CC2400 data sheet and info http://focus.ti.com/docs/prod/folders/print/cc2400.html
Kevin On Mon, Mar 31, 2008 at 2:03 AM, David <[EMAIL PROTECTED]> wrote: > Do you know if this applies to the cc2400, or where I can look this up? > > Thanks, > > David. > > > > On Mon, Mar 31, 2008 at 10:54 AM, SANG Junjun <[EMAIL PROTECTED]> wrote: > > I think it depends on the radio. > > Because some radio can only send/recv a fixed size of packet, for example > > nRF905. > > > > > > On Mon, Mar 31, 2008 at 3:06 PM, Kevin Klues <[EMAIL PROTECTED]> wrote: > > > > > > > If you call send() with a length of 2 bytes, only two bytes will be > > > transmitted over the air. The TOSH_DATA_LENGTH paramter basically > > > determines the maximum size of the payload you could ever send and > > > receive. Essentially, it is used to define the size of the data > > > portion of the message_t struct used to hold messages on your mote. > > > The length passed to send() is stored in the header portion of > > > message_t, and when the message is being spooled out over the radio, > > > theis length field is read to determin how many of the bytes stored in > > > the data portion of the message should actually be sent. > > > > > > Kevin > > > > > > > > > > > > > > > On Sun, Mar 30, 2008 at 11:37 PM, David <[EMAIL PROTECTED]> wrote: > > > > Hi list. > > > > > > > > I've taken a look at tep111 and tep126, but there's something which > > > > isn't clear to me from the teps. > > > > > > > > Are the packets transmitted over radio a fixed length or variable > > > > (based on requested payload length)? > > > > > > > > eg, if you leave TOSH_DATA_LENGTH at 28, but send a payload of 2 > > > > bytes, will the other 26 bytes worth of payload still be sent over > > > > radio? > > > > > > > > I'm asking because one of my apps needs to send as small as possible > > > > packets (reduce battery usage, and to hog the radio freqeuncy for as > > > > short as possible). However, I would like the app to still be able to > > > > receive larger packets. Otherwise all the apps in the mote network > > > > need to have the smaller TOSH_DATA_LENGTH, which is bothersome. > > > > > > > > Any insights on this subject? > > > > > > > > David. > > > > _______________________________________________ > > > > Tinyos-help mailing list > > > > [email protected] > > > > > > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > > > > > > > > > > > > > -- > > > ~Kevin > > > > > > > > > > > > _______________________________________________ > > > Tinyos-help mailing list > > > [email protected] > > > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > > > > > > > > -- > > Best Regards, > > SANG JUNJUN > > http://www.tinysys.cn/ > > > -- ~Kevin _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
