for standard operation
This example configures the FreeRTOS SPI driver to:
Other FreeRTOS tasks will execute during any wait periods.
If the driver is initialized with this configuration then only the freertos_spi_write_packet() and freertos_spi_read_packet() API functions can be used to transmit and receive data respectively. freertos_spi_write_packet_async() and freertos_spi_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.