[GitHub] [incubator-nuttx] anchao commented on issue #5843: Segger System View support on different platforms setup documentation.

[GitBox <gi...@apache.org>]

anchao commented on issue #5843:
URL: https://github.com/apache/incubator-nuttx/issues/5843#issuecomment-1079361379


   Hi @PetervdPerk-NXP  ,
   
   > Unfortunely there wasn't a how to guide, but I tried to mimick the SIM sysview configuration
   
   Yes, the SIM configuration simply enables the configuration to ensure that the compilation can work normally. 
   
   We will add a back-end based on file to save the system view stream on SIM platform, which is still under development
   
   > Regarding a ASM file optimized for ARMv7 SEGGER_RTT_ASM_ARMv7M.S, my workaround was to remove that from build system and use the fallback C file.
   
   Sorry to confuse you, I just tested the configuration under v8m, you can temporarily remove the optimization of v7m, I will try to fix this issue further 
   
   > Some errors regarding missing up_perf_gettime and up_perf_getfreq function, I circumvented this by enabling CONFIG_TIMER_ARCH which implements these functions, but it seems that the sim config didn't require those.
   
   I have uploaded a new PR, they implemented cycle counter based on DWT, you can try this commit:
   
   https://github.com/apache/incubator-nuttx/pull/5850
   
   In addition, you also need to initialize the CPU clock frequency in the board implement, eg:
   
   https://github.com/apache/incubator-nuttx/pull/5850/commits/b5edd67cc592a226c9b0fe32914ac5763c78eea9#diff-2e2c7b8e12a8db8218fd22d16f664621da802957420e528caf0c44d0307dc819R57
   
   > do you have an idea on which interfaces I need implement/enable to get this fully to work?
   
   I think this should be caused by the cycle counter not working properly, please check whether up_perf_init() or up_perf_gettime() is working properly


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