kopia lustrzana https://github.com/conorpp/u2f-zero
78 wiersze
1.8 KiB
C
78 wiersze
1.8 KiB
C
/*
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* i2c.h
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*
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* Created on: Feb 14, 2016
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* Author: Conor
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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 errors;
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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 struct smb_interrupt_interface SMB;
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extern 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_COMPUTE_CRC 0x20
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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_HAS_CRC() (SMB_FLAGS & SMB_COMPUTE_CRC)
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#define SMB_CRC_CLEAR() (SMB_FLAGS &= ~SMB_COMPUTE_CRC)
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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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void smb_init_crc();
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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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