rt-thread/components/trace

##How to use the Segger SystemView trace componment

1. Copy description file

Copy the '.\SystemView_Src_Vxxx\Description\SYSVIEW_RTThread.txt' to folder '%SystemView_Install_Folder%\Description\'.

2. Enable trace componment

Add RT_USING_TRACE define in your bsp's rtconfig.h

// <bool name="RT_USING_TRACE" description="Enable trace" default="true" />
#define RT_USING_TRACE

3. Connect to target board debug interface

Segger SystemView only support Segger J-Link and Segger J-Link OB. If you using the origin development boards from vendor, you can upgrade the on board debugger to J-Link OB.

• For ST ST-Link, here is the ST-Link upgrade utility download page
• For Atmel EDBG, here is the EDBG upgrade utility download page
• For Freescale(NXP) OpenSDA/OpenSDA-V2, here is the OpenSDA upgrade utility download page
• For NXP LPC Link 2, here is the LPC link 2 upgrade utility download page
• NXP LPCXpresso, here is the LPCXpresso upgrade utility download page

4. Intergration (Porting) limitation

• Can only trace thread, scheduler and interrupt.
• Tracing RT-Thread IPC componment is not supported.