MSC Device: Add asynchronous IO support #2967
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Signed-off-by: HiFiPhile <[email protected]>
Signed-off-by: HiFiPhile <[email protected]>
Signed-off-by: HiFiPhile <[email protected]>
Signed-off-by: HiFiPhile <[email protected]>
Signed-off-by: HiFiPhile <[email protected]>
Signed-off-by: HiFiPhile <[email protected]>
Signed-off-by: HiFiPhile <[email protected]>
Signed-off-by: HiFiPhile <[email protected]>
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Describe the PR
Currently, mixing the MSC class with other classes could be problematic since IO operations could block
tud_task()for a long time and degrade real-time performance, especially for isochronous and interrupt transfer-based classes.Now, it's possible to delegate IO operations to a background task.
The
cdc_msc_freertosexample has been updated for demonstration. One can changeCFG_EXAMPLE_MSC_IO_DELAY_MSto a high value and type in the console while doing disk IO. WithCFG_EXAMPLE_MSC_ASYNC_IOON and OFF, the latency difference should be very noticeable.