Is RTT supposed to work on dev kits PCA10040 or PCA10028?

[robotjosh]

I've tried everything to get a RTT log message to show up from a dev kit to my computer. The uart log works but no combination of settings will get any RTT message to show up. The docs suggest that setting #define NRF_LOG_BACKEND_SERIAL_USES_RTT 1 should be enough for this to work. It does not output any messages whether its the nrf51 or nrf52. In RTT viewer it says it is connected but if I press a key it says "WARNING: Sent 0 of 1 bytes.". I am using keil to evaluate these chips and this sdk but I cannot get anything to work. Please help me with step by step instructions to get any of the nrf51 or nrf52 sdk examples to output a RTT message using keil.

[Daniel Wang]

What SDK version is this? Also, what examples in the SDK are you testing? You are setting NRF_LOG_BACKEND_SERIAL_USES_RTT 1 in sdk_config.h?

[robotjosh]

Hi Daniel- I am using sdk 12.2.0. Yes, that is the first thing I tried is set NRF_LOG_BACKEND_SERIAL_USES_RTT 1 as the documentation suggests. I am attempting this with the peripheral uart and central uart projects. On both of these I have observed uart logging to work but not rtt.

[Wasky]

Hey, are you using NRF_LOG_INFO() or SEGGER_RTT_printf() ? NRF_LOG_BACKEND_SERIAL_USES_RTT -> this flag means you should using NRF_LOG so also you need add flags: NRF_LOG_ENABLED 1 and NRF_LOG_DEFAULT_LEVEL to 0 - 4 ( 0 off, 1 error, 2 warning, 3 info, 4 debug) according to which NRF_LOG_ you wannt to use.

[schef]

SEGGER_RTT_printf() works for me on nrf52832 -> pca10040

[robotjosh]

Turns out RTT does work, but not out of the box for keil. devzone.nordicsemi.com/.../