handle_spi_setup_done() function

Queue a SPI transaction for execution Queues a SPI transaction to be executed by this slave device. (The transaction queue size was specified when the slave device was initialised via spi_slave_initialize.) This function may block if the queue is full (depending on the ticks_to_wait parameter). No SPI operation is directly initiated by this function, the next queued transaction will happen when the master initiates a SPI transaction by pulling down CS and sending out clock signals. This function hands over ownership of the buffers in ``trans_desc`` to the SPI slave driver; the application is not to access this memory until ``spi_slave_queue_trans`` is called to hand ownership back to the application.

Queue a SPI transaction in ISR If you use both ``spi_slave_queue_trans`` and ``spi_slave_queue_trans_isr`` simultaneously to transfer valid data, you should deal with concurrency issues on your self risk

Get the result of a SPI transaction queued earlier This routine will wait until a transaction to the given device (queued earlier with spi_slave_queue_trans) has successfully completed. It will then return the description of the completed transaction so software can inspect the result and e.g. free the memory or reuse the buffers. It is mandatory to eventually use this function for any transaction queued by ``spi_slave_queue_trans``.

Do a SPI transaction Essentially does the same as spi_slave_queue_trans followed by spi_slave_get_trans_result. Do not use this when there is still a transaction queued that hasn't been finalized using spi_slave_get_trans_result.