devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

recording on Samsung YH-820/YH-92x

Browse source 
Change-Id: I6eac4cf6c16a322910ad17bfbf3105e330cd0e36
Reviewed-on: http://gerrit.rockbox.org/815
Reviewed-by: Szymon Dziok <b0hoon@o2.pl>
Tested: Szymon Dziok <b0hoon@o2.pl>
This commit is contained in:
Sebastian Leonhardt 2014-05-30 00:26:27 +02:00 • committed by Szymon Dziok
parent 5237b36a85
commit 53efa59e12
6 changed files with 118 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

104
firmware/drivers/audio/ak4537.c
View file

@ -223,22 +223,116 @@ void audiohw_set_frequency(int fsel)
#if defined(HAVE_RECORDING)
void audiohw_enable_recording(bool source_mic)
{
(void)source_mic;
if (source_mic)
{
/* enable mic power supply */
#if defined(SAMSUNG_YH920) || defined(SAMSUNG_YH925)
/* additionally select external mic */
akc_set(AK4537_MIC, MPWRE | MSEL);
#else
akc_set(AK4537_MIC, MPWRI);
#endif
/* mic out is connected to line1 input */
akc_clear(AK4537_PM3, INL | INR);
/* route ALC output to ADC input */
akc_set(AK4537_MIC, MICAD);
/* set ALC (automatic level control) to manual mode */
akc_clear(AK4537_ALC1, ALC1);
/* set gain control to 'dependent' (left&right at the same time) */
akc_clear(AK4537_MIC, IPGAC);
/* power up mic preamp, left channel ADC and line in */
akc_set(AK4537_PM1, PMMICL | PMIPGL | PMADL);
/* power up right channel ADC and line in */
akc_set(AK4537_PM3, PMADR | PMIPGR);
}
else
{
/* disable mic power supply */
#if defined(SAMSUNG_YH920) || defined(SAMSUNG_YH925)
akc_clear(AK4537_MIC, MPWRE);
#else
akc_clear(AK4537_MIC, MPWRI);
#endif
/* disable mic preamp */
akc_clear(AK4537_PM1, PMMICL);
/* Select line1 input */
akc_clear(AK4537_PM3, INL | INR);
/* route ALC output to ADC input */
akc_set(AK4537_MIC, MICAD);
/* set ALC (automatic level control) to manual mode */
akc_clear(AK4537_ALC1, ALC1);
/* set gain control to independent left & right gain */
akc_set(AK4537_MIC, IPGAC);
/* power up left channel input and ADC */
akc_set(AK4537_PM1, PMADL | PMIPGL);
/* power up right channel input and ADC */
akc_set(AK4537_PM3, PMADR | PMIPGR);
}
}
void audiohw_disable_recording(void)
{
/* disable mic power supply */
#if defined(SAMSUNG_YH920) || defined(SAMSUNG_YH925)
akc_clear(AK4537_MIC, MPWRE);
#else
akc_clear(AK4537_MIC, MPWRI);
#endif
/* power down ADC, mic preamp and line amp */
akc_clear(AK4537_PM1, PMADL | PMMICL | PMIPGL);
akc_clear(AK4537_PM3, PMADR | PMMICR | PMIPGR);
}
void audiohw_set_recvol(int left, int right, int type)
{
(void)left;
(void)right;
(void)type;
switch (type)
{
case AUDIO_GAIN_MIC:
/* the mic preamp has a fixed gain of +15 dB. There's an additional
* activatable +20dB mic gain stage. The signal is then routed to
* the Line1 input, where you find the line attenuator with a range
* from -23.5 to +12dB, so we have a total gain range of -8.0 .. +47dB.
* NOTE: the datasheet state's different attenuator levels for mic and
* line input, but that's not precise. The +15dB difference result only
* from the mic stage.
* NOTE2: the mic is connected to the line1 input (via mic preamp),
* so if a line signal is present, you will always record a mixup.
*/
/* If gain is > 20 dB we use the additional gain stage */
if (left > 20) {
akc_set(AK4537_MIC, MGAIN);
left -= 20;
}
else {
akc_clear(AK4537_MIC, MGAIN);
}
/* the remains is done by the line input amp */
left = (left+8)*2;
akc_write(AK4537_IPGAL, left);
break;
case AUDIO_GAIN_LINEIN:
/* convert dB to register value */
left = (left+23)*2+1;
right = (right+23)*2+1;
akc_write(AK4537_IPGAL, left);
akc_write(AK4537_IPGAR, right);
break;
default:
return;
}
}
void audiohw_set_monitor(bool enable)
{
(void)enable;
if (enable)
/* mix input signal to headphone output */
akc_set(AK4537_SIGSEL2, MICL);
else
akc_clear(AK4537_SIGSEL2, MICL);
}
#endif /* HAVE_RECORDING */