2021-01-14 01:00 AM
Hi All,
I wanted to implement functionality for the volume up/ volume down/ mute etc.
I Got the keycodes for those buttons in USB HID Usage table .
volume up = 128
volume down = 129
mute = 127
but it wont works in My USB HID keyboard code
How to implement this functionality
Regards,
STAR
2021-01-17 11:51 AM
You will need https://github.com/IntergatedCircuits/HidReportDef
then use this HID report descriptor:
static const uint8_t DescPlayerReport[] =
{
/* Consumer device as input controller */
HID_USAGE_PAGE_CONSUMER,
HID_USAGE_CMR_CONSUMER_CTRL,
HID_COLLECTION_APPLICATION(
HID_USAGE_MIN_8(0),
HID_USAGE_MAX_8(0xFF),
HID_REPORT_SIZE(8),
HID_REPORT_COUNT(1),
HID_LOGICAL_MIN_8(0),
HID_LOGICAL_MAX_8(0xFF),
HID_INPUT(Data_Arr_Abs),
),
};
Then you just need to send one byte messages (e.g. 128 and 0 to simulate press and release of volume up).