XIAO ESP32C6 I2C Slave Pins?

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Hi there,

Which BSP are you using for the C6 compile ? The Pin macros may be used in this case if newer, ie. D4 & D5 in both cases.

Can you provide the compiler output for the S3 that works? the first 3 lines and the last 10 -12 before it uploads.
We can take a look. :+1:

HTH
GL :slight_smile: PJ :v:

meanwhile… Here is why it’s not working.

  • On ESP32-S3, Wire.onRequest() works because S3 supports I2C slave mode in hardware and in the Arduino core.

  • On ESP32-C6, only I2C Master mode is implemented in the Arduino Wire library as of BSP 3.2.0. "

  • Wire.onRequest() is not implemented for ESP32-C6 as of BSP v3.x (and even earlier).

  • Wire.slaveWrite() and I2C Slave Mode is not supported on the ESP32-C6 using the Arduino Wire library.

  • Even the call:

Wire.begin(0x42, 5, 6, 100000UL);

while syntactically valid, doesn’t actually configure the ESP32-C6 as an I2C slave, because slave mode isn’t available in the current ESP32-C6 Arduino core.
Wait for future support — but no timeline is guaranteed for I2C slave in ESP32-C6 via Arduino.

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