Cant' clear eQEP Flags

Arthur Melentovich

Intellectual 475 points

Hello.

I'm working with eQEP on the F28M35H52C1 (M3+C28), and just found that C28 doesn't clear flags of eQEP unit.

I use CCS 5.5.

Two examples bellow on the pictures:

over 12 years ago

0 Arthur Melentovich over 12 years ago

Intellectual 475 points

I launched example eqep_pos_speed_c28 and got same result: flags weren't clearing.

0 Brett Larimore over 12 years ago in reply to Arthur Melentovich

TI__Guru 57255 points

Hi Arthur,

I haven't looked into your issue too deeply at this point, but it appears that the way you are debugging isn't ideal. Can you try the above when the QEP module is not free running. (QEPCTL= 0b00xx xxxx xxxx xxxx)

This should allow you to better check if you are actually able to clear flags (it is possible that new flags are being generated immediately after the clear).

Hopefully this helps.

Thank you,
Brett

0 Arthur Melentovich over 12 years ago in reply to Brett Larimore

Intellectual 475 points

Thank you very much, I'll certainly try it. But QPFLG must be set after 10 ms (frequency 100Hz).

0 Arthur Melentovich over 12 years ago in reply to Brett Larimore

Intellectual 475 points

Yes, they were cleared! I made as you said : set FREE_SOFT bits of the QEPCTL register to 0 , and launch by set 1 to SWI bit in the QEPCTL register. And after few time, flags was set. After clearing all good.

So, is it mean that all working ?

Regards.

C2000™︎ microcontrollers

C2000 microcontrollers forum

Cant' clear eQEP Flags