NRF52840 Hangs after certain bytes of NRF_LOG_INFO (SDK - 17.1.0)

[Yogeshwaran]

Hi, I am using MCP2515 lib from https://github.com/DejanBukovec/NRF5-SDK-MCP2515 

So far example is working when i connect Jlink RTT viewer throughout the testing.

When I disconnect RTT Viewer then NRF_LOG_INFO("BUF0") present in infinite for(;;) is not printing and device hangs over there, but if RTT viewer is connected then no issues and it works seamlessly.

Any suggestions?

Check the sdk_config.h for reference.

[dgerman]

Are you using deferred log processing ?

Have you seen components/libraries/log/nrf_log_ctrl.h

/** @brief Macro for processing all log entries from the buffer.
 * It blocks until all buffered entries are processed by the backend.
 *
 * @note If logs are not deferred, this call has no use and is empty.
 */
#define NRF_LOG_FLUSH()      NRF_LOG_INTERNAL_FLUSH()

 

[Yogeshwaran]

Sorry I have edited the post and it was not FLUSH api causing issue. Actually NRF_LOG_INFO is causing the issue

[Einar Thorsrud]

Hi,

In your sdk_config.h you have set SEGGER_RTT_CONFIG_DEFAULT_MODE to 2, which is BLOCK_IF_FIFO_FULL. So what you are seeing is the expected behavior with your current configuration. I suggest you set it to 0 (SKIP), which is the default in the SDK examples.

[Yogeshwaran]

oh okay let me try and confrim.

[Yogeshwaran]

Thanks Thorsrud, I have changed value from 2 to 0 of SEGGER_RTT_CONFIG_DEFAULT_MODE and now things are perfect.