18.8.1.2.1 Code

A sample buffer to write from, a sample buffer to read to and length of buffers:

#define DATA_LENGTH 10

uint8_t write_buffer[DATA_LENGTH] = {
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09
};
uint8_t read_buffer[DATA_LENGTH];

Address to respond to:

#define SLAVE_ADDRESS 0x12

Globally accessible module structure:

struct i2c_slave_module i2c_slave_instance;

Function for setting up the module:

void configure_i2c_slave(void)
{
    /* Create and initialize config_i2c_slave structure */
    struct i2c_slave_config config_i2c_slave;
    i2c_slave_get_config_defaults(&config_i2c_slave);

    /* Change address and address_mode */
    config_i2c_slave.address        = SLAVE_ADDRESS;
    config_i2c_slave.address_mode   = I2C_SLAVE_ADDRESS_MODE_MASK;
    config_i2c_slave.buffer_timeout = 1000;

    /* Initialize and enable device with config_i2c_slave */
    i2c_slave_init(&i2c_slave_instance, CONF_I2C_SLAVE_MODULE, &config_i2c_slave);

    i2c_slave_enable(&i2c_slave_instance);
}

Add to user application main():

configure_i2c_slave();

enum i2c_slave_direction dir;
struct i2c_slave_packet packet = {
    .data_length = DATA_LENGTH,
    .data        = write_buffer,
};