cc6db9c5 |
1 | #ifndef I2C_H |
2 | #define I2C_H |
3 | |
4 | #include <stdint.h> |
5 | |
6 | #ifndef F_CPU |
7 | #define F_CPU 16000000UL |
8 | #endif |
9 | |
10 | #define I2C_READ 1 |
11 | #define I2C_WRITE 0 |
12 | |
13 | #define I2C_ACK 1 |
14 | #define I2C_NACK 0 |
15 | |
16 | #define SLAVE_BUFFER_SIZE 0x10 |
17 | |
18 | // i2c SCL clock frequency |
19 | #define SCL_CLOCK 800000L |
20 | |
21 | extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE]; |
22 | |
23 | void i2c_master_init(void); |
24 | uint8_t i2c_master_start(uint8_t address); |
25 | void i2c_master_stop(void); |
26 | uint8_t i2c_master_write(uint8_t data); |
27 | uint8_t i2c_master_read(int); |
28 | void i2c_reset_state(void); |
29 | void i2c_slave_init(uint8_t address); |
30 | |
31 | |
32 | static inline unsigned char i2c_start_read(unsigned char addr) { |
33 | return i2c_master_start((addr << 1) | I2C_READ); |
34 | } |
35 | |
36 | static inline unsigned char i2c_start_write(unsigned char addr) { |
37 | return i2c_master_start((addr << 1) | I2C_WRITE); |
38 | } |
39 | |
40 | // from SSD1306 scrips |
41 | extern unsigned char i2c_rep_start(unsigned char addr); |
42 | extern void i2c_start_wait(unsigned char addr); |
43 | extern unsigned char i2c_readAck(void); |
44 | extern unsigned char i2c_readNak(void); |
45 | extern unsigned char i2c_read(unsigned char ack); |
46 | |
47 | #define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak(); |
48 | |
49 | #endif |