TMS320F28388D: What is ECAP_OUT_EN input to CLB?

Sh.Sasaki

Part Number: TMS320F28388D

Hi,

What is the source of the ECAP_OUT_EN signal?
I think ECAP_OUT is the APWM output, but I don't know what ECAP_OUT_EN is.

Best regards,
Sasaki

over 3 years ago

0 Aditya Dholakia over 3 years ago

TI__Expert 7200 points

Hi Sasaki,

The ECAPOUT_EN bit is the enable out which comes from the ECAP if the module is operated in APWM mode.

There is an old thread where it is discussed in little more detail: https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/966073/tms320f28379d-clb-ecap-peripheral-signal-multiplexer-question

Thanks,

Aditya

0 Sh.Sasaki over 3 years ago in reply to Aditya Dholakia

Guru 13625 points

Hi Aditya-san,

Thank you for your support.

I checked the link but could not find how to set ECAP_OUT_EN. is ECAP_OUT_EN set in a register in eCAP? I could not find the bit field to set ECAP_OUT_EN in the register.
What should I set if I want my ECAP output to be tri-state?

Best regards,
Sasaki

0 Aditya Dholakia over 3 years ago in reply to Sh.Sasaki

TI__Expert 7200 points

Hi Sasaki-san,

CAP_APWM should be the internal generating bit for the ECAPOUT_EN bit for the output buffer.

From the above marked thread: ECAPOUT_EN is the enable for the output buffer. If ECAP module is used in APWM mode [using CAP_APWM], PWM output signal and output enable for the buffer are generated - similar to PWM module.

Aditya

0 Sh.Sasaki over 3 years ago in reply to Aditya Dholakia

Guru 13625 points

Hi Aditya-san,

Thank you for your support.

I understand that ECAPOUT_EN is generated when in APWM mode and not a bitfield set by the user in a register.

Please tell me one more thing. What kind of signal is output from ECAPOUT_EN? I would like a diagram that shows the relationship between APWM and ECAPOUT_EN.

Best regards,
Sasaki

0 Aditya Dholakia over 3 years ago in reply to Sh.Sasaki

TI__Expert 7200 points

Santosh Jha Do we have waveforms ECAPOUT_EN mapping with ECAP_OUT that is provided in the TRM?

Aditya

0 Sh.Sasaki over 3 years ago in reply to Aditya Dholakia

Guru 13625 points

Do you have any update?

0 Santosh Jha over 3 years ago in reply to Sh.Sasaki

TI__Guru 50611 points

Hi,

There is no mapping in TRM. I am checking with design team. I will get back to you in a day or two.

Thanks & Regards,

Santosh

0 Sh.Sasaki over 3 years ago in reply to Santosh Jha

Guru 13625 points

Hi Santosh-san,

Thank you for your reply.

I looking foward to hearingu form you.

Best regards,
Sasaki

0 Santosh Jha over 3 years ago in reply to Sh.Sasaki

TI__Guru 50611 points

Sasaki-san,

As Aditya said, CAP/APWM operating mode select is for ECAPOUT_EN

and ECAPOUT for ECAPx, ties to GPIO out pin.

There is no waveform in TRM.

Thanks & Regards,

Santosh

0 Sh.Sasaki over 3 years ago in reply to Santosh Jha

Guru 13625 points

Hi Santosh-san,

I understood the following
When eCAP is used in APWM mode, PWM is output from ECAPT_OUT and High is output from ECAP_OUT_EN.
If eCAP is not used in APWM mode, Low is output from ECAP_OUT_EN.

Are these correct?

Best regards,
Sasaki

+1 Santosh Jha over 3 years ago in reply to Sh.Sasaki

TI__Guru 50611 points

Hi Sasaki-san,

That is correct.

THanks & Regards,

Santosh

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TMS320F28388D: What is ECAP_OUT_EN input to CLB?