81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
#ifndef _I2C_H
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#define _I2C_H
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#include "config_wrapper.h"
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#ifdef I2C
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// Uncomment if we act as master device.
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#define I2C_MASTER_MODE
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// Uncomment if we act as slave device.
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//#define I2C_SLAVE_MODE
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// Uncomment if we use EEPROM chips.
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//#define I2C_EEPROM_SUPPORT
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#define I2C_BITRATE 100000
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#define I2C_PORT PORTC
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#define I2C_DDR DDRC
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#define I2C_SCL_PIN 0
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#define I2C_SDA_PIN 1
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#define I2C_ENABLE_PULLUPS
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#define I2C_BUFFER_SIZE 4
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#ifdef I2C_EEPROM_SUPPORT
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// Depends on EEPROM type, usually it is 1 or 2 bytes.
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#define I2C_PAGE_ADDRESS_SIZE 2
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#endif /* I2C_EEPROM_SUPPORT */
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#ifdef I2C_SLAVE_MODE
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#define I2C_SLAVE_RX_BUFFER_SIZE 1
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#define I2C_SLAVE_TX_BUFFER_SIZE 1
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#endif /* I2C_SLAVE_MODE */
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#ifdef I2C_SLAVE_MODE
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#define I2C_MODE 1
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#else
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#define I2C_MODE 0
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#endif
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#define I2C_MODE_MASK 0b00001100
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#define I2C_MODE_SARP 0b00000000 // Start-Addr_R-Read-Stop: just read mode
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#define I2C_MODE_SAWP 0b00000100 // Start-Addr_W-Write-Stop: just write mode
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#define I2C_MODE_ENHA 0b00001000 // Start-Addr_W-WrPageAdr-rStart-Addr_R-Read-Stop
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#define I2C_MODE_BUSY 0b01000000 // Transponder is busy
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#define I2C_MODE_FREE 0b10111111 // Transponder is free
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// Transmission interrupted.
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#define I2C_INTERRUPTED 0b10000000
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// Transmission not interrupted.
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#define I2C_NOINTERRUPTED 0b01111111
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#define I2C_ERROR_BUS_FAIL 0b00000001
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#define I2C_ERROR_NACK 0b00000010
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#define I2C_ERROR_NO_ANSWER 0b00010000
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#define I2C_ERROR_LOW_PRIO 0b00100000
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#define MACRO_I2C_ERROR (i2c_error_func)()
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#ifdef I2C_SLAVE_MODE
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#define MACRO_I2C_SLAVE (i2c_slave_func)()
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#else
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#define MACRO_I2C_MASTER (i2c_master_func)()
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#endif /* I2C_SLAVE_MODE */
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typedef void (*I2C_HANDLER)(void);
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extern I2C_HANDLER i2c_error_func;
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#ifdef I2C_SLAVE_MODE
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extern I2C_HANDLER i2c_slave_func;
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#else
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extern I2C_HANDLER i2c_master_func;
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#endif /* I2C_SLAVE_MODE */
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void i2c_init(uint8_t address, I2C_HANDLER func);
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void i2c_send(uint8_t address, uint8_t* block, uint8_t tx_len);
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void i2c_do_nothing(void);
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#endif /* I2C */
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#endif /* _I2C_H */
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