HID media control using CC2540

kimi hu

Hi,

i can use keyfob to simulate keyboard with win8, but i can not control media function(like: volume up, volume down, mute)

i modify hidReportMap in hidkbdservice.c(profile: HIDDevKbd)

145 static CONST uint8 hidReportMap[] =
146 {
147 0x05, 0x0C, // Usage Page (Consumer Devices)
148 0x09, 0x01, // Usage (Consumer Control)
149 0xA1, 0x01, // Collection (Application)
150 0x15, 0x00, // Logical Minimum (0)
151 0x25, 0x01, // Logical Maximum (1)
152 0x09, 0xE9, // Usage (Volume Up)
153 0x09, 0xEA, // Usage (Volume Down)
154 0x75, 0x01, // Report Size (1)
155 0x95, 0x02, // Report Count (2)
156 0x81, 0x02, // Input (Data, Variable, Absolute)
157 0x09, 0xE2, // Usage (Mute)
158 0x95, 0x01, // Report Count (1)
159 0x81, 0x06, // Input (Data, Variable, Relative)
160 0x95, 0x05, // Report Count (5)
161 0x81, 0x07, // Input (Constant)
162 0xC0 // End Collection
163 };

how do i send out these command and OS will work correctly?

thanks

over 13 years ago

Abdul Mutaal Ahmad1 over 12 years ago

Prodigy 30 points

Hi,

I am also trying to do the same. In previous standard we used to define a separate interface descriptor for consumer control along with a standard keyboard interface descriptor.

if you get anything substaintail, do share here.

Thanks

MaciejKucia over 12 years ago

Mastermind 7925 points

kimi hu said:

how do i send out these command and OS will work correctly?

You have your report descriptor now you need to send report. I can see that the report will be exactly 1 byte. So you just set appropriate bits and reports this 1 byte to host. How do you form and send report?

Not all HID-defined commands are being processed. This depends on software. What software you are testing it with? I believe volume and mute should work with Windows and WMP.

Abdul Mutaal Ahmad1 over 12 years ago in reply to MaciejKucia

Prodigy 30 points

Yeah, but that would only send volume control to the host. what if I want to use standard keyboard keys as well as volume control in a single device like most multimedia keyboard do. Do I have to define another report descrriptor or another report ?

Any changes you suggest in the current code?

Thanks

MaciejKucia over 12 years ago in reply to Abdul Mutaal Ahmad1

Mastermind 7925 points

What you need to do is to make 2 HID interfaces instead of 1. Fast Googling showed me this document with nice schematics: http://www.ece.rochester.edu/~parihar/pres/Report_MultiMedia-KB.pdf

If you have working Consumer Device demo you should be able to combine it with keyboard demo from TI. Of course USB HID documentation is always starting point.

Regards,
Maciej

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HID media control using CC2540