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MRobe100, HD200, Gigabeat F/X (anything with wm8750 or wm8751). Properly prescale bass and treble controls to avoid clipping.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25940 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2010-05-11 04:02:45 +00:00
parent 7d21e5ab32
commit 8ce5b01ec7
3 changed files with 21 additions and 8 deletions
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14
firmware/drivers/audio/wm8751.c
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@ -61,6 +61,8 @@ const struct sound_settings_info audiohw_settings[] = {
/* We use linear treble control with 4 kHz cutoff */
#define TREBCTRL_BITS (TREBCTRL_TC)
static int prescaler = 0;
/* convert tenth of dB volume (-730..60) to master volume register value */
int tenthdb2master(int db)
{
@ -173,6 +175,10 @@ void audiohw_postinit(void)
PWRMGMT2_ROUT2);
#endif
/* Full -0dB on the DACS */
wmcodec_write(LEFTGAIN, 0xff);
wmcodec_write(RIGHTGAIN, RIGHTGAIN_RDVU | 0xff);
wmcodec_write(ADDITIONAL1, ADDITIONAL1_TSDEN | ADDITIONAL1_TOEN |
ADDITIONAL1_DMONOMIX_LLRR | ADDITIONAL1_VSEL_DEFAULT);
@ -249,6 +255,14 @@ void audiohw_set_treble(int value)
TREBCTRL_TREB(tone_tenthdb2hw(value)));
}
void audiohw_set_prescaler(int value)
{
prescaler = 2 * value;
wmcodec_write(LEFTGAIN, 0xff - (prescaler & LEFTGAIN_LDACVOL));
wmcodec_write(RIGHTGAIN, RIGHTGAIN_RDVU |
(0xff - (prescaler & RIGHTGAIN_RDACVOL)));
}
/* Nice shutdown of WM8751 codec */
void audiohw_close(void)
{