Function esp_idf_svc::sys::spi_device_polling_start

pub unsafe extern "C" fn spi_device_polling_start(
    handle: *mut spi_device_t,
    trans_desc: *mut spi_transaction_t,
    ticks_to_wait: u32,
) -> i32

@brief Immediately start a polling transaction.

@note Normally a device cannot start (queue) polling and interrupt transactions simutanuously. Moreover, a device cannot start a new polling transaction if another polling transaction is not finished.

@param handle Device handle obtained using spi_host_add_dev @param trans_desc Description of transaction to execute @param ticks_to_wait Ticks to wait until there’s room in the queue; currently only portMAX_DELAY is supported.

@return - ESP_ERR_INVALID_ARG if parameter is invalid. This can happen if SPI_TRANS_CS_KEEP_ACTIVE flag is specified while the bus was not acquired (spi_device_acquire_bus() should be called first) or set flag SPI_TRANS_DMA_BUFFER_ALIGN_MANUAL but tx or rx buffer not DMA-capable, or addr&len not align to cache line size - ESP_ERR_TIMEOUT if the device cannot get control of the bus before ticks_to_wait expired - ESP_ERR_NO_MEM if allocating DMA-capable temporary buffer failed - ESP_ERR_INVALID_STATE if previous transactions are not finished - ESP_OK on success