Scott Miller wrote: > Good information, thanks. Do you know what firmware version you're running? > > I'm trying to think where it might be getting stuck that the green LED > would be on. Any lockup has to be either in a loop where the watchdog > timer is getting cleared (and I try to make sure those aren't going to > be infinite loops) or a hardware glitch where the oscillator stops > running and the watchdog timer along with it. > > This was with the VP2 station, right? > Scott,
Given the unattended nature of a lot of the trackers a device such as the MAX690 (or suitable variant) is a worthwhile option? Even if the board space was there for someone to add their own, and the uP tickled the watchdog line anyway? This would prevent uP oscillator glitches from locking the unit up. I had to go down this patch because the built in Watchdogs in uPs were proving ineffective in harsh environments. The MAX690 does brownout detection too and will hold the uP in reset until the voltage conditions are good. David. -- David Ingram (VK4TDI) To avoid spam trap, send email to dave at ingramtech dot com Brisbane, Queensland, Australia W: http://www.ingramtech.com/ MH: QG62lm
