--- /dev/null
+/*
+ * Copyright (c) 2005 Arch Rock Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ * - Neither the name of the Arch Rock Corporation nor the names of
+ * its contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * ARCHED ROCK OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE
+ */
+
+/**
+ * Automatic slave select update for the SpiResource
+ *
+ * @author Miklos Maroti
+ */
+
+module HplCC2420SpiP
+{
+ provides interface Resource;
+
+ uses
+ {
+ interface Resource as SubResource; // raw SPI resource
+ interface GeneralIO as SS; // Slave set line
+ }
+}
+
+implementation
+{
+ async command error_t Resource.request()
+ {
+ return call SubResource.request();
+ }
+
+ async command error_t Resource.immediateRequest()
+ {
+ error_t error = call SubResource.immediateRequest();
+ if( error == SUCCESS )
+ {
+ call SS.makeOutput();
+ call SS.clr();
+ }
+ return error;
+ }
+
+ event void SubResource.granted()
+ {
+ call SS.makeOutput();
+ call SS.clr();
+
+ signal Resource.granted();
+ }
+
+ async command error_t Resource.release()
+ {
+ if( call SubResource.isOwner() )
+ call SS.set();
+
+ return call SubResource.release();
+ }
+
+ async command bool Resource.isOwner()
+ {
+ return call SubResource.isOwner();
+ }
+}