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converter/usb_usb Refactor and Configurator support (#4345)
[qmk_firmware.git] / keyboards / fourier / i2c.h
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  400000L
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