for standard operation
This example configures the FreeRTOS TWI driver to:
Other FreeRTOS tasks will execute during any wait periods.
If the driver is initialized with this configuration then only the freertos_twi_write_packet() and freertos_twi_read_packet() API functions can be used to transmit and receive data respectively. freertos_twi_write_packet_async() and freertos_twi_read_packet_async() must not be used.
Refer to the FreeRTOS peripheral control projects in the Atmel ASF distribution for complete working examples, and the FreeRTOS web site for information on getting started with FreeRTOS.