rockbox/firmware/export/eros_qn_codec.h
Dana Conrad 17263a813b ErosQ (both): avoid clipping due to DC offset bandaid
Set the maximum volume on both hosted and native ports
to -2 dB.

Verified behavior here on native and by borkitall on irc
for hosted.

Change-Id: I3aebc2bb4b9294a4137a33694c83139c0d76099a
2021-09-05 15:50:21 +00:00

44 lines
1.6 KiB
C

/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
*
* Copyright (c) 2021 Andrew Ryabinin, Dana Conrad
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef _EROS_QN_CODEC_H
#define _EROS_QN_CODEC_H
/*
* Note: Maximum volume is set one step below unity in order to
* avoid overflowing pcm samples due to our DC Offset.
*
* The DAC's output is hot enough this should not be an issue.
*/
#define PCM5102A_VOLUME_MIN -740
#define PCM5102A_VOLUME_MAX -20
/* a small DC offset prevents play/pause clicking due to the DAC auto-muting */
#define PCM_DC_OFFSET_VALUE -1
AUDIOHW_SETTING(VOLUME, "dB", 0, 2, PCM5102A_VOLUME_MIN/10, PCM5102A_VOLUME_MAX/10, 0)
/* this just calls audiohw_set_volume() with the last (locally) known volume,
* used for switching to/from fixed line out volume. */
void pcm5102_set_outputs(void);
#endif