Task is not running in flash based code

Shakeel,

What device are you using?

Hi

I am using  F28335, actually i found some thing about the problem , i am running the motor control code from ti, multi axes dual motor control kit , i have modified it to run from flash, every thing works ok as long as i am not servicing the pwm interrupt, i mean i go into pwm interrupt service routine, and if a certain flag is true, clark and park and other computations are performed, if that flag is not true i come out of interrupt. as long as that flag is not true i can see that my break point is hit in my task and i can see my code halting in task, that mean it comes in motor control task , i can see that pwm interrupt keeps on coming, it seems to me that if complete isr is executed, next pwm itnerrupt comes in quickly, and task never get time to run as i learnt task priority is lower than hw interrupt. i have to debug further to confirm it.

I want to know if there is some issue for this code to run from flash, though i am running it at 150mhz which mean with flash i can get up to 95mips which is good enough. please help me about this

Regards.

Shakeel

Shakeel,

Did you get any further information in debugging this issue?

hi david

I have found a solution to this, i was flashing my code to flash with ccs 3.3  plugin for flashing , it picks up its own flash wait states as 15,15,31  though in my code i had fixed these  setting to be 5,5,8 . When i changed thse from 15,15,31 to same as in my code (init flash routine according to spru 957i) i got the problem solved. flash acces time was reduced and it speeds up the system. But now i am getting new problem, i cannot see pwm on scope if i do a power on reset to my flash based program. my program runs ok as long as i dont do power on reset.

it get difficult to debug from flash wehre the code is having problem after power on reset, so i toggle a led on control card by putting a while loop at very start of my  motor control task, this version of code runs even  after power on reset, i have posted this question last night on c2000 forum. also a flag that actually allows park clark alogrithem computation  in isr  is not true in this version. to avoid servicing isr for debug purpose. I need some idea how to fix or debug it

Shakeel

I think you should check your task and ISR stacks to make sure that they have not overflowed.   In CCSv3, you can user Kernel/Object View (KOV) to see the task stacks and the system stack (used for ISRs).   Timing is much different with FLASH and RAM and maybe you are taking nested interrupt or some such in the FLASH case that you don't see in the RAM setup.

Hi, Tim !  Where can I find documentation about this task? I am using tms320F28027, and  I want place piece of my code or all code in the RAM.  Can I do thus so after

reset my program copy from FLASH to RAM?

Thanks in advance!

Have a read of:

http://focus.ti.com/mcu/docs/litabsmultiplefilelist.tsp?sectionId=96&tabId=1502&literatureNumber=spra958i&docCategoryId=1&familyId=1414

Tim

Thank you, Tim

This reference isn`t   working.  Please update this!