7.1 GPIO Interface Commands and Their Responses

The MCP2222 supports GPIO control through the vendor class, providing commands that allow the USB host to configure and control the device’s I/O pins.

The following endpoints are used for GPIO control:

• Endpoint 0x04 (OUT) → Used to send GPIO commands
• Endpoint 0x84 (IN) → Used to read GPIO command responses and input pin states

  Table 7-1. GPIO Interface Commands

  Command	Effect
  IO_SetConfiguration	Configures the selected I/O pin
  GPIO_Write	Sets the selected GPIO output pin to the selected logic state
  GPIO_Read	Reads and returns the logic state of the selected GPIO pin
  IO_GetConfiguration	Reads and returns the configuration of the selected I/O pin