kopia lustrzana https://github.com/conorpp/u2f-zero
104 wiersze
3.3 KiB
C
104 wiersze
3.3 KiB
C
/*
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* Copyright (c) 2016, Conor Patrick
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef I2C_H_
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#define I2C_H_
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struct smb_interrupt_interface
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{
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uint8_t addr;
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uint16_t crc;
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uint8_t crc_offset;
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uint8_t* write_buf;
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uint8_t write_len;
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uint8_t write_offset;
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uint8_t read_len;
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uint8_t read_offset;
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uint8_t* read_buf;
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uint8_t* write_ext_buf;
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uint8_t write_ext_len;
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uint8_t write_ext_offset;
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uint8_t preflags;
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};
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extern data uint8_t SMB_addr;
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extern uint8_t * SMB_write_buf;
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extern data uint8_t SMB_write_len;
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extern data uint8_t SMB_write_offset;
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extern data uint8_t SMB_read_len;
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extern data uint8_t SMB_read_offset;
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extern uint8_t * SMB_read_buf;
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extern uint8_t * SMB_write_ext_buf;
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extern data uint8_t SMB_write_ext_len;
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extern data uint8_t SMB_write_ext_offset;
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extern uint8_t SMB_preflags;
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extern uint16_t SMB_crc;
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extern data uint8_t SMB_crc_offset;
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//extern struct smb_interrupt_interface SMB;
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extern data volatile uint8_t SMB_FLAGS;
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#define SMB_MAX_ERRORS 15
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#define SMB_ERRORS_EXCEEDED(inter) ((inter)->errors > SMB_MAX_ERRORS)
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#define SMB_WRITE 0x0
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#define SMB_READ 0x1
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#define SMB_BUSY 0x2
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#define SMB_WRITE_EXT 0x4
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#define SMB_READ_TRUNC 0x10
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#define SMB_RECV_NACK 0x40
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#define SMB_READING() ((SMB_FLAGS & SMB_READ))
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#define SMB_WRITING() (!(SMB_FLAGS & SMB_READ))
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#define SMB_WRITING_EXT() ((SMB_FLAGS & SMB_WRITE_EXT))
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#define SMB_IS_BUSY() ((SMB_FLAGS & SMB_BUSY))
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#define SMB_BUSY_CLEAR() (SMB_FLAGS &= ~SMB_BUSY)
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#define SMB_WAS_NACKED() (SMB_FLAGS & SMB_RECV_NACK)
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void smb_init();
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// read from I2C device, returns number of bytes read.
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// sets truncated flag if it had to stop because count wasn't
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// large enough
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uint8_t smb_read (uint8_t addr, uint8_t* dest, uint8_t count);
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// write to I2C device
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void smb_write (uint8_t addr, uint8_t* buf, uint8_t len);
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void smb_set_ext_write( uint8_t* extbuf, uint8_t extlen);
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// reverse bits for a 16 bit int
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uint16_t reverse_bits(uint16_t crc);
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// does a crc on byte @b and accumulates it to crc @crc
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uint16_t feed_crc(uint16_t crc, uint8_t b);
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#endif /* I2C_H_ */
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