spi_device_acquire_bus() function

The device to occupy the bus.

Time to wait before the the bus is occupied by the device. Currently MUST set to portMAX_DELAY.

Send a polling transaction, wait for it to complete, and return the result This function is the equivalent of calling spi_device_polling_start() followed by spi_device_polling_end(). Do not use this when there is still a transaction that hasn't been finalized.

Send a SPI transaction, wait for it to complete, and return the result This function is the equivalent of calling spi_device_queue_trans() followed by spi_device_get_trans_result(). Do not use this when there is still a transaction separately queued (started) from spi_device_queue_trans() or polling_start/transmit that hasn't been finalized.

Remove a device from the SPI bus

Allocate a device on a SPI bus This initializes the internal structures for a device, plus allocates a CS pin on the indicated SPI master peripheral and routes it to the indicated GPIO. All SPI master devices have three CS pins and can thus control up to three devices. There's no notable delay on chips other than ESP32.

Calculate working frequency for specific device

Release the SPI bus occupied by the device. All other devices can start sending transactions.

Get the result of a SPI transaction queued earlier by ``spi_device_queue_trans``. This routine will wait until a transaction to the given device 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.

Queue a SPI transaction for interrupt transaction execution. Get the result by ``spi_device_get_trans_result``.

Immediately start a polling transaction.

Poll until the polling transaction ends. This routine will not return until the transaction to the given device has successfully completed. The task is not blocked, but actively busy-spins for the transaction to be completed.