dc570b0b |
1 | #pragma once |
2 | |
3 | #include <stdint.h> |
4 | |
5 | #ifndef F_CPU |
6 | #define F_CPU 16000000UL |
7 | #endif |
8 | |
9 | #define I2C_READ 1 |
10 | #define I2C_WRITE 0 |
11 | |
12 | #define I2C_ACK 1 |
13 | #define I2C_NACK 0 |
14 | |
15 | #define SLAVE_BUFFER_SIZE 0x10 |
16 | |
17 | // i2c SCL clock frequency 400kHz |
18 | #define SCL_CLOCK 400000L |
19 | |
20 | extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE]; |
21 | |
22 | void i2c_master_init(void); |
23 | uint8_t i2c_master_start(uint8_t address); |
24 | void i2c_master_stop(void); |
25 | uint8_t i2c_master_write(uint8_t data); |
26 | uint8_t i2c_master_read(int); |
27 | void i2c_reset_state(void); |
28 | void i2c_slave_init(uint8_t address); |
29 | |
30 | |
31 | static inline unsigned char i2c_start_read(unsigned char addr) { |
32 | return i2c_master_start((addr << 1) | I2C_READ); |
33 | } |
34 | |
35 | static inline unsigned char i2c_start_write(unsigned char addr) { |
36 | return i2c_master_start((addr << 1) | I2C_WRITE); |
37 | } |
38 | |
39 | // from SSD1306 scrips |
40 | extern unsigned char i2c_rep_start(unsigned char addr); |
41 | extern void i2c_start_wait(unsigned char addr); |
42 | extern unsigned char i2c_readAck(void); |
43 | extern unsigned char i2c_readNak(void); |
44 | extern unsigned char i2c_read(unsigned char ack); |
45 | |
46 | #define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak(); |