hidd_set_usage_value()
Set value in report
Synopsis:
#include <sys/hiddi.h>
int hidd_set_usage_value( struct hidd_report_instance *report_instance,
struct hidd_collection *collection,
_Uint16t usage_page,
_Uint16t usage,
_Uint32t usage_value,
_Uint8t *report_data,
_Uint16t len);Arguments:
- report_instance
-
The HID stack connection handle (from hidd_connect()).
- collection
-
Handle of the collection, as returned by hidd_get_collections() or by hidd_report_collection(). If collection is NULL, all collections are searched, other wise only the collection specified is searched.
- usage_page
-
The usage page of the report (refer to the HID spec and HID usage tables).
- usage
-
The usage page of the report (refer to the HID spec and HID usage tables).
- usage_value
- The value to set.
- report_data
-
The report buffer you wish to fill in.
- len
-
The length of the provided report buffer.
Description:
The hidd_set_usage_value() function sets the value for the usage defined in the usage_page in the provided report buffer. You would typically use this function to fill in a output/feature report before sending it to a HID device.
Returns:
- EOK
- Success.
- ENOTCONN
- The report_instance or report_data is NULL.
- ENOENT
-
There is no entry in the report for usage_page or usage.
Classification:
QNX OS
| Safety: | |
|---|---|
| Cancellation point | Yes |
| Signal handler | No |
| Thread | Yes |