Thanks for the quick explanation. That makes perfect sense. I was looking at the 128k/512k number on the micaz datasheet instead of the 4k from the ATMEL datasheet.
Thanks again. Joe On Fri, Mar 18, 2011 at 12:40 PM, Philip Levis <p...@cs.stanford.edu> wrote: > > On Mar 18, 2011, at 10:08 AM, Joe Dvorak wrote: > > > Hello, > > > > > > I ran into a problem where the timer fails to fire based on the size of > variables defined in my program. The program has several timers and data > arrays to store the results before transmitting. My program runs great with > data arrays of a certain size, but an increase of just a few extra bytes > causes the timers to stop working. There is no error while compiling. I have > to download to the mote to test this behavior. With data arrays of 688 > samples, the program runs normally. With data arrays of 692 samples, the > program downloads, starts, and StdControl.init() and StdControl.start() both > run. However, the timer that is started in these functions never fires and > the mote does nothing further. To cause this behavior, I only change the > length of the data arrays. > > > > > > I am using a micaz mote with an MDA300 sensorboard from Crossbow/Memsic > for sampling. The program is based on the XSensorMDA300 program that is in > the …/contrib/xbow/apps/XSensorMDA300 directory of Tinyos 1.1. The program > is compiled for Tinyos 1.1. > > > > > > Size results for a working program: > > > > ROM: 19378 > > > > RAM: 4053 > > > > > > Size results for a non-working program: > > > > ROM: 19378 > > > > RAM: 4069 > > > > > > Any help or insight into the problem would be greatly appreciated. I > would like to understand the issue better so I can determine the best way to > work around the issue. > > The device has 4092 bytes of RAM. With the larger variables your programs > writes to them is corrupting the stack, which shares that 4092 bytes with > your data. > > Phil
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