General Purpose I/O

Some adapters (SyncLink GT series) have general purpose input/output (GPIO) signals that are accessible by a header (plug) on the adapter. These signals may be used for custom applications, and can be controlled through the HDLC API.

There are three types of GPIO signals:

• Dedicated Input
  
• Dedicated Output
  
• Configurable Input/Output
  

The number and type of GPIO signals varies by adapter, up to a total of 32 signals. Inputs can be monitored for current state and state transitions. Outputs can be controlled to be a low or high logic value. Configurable signals can be set to be inputs or outputs.

GPIO functions use a GPIO_DESC structure defined in the mghdlc.h header file.

GPIO Functions