Dear All
I'm trying to use the headset detection feature of the aic3254, but as soon as I turn it on, it results in a high frequency audio signal in the headphone output.
Basically I've a on board mic, biased from external (mic bias available on a 4 pins audio jack), the external bias is conncted to sclk/mfp3 input trough a 2.2K resistor.
Also a 100k resistor pulls down this sclk/mfp3 input.
If I turn on the hadset detection, I ear a high frequency audio signal to the headphones outs !
Here is the way I switch on the headset detection, any suggestion would be greatly appreciated.
###############################################
# Config headset detecttion
###############################################
#
# Select Page 0
w 30 00 00
# sclk/mfp3 is disabled to enable headset detect on mfp3
w 30 38 00
# enable headset detection 16ms debounce headset, 8ms debounce ptt
w 30 43 81
# enable itr INT2 for headset detetction, single 2ms pulse
w 30 31 80
# route INT2 to MISO/MFP4 output
w 30 37 0A
As soon as w 30 43 81 is received by the DSP, I can ear a noise as described above !
Thanks to all
Jerome
