Can't use second I2C bus on seed

[jgoney]

Hi! The reason you can’t initialize I2C_2 is because that one’s already pre-allocated to the CODEC. Even though the MCU has 4 I2C peripherals, only two are exposed. Check this post for more info:

I2C_x initialisation

Oh wow, I missed that the graphic itself has that described. The csv file is correct, and most, if not all alternate functions available on the Daisy Seed. It also has the port/pin combo listed. Unfortunately only two I2C peripherals are fully exposed on the Daisy Seed. We’ll fix the diagram (and add the port/pin information to it) ASAP. The processor’s datasheet has the complete list of alternate functions for every pin on the chip. Though, I2C is designed to support multiple devices per bu…

Hope this helps!