TMS320F28388D: Interface Enhanced Quadrature Encoder to MCU

Ahmed Hussein

Part Number: TMS320F28388D

I am Making Design for TMS320F28388D Microcontroller to interface with 4 quadrature encoders, but the MCU only have internal Three Enhanced Quadrature Encoder Pulse
(eQEP) modules.

I am Looking for the best approach to do that and had two options
1- connect the encoder output data directly to MCU "A, B, I" and use software to deal with the incoming data "More software headache - unwanted in my application".
2- use quadrature decoder IC like "LS7082" and it will do the headache part and give me "clock, direction, speed", I can spare 3 Pins to interface with it, the problem is that I couldn't find any reference design or trusted documentation using these ICs.

What would be the best approach to do?
Is there any better suggestion to follow rather than these two, specially the chosen quadrature decoder IC?

over 4 years ago

0 Himanshu Chaudhary60 over 4 years ago

TI__Expert 3720 points

Hi,

I would suggest you to look into the Configurable Logic Block (CLB) offered on F28388D device. CLB allows to integrate the customer logic and augment existing peripherals within the MCU so one idea could be to leverage CLB tiles for implementing additional encoder decoding logic for the fourth quadrature encoder. That would avoid additional CPU overhead for implementing the decoding logic in software.

Please find below the useful resources and training materials to learn more about CLB:

If my reply answers your question please click on "This resolved my issue" button located at the bottom of my post.

Regards

Himanshu

0 Ahmed Hussein over 4 years ago in reply to Himanshu Chaudhary60

Prodigy 200 points

Hi Himanshu,

thank you for your response.

I am looking at CLB now and would like to know is there any source code or Libraries to implement enhanced Quadrature Encoder Module same as the one integrated inside MCU, using 3 signals A, B & Index.

thanks again

0 Lori Heustess over 4 years ago in reply to Ahmed Hussein

TI__Guru* 91940 points

Ahmed,

We do not currently have source code for a QEP on CLB. However, late last year, I put together some thoughts on this specific topic and have a paper design that you could leverage. I'm attaching it here.

Best Regards,

Lori

CLB_QEP_decoder_implementation_2020_10_22_v04.pdf

0 Ahmed Hussein over 4 years ago in reply to Lori Heustess

Prodigy 200 points

thanks Lori.

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TMS320F28388D: Interface Enhanced Quadrature Encoder to MCU