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author | Danny Nguyen <[email protected]> | 2017-05-29 15:37:19 -0400 |
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committer | Danny Nguyen <[email protected]> | 2017-05-29 16:04:46 -0400 |
commit | aeade1b1972c8d3d8f32dd21e1ae31e6c9e702db (patch) | |
tree | a62c87b595c110615efd214666dd6f5b419d1c0e /keyboards/nyquist/i2c.h | |
parent | 732a115b32a9c6aa529c53ef52a9689b5901411d (diff) | |
download | qmk_firmware-aeade1b1972c8d3d8f32dd21e1ae31e6c9e702db.tar.gz qmk_firmware-aeade1b1972c8d3d8f32dd21e1ae31e6c9e702db.zip |
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Diffstat (limited to 'keyboards/nyquist/i2c.h')
-rw-r--r-- | keyboards/nyquist/i2c.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/keyboards/nyquist/i2c.h b/keyboards/nyquist/i2c.h new file mode 100644 index 0000000000..c15b6bc506 --- /dev/null +++ b/keyboards/nyquist/i2c.h @@ -0,0 +1,49 @@ +#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 400000L + +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 |