Hello,
I was hoping to hear your opinion about a serious problem I have - it is either I solve it or reduce my LPC2478 CPU speed from 72[MHz] to 64[MHz] (11% loss. The problem does not seem to be occurring at lower MHz settings). I posted about this in the past but it was a long time ago. When I place a controller in an environmental chamber and increase the temperature to 80+ Celsius degrees, I often see data abort exceptions, and sometimes I get the impression that the PC takes a hike (even the firmware LED that blinks every 1 second becomes irregular for a while before it stops). The program is launched by a boot loader and has a lower level supporting firmware layer that handles some interrupts (not all). I also see that if RTX is not started at all (but the application hangs in a "for (;;)" loop instead, hence the bootloader and firmware layer were/are involved, but the application is idle) - the system never crashes! I have excluded, as far as I could tell, the roll of external memory or RTX in this situation. However, I still suspect RTX a little (even though my test programs never crashed). My question: did you ever encounter such a situation? Where do I look best? can this be the result of a misbehaving peripheral? NXP have confirmed the LPC2478 is not the reason.
What is the humidity of your test chamber?
humidity: 0%.
"humidity: 0%."
Whew, dry heat man. Doesn't sound likely to use.
Are you absolutely sure about that?
well, the control panel of the chamber says: "current value: 0". my girlfriend could use the air inside to feed her hair dryer...do you think I should test another setting (but I think that increased humidity will hurt heat dissipation, not...?) ?
It may say 0, but it's very unlikely that humidity in the test chamber is really 0%.
of course, I realize that.