i2c-avr-c

i2c communication with minimal functions in C

Good for starters and experts. This library can handle everithing.

Initialising the I2C :

• bitrate -bitrate of the communication;
• prescale -prescaler of the clk;
• bitrate, prescale i2c_init(400,0); i2c_init(100,1);

void i2c_init(uint16_t bitrate, uint8_t prescale);

Setting and calculating the I2C bitrate:

• bitrateKHz -bitrate of the communication;
• bitrateKHz i2c_set_bitrate(400); i2c_set_bitrate(100);

void i2c_set_bitrate(uint16_t bitrateKHz);

Starting the communication:

• void i2c_start(void);

Stopping the communication:

• void i2c_stop(void);

Writing to the bus:

• void i2c_write(uint8_t data);

Reading a acknowledgement:

• Afte reading the ack packet the I2C is not going to be stopd;

uint8_t i2c_read_ack(void);

Reading a not acknowledgement:

• Afte reading the nack packet the I2C is stopped with the void i2c_stop(void) function;

uint8_t i2c_read_nack(void);

Reading I2C status register:

• Returns the status regiszter data;

uint8_t i2c_status(void);

Automaticali writing 1 byte of data to register:

• add -address of the senzor;
• reg -register of the senzor that you want to read;
• val -value that is being writen;

void i2c_write_reg(uint8_t add, uint8_t reg, uint8_t val);

Automaticaly reading 1 bytes from the specified register:

• add -address of the senzor;
• reg -register of the senzor that you want to read;

uint8_t i2c_read_reg8(uint8_t add, uint8_t reg);

Automaticaly reading 2 bytes from the specified register:

• add -address of the senzor;
• reg -register of the senzor that you want to read;

uint16_t i2c_read_reg16(uint8_t add, uint8_t reg);

Cheking the bit in the readed register:

• add -address of the senzor;
• reg -register of the senzor that you want to read;
• bit -the bit that you want to check;

uint8_t i2c_bit_check(uint8_t add, uint8_t reg, uint8_t bit);

Reading register to buffer:

• add -address of the senzor;
• reg -register of the senzor that you want to read;
• buf -free space for data;
• size -size of the readed data;

void i2c_read_reg_to_buf(uint8_t add, uint8_t reg, uint8_t *buf, uint8_t size);

Simple finction to write outh I2C addresses:

• i2c_scann - true if you want to scan for addresses;

• i2c_add_shifting -true if you want to shift the I2C addres;

• The address shifting is a necesery must to communikate with the senzors or what ever you put on the I2C bus.

• YOU WILL NEED printf function

void i2c_get_adreses(uint8_t i2c_scann, uint8_t i2c_add_shifting);