[SOLVED] How to collect continuous data from target through RTTLogger?

MRS_2710 · Jun 25th 2020, 4:02pm

I am trying to collect a bunch of data from my target through RTTLogger. But since my BUFFER_UP_SIZE if 8192, I am able to receive only 8192 bytes. Is there a method to collect N number of data without depending on the BUFFER_UP_SIZE through RTTLogger?
Note: I am sending data using SEGGER_RTT_printf and SEGGER_RTT_WriteString.

SEGGER - Fabian · Jun 26th 2020, 10:31am

Hi,
Thank you for your inquiry.
I am not sure if I understand you correctly.
The data that can be transmitted is not limited to BUFFER_UP_SIZE since all RTT buffers are ring buffers.
All data retrieved by J-Link will be marked as free space again.

The RTT Logger is retrieving all data sent by the target until the user shuts down the connection.
It is therefore also not limited to the BUFFER_UP_SIZE.

It is most likely that if you only receive 8192 bytes of data, your target application did not try to write more data.

Best regards,
Fabian

MRS_2710 · Jun 26th 2020, 4:48pm

Hi Fabian,

Thanks for your reply.

I just found I have "SEGGER_RTT_MODE_DEFAULT" value set to SEGGER_RTT_MODE_NO_BLOCK_SKIP. Hence I was getting 8192 bytes alone. When I changed it to SEGGER_RTT_MODE_BLOCK_IF_FIFO_FULL, I started to receive all the data from target.

SEGGER - Fabian · Jun 29th 2020, 8:37am

Hi,
Good to hear that you are up and running again.

We will consider this thread as closed now.

Best regards,
Fabian

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