5 #include "split_util.h"
8 #define F_CPU 16000000UL
17 #define SLAVE_BUFFER_SIZE 0x10
19 // i2c SCL clock frequency
20 #define SCL_CLOCK 400000L
22 extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
24 void i2c_master_init(void);
25 uint8_t i2c_master_start(uint8_t address);
26 void i2c_master_stop(void);
27 uint8_t i2c_master_write(uint8_t data);
28 uint8_t i2c_master_read(int);
29 void i2c_reset_state(void);
30 void i2c_slave_init(uint8_t address);
33 static inline unsigned char i2c_start_read(unsigned char addr) {
34 return i2c_master_start((addr << 1) | I2C_READ);
37 static inline unsigned char i2c_start_write(unsigned char addr) {
38 return i2c_master_start((addr << 1) | I2C_WRITE);
41 // from SSD1306 scrips
42 extern unsigned char i2c_rep_start(unsigned char addr);
43 extern void i2c_start_wait(unsigned char addr);
44 extern unsigned char i2c_readAck(void);
45 extern unsigned char i2c_readNak(void);
46 extern unsigned char i2c_read(unsigned char ack);
48 #define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak();