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5c1ae51193
Playback is implemented using a target-specific PCM layer, using the STM32H7 SAI & DMA registers directly. There are a number of pop/click issues: 1. Slight click when powering up the amplifiers 2. Click when starting and stopping playback 3. Popping when changing playback frequency 4. Popping when shutting down It should be possible to eliminate or at least mitigate (2) to (4) in software, but (1) happens as a result of powering on the amplifiers while everything is muted so might be unavoidable. Change-Id: I398b66596176fb2341beb7deba7bf6f4f3fb82b3
33 lines
1.3 KiB
C
33 lines
1.3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2025 Aidan MacDonald
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __ECHOPLAYER_CODEC_H__
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#define __ECHOPLAYER_CODEC_H__
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#include <stdbool.h>
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/* -79 to 0 dB in 0.5 dB steps; software volume control
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* is used because the hardware volume controls "click"
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* when changing the volume */
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AUDIOHW_SETTING(VOLUME, "dB", 1, 5, -790, 0, -200);
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void audiohw_mute(bool mute);
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#endif /* __ECHOPLAYER_CODEC_H__ */
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