Latency of ReadFile in CE6

Technical Support
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21

The IOCTLs supported by the Serial Port Driver are listed here, but there is no IOCTL for reading the buffer directly. To read the UART buffer directly, a custom driver would need to be developed.

22

You can try to disable DMA:

[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\UARTx]
"EnableDMA"=dword:0

23

That didn’t make a difference unfortunately.

Here is a scope of the latency:

Tek000
Tek0001280×800 83.3 KB

24

Actually, disabling DMA did work. I just needed to reboot the Colibri. Problem solved!!!

25

Thanks Alex!