19.8.1.3.2 Workflow

  1. Select slave. 
    spi_select_slave(&spi_master_instance, &slave, true);
  2. Write buffer to SPI slave. 
    spi_write_buffer_wait(&spi_master_instance, buffer, BUF_LENGTH);
  3. Deselect slave. 
    spi_select_slave(&spi_master_instance, &slave, false);
  4. Light up. 
    port_pin_set_output_level(LED_0_PIN, LED0_ACTIVE);
  5. Infinite loop. 
    while (true) {
    /* Infinite loop */
    if(!port_pin_get_input_level(BUTTON_0_PIN)) {
        spi_select_slave(&spi_master_instance, &slave, true);
        spi_write_buffer_wait(&spi_master_instance, buffer, BUF_LENGTH);
        spi_select_slave(&spi_master_instance, &slave, false);
        port_pin_set_output_level(LED_0_PIN, LED0_ACTIVE);
    }
}