TDA4VM: Code coverage in tiarmclang

kanna

Part Number: TDA4VM

Tool/software:

Hi TI,

We are developing the IPC firmware for the MCU R5F core, using the 09_02_00 release version.

We followed the procedure outlined in this link: https://software-dl.ti.com/codegen/docs/tiarmclang/rel2_1_0_LTS/compiler_manual/code_coverage/source_based_code_coverage.html

We added the coverage flag in the following file location:

Location: ti-processor-sdk-rtos-j721e-evm-09_02_00_05/pdk_jacinto_09_02_00_30/packages/ti/build/makerules/rules_ti_cgt_arm.mk
Change: makefile

rules_ti_cgt_arm.mk:51:
CC = $(TOOLCHAIN_PATH_$(CGT_ISA_PATH_PRFX))/bin/tiarmclang -fprofile-instr-generate -fcoverage-mapping

After building with that flag, we noticed an increase in file size, confirming that the flag is working.

The firmware is functioning correctly on the TDA4VM kit, but we are unsure where the code coverage data is stored, as FreeRTOS does not have a filesystem.

Where can we retrieve the code coverage data in the RTOS firmware?

over 1 year ago

0 Ki over 1 year ago

TI__Guru**** 480331 points

Hello,

I have brought this thread to the attention of the compiler experts. Please note that due to the long holiday weekend a response will not come until at least Tuesday of next week.

Thanks

0 George Mock over 1 year ago

TI__Guru**** 253190 points

kanna said:
we are unsure where the code coverage data is stored, as FreeRTOS does not have a filesystem

Then you have a use a feature of CCS called the scripting console. You run a script there which copies the code coverage counters from device memory into a file on the host system. Please view the video titled Code Coverage Dump Counters from the tiarmclang video series.

Thanks and regards,

-George

0 kanna over 1 year ago in reply to George Mock

Intellectual 345 points

Hi,

Can we use the "12.1.5.2. Retrieving Counters Using Compiler Runtime Support"?

Link - https://software-dl.ti.com/codegen/docs/tiarmclang/rel2_1_0_LTS/compiler_manual/code_coverage/source_based_code_coverage.html#retrieving-counters-using-compiler-runtime-support

How do we use this?

+1 George Mock over 1 year ago in reply to kanna

TI__Guru**** 253190 points

kanna said:
Can we use the "12.1.5.2. Retrieving Counters Using Compiler Runtime Support"?

Probably not. That is because in an earlier post you said ...

kanna said:
FreeRTOS does not have a filesystem

The code that retrieves the counters relies on the C I/O functions fopen and fwrite. To understand the conditions under which those functions are supported, please see The C I/O Functions part of the tiarmclang online documentation. You'll see it only works when running under a debugger such as CCS. It also relies on a hidden breakpoint. I don't know, but I suspect that breakpoint will cause problems for FreeRTOS.

The alternative is the method shown in the video I suggested in my previous post.

Thanks and regards,

-George

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TDA4VM: Code coverage in tiarmclang