PCM2904: Enabling the HID function

Roy Hsu

Genius 9320 points

Part Number: PCM2904
Other Parts Discussed in Thread: PCM2906C, HID2

Hi Team,

How do I enable the HID function of the PCM2904?

I guess I need to enable the HID end-point since the control end-point is the default setting.

But I don't see the way to change it in the datasheet. Please help!

Thanks!

Roy Hsu

over 6 years ago

0 Diego Melendez over 6 years ago

TI__Guru 57800 points

Hi, Roy,

I think the HID controls are actually enabled as soon as the HID interrupt is triggered. I will look for more information about this and will get back to you.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

0 Roy Hsu over 6 years ago in reply to Diego Melendez

TI__Genius 9320 points

Hi Diego,

Would you be able to test this function on the EVM?

My customer told me that nothing seemed to have changed when they controlled the HID inputs.

Thanks!

Roy Hsu

0 Diego Melendez over 6 years ago in reply to Roy Hsu

TI__Guru 57800 points

Hi, Roy,

The PCM2904 actually has the same behavior and performance as the PCM2906C, so I tried with the PCM2906C EVM. In the EVM, once triggering the HID inputs, I am able to see the respective actions in the computer. HID0 triggers a mute command, HID1 increases volume and HID2 decreases volume.

Please note that the PCM2904 has some issues highlighted on the PCM290x errata, available in the product folder of the device in ti.com. The HID interface is not listed so you should not have any issues with the HID function and PCM2904.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

0 Roy Hsu over 6 years ago in reply to Diego Melendez

TI__Genius 9320 points

Hi Diego,

Appreciate your quick support and effort!

I will check with the customer again on this.

Thanks!

Roy Hsu

Audio

Audio forum

PCM2904: Enabling the HID function