CCS/TMS320F28379D: Why is the ePWM3 used in PM_bissc_SystemTest ?

Jeong Jeon

Tool/software: Code Composer Studio

Hi,

There is only EPWM4 at Table 9. Resource Requirements in "C2000 Position Manager BISS-C Library User's Guide" but there are EPWM3 and EPWM4 on the sample code as below,

CpuSysRegs.PCLKCR2.bit.EPWM3 = 1;

CpuSysRegs.PCLKCR2.bit.EPWM4 = 1;

Can you explain why the ePWM3 is used?

and is it possible to change to other ePWMx instead of ePWM3 ?

over 5 years ago

0 Lori Heustess over 5 years ago

TI__Guru* 93800 points

Jeong,

I don't believe PWM3 is used. This may be leftover from a previous version. Have you tried commenting out the clock enable to see if it has any impact?

Regards

Lori

0 Jeong Jeon over 5 years ago in reply to Lori Heustess

Prodigy 220 points

Dear Lori,

Thank you for your reply.

I tried to do disable of ePWM3 as below. There is no clock out from ePWM4. I think they are linked.

CpuSysRegs.PCLKCR2.bit.EPWM3 = 0;

CpuSysRegs.PCLKCR2.bit.EPWM4 = 1;

Regards,

Jeong

0 Lori Heustess over 5 years ago in reply to Jeong Jeon

TI__Guru* 93800 points

Jeong,

I'll look into this and report back by end of business Thursday (US Central) if not sooner.

-Lori

0 Jeong Jeon over 5 years ago in reply to Lori Heustess

Prodigy 220 points

Lori,

Thank you for your help.

Jeong

0 Lori Heustess over 5 years ago in reply to Jeong Jeon

TI__Guru* 93800 points

Glad to help :)

-Lori

0 Lori Heustess over 5 years ago in reply to Lori Heustess

TI__Guru* 93800 points

Jeong,

On this device the CLB tile is clocked by the corresponding ePWM clock. i.e. Tile 1 clocked by ePWMCLK1, Tile2 by ePWMCLK2 etc... The ePWM3 clock is enabled because the design uses Tile3. No other functionality of ePWM3 is used.

I've submitted a request to have this dependency documented in the data manual and Technical Reference Manual for the device and will update the BiSS documentation next time it is refreshed.

Regards,

Lori

0 Jeong Jeon over 5 years ago in reply to Lori Heustess

Prodigy 220 points

Lori,

Thank you for your reply !!

Regards,

Jeong

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CCS/TMS320F28379D: Why is the ePWM3 used in PM_bissc_SystemTest ?