ADSP21369 / AD1835A L/R Audio Channel Help please?

Hi Bart,

          You may use the L_First bit of the SPCTLx register for this purpose. Please refer the HRM for more details. This bit indicates the SPORT on which edge it should start the data transfer.

For I2S mode channel order:

0 = first data after the falling edge

1 = first data after the rising edge

In case you are using I2S mode when this bit is cleared the SPORT will start receive the first data after the falling edge. This will be the left channel data. Based on this you can have a software flag to indicate whether the data received it left or right. Or you may use the same buffer in which the locations like 0,2,4 etc will have left channel data and 1,3,5 etc will have right channel data. You may process them independantly.

Best Regards,

Jeyanthi

Hi Jeyanthi,

I was contemplating doing a software bit toggle however was expecting a status bit somewhere which would save me the bother.

Any way thank you for your time and help.

Much appreciated.

Regards

Bart

Hi Bart,

           If you are looking for a status bit part of the data which will indicate whether it is a right channel data/left channel data then you may use IDP for this purpose. The Input Data ports are the serial slave receivers. You need to connect the BCLK, FS and Data from the ADC to IDP signals. And configure the IDP for 24-bit I2S mode. The LSB 4-bits will have the status of the incoming data where bit 3 indicates whether it is a Left/Right channel. You may need to follow some initial synchronization before enabling the IDP. Please refer the ADSP-21368 HRM for more details.

Best Regards,

Jeyanthi

Hi Jeyanthi,

Thank you for the reply,

I have got the software toggle working and have the data runnning through a FIR filter.

If i get some time i will have a play with the method you have suggested.

Many thanks.

Regards

Bart