hidd_set_buttons()
Set buttons in a report
Synopsis:
#include <sys/hiddi.h>
int hidd_set_buttons( struct hidd_report_instance *report_instance,
struct hidd_collection *collection,
_Uint16t usage_page,
_Uint16t *usage_list,
_Uint16t usage_len,
_Uint8t *report_data,
_Uint16t buff_len );Arguments:
- report_instance
-
The handle of a report (from hidd_report_attach()).
- collection
-
The handle of the collection, as returned by hidd_get_collections() or by hidd_report_collection().
- usage_page
-
The usage page of a collection (refer to the HID spec and HID usage tables).
- usage_list
-
An array of usages you wish to set (refer to the HID spec and HID usage tables).
- usage_len
-
The number of elements in the usages. On return, contains the number of usages filled in.
- report_data
-
The report buffer you wish to fill in.
- buff_len
-
The length of the provided report buffer.
Description:
The hidd_set_buttons() function sets the buttons to activate for the usages defined in usage_page in the provided report buffer. You would typically use this function to fill in a output or feature report before sending it to a HID device.
Returns:
- EOK
- Success.
- ENOSPC
-
The provided report buffer isn't large enough.
- ENOENT
-
One or more of the usages provided does not exist in the report.
- EINVAL
-
The report_instance, report_data, or usage_list argument is NULL.
Classification:
QNX OS
| Safety: | |
|---|---|
| Cancellation point | Yes |
| Signal handler | No |
| Thread | Yes |