SPI working at the same time but there definitely is something strange going on with the logging and the UART. Things we do to get it working are:

remove NRF_LOG_INFO steps from the code
It never works the first time we run the code, but when you unplug and plug the dev kit and open and close the COM window (I use Putty), there is a combination that allows it to start working.

As you can tell I havent fully debugged but hopefully that helps someone else with the same issues. Thanks for the debug help!

RE: nrf52832 combining SPI and UART printf problem

Jørgen Holmefjord — Fri, 17 Feb 2017 15:31:25 GMT

Which SDK version are you using? Have you enabled retarget in sdk_config.h (if using SDK 12.x)?

#ifndef RETARGET_ENABLED
#define RETARGET_ENABLED 1
#endif

RE: nrf52832 combining SPI and UART printf problem

jreid27044 — Fri, 17 Feb 2017 15:24:46 GMT

Thanks for the response! When I drill in with the debugger, aa_uart_put() seems to function. Calls the fifo functions properly. Im not seeing any errors. It seems to get to the end of the code to put into the fifo and then doesnt return to the top level to continue executing the code in main(). This is similar behavior to printf(). My latest theory is that the SPI code is using the log functionality which is competing with the UART retarget code.

RE: nrf52832 combining SPI and UART printf problem

Jørgen Holmefjord — Fri, 17 Feb 2017 13:05:22 GMT

Are you able to use app_uart_put()?