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btstack_hid_parser: ignore Report ID in Descriptor Usage iterator bit position

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This commit is contained in:
Matthias Ringwald 2024-08-13 17:34:15 +02:00
parent a05e6df3cc
commit 619253e6ff
2 changed files with 7 additions and 1 deletions
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6
src/btstack_hid_parser.c
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@ -326,7 +326,7 @@ static void btstack_parser_usage_iterator_process_item(btstack_hid_usage_iterato
btstack_hid_usage_iterator_handle_global_item(iterator, item);
// track record id for report handling, reset report position
if (report_id_before != iterator->global_report_id){
iterator->report_pos_in_bit = 8u;
iterator->report_pos_in_bit = 0u;
}
break;
case Local:
@ -491,6 +491,10 @@ void btstack_hid_parser_get_field(btstack_hid_parser_t * parser, uint16_t * usag
*usage_page = parser->descriptor_usage_item.usage_page;
*usage = parser->descriptor_usage_item.usage;
// skip optional Report ID
if (parser->descriptor_usage_item.report_id != HID_REPORT_ID_UNDEFINED){
bit_pos += 8;
}
// read field (up to 32 bit unsigned, up to 31 bit signed - 32 bit signed behaviour is undefined) - check report len
bool is_variable = (parser->descriptor_usage_item.descriptor_item.item_value & 2) != 0;

2
src/btstack_hid_parser.h
View File

@ -134,6 +134,8 @@ typedef struct {
hid_descriptor_item_t descriptor_item;
hid_report_type_t report_type;
// report bit pos does not include the optional Report ID
uint16_t report_pos_in_bit;
// usage pos and usage_page after last main item, used to find next usage