I2C driver for EEPROM on ESP32

Simple driver for work with EEPROM on ESP32 according to the I2C protocol

Constants

• I2C_MASTER_SCL_IO

    GPIO for SCL
  

• I2C_MASTER_SDA_IO

    GPIO for SDA
  

• I2C_MASTER_NUM

    I2C port
  

• I2C_MASTER_TX_BUF_DISABLE

    TX buffer disable(0)/enable(1)
  

• I2C_MASTER_RX_BUF_DISABLE

    RX buffer disable(0)/enable(1)
  

• I2C_MASTER_FREQ_HZ

    Clock frequency
  

• PULLUP_SCL_GPIO

    Enable pull-up on SCL GPIO
  

• PULLUP_SDA_GPIO

    Enable pull-up on SDA GPIO
  

• ACK_CHECK_EN

    Check ACK from EEPROM
  

• ACK_CHECK_DIS

    Don't check ACK from EEPROM
  

• ACK_VAL

    ACK value
  

• NACK_VAL

    NACK value
  

• EEPROM_WRITE_ADDR

    Write bit for EEPROM
  

• EEPROM_READ_ADDR

    Read bit for EEPROM
  

• EEPROM_PAGE_SIZE

    Page size of EEPROM
  

Provided functions

• esp_err_t init_i2c_master()

    I2C master initialization with PULLUP_`X`_GPIO pull-up on GPIOs I2C_MASTER_SDA_IO and I2C_MASTER_SCL_IO with I2C_MASTER_FREQ_HZ frequency on I2C_MODE_MASTER
  
    Return ESP_OK or error
  

• esp_err_t eeprom_write_byte(uint8_t deviceaddress, uint16_t eeaddress, uint8_t byte)

    Write one byte to EEPROM
    
    * deviceaddress - EEPROM address
    * eeaddress - address on EEPROM where byte will be write
    * byte - byte for write
  
    Write schema in I2C:
    ___________________________________________________________________________________________________________
    | start | slave_addr + wr_bit + ack | high_byte_aadr + ack | low_byte_addr + ack | data_byte + ack | stop |
    |-------|---------------------------|----------------------|---------------------|-----------------|------|
  
    Return ESP_OK or error
  

• esp_err_t eeprom_write(uint8_t deviceaddress, uint16_t eeaddress, uint8_t *data, size_t size)

    Write a few bytes to EEPROM
  
    * deviceaddress - EEPROM address
    * eeaddress - address on EEPROM where bytes will be write 
    * data - bytes for write
    * size - size of data
  
    Write schema in I2C:
    _______________________________________________________________________________________________________________________________________
    | start | slave_addr + wr_bit + ack | high_byte_aadr + ack | low_byte_addr + ack | data_byte_0 + ack | ... | data_byte_x + ack | stop |
    |-------|---------------------------|----------------------|---------------------|------------------|-----|--------------------|------|
  
    Return ESP_OK or error
  

• esp_err_t eeprom_read_byte(uint8_t deviceaddress, uint16_t eeaddress, uint8_t *byte)

    Read random byte from EEPROM
  
    * deviceaddress - EEPROM address
    * eeaddress - EEPROM address from which the byte will be read
    * byte - var into which byte will be read
  
    Read schema in I2C:
    __________________________________________________________________________________________________________________________________________________
    | start | slave_addr + wr_bit + ack | high_byte_addr + ack | low_byte_addr + ack | start | slave_addr + rd_bit + ack | read 1 byte + nack | stop |
    |-------|---------------------------|----------------------|---------------------|-------|---------------------------|--------------------|------|
  
    Return ESP_OK or error
  

• esp_err_t eeprom_read(uint8_t deviceaddress, uint16_t eeaddress, uint8_t *data, size_t size)

    Read byte sequential from EEPROM
  
    * deviceaddress - EEPROM address
    * eeaddress - EEPROM address from which the bytes will be read
    * data - var into which bytes will be read
    
    Read schema in I2C:
  
    ____________________________________________________________________________________________________________________________________________________________________________
    | start | slave_addr + wr_bit + ack | high_byte_addr + ack | low_byte_addr + ack | start | slave_addr + rd_bit + ack | read byte_1 + ack | ... | read byte_x + nack | stop |
    |-------|---------------------------|----------------------|---------------------|-------|---------------------------|-------------------|-----|--------------------|------|
  
    Return ESP_OK or error