2011/6/10 Péter Ujfalusi peter.ujfalusi@ti.com:
- when use Headset:
uplink routing:HSMIC --> AVTXR2PGA & AVTXL2PGA --> VDXS & VDXM --> PCM_VDX downlink routing:PCM_VDR --> VDR --> VRXPGA Fine gain --> DAC voice --> VDL_GAIN Analog PGA --> HSOL/HSOR
Thanks
I check the loopbacks,it seems that all Loopbacks have been disabled. bash-3.2# alsa_amixer |grep Loopback Simple mixer control 'Left Digital Loopback',0 Simple mixer control 'Left1 Analog Loopback',0 Simple mixer control 'Left2 Analog Loopback',0 Simple mixer control 'Right Digital Loopback',0 Simple mixer control 'Right1 Analog Loopback',0 Simple mixer control 'Right2 Analog Loopback',0 Simple mixer control 'Voice Analog Loopback',0 Simple mixer control 'Voice Digital Loopback',0
Can you check with: amixer | grep -A 6 Loopback
The sidetone is become louder if I increase the VSTPGA, and when I increase the VDL_GAIN Analog PGA,the sidetone is become louder too. But the VRXPGA seems don't affect the sidetone,so I think VSTPGA cause the sidetone.
2.when use Bluetooth: uplink routing:BT_PCM_VDR --> BTTXPGA --> VDXM --> PCM_VDX downlink routing:PCM_VDR --> VDR --> BTRXPGA --> BT_PCM_VDX
When use Bluetooth interface,I don't know if something else can cause sidetone except BTSTPGA.
I don't have a board, which have this feature, but I'll check the TRM and the code, if I can find something. Probably worth to find the ERRATA document as well...