69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
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/*
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* Copyright 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <memory>
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#include <vector>
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#include "hci_internals.h"
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#include "hci_packetizer.h"
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namespace android::hardware::bluetooth::hci {
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using PacketReadCallback = std::function<void(const std::vector<uint8_t>&)>;
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using DisconnectCallback = std::function<void(void)>;
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class H4Protocol {
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public:
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H4Protocol(int fd, PacketReadCallback cmd_cb, PacketReadCallback acl_cb,
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PacketReadCallback sco_cb, PacketReadCallback event_cb,
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PacketReadCallback iso_cb, DisconnectCallback disconnect_cb);
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size_t Send(PacketType type, const uint8_t* data, size_t length);
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size_t Send(PacketType type, const std::vector<uint8_t>& data);
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void OnDataReady();
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protected:
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size_t OnPacketReady(const std::vector<uint8_t>& packet);
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void SendDataToPacketizer(uint8_t* buffer, size_t length);
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private:
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int uart_fd_;
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bool disconnected_{false};
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PacketReadCallback cmd_cb_;
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PacketReadCallback acl_cb_;
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PacketReadCallback sco_cb_;
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PacketReadCallback event_cb_;
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PacketReadCallback iso_cb_;
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DisconnectCallback disconnect_cb_;
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PacketType hci_packet_type_{PacketType::UNKNOWN};
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HciPacketizer hci_packetizer_;
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/**
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* Question : Why read in single chunk rather than multiple reads?
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* Answer: Using multiple reads does not work with some BT USB dongles.
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* Reading in single shot gives expected response.
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* ACL max length is 2 bytes, so using 64K as the buffer length.
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*/
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static constexpr size_t kMaxPacketLength = 64 * 1024;
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};
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} // namespace android::hardware::bluetooth::hci
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