RMT Start receive status (IDFGH-15270)

[janav1]

Is your feature request related to a problem?

It would be great if the RMT library could provide the state of the rmt peripheral - specifically whether data is already being received. Right now I can just call start and when the data is received, an interrupt will occur. I use the RMT peripheral to receive long data (several seconds) and it would be good to know that the data is already being received. Either by some status bit or by using an interrupt.

Describe the solution you'd like.

No response

Describe alternatives you've considered.

I am currently using an RMT peripheral to receive the data and an interrupt from the same pin to signal the start of data reception.

Additional context.

No response

[wanckl]

@janav1 Hi, to know when hardware actually start receiving, it depens on if hardware provide this statu, let we have a check, thank you!

[Kainarx]

Hi @janav1
After calling rmt_receive, reception starts on the first signal edge (level transition).
You can use a GPIO interrupt: configure a GPIO interrupt on the same pin used for RMT reception. This way, you can detect when data transmission begins, as it will trigger an interrupt on the first level change. And we will improve our documentation.

P.S. I'm curious—what kind of application needs to know the exact moment reception starts? If you're willing to share, I'd love to hear more about it.

[janav1]

Dear Kainarx,
I already use the solution you suggested. We don't want to know the exact start of reception, but since the signal lasts for several seconds, we need to know that we won't interrupt the reception in progress. If the hardware provide this information, it would be a more elegant solution.

[Kainarx]

I already use the solution you suggested. 👍

Thank you for your feedback. This is indeed a point that deserves improvement. We will consider improvements in the subsequent hardware design.