61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
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#ifndef I2C_H
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#define I2C_H
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#include <stdint.h>
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#ifndef F_CPU
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#define F_CPU 16000000UL
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#endif
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#define I2C_READ 1
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#define I2C_WRITE 0
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#define I2C_ACK 1
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#define I2C_NACK 0
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// Address location defines (Keymap should be last, as it's size is dynamic)
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#define I2C_BACKLIT_START 0x00
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// Need 4 bytes for RGB (32 bit)
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#define I2C_RGB_START 0x01
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#define I2C_KEYMAP_START 0x06
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// Slave buffer (8bit per)
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// Rows per hand + backlit space + rgb space
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// TODO : Make this dynamically sized
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#define SLAVE_BUFFER_SIZE 0x20
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// i2c SCL clock frequency
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#define SCL_CLOCK 400000L
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// Support 8bits right now (8 cols) will need to edit to take higher (code exists in delta split?)
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extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
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void i2c_master_init(void);
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uint8_t i2c_master_start(uint8_t address);
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void i2c_master_stop(void);
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uint8_t i2c_master_write(uint8_t data);
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uint8_t i2c_master_write_data(void *const TXdata, uint8_t dataLen);
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uint8_t i2c_master_read(int);
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void i2c_reset_state(void);
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void i2c_slave_init(uint8_t address);
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static inline unsigned char i2c_start_read(unsigned char addr) {
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return i2c_master_start((addr << 1) | I2C_READ);
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}
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static inline unsigned char i2c_start_write(unsigned char addr) {
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return i2c_master_start((addr << 1) | I2C_WRITE);
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}
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// from SSD1306 scrips
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extern unsigned char i2c_rep_start(unsigned char addr);
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extern void i2c_start_wait(unsigned char addr);
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extern unsigned char i2c_readAck(void);
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extern unsigned char i2c_readNak(void);
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extern unsigned char i2c_read(unsigned char ack);
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#define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak();
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#endif
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