updated ui added new features

third_party/codec2/stm32/inc/tone.h

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+#ifndef _TONE_H
+#define _TONE_H
+/*!
+ * Fixed-point tone generator.
+ *
+ * The code here implements a simple fixed-point tone generator that uses
+ * integer arithmetic to generate a sinusoid at a fixed sample rate of
+ * 16kHz.
+ *
+ * To set the initial state of the state machine, you specify a frequency
+ * and duration using tone_reset.  The corresponding C file embeds a
+ * sinusoid look-up table.  The total number of samples is computed for
+ * the given time and used to initialise 'remain', 'time' is initialised
+ * to 0, and 'step' gives the amount to increment 'time' by each iteration.
+ *
+ * The samples are retrieved by repeatedly calling tone_next.  This
+ * advances 'time' and decrements 'remain'.  The tone is complete when
+ * 'remain' is zero.
+ *
+ * Author Stuart Longland <me@vk4msl.id.au>
+ * Copyright (C) 2015 FreeDV project.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License version 2.1,
+ * as published by the Free Software Foundation.  This program is
+ * distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+
+/*! Tone sampling rate in Hz. */
+#define TONE_FS	16000
+
+/*!
+ * Tone generator state.  This holds the current state of the tone
+ * generator in order to decide what sample to release next.
+ */
+struct tone_gen_t {
+	/*! Current sample.  (Q12) */
+	uint32_t	sample;
+	/*!
+	 * Time remaining in samples. (integer)  Playback is finished
+	 * when this reaches zero.
+	 */
+	uint16_t	remain;
+	/*!
+	 * Subsample step (Q12).  This is the number of samples (or part
+	 * thereof) to advance "sample".  Special case: when zero, sample
+	 * is not advanced, silence is generated instead.
+	 */
+	uint16_t	step;
+};
+
+/*!
+ * Re-set the tone generator.
+ *
+ * @param	tone_gen	Tone generator to reset.
+ * @param	freq		Frequency in Hz, 0 = silence.
+ * @param	duration	Duration in milliseconds.  0 to stop.
+ */
+void tone_reset(
+	struct tone_gen_t* const tone_gen,
+	uint16_t freq, uint16_t duration);
+
+/*!
+ * Retrieve the next sample from the tone generator.
+ * @param	tone_gen	Tone generator to update.
+ */
+int16_t tone_next(
+	struct tone_gen_t* const tone_gen);
+
+/*!
+ * Retrieve the current time in milliseconds.
+ */
+uint32_t tone_msec(const struct tone_gen_t* const tone_gen);
+
+#endif