ESP32-S3-WROOM-1 preferred PINs for I2C and CAN

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MartinHaiden
Posts: 1
Joined: Fri Sep 03, 2021 7:48 am

ESP32-S3-WROOM-1 preferred PINs for I2C and CAN

Postby MartinHaiden » Fri Sep 03, 2021 8:23 am

Hello ESP32 Community! :)

I'd like to use the ESP32-S3 with I2C and CAN Bus communications.

Are there preferred PINs on the ESP32-S3 for this purpose?
Like for SPI (IO9 to IO14).

kind regards,
Martin
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Sprite
Espressif staff
Espressif staff
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Joined: Thu Nov 26, 2015 4:08 am

Re: ESP32-S3-WROOM-1 preferred PINs for I2C and CAN

Postby Sprite » Sat Sep 04, 2021 1:56 am

No, there are not. You can pick any pin for this (that is not input-only or used for other things like flash).
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dmaxben
Posts: 110
Joined: Thu Nov 16, 2017 6:04 pm

Re: ESP32-S3-WROOM-1 preferred PINs for I2C and CAN

Postby dmaxben » Mon Sep 13, 2021 3:36 pm

No, there are not. You can pick any pin for this (that is not input-only or used for other things like flash).
Can you use an input-only pin for TWAI-Rx?
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Sprite
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Espressif staff
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Joined: Thu Nov 26, 2015 4:08 am

Re: ESP32-S3-WROOM-1 preferred PINs for I2C and CAN

Postby Sprite » Tue Sep 14, 2021 1:08 am

You can; it's OK to use input-only pins for input-only functionality. (Thanks for pointing that out, it slipped my mind that CAN has a RX pin before the transceiver.)
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