Hi, This looks like you are having overflows of the RTT buffer. This happens when the device is sending data faster than the J-Link can retrieve it and the following modes are selected by the MCU application: - SEGGER_RTT_MODE_NO_BLOCK_SKIP - SEGGER_RTT_MODE_NO_BLOCK_TRIM
You can improve this situation by e.g. increase the target interface speed in the configuration dialog. If this does not help, and the application is not time critical, you can also change the mode to: SEGGER_RTT_MODE_BLOCK_IF_FIFO_FULL