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CC256x I2S Testing - How to TX Test Data

I have the I2S bus setup correctly via the HCI_VS_Write_CODEC_Config command.  I have also put it into loopback mode via HCI_VS_PCM_Loopback_Enable to test it.  Now I would like to transmit a known value (from the cc256x I2S bus) so I can test the configuration of the I2S bus on the host processor.


I don't see a HCI command to do this.  I figured I could set the I2S TX data register directly via the HCI_VS_Write_Hardware_Register (0xFF01) command.  However, I can't find documentation that defines the cc256x hardware register addresses.

Can you provide a the cc256x hardware register addresses, or another means to inject data into the I2S TX?

Thanks,
Layne