TMS320F280049: TIDA-010054 Three trivial questions about software codes

Liu Zijian

Part Number: TMS320F280049
Other Parts Discussed in Thread: TIDA-010054

Hi,

Three new questions regarding the DAB software codes.

First, in <interrupt void ISR2(void)>, what’s the purpose of DAB_HAL_setProfilingGPIO2() and DAB_HAL_resetProfilingGPIO2(), please ?

Second, in src file <dab_main.c>, the action frequencies of background tasks are 10 Hz and 100 Hz respectively, but why the annotations are left as below (1 ms and 5ms)?

Third, I am aware that the interrupt latency costs at least 14 system clocks, and to compensate such costs, the CMPC equals to 500-20 = 480. However, I would like to ask why it is 20 instead of 14? is the number 20 a tested result so that the excution of the first sentence of ISR1 just happens at the periodmax 500? I think the number 20 is kind of "coincidence".

Thanks.

Regards,

Zijian

over 3 years ago

+1 Manish Bhardwaj over 3 years ago

TI__Mastermind 43730 points

1. We use the GPIO profiling to profile the code, how much % execution it is taking

2. the commens in the main.c file look as legacy from previous use of that template , i will request this to be filed for clean up

3. the subtract by 20 is to offset for isrTicker++ and some additional code that is there before reading the ADC, so it is a little bit larger than 14. Though i do not think application will get impacted even if it was 14.