usbmsg_filter — Adds a message class filter to a handler.
extern int usbmsg_filter(usbmsg_handler_t handler, void* pw, usbmsg_class_t msgclass, int enable);
| handler pointer to message handler as used when registering handler. |
| pw private word as passed when registering handler. |
| msgclass message class to apply filter to. |
| enable 0 to disable filter and 1 to enable. |
Adds a message class filter to a handler. Used to enable a handler to only recive messages it wants to process.