Using DAVINCI_AUDIO_WORD_8 mode

 Debugging process:(set tx and rx loopback)

1.send data 0x00 to 0x1f,but can not receive all the data.

send :

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F

receive:

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

2 modify the code:

In function davinci_config_channel_size():

 switch (channel_size) {
 case DAVINCI_AUDIO_WORD_8:
  fmt = 0x03;
  rotate = 6;
 // mask = 0x000000ff;
  txmask=0x00ff0000;
  rxmask=0x000000ff;

  break;

In this case,we can recieve data,but the data is not same as we send.

send :

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F

receive:

00 01 02 03 04 05 06 07 08 09 0A 0B 00 00 0E 0F

10 11 12 13 14 15 16 17 18 19 1A 1B 00 00 1E 1F

We can see for the figure,0C,0D,1C and 1D are missing.

I have tried many times,but all failed.

Would you give me some suggestions?

Thank you very much.

BR

Bob

Hi Pavel,

Do you mean I use the DM814X TI EVM linux kernel?

BR

Bob

Hi Pavel,

After changing the value of rotate and fmt,it is ok now.

Thank you very much.

BR

Bob

Hi Pavel,

Thanks for your further information.

But I'm confused with data rotate in mcasp,could you give me more detailed  information ? So I can understand more.

Thanks.

BR

Bob

Hi Pavel,

Thank you.

BR

Bob