We are trying to use the I2C BUS of the ConnectCore 9C dev board to connect a I2C multiplex chip (PCF8575 - 16 I/O expander). But we are only able to address the higher I/o ports (P8 to P15). We used the sample (I2C GPIO) provided by the dev kit as a reference and the necessary changes have been made according to the chip datasheet and specifications.
By the way, the on-board (dev kit) chip (PCA9554), a 8 ports I/O expander, works ok.
Someone managed to run the I2C BUS with a I2C device (chip) other than PCA9554 ?
We are using C# and the Digi BSP.