TMS320F28379D: Need to execute ISR from RAM cause the code runs too slowly in FLASH

Hi Lihu,

Please have a look at similar threads on this topic- 

(7) CCS/TMS320F28379D: Running ISRs in Ram and Code in Flash - C2000 microcontrollers forum - C2000︎ microcontrollers - TI E2E support forums

(7) TMS320F28379D: ISR overruns when ran from Flash instead of RAM - C2000 microcontrollers forum - C2000︎ microcontrollers - TI E2E support forums

Thanks

Aswin

Hi Aswin,

The two links you had sent are somewhat convoluted, and do not detail exactly what they are doing to simply execute code in this manner.

From what I gather, it looks like conceptually they are performing the following:

1) ISR code is mapped to a pointer in FLASH

2) memcpy is used to transfer this code from where the ISR is located in FLASH to an area of RAM predefined as a "scratchpad space" that is large enough to contain the ISR code and can be made larger as necessary.

3) Copy the address of the new ISR code in place of the vector already contained in RAM

Could you send me code that does this explicitly so that I don't need to guess?

Thanks,

Lihu

Guessing this is all I need to do?

#pragma CODE_SECTION(ADC_isr_code, ".TI.ramfunc")

As long as it and the other code existing in this space, should be automatically loaded from FLASH space to RAM and the addresses in the vector are already correctly pointing towards the address of the isr code should be automatically updated?