13 Jun
2015
13 Jun
'15
12:10 p.m.
On Sat, 13 Jun 2015 09:15:49 +0200, Takashi Iwai wrote:
At Fri, 12 Jun 2015 21:47:46 +0200, Clemens Ladisch wrote:
Sergej Sawazki wrote:
The output of the DAC can be attenuated in 0.125dB steps, so 0x200 would be -64dB.
0.125 dB is too small for the 0.01 dB resolution of DECLARE_TLV_DB_SCALE, so you have to use DB_MINMAX instead: TLV_DB_MINMAX_MUTE_ITEM(-128, 0)
And you need to implement the ctl get/put callback to revert the value as (0x3ff - raw value). An decrement value isn't supposed to work.
Clemens, Takashi, thanks for your answers.
I am getting the expected dB scaling with: DECLARE_TLV_DB_MINMAX_MUTE(vol_tlv, -12800, 0) does it make sense?
Regards, Sergej