afff8b450f
The main difference with the USB HID communication is that the BLE data stream is encoded using HDLC framing with a 32 bit CRC checksum. Due to this encoding, the data packets can no longer be processed one by one (as is done for the USB HID packets). The entire HDLC encoded stream needs to be received before it can be processed. This requires some additional buffering.
52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/*
|
|
* libdivecomputer
|
|
*
|
|
* Copyright (C) 2008 Jef Driesen
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
|
* MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef CHECKSUM_H
|
|
#define CHECKSUM_H
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif /* __cplusplus */
|
|
|
|
unsigned char
|
|
checksum_add_uint4 (const unsigned char data[], unsigned int size, unsigned char init);
|
|
|
|
unsigned char
|
|
checksum_add_uint8 (const unsigned char data[], unsigned int size, unsigned char init);
|
|
|
|
unsigned short
|
|
checksum_add_uint16 (const unsigned char data[], unsigned int size, unsigned short init);
|
|
|
|
unsigned char
|
|
checksum_xor_uint8 (const unsigned char data[], unsigned int size, unsigned char init);
|
|
|
|
unsigned short
|
|
checksum_crc_ccitt_uint16 (const unsigned char data[], unsigned int size);
|
|
|
|
unsigned int
|
|
checksum_crc32 (const unsigned char data[], unsigned int size);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif /* __cplusplus */
|
|
|
|
#endif /* CHECKSUM_H */
|