https://devzone.nordicsemi.com/f/nordic-q-a/19651/segger-rtt-printf-not-printing-all-the-linesI want to read whole flash memory using for loop and see how long it takes. What i have noticed is that it does not print all the lines. On the other side i ask myself: Does it read all the lines? I read the memory as suggested in this post devzoneen-USTelligent Community 13Mon, 13 Feb 2017 18:13:33 GMThttps://devzone.nordicsemi.com/thread/76468?ContentTypeID=1Mon, 13 Feb 2017 18:13:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:92de351e-7e24-4d47-b199-b86b9c164c9fOle Bauck<p>The buffer size is quite small by default in the SDK examples, only 64 bytes. Check SEGGER_RTT_CONFIG_BUFFER_SIZE_UP in sdk_config.h (BUFFER_SIZE_UP in SEGGER_RTT_Conf.h is set to this).</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/76467?ContentTypeID=1Mon, 13 Feb 2017 14:32:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:81309f9f-6f24-45d3-bd3a-522470063c6bSEGGER - Johannes<p>Hi,</p> <p>It could be possible that you print the data &quot;too fast&quot;. This means you write to the RTT buffer faster than the J-Link reads and empties the buffer. When the buffer is full, the default configuration is to discard new data.</p> <p>There are three approaches to avoid this:</p> <ol> <li>Use an external J-Link (PRO/ULTRA+) which might read the buffer faster</li> <li>Use a larger RTT buffer (increase BUFFER_SIZE_UP in SEGGER_RTT_Conf.h)</li> <li>Use RTT in blocking mode (define SEGGER_RTT_MODE_DEFAULT as SEGGER_RTT_MODE_BLOCK_IF_FIFO_FULL)</li> </ol> <p>Please note that with the third approach your application will be blocked and does not run if no J-Link/Debugger is attached.</p> <p>Regards Johannes</p><div style="clear:both;"></div>