+/*
+ * Author: Brendan Le Foll <brendan.le.foll@intel.com>
+ * Copyright (c) 2014 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <iostream>
+#include <unistd.h>
+#include <stdlib.h>
+#include <functional>
+#include <string.h>
+#include "mic.h"
+
+using namespace upm;
+
+Microphone::Microphone(int micPin) {
+ // initialise analog mic input
+ m_micCtx = maa_aio_init(micPin);
+
+
+}
+
+Microphone::~Microphone() {
+ // close analog input
+ maa_result_t error;
+ error = maa_aio_close(m_micCtx);
+ if (error != MAA_SUCCESS) {
+ maa_result_print(error);
+ }
+}
+
+int
+Microphone::getSampledWindow (unsigned int freqMS, unsigned int numberOfSamples,
+ uint16_t * buffer) {
+ int sampleIdx = 0;
+
+ // must have freq
+ if (!freqMS) {
+ return 0;
+ }
+
+ // too much samples
+ if (numberOfSamples > 0xFFFFFF) {
+ return 0;
+ }
+
+ while (sampleIdx < numberOfSamples) {
+ buffer[sampleIdx++] = maa_aio_read (m_micCtx);
+ usleep(freqMS * 1000);
+ }
+
+ return sampleIdx;
+}
+
+int
+Microphone::findThreshold (thresholdContext* ctx, unsigned int threshold,
+ uint16_t * buffer, unsigned int len) {
+ long sum = 0;
+ for (unsigned int i = 0; i < len; i++) {
+ sum += buffer[i];
+ }
+
+ ctx->averageReading = sum / len;
+ ctx->runningAverage = (((ctx->averagedOver-1) * ctx->runningAverage) + ctx->averageReading) / ctx->averagedOver;
+
+ if (ctx->runningAverage > threshold) {
+ return ctx->runningAverage;
+ } else {
+ return 0;
+ }
+}
+
+void
+Microphone::printGraph (thresholdContext* ctx) {
+ for (int i = 0; i < ctx->runningAverage; i++)
+ std::cout << ".";
+ std::cout << std::endl;
+}