2.9.4.4 USB_DEVICE_PRINTER_EVENT Enumeration

C

typedef enum {
  USB_DEVICE_PRINTER_GET_PORT_STATUS,
  USB_DEVICE_PRINTER_EVENT_WRITE_COMPLETE,
  USB_DEVICE_PRINTER_EVENT_READ_COMPLETE
} USB_DEVICE_PRINTER_EVENT;

Summary

USB Device Printer Function Driver Events

These events are specific to the USB Device Printer Function Driver instance. Each event description contains details about the parameters passed with event. The contents of pData depends on the generated event.

Members


Members	Description
USB_DEVICE_PRINTER_GET_PORT_STATUS	This event occurs when a host requests GET_PORT_STATUS class specific request.
USB_DEVICE_PRINTER_EVENT_WRITE_COMPLETE	This event occurs when a write operation is completed.
USB_DEVICE_PRINTER_EVENT_READ_COMPLETE	This event occurs when a read operation is completed.

Remarks

The USB Device Printer control transfer related events allow the application to defer responses. This allows the application some time to obtain the response data rather than having to respond to the event immediately. Note that a USB host will typically wait for event response for a finite time duration before timing out and canceling the event and associated transactions. Even when deferring response, the application must respond promptly if such time outs have to be avoided.