NRF_LOG_INFO duplicate output in Debug Terminal

RE: NRF_LOG_INFO duplicate output in Debug Terminal

Marjeris Romero — Thu, 22 Nov 2018 10:13:41 GMT

Hi Jim,

Maybe the RTT buffer is full? Can you try to implement the solution in this case and see if that helps with the missing outputs?

As explained by Sigurd, try to change the SEGGER_RTT_CONFIG_DEFAULT_MODE and to increase the SEGGER_RTT_CONFIG_BUFFER_SIZE_UP to 1024 in sdk_config.h

If this does not work maybe you will need to sent me your i2c files so I can try to reproduce the issue...

Best Regards,

Marjeris

RE: NRF_LOG_INFO duplicate output in Debug Terminal

jtell466 — Wed, 21 Nov 2018 19:50:35 GMT

I had a couple of lower-level logging calls in my I2C code (called by bno055_read_chip_id). Removing them changed the behavior of the top-level logging in main: no more duplicate "BBBBBB", but no "CCCCCC" output after that. Removing the call to bno055_read_chip_id (note there are no longer lower-level logging calls anywhere) causes all main.c logging to appear correctly. BUT (this is where it gets more weird!) keeping the call to bno055_read_chip_id and removing the delay call between "BBBBB" and "CCCC" logging calls, results in duplicate "CCCCCC" output!

My suspicion is that there is something going goofy with logging buffering/flushing mechanism, but I don't have deep familiarity with the underlying code there. If it was just a case of duplicate output showing up, I might be able to consider that "benign" and ignore it; but when output goes missing.... well, that's not good. Is there any other info I can provide that might be helpful here?

Thanks very much!

Jim

RE: NRF_LOG_INFO duplicate output in Debug Terminal

Marjeris Romero — Wed, 21 Nov 2018 16:12:51 GMT

Hi Jim,

I don't know what can be causing this behaviour. I took your main and sdk file, made my own declarations for errval, chip_id_u8 and ctr and didn't see any duplicates in the RTT debug viewer of SES. So my thoughts are that the problem must come from the function bno055_read_chip_id. Maybe you can test doing the same as well?

//    u8 chip_id_u8;
//    s8 errval;
 
//   errval = bno055_read_chip_id(&chip_id_u8);

// NOTE: ADDING THE FOLLOWING CALL RESULTS IN no subsequent output!
//    nrf_delay_ms(100);

     int8_t errval=0;
     uint8_t chip_id_u8=0;
     uint8_t ctr=0;
    
   NRF_LOG_INFO("errval = %d, chipid = %d, ctr=%d", errval, chip_id_u8, ctr++);

Have you made any modifications to bno055_read_chip_id function? Are you sure you are not printing any logs inside this function?

Best Regards,

Marjeris

RE: NRF_LOG_INFO duplicate output in Debug Terminal

jtell466 — Tue, 20 Nov 2018 16:11:29 GMT

Hi! Thanks for getting back! I'm still baffled by this one!

I've attached sdk_config.h and my main.c. Putting breakpoints on the logging calls

shows me that they are only getting executed once; but the output disagrees!

I really appreciate any insights you might have!

Jimdevzone.nordicsemi.com/.../1616.sdk_5F00_config.h devzone.nordicsemi.com/.../8713.main.c

RE: NRF_LOG_INFO duplicate output in Debug Terminal

Marjeris Romero — Tue, 20 Nov 2018 12:07:56 GMT

Hi Jim,

Sorry for the late reply, half the office here was busy with Electronica conference last week. I haven't seen this error before, are you sure you are not printing the same log info from two different places in your code? Could you send me the sdk_config.h file so I can take a look at how the logging module is configured?

Best Regards,

Marjeris