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Serial Port RX fails on WC 2013


Create a program to write from one serial port and read to another (or read/write the same serial port using a loopback cable), eventually the read will fail.

Using the Timeline Kernel debugger, the SysInt for RX is clearly being raised, and then handled by the mdd's SerialDispatchThread function

while (alive)
Wait(hSerialEvent, INFINITE)

The issue stems when a SysInt0 or SysInt1 is raised within 5us after the RX SysInt.
When this occurs, the hSerialEvent is never raised.

By changing the Wait to timeout (in the Mdd:SerialDispatchThread), and allowing it to call the InterruptDone method, the next RX SysInt event will then correctly get raised and handled.

Any help/ideas to what may be going wrong?


dvescovi wrote Oct 16, 2014 at 11:14 AM

This appears to only be an issue with the WEC2013 unreleased code and NOT the WEC7 code posted here.

dvescovi wrote May 1, 2015 at 9:28 PM

This was a Microsoft issue and is now resolved by installing the latest QFE's.