HID consumer page

[xianke]

{
0x05, 0x0c, // USAGE_PAGE (Consumer Devices)
0x09, 0x01, // USAGE (Consumer Control)
0xa1, 0x01, // COLLECTION (Application)

0x05, 0x0c, // USAGE_PAGE (Consumer Devices)
0x09, 0xE0, // USAGE (Volume)
0x15, 0xFF, // LOGICAL_MINIMUM (-1)
0x25, 0x01, // LOGICAL_MAXIMUM (1)
0x75, 0x02, // REPORT_SIZE (2)
0x95, 0x01, // REPORT_COUNT (1)
0x81, 0x46, // INPUT (Data,Var,Abs,NPrf)

0x95, 0x01, // REPORT_COUNT (1)
0x75, 0x06, // REPORT_SIZE (6)
0x15, 0x01, // LOGICAL_MINIMUM (1)
0x25, 0x06, // LOGICAL_MAXIMUM (6)
//0x19, 0x01, // USAGE_MINIMUM (Consumer Control)
//0x2a, 0x08, 0x01, // USAGE_MAXIMUM (Police Alarm)
0x09, 0xCD,
0x09, 0xB7,
0x09, 0xB6,
0x09, 0xB5,
//0x09, 0xEA,
//0x09, 0xE9,

0x81, 0x00, // INPUT (Data,Ary,Abs)

0xc0 // END_COLLECTION
}

Why it did not work when I send the 0x01 or 0x03 to the iphone with my device? The device had paired with iphone; and i can get the music play/pause with the cmd of 0x40.

[Håkon Alseth]

Hi,

 

Why it did not work when I send the 0x01 or 0x03 to the iphone with my device? The device had paired with iphone; and i can get the music play/pause with the cmd of 0x40.

Could you try this descriptor? It has mapped bit 0 to play/pause:

https://github.com/Rallare/nrf51_ble_app_hids_kbd_consumercontrol/blob/master/main.c#L622-L648 

 

Kind regards,

Håkon

[xianke]

I can get the music play/pause in my descriptor, but I can't volume up or volume down with the 0xE0(0x01 or 0x03),I just want to know why the volume(0xE0) not work in consumer page in my descriptor?

[Håkon Alseth]

0xE0 is the volume slider, and its defined as a "linear control", per this document chapter 3.4.1 (page 17):

https://www.usb.org/sites/default/files/documents/hut1_12v2.pdf

You have to have a logical min/max of -1 to 1.

If you turn to page 77 in the document, you can rather use 0xE9 and 0xEA to adjust volume if you want to send data in a bit pattern.

 

Kind regards,

Håkon

[xianke]

Yeah,I know. I also get the logical min/max of 0xE0 -1 to 1 in my descriptor. 

[Håkon Alseth]

I havent tested the linear control, unfortunately, but found an example of it here: https://github.com/microsoft/Windows-universal-samples/blob/master/Samples/CustomHidDeviceAccess/cs/SampleConfiguration.cs#L107

But, since you have it with increase / decrease of 1, why not use the two bits for volup + voldown?

 

Kind regards,

Håkon