February 01, 2019
GPIO pin interfacing has been very popular these days among IOT devices mainly since their introduction on Raspberry pi, Connect Tech Cogswell carrier board also provides GPIO expander port which can be configured using I2C interfacing, here I will try to explain the GPIO pin layout and I2C expander configuration on Cogwell.
February 10, 2019
configuring GPIO pins sourced through external EXAR XRA1200 expanders on connect tech cogswell carrier board requires interfacing through I2C to enable reading and writing data to and from GPIO pins on the board. The pins sourced through expanders cannot be configured using Linux sysfs utilities they can only be configured and communicated using I2c.