+/*
+ * Copyright (c) 2008, Titanium Mirror, Inc.
+ * 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 Titanium Mirror, Inc. 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 COPYRIGHT
+ * OWNER OR 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.
+ */
+
+/**
+ * A generic component that multiply samples via the ADC, returning the sum of
+ * ADC sample values.
+ *
+ * @author R. Steve McKown <smckown@gmail.com>
+ */
+
+generic module MultiSampleP(typedef val_t @integer(), uint16_t count) @safe()
+{
+ provides {
+ interface Get<uint16_t> as Count;
+ interface Read<val_t>;
+ }
+ uses interface ReadStream<uint16_t>;
+}
+implementation
+{
+ bool busy;
+ uint16_t values[count];
+
+ command uint16_t Count.get()
+ {
+ return count;
+ }
+
+ command error_t Read.read()
+ {
+ if (busy)
+ return EBUSY;
+
+ if (call ReadStream.postBuffer(values, count) != SUCCESS ||
+ call ReadStream.read(0) != SUCCESS)
+ return FAIL;
+
+ busy = TRUE;
+ return SUCCESS;
+ }
+
+ void signalReadDone(error_t error)
+ {
+ val_t sum = 0;
+
+ if (error == SUCCESS) {
+ uint16_t i;
+
+ /* Average all the incoming readings */
+ for (i = 0; i < count; i++)
+ sum += values[i];
+ }
+ busy = FALSE;
+ signal Read.readDone(error, sum);
+ }
+
+ event void ReadStream.bufferDone(error_t error, uint16_t* buf,
+ uint16_t _count)
+ {
+ /* FIXME: count comes back as zero, so ignore it. Up to 16 reads work. */
+ if (error != SUCCESS /*|| _count != count*/)
+ signalReadDone(FAIL);
+ }
+
+ event void ReadStream.readDone(error_t error, uint32_t usActualPeriod)
+ {
+ signalReadDone(error);
+ }
+}