TMS320F280049: GLDCTL2[OSHTLD] doubt

Jordan Zhou

Genius 9700 points

Part Number: TMS320F280049

Hi,

There's one configure of HRPWM, to check with you.

PWM5 and PWM6 are:

1) High resolution, CMPA, CMPB, TBPRD

2) Shadowed

3) PWM6 is linked to PWM5, CMPA, CMPB, TBPRD and GLDCTL2.

4) Global load

In PWM5, there's the configure GLDCTL2[OSHTLD]=1. What about PWM6? Do we need to set GLDCTL2[OSHTLD]=1?

During customer's test, we found that, when the LLC load was heavy, PWM6A output is not correct, there were no pulses output from the pin, for more than 1ms. If we don't use global load, there's no issue. The duty is between 3 and TBPRD-3. Up-down mode is used.

What could be the issue?

Thanks a lot.

Br, Jordan

over 5 years ago

0 Nima Eskandari over 5 years ago

TI__Guru 52010 points

Jordan,

If the ePWM6 GLDCTL2 is linked to ePWM5 GLDCTL2, then no you do not need to set the ePWM6Regs.GLDCTL2.OSHTLD to anything because it is using the linked one!

Nima

0 Jordan Zhou over 5 years ago in reply to Nima Eskandari

TI__Genius 9700 points

Nima,

Got it with many thanks.

Customer is going to use CMPA, CMPB and PRD as high resolution, with global reload and ePWM6 linked to ePWM5.

Some issues left, like HRPWM is not ouput.

Do we have a demo on this kind of configuration?

Br, Jordan

0 Jordan Zhou over 5 years ago in reply to Jordan Zhou

TI__Genius 9700 points

Here's the configure.

What's the relationship between high resolution PWM and global reload?

Br, Jordan

0 Nima Eskandari over 5 years ago in reply to Jordan Zhou

TI__Guru 52010 points

You can use Global load mode with HR PWM. As you have in the code above, you can use CMPxHR and TBPRDHR using global load. I'm not sure why that configuration was not working. Are you sure this is a global load issue? can you see the values updated without the HR?

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TMS320F280049: GLDCTL2[OSHTLD] doubt