Hello,
I am using an AKM AK5538 ADC in TDM512 mode (schematic attached). The DSP settings for Serial In 0 are also attached.
BCLKO0, LRCLK0 are outputs into the ADCs BCLK and LRCLK. MCLKO goes to ADC MCLK.
SDTO goes to SDATAIN0.
Unfortunately when attaching 8 level meters to the 8 inputs, I only see activity on channel 1 and 2.
Hello Sylwester,
Your project is working fine for me, I tried giving TDM16 inputs. please look below.
when input is given when no input is given
I see that you set the serial input port as TDM16 and you made the DSP master, so the BCLK going to the ADC will be 24.576MHz, this clock (512*fs) is for TDM512 mode (which is a chained mode) but now you are only using TDM8 Out from the ADC (TDM256 mode in your ADC). Since you are using 8 channels out from ADC, you just try running your ADC in TDM256 mode (TDM8 out which is 256*fs = 12.288MHz BCLK), to do that just set the serial input port as TDM8 (8 channels,32 bit per channel), it will generate 12.288MHz BCLK and send that to your ADC. Then it will be running at TDM8 mode.
They stay at -34dB when nothing is connected.
you disconnected the audio cable from the board, and it still shows -34dB? or did you stop playing the audio with the cable being connected?
but the inputs never go to 0
when no input is there, the meters will not go to 0 (which is a full-scale value - 0dBFS is full level), rather it goes down like around -80dB etc..
Did you probe the ADC out signals to see what it's sending?
Regards,
Harish
Hello,
I am not entirely sure if I am getting the channels correctly - my only test is currently with the VU meters, but cannot say if the data is correct or not, as I don't have a DAC attached (yet).
