.. _segger_sysview:
SEGGER SystemView Sample
########################
Overview
********
This sample application uses the kernel system logger and publishes events
through the SEGGER RTT protocol, making it available to the SEGGER
SystemView application.
Requirements
************
* Board supported by J-Link (`list of supported boards <https://www.segger.com/jlink_supported_devices.html#DeviceList>`_)
* `SEGGER J-Link Software and Documentation pack <https://www.segger.com/downloads/jlink>`_
* The board might require a `special bootloader <https://www.segger.com/opensda.html>`_, also available from SEGGER
* `SEGGER SystemView <https://www.segger.com/systemview.html?p=1731>`_
Building and Running
********************
* Follow the instructions to install J-Link and SystemView software on your
computer
* Open J-Link Commander. On Linux, its executable is named `JLinkExe`:
.. code-block:: console
SEGGER J-Link Commander V6.10m (Compiled Nov 10 2016 18:38:45)
DLL version V6.10m, compiled Nov 10 2016 18:38:36
Connecting to J-Link via USB...O.K.
Firmware: J-Link OpenSDA 2 compiled Feb 28 2017 19:27:22
Hardware version: V1.00
S/N: 621000000
VTref = 3.300V
Type "connect" to establish a target connection, '?' for help
J-Link>
* Issue the "connect" command. If it's the only connected board, `Enter`
can be pressed at the `Device>` prompt.
* Select the target interface. Some devices only support the `SWD` type, so
select it by typing `S` followed by `Enter`.
* At the `Speed>` prompt, select the interface polling frequency. The
default of 4000kHz is sufficient, but a higher frequency can be specified.
* Once the connection has been successful, an output similar to this one
should be produced:
.. code-block:: console
Device "MK64FN1M0XXX12" selected.
Found SWD-DP with ID 0x2BA01477
Found SWD-DP with ID 0x2BA01477
AP-IDR: 0x24770011, Type: AHB-AP
Found Cortex-M4 r0p1, Little endian.
FPUnit: 6 code (BP) slots and 2 literal slots
CoreSight components:
ROMTbl 0 @ E00FF000
ROMTbl 0 [0]: FFF0F000, CID: B105E00D, PID: 000BB00C SCS
ROMTbl 0 [1]: FFF02000, CID: B105E00D, PID: 003BB002 DWT
ROMTbl 0 [2]: FFF03000, CID: B105E00D, PID: 002BB003 FPB
ROMTbl 0 [3]: FFF01000, CID: B105E00D, PID: 003BB001 ITM
ROMTbl 0 [4]: FFF41000, CID: B105900D, PID: 000BB9A1 TPIU
ROMTbl 0 [5]: FFF42000, CID: B105900D, PID: 000BB925 ETM
ROMTbl 0 [6]: FFF43000, CID: B105900D, PID: 003BB907 ETB
ROMTbl 0 [7]: FFF44000, CID: B105900D, PID: 001BB908 CSTF
Cortex-M4 identified.
J-Link>
* Now open SystemView. Select the option *Start Recording* from the
*Target* menu (or press `F5`), choose USB, the target device (in this
case, `MK64FN1M0XXX12`), and confirm that the target interface and speed
matches the ones selected in J-Link Commander. The *RTT Control Block
Detection* can be left on *Auto Detection*.
* Once OK is clicked, information will be pulled from the device as usual:
threads, interrupts, and other information will be populated
automatically.
References
**********
* `Segger SystemView: Realtime Analysis and Visualization for FreeRTOS <https://mcuoneclipse.com/2015/11/16/segger-systemview-realtime-analysis-and-visualization-for-freertos/>`_
* `RTT Protocol <https://www.segger.com/jlink-rtt.html>`_
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