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- #ifndef I2C_H
- #define I2C_H
-
- #include <stdint.h>
-
- #ifndef F_CPU
- #define F_CPU 16000000UL
- #endif
-
- #define I2C_READ 1
- #define I2C_WRITE 0
-
- #define I2C_ACK 1
- #define I2C_NACK 0
-
- #define SLAVE_BUFFER_SIZE 0x10
-
- // i2c SCL clock frequency
- #define SCL_CLOCK 800000L
-
- extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
-
- void i2c_master_init(void);
- uint8_t i2c_master_start(uint8_t address);
- void i2c_master_stop(void);
- uint8_t i2c_master_write(uint8_t data);
- uint8_t i2c_master_read(int);
- void i2c_reset_state(void);
- void i2c_slave_init(uint8_t address);
-
-
- static inline unsigned char i2c_start_read(unsigned char addr) {
- return i2c_master_start((addr << 1) | I2C_READ);
- }
-
- static inline unsigned char i2c_start_write(unsigned char addr) {
- return i2c_master_start((addr << 1) | I2C_WRITE);
- }
-
- // from SSD1306 scrips
- extern unsigned char i2c_rep_start(unsigned char addr);
- extern void i2c_start_wait(unsigned char addr);
- extern unsigned char i2c_readAck(void);
- extern unsigned char i2c_readNak(void);
- extern unsigned char i2c_read(unsigned char ack);
-
- #define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak();
-
- #endif
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