mirror of
https://github.com/fhgwright/SCSI2SD.git
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66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
// Copyright (C) 2014 Michael McMaster <michael@codesrc.com>
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//
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// This file is part of SCSI2SD.
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//
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// SCSI2SD is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// SCSI2SD is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with SCSI2SD. If not, see <http://www.gnu.org/licenses/>.
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// Library for sending packet data over a USB HID connection.
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// Supports reassembly of packets larger than the HID packet,
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define USBHID_LEN 64
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// Maximum packet payload length. Must be large enough to support a SD sector
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// + sector number + device number
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#define HIDPACKET_MAX_LEN 520
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#include <stddef.h>
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#include <stdint.h>
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// The first byte of each HID packet contains the hid chunk number.
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// High-bit indicates a final chunk.
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// The second byte of each HID packet contains the payload length.
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// Call this with HID bytes received. len <= USBHID_LEN
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void hidPacket_recv(const uint8_t* bytes, size_t len);
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// Returns the received packet contents, or NULL if a complete packet isn't
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// available.
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const uint8_t* hidPacket_getPacket(size_t* len);
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// Returns the received packet contents, or NULL if a complete packet isn't
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// available. Does not modify state
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const uint8_t* hidPacket_peekPacket(size_t* len);
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// Call this with packet data to send. len <= USBHID_LEN
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// Overwrites any packet currently being sent.
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void hidPacket_send(const uint8_t* bytes, size_t len);
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// Returns USBHID_LEN bytes to send in the next HID packet, or
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// NULL if there's nothing to send.
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const uint8_t* hidPacket_getHIDBytes(uint8_t* hidBuffer);
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// Returns 1 if hidPacket_getHIDBytes will return non-null
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int hidPacket_getHIDBytesReady();
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void hidPacket_reset();
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#ifdef __cplusplus
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} // extern "C"
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#endif
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