CCS/TMDSCNCD28335: I/O freeze when the "Continuous Refresh" function of CCS[Debug] is unchecked

Corentin,

Thanks for reaching out to us on the E2E.  Can you comment on the memory addresses that you are writing to that are the "inputs" to your code?  I assume this is what you meant, but if please correct this point if you meant a GPIO or physical pin input.

Assuming these are memory locations/variables can you also include how you have cast them in your C source?  I'm not sure why continuous refresh would impact this, but if you have not declared the variables as "volatile" and there is no explicit code to change these the compiler will optimize out any "read" since it doesn't see any local modification.

Best,
Matthew

Matthew,

Thanks for your question.

Until now the code have 2 entries, a switch wired on GPIO63, and an analog input wired on ADCINB7.

I use macros to ask the switch state :

if (isRun_SWITCH)...

#define isRun_SWITCH            (GpioDataRegs.GPBDAT.bit.GPIO63 == 1)

(Actually there are 5 steps of #define between both statement)

I use this code to the ADC input :

float DCDC_Phase;

interrupt void ISR-fun (void)

{

...

    DCDC_Phase = OND3KW_GetMesRes(OND3KW_PIN_REF3)*OND3KW_GAIN_REF3;

//macro definition : OND3KW_GetMesRes(OND3KW_PIN_REF3) --> *(&AdcMirror.ADCRESULT0 )

}

I hope I correctly answer your question.

Corentin,

Thanks for this.  I know that the Gpio structures are defined as volatile, so that should make the compiler force a read.

I assume this is the contention point, i.e. w/o continuous run the code doesn't enter the if statement, even if GPIO63 is high, correct?

Would it be possible to change the macro statement to the following:

if (isRun_SWITCH)... 

to

if (GpioDataRegs.GPBDAT.bit.GPIO63)

This should do the same thing, since we are reading a single bit.  If it is high then you will enter the loop.  I think the current code is the same, just want to simplify a bit.

If the above doesn't work I may ask you to send me the dis-assembly of the current "if" statement. 

Best,

Matthew