From looking at the PCAL6408A datasheet I see that it is controlled by I2C (TWI). We do not have any example of using that device specifically, but you can use the TWI master driver to communicate with it. The TWI Sensor Example has a practical example of using the driver. For the details of how to control the PCAL6408A, you have to refer to it's datasheet.
That should be possible. Though I am not sure you gain much by adapting the code you refer to. It is anyway so few lines and a simple device, so I would think it was easier to implement something from scratch using our driver, perhaps looking at the file you refer to for inspiration (in addition to the datasheet).
That should be possible. Though I am not sure you gain much by adapting the code you refer to. It is anyway so few lines and a simple device, so I would think it was easier to implement something from scratch using our driver, perhaps looking at the file you refer to for inspiration (in addition to the datasheet).
