Hi! On Mon, 19 Jan 2009, Andrey Gursky wrote:
> Hi Razvan and Miklos! > > Razvan Musaloiu-E. wrote: >> Hi! >> >> On Wed, 14 Jan 2009, Andrey Gursky wrote: >> >>> Hi Razvan! >>> >>> I haven't such deeply tests as Miklos. My observations on the app level: >>> the messages are being successfully sent, but on the remote mote they >>> are being not received. >> >> What does "successfully sent" mean? You got an ack back? :P > > You're right, there are really many NACK. But many packets, which were > sent but not acknowledged, has being successfully received. What could > result in this? > I'm not familiar with the way the acks are implemented in RF230. On CC2420 the reverse problem was observed: a packet was acked even if it was not properly retrieved from the CC2420 FIFO. The solution was to use software acks: the MCU retrieved the packet and then sends a command to CC2420 to ask for an ack to be send. -- Razvan ME >>> Thanks for your table with RSSI and LQI. >>> >>> I'm wondering if only particularly RF230 don't like the channel 26? >>> >>> >>> Razvan Musaloiu-E. wrote: >>>> Hi! >>>> >>>> On Tue, 13 Jan 2009, Andrey Gursky wrote: >>>> >>>>> Hi Lizhao and all! >>>>> >>>>> youlizhao wrote: >>>>>> Dear all, >>>>>> >>>>>> Hi! >>>>>> >>>>>> I hava a problem with iris default channel. >>>>>> >>>>>> Iris uses RF230. According to the tinyos-help, the iris default channel >>>>>> is 11, which is defined in file >>>>>> /opt/tinyos-2.1.0/tos/chips/platforms/iris/chips/rf230/HplRF230.h >>>>>> >>>>>> But my problem is: >>>>>> As far as i know, there exits interference between 802.15.4 and 802.11 >>>>>> in channel 11, while in channel 26 little interference. Why not using >>>>>> channel 26 as the default in iris platform, just as cc2420? >>>>>> >>>>> >>>>> It's really interesting! According to my experience if I switch IRIS to >>>>> the channel 26, I get bad radio communication (with other IRIS and >>>>> MicaZ). But if switch MicaZ to the (for them nonstandard) channel 11 >>>>> there are no problems to communicate with other MicaZ and IRIS. >>>> >>>> Can you give a little more information about how the radio communication >>>> was bad? Did you notice an increase of lossrate? Change in RSSI or LQI? >>>> >>>> -- >>>> Razvan ME >>>> >>>> >>> >> >> > > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
