Clear channel assessments are performed automatically by the CC2420 radio
stack before any and every transmission, unless you explicitly disable it.
In the CC2420 radio, a CSMA strategy is implemented where initial and
congestion backoffs are set for random lengths of time to prevent
transmissions
On Jul 17, 2008, at 10:25 AM, Hui Kang wrote:
> Dear All:
> In my tinyos-2.x application, I would like to check the channel before
> sending a packet. By copying the following code from
> CC2420TransmitP.nc,
> I found the congest is always set as TRUE even I have only one mote
> turn
> on. Co
If you want to check the channel *before* sending a packet, you can sample
the CCA pin directly. This GeneralIO is provided by HplCC2420PinsC.
The code you're looking at here actually sends a packet, if the channel is
immediately found to be clear. If you're not doing so already, you must
also a
Dear All:
In my tinyos-2.x application, I would like to check the channel before
sending a packet. By copying the following code from CC2420TransmitP.nc,
I found the congest is always set as TRUE even I have only one mote turn
on. Could anyone help to solve this problem or any other smarter way
