SPI finish interrupt is not working under DMA mode // Batch Async SPI Transfers with Bulk Data Exhibit Unreliable Behavior

[andelf]

It seems that Future returns before the SPI transfer has finished.

Only occurs when bulk data is transferred under slow SPI frequency.

UPDATE:

SPI finish interrupt is not working under DMA mode.

[andelf]

Bug in async fn transfer_inner(). DMA finish is awaited. No RX/TX finish signal is awaited.

[andelf]

Added busy-loop waiting to address the issue. This issue will remain open to document the hardware behavior.