17.8.1.2.1 Code

A sample buffer to send, a sample buffer to read:

#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];

Slave address to access:

#define SLAVE_ADDRESS 0x12

Number of times to try to send packet if it fails:

#define TIMEOUT 1000

Globally accessible module structure:

struct i2c_master_module i2c_master_instance;

Function for setting up the module:

void configure_i2c_master(void)
{
    /* Initialize config structure and software module. */
    struct i2c_master_config config_i2c_master;
    i2c_master_get_config_defaults(&config_i2c_master);

    /* Change buffer timeout to something longer. */
    config_i2c_master.buffer_timeout = 10000;

    /* Initialize and enable device with config. */
    i2c_master_init(&i2c_master_instance, CONF_I2C_MASTER_MODULE, &config_i2c_master);

    i2c_master_enable(&i2c_master_instance);
}

Add to user application main():

/* Configure device and enable. */
configure_i2c_master();

/* Timeout counter. */
uint16_t timeout = 0;

/* Init i2c packet. */
struct i2c_master_packet packet = {
    .address     = SLAVE_ADDRESS,
    .data_length = DATA_LENGTH,
    .data        = write_buffer,
    .ten_bit_address = false,
    .high_speed      = false,
    .hs_master_code  = 0x0,
};