case about How many bytes can output at a time in RTT

RE: case about How many bytes can output at a time in RTT

Håkon Alseth — Mon, 25 Oct 2021 12:08:23 GMT

Hi,

Which settings did you enable?

If you are using a dedicated logger thread, you have to adjust the sizes there (see CONFIG_LOG_BUFFER_SIZE , CONFIG_LOG_BACKEND_RTT_OUTPUT_BUFFER_SIZE).

Did you set CONFIG_LOG_MINIMAL? If so, the SEGGER_RTT buffers need to be adjusted (ie. CONFIG_SEGGER_RTT_BUFFER_SIZE_UP and CONFIG_SEGGER_RTT_MAX_NUM_UP_BUFFERS) and you should look into setting CONFIG_SEGGER_RTT_MODE_BLOCK_IF_FIFO_FULL, as previously mentioned.

Kind regards,

Håkon

RE: case about How many bytes can output at a time in RTT

yuanyongsong — Mon, 25 Oct 2021 07:17:20 GMT

Hi Håkon,Thank you very much for your reply

I modified them separately according to your suggestions, but it didn’t seem to work

I did a more detailed test and found that only the first packet of data when the 9160 is turned on will be like this，all subsequent data are complete.

And I use the serial port to output log data, and there is no such problem at all.

It feels like a problem with RTT.

Kind regards,

yuanyongsong

RE: case about How many bytes can output at a time in RTT

Håkon Alseth — Fri, 22 Oct 2021 11:46:02 GMT

Hi,

[quote user=""]I use RTT to output log data, but I found that it can only output about 1k characters each time. Where can I modify it?[/quote]

Try setting "CONFIG_LOG_MINIMAL=y" (CONFIG_LOG_MODE_MINIMAL in ncs v1.7.0 and newer), which disables the logging thread.

You can also try to adjust "CONFIG_SEGGER_RTT_MAX_NUM_UP_BUFFERS".

If you do not want it to drop packets when the buffer is filled up, you can add this configuration:

CONFIG_SEGGER_RTT_MODE_BLOCK_IF_FIFO_FULL=y

Note that this will block if the FIFO is filled up, meaning that you need to open the RTT viewer to allow the program to run.

Kind regards,

Håkon