48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
#ifndef _I2C_H
|
|
#define _I2C_H
|
|
|
|
#include "config_wrapper.h"
|
|
|
|
#ifdef I2C
|
|
|
|
// Uncomment if we act as master device.
|
|
#define I2C_MASTER_MODE
|
|
// Uncomment if we act as slave device.
|
|
//#define I2C_SLAVE_MODE
|
|
// Uncomment if we use EEPROM chips.
|
|
//#define I2C_EEPROM_SUPPORT
|
|
|
|
// Bus speed. Maximum is said to be 400000.
|
|
#define I2C_BITRATE 100000
|
|
// Comment out if there are external pullups.
|
|
#define I2C_ENABLE_PULLUPS
|
|
|
|
/** \def I2C_BUFFER_SIZE
|
|
|
|
Size of send buffer. MUST be a \f$2^n\f$ value, maximum is 512.
|
|
|
|
A larger buffer allows to store more display data immediately, so it can
|
|
speed operations up. An exhaused buffer doesn't mean data gets lost, writing
|
|
to the buffer then waits until sufficient previous data is sent.
|
|
*/
|
|
#define I2C_BUFFER_SIZE 128
|
|
|
|
#ifdef I2C_SLAVE_MODE
|
|
#define I2C_SLAVE_RX_BUFFER_SIZE 1
|
|
#define I2C_SLAVE_TX_BUFFER_SIZE 1
|
|
#endif /* I2C_SLAVE_MODE */
|
|
|
|
#ifdef I2C_EEPROM_SUPPORT
|
|
// Depends on EEPROM type, usually it is 1 or 2 bytes.
|
|
#define I2C_PAGE_ADDRESS_SIZE 2
|
|
#endif /* I2C_EEPROM_SUPPORT */
|
|
|
|
|
|
void i2c_init(uint8_t address);
|
|
uint8_t i2c_busy(void);
|
|
void i2c_write(uint8_t address, uint8_t data, uint8_t last_byte);
|
|
|
|
#endif /* I2C */
|
|
|
|
#endif /* _I2C_H */
|