基于BS21_T20 BLE加入hid 复合设备的方法

angel_shi

1、以ble键盘为例：
在hid remap数据组里，为了测试方便，在remap数值里增加了同样的键盘report，但是注意要修改report id，特征描述是需要传入report id；


2、在原有hid中增加特征：参考代码如下：



/* 添加描述符：HID report reference */
static void ble_add_hid_report_descriptor(uint8_t server_id, uint16_t srvc_handle, uint8_t * value, uint16_t len)
{
    gatts_add_desc_info_t descriptor = {
        .permissions = GATT_ATTRIBUTE_PERMISSION_READ,
        .value = value,
        .value_len = len,
    };
    bts_data_to_uuid_len2(BLE_UUID_REPORT_REFERENCE, &descriptor.desc_uuid);
    gatts_add_descriptor(server_id, srvc_handle, &descriptor);
}

static void ble_hid_add_character_custom_report(uint8_t server_id, uint16_t srvc_handle)
{
    uint8_t value[7] = { 0 };
    gatts_add_character_result_t handle_result = { 0 };
    gatts_add_chara_info_t character = {
        .permissions = GATT_ATTRIBUTE_PERMISSION_READ,
        .properties = HID_INPUT_REPORT_PROPERTIES,
        .value_len = sizeof(value),
        .value = value,
    };
    bts_data_to_uuid_len2(BLE_UUID_REPORT, &character.chara_uuid);
    if (gatts_add_characteristic_sync(server_id, srvc_handle, &character, &handle_result) == ERRCODE_SUCC)
    {
        ble_hid_add_descriptor_ccc(server_id, srvc_handle);

        uint8_t report_reference[] = { 2, 1 };
        ble_add_hid_report_descriptor(server_id, srvc_handle, report_reference, sizeof(report_reference));
        g_char_value_handle.nkro_handle = handle_result.value_handle;
    }
}