18.8.2.2.1 Code

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

#define DATA_LENGTH 10
static uint8_t write_buffer[DATA_LENGTH] = {
        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
};
static 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;

Globally accessible packet:

static struct i2c_slave_packet packet;

Function for setting up the module:

void configure_i2c_slave(void)
{
    /* Initialize config structure and module instance */
    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;
    /* Initialize and enable device with config */
    i2c_slave_init(&i2c_slave_instance, CONF_I2C_SLAVE_MODULE, &config_i2c_slave);

    i2c_slave_enable(&i2c_slave_instance);
}

Callback function for read request from a master:

void i2c_read_request_callback(
        struct i2c_slave_module *const module)
{
    /* Init i2c packet */
    packet.data_length = DATA_LENGTH;
    packet.data        = write_buffer;

    /* Write buffer to master */
    i2c_slave_write_packet_job(module, &packet);
}

Callback function for write request from a master:

void i2c_write_request_callback(
        struct i2c_slave_module *const module)
{
    /* Init i2c packet */
    packet.data_length = DATA_LENGTH;
    packet.data        = read_buffer;

    /* Read buffer from master */
    if (i2c_slave_read_packet_job(module, &packet) != STATUS_OK) {
    }
}

Function for setting up the callback functionality of the driver:

void configure_i2c_slave_callbacks(void)
{
    /* Register and enable callback functions */
    i2c_slave_register_callback(&i2c_slave_instance, i2c_read_request_callback,
            I2C_SLAVE_CALLBACK_READ_REQUEST);
    i2c_slave_enable_callback(&i2c_slave_instance,
            I2C_SLAVE_CALLBACK_READ_REQUEST);

    i2c_slave_register_callback(&i2c_slave_instance, i2c_write_request_callback,
            I2C_SLAVE_CALLBACK_WRITE_REQUEST);
    i2c_slave_enable_callback(&i2c_slave_instance,
            I2C_SLAVE_CALLBACK_WRITE_REQUEST);
}

Add to user application main():

/* Configure device and enable */
configure_i2c_slave();
configure_i2c_slave_callbacks();