Hi, Sorry for my explanation but I think is not clear. Let's try again.
I've one mote which send packets in broadcast. On the other side I've three motes that receive the packets from first mote. One mote of them is connected whit the PC (mote B). I've made a programm that show the data content of the received packets in mote B. Maybe mote B receives packets whit errors in data content, then I send a message to the others receiver motes and they send mote B the received packet again. (I guess that packets of this motes can have others errors in data content). Now I've three packets in mote B. I can show the data content of the three packets in my application. I want to compare bit to bit the data content of this three received packets to create a good data content and I only show that in my application. I don't know how to make this comparison bit to bit. I make an example: Transmitter: Send Hello Receiver (mote B): Receive Mello Receiver C: Receive HeUlo Receiver D: Receive HellR I want to compare bit to bit (Mello, HeUlo and HellR) to create the word Hello using majority voting. I hope that you understand my explanation better. Thanks in advanced, Sonia 2009/3/3 Razvan Musaloiu-E. <[email protected]> > Hi! > > On Tue, 3 Mar 2009, Sonia Pardo wrote: > > Dear All, >> >> We can't use memcmp because this function only say us if the packet is the >> same or not. >> We would like to compare bit to bit because I want to rebuild the packet. >> >> For example, we receive three packets from three different motes (But >> three >> motes send the same information). One of them receives Hello. Other mote >> receives Hello too, but the third packet receives Mello. This packet has >> errors, but if I compare the three packets bit to bit, I can rebuild the >> message of the third packet and I can say that the information of this >> packet is Hello too. >> >> I need a function which compare bit to bit, because I don't know how can I >> do this...and I think that memcmp is not valid for this. >> >> Can anyone help us? >> >> > CC2420 and RF230 are packet-based radios so you don't have access to > information about the quality of each bit. CC1000 from mica2 is not > packet-based so what you want should be possible there. > > -- > Razvan ME > > > 2009/3/2 Janos Sallai <[email protected]> >> >> How about memcmp in string.h? This is standard C. >>> >>> Janos >>> >>> On Mon, Mar 2, 2009 at 11:13 AM, Jordi Pérez <[email protected]> wrote: >>> >>>> Dear all, >>>> >>>> I have a Base Station which receives the same packet from three >>>> different >>>> motes. The packets must be the same, but maybe, one of them could have >>>> some >>>> errors. So, I want to make a task which compare bit to bit, or byte to >>>> byte, >>>> the three packet received to rebuild a new packet without errors. >>>> >>>> How could I do this task? I don't know how to compare bit to bit (or >>>> byte to >>>> byte) a received packet. Can you help me please? >>>> >>>> Thanks in advanced, >>>> >>>> Jordi >>>> >>>> >>>> >>> >>>
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