Segger RTT drivers

Note

Segger drivers works only with J-Link debug probes. Sometimes it’s possible to replace vendor-specific debug interface with J-Link OB firmware. For details look at Segger website

Supported Segger drivers:

• Serial over RTT - CONFIG_SERIAL_RTTx,

• Console over RTT - CONFIG_SERIAL_RTT_CONSOLE_CHANNEL

• Segger SystemView - CONFIG_SEGGER_SYSVIEW

• Note RTT - CONFIG_NOTE_RTT

Segger SystemView

1. Steps to enable SystemView support:

2. Make sure your architecture supports a high-performance counter. In most cases it will be:

   CONFIG_ARCH_PERF_EVENTS=y

   In that case, the the architecture logic must initialize the perf counter with up_perf_init().

3. Enable instrumentation support:

   CONFIG_SCHED_INSTRUMENTATION=y

4. Configure instrumentation support. Available options for SystemView are:

   CONFIG_SCHED_INSTRUMENTATION_SWITCH=y

   CONFIG_SCHED_INSTRUMENTATION_SYSCALL=y

   CONFIG_SCHED_INSTRUMENTATION_IRQHANDLER=y

5. Make sure that CONFIG_TASK_NAME_SIZE > 0, otherwise task/thread names will not be displayed correctly

6. Enable Note Driver support and disable Note RAM driver:

   CONFIG_DRIVERS_NOTE=y

   CONFIG_DRIVERS_NOTERAM=n

7. Enable Note RTT and Segger SystemView support:

   CONFIG_NOTE_RTT=y

   CONFIG_SEGGER_SYSVIEW=y

8. Configure RTT channel and RTT buffer size for SystemView:

   CONFIG_SEGGER_SYSVIEW_RTT_CHANNEL=0

   CONFIG_SEGGER_SYSVIEW_RTT_BUFFER_SIZE=1024

   In case SystemView returns buffer overflow errors, you should increase CONFIG_NOTE_RTT_BUFFER_SIZE_UP.

2. Use SystemView for heap tracing:

Refer to example configuration at stm32f429i-disco/configs/systemview. Make sure that CONFIG_SCHED_INSTRUMENTATION_HEAP is enabled.

Example of screenshot from SystemView: