Just to follow up on my previous message... I was eventually inspired to comment out the RadioControl.stop() call in RadioSend.sendDone(...). This was apparently causing the delays that I was experiencing. I don't completely understand why that worked, but I'm happy now.
I found David Moore's code (http://rvsn.csail.mit.edu/netloc/) useful in tracking the issue down. -Drew On 4/11/07, Drew Stovall <[EMAIL PROTECTED]> wrote:
Using the cricket platform, I'd like to send the distance measurements (normally sent via UART) via the radio instead. To do this, I've inserted a bit of code to queue radio messages into the "ReportPulse" task. Unfortunately, when I do this the rate of both the RF and UART messages suddenly drops to 1 message every 10 seconds (instead of 1-2 messages per second). The problem appears related to my use of the radio since the message rate is not sensitive to the existence of the UART bits of the task. If I turn an LED on when I queue a message, and turn it off after it's sent, the LED is only lit for a faction of second (ie, the message doesn't stay in-queue for very long). This leads me to believe that the delay between ReportPulse tasks is not caused by the actual transmission of the message. At this point, I should confess that I'm using the Transceiver component from ../contrib/rincon (HEAD) which has served me very well in the past... though in the past I was using the Mica2 platform. In the off-chance that there's some interaction between this component at the cricket code, I'm reimplementing my radio code to use more basic mechanisms... but I'd really rather not. ;-) So, my questions are: 1) Has anyone out there successfully transmitted cricket distance measurements via radio? (If so, could I get a code snippet?) 2) Is there a potential for interaction between my use of the radio that would cause the ReportPulse task to only be fired 1/10th as often? (or something that might introduce a ~10 second delay) - Drew Stovall UT Austin
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