+/*
+ * Copyright (c) 2007 Stanford University.
+ * 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 Stanford University 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 STANFORD
+ * UNIVERSITY 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.
+ */
+
+/**
+ * @author Kevin Klues <klueska@cs.stanford.edu>
+ * @date August 20th, 2007
+ */
+
+generic module SharedAnalogDeviceP(uint32_t startup_delay) {
+ provides {
+ interface SplitControl;
+ interface Read<uint16_t>[uint8_t];
+ }
+ uses {
+ interface Resource as AnalogDeviceResource;
+ interface Timer<TMilli>;
+ interface GeneralIO as EnablePin;
+ interface ReadNow<uint16_t> as ActualRead;
+ }
+}
+implementation {
+ bool started = FALSE;
+ bool busy = FALSE;
+ uint8_t client_id;
+ norace error_t read_result;
+ norace uint16_t read_val;
+
+ command error_t SplitControl.start() {
+ error_t error;
+ if(started == FALSE) {
+ error = call AnalogDeviceResource.request();
+ if(error == SUCCESS)
+ started = TRUE;
+ return error;
+ }
+ return FAIL;
+ }
+
+ event void AnalogDeviceResource.granted() {
+ call EnablePin.makeOutput();
+ call EnablePin.set();
+ call Timer.startOneShot(startup_delay);
+ }
+
+ event void Timer.fired() {
+ signal SplitControl.startDone(SUCCESS);
+ }
+
+ task void stopDone() {
+ call AnalogDeviceResource.release();
+ started = FALSE;
+ signal SplitControl.stopDone(SUCCESS);
+ }
+
+ command error_t SplitControl.stop() {
+ if(started == TRUE) {
+ call EnablePin.clr();
+ call EnablePin.makeInput();
+ post stopDone();
+ return SUCCESS;
+ }
+ else if(busy == TRUE)
+ return EBUSY;
+ return FAIL;
+ }
+
+ command error_t Read.read[uint8_t id]() {
+ error_t error;
+ if(call AnalogDeviceResource.isOwner() && busy == FALSE) {
+ error = call ActualRead.read();
+ if(error == SUCCESS) {
+ busy = TRUE;
+ client_id = id;
+ }
+ return error;
+ }
+ return FAIL;
+ }
+
+ task void readDoneTask() {
+ busy = FALSE;
+ signal Read.readDone[client_id](read_result, read_val);
+ }
+
+ async event void ActualRead.readDone(error_t result, uint16_t val) {
+ read_result = result;
+ read_val = val;
+ post readDoneTask();
+ }
+}