Changes between Version 4 and Version 5 of TBR/Website/FAQ

Timestamp:

04/30/07 04:49:00 (17 years ago)

Author:

Paulw

Comment:

Descript RTEMS_IO_RCVWAKEUP

TBR/Website/FAQ

@@ -22 +22 @@
 
 Not that I know of but I do know Robert Wade. :)
+
+
+5. ''Does RTEMS support select() on serial ports 
+
+No. However, there is a method to register a call back on serial communications that can be used 
+for the same effect.  ioctl( fd, RTEMS_IO_RCVWAKEUP, &wakeup);
+
+Here is a code snippet:
+
+void receive_callback(struct termios *tty, void * arg )
+{
+    (void) rtems_event_send( (rtems_id) arg, EVENT_RS232_RX );
+}
+
+To install the callback 
+
+   rtems_id task;
+   struct ttywakeup wakeup;
+
+   rtems_task_ident( RTEMS_SELF, RTEMS_LOCAL, &task);
+
+   wakeup.sw_pfn = receive_callback;
+   wakeup.sw_arg = (void *) task ;
+
+   ioctl( fd, RTEMS_IO_RCVWAKEUP, &wakeup);