48 lines
1.2 KiB
C
48 lines
1.2 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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// Bus speed. Maximum is said to be 400000.
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#define I2C_BITRATE 100000
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// Comment out if there are external pullups.
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#define I2C_ENABLE_PULLUPS
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/** \def I2C_BUFFER_SIZE
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Size of send buffer. MUST be a \f$2^n\f$ value, maximum is 512.
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A larger buffer allows to store more display data immediately, so it can
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speed operations up. An exhaused buffer doesn't mean data gets lost, writing
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to the buffer then waits until sufficient previous data is sent.
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*/
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#define I2C_BUFFER_SIZE 128
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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_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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void i2c_init(uint8_t address);
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uint8_t i2c_busy(void);
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void i2c_write(uint8_t data, uint8_t last_byte);
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#endif /* I2C */
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#endif /* _I2C_H */
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