RE: Do Not Hide the Problem - A Correct SW Lab 7 Solution

aspork42 — Fri, 08 Nov 2019 22:39:14 GMT

Great write up - I just found this last night. The part that worried me about it is that running this test disables the fan. The processor then deadlocks and turns into a little heater.

I ended up with the error messages shown here:

Temperature Alarm(0) HIGH Threshold is 52.700 Centigrade.
Temperature Alarm(0) LOW Threshold is 42.698 Centigrade.
VCCINT Alarm(1) HIGH Threshold is 0.637 Volts.
VCCINT Alarm(1) LOW Threshold is 1.037 Volts.
VCCAUX Alarm(3) HIGH Threshold is 1.597 Volts.
VCCAUX Alarm(3) LOW Threshold is 1.997 Volts.

Alarm 0 - Temperature alarm has occured

The Current Temperature is 63.075 Centigrade.
The Maximum Temperature is 63.658 Centigrade.
The Minimum Temperature is 62.516 Centigrade.

So the MPSoC was over 10 Deg C higher than its threshold... Hopefully nothing got cooked too badly.

I can see you had this in your screenshot as well; but it wasn't as hot as mine got...

RE: Do Not Hide the Problem - A Correct SW Lab 7 Solution

nerdyupdates — Sat, 02 Nov 2019 05:19:41 GMT

Nice investigation into this. Thanks for sharing your knowledge on compiler optimization.

One question which may not have a simple answer, but why is the "while" statement not enough for the compiler to know the programmer's intent even though the "DstDone" variable was not originally declared volatile? Seems almost like the compiler is making an improper optimization by ignoring the while altogether.