Hi,
I'm trying to receive data from pc using TOSBase, and I changed
AMStandard.nc as you suggested. However, it seems that I should
recompile AMStandard.nc.
My question is how am I gonna make to recompile a changed system
source file. Thanks for any answer.
Btw, I'm using tinyos-1.x, and tmote sky sensors.
Baris
>Hi,
>
>Could TOSBase (and hence tos/platform/mica2/RadioCRCPacket.nc) be
>sending out packets with wrong CRC? This sounds unlikely since it
>would then break a lot of things, but here is what I observed.
>
>The platform was mica2, and the tinyos version was 1.1.7.
>
>I was trying to debug a problem that a mote (call it B) with TOSBase
>could not send a message to another mote (call it R) with
>OscilloscopeRF. The setup was the same as the latter half of Tutorial
>6. In the same setup, R could send data packet to B (i.e. radio
>communication in the reverse direction) without problem.
>
>
>To debug the problem, I added a third mote (call it S) to snoop on the
>packet between B and R. The mote S was installed TOSBase (and
>attached, thru' an MIB510, to a PC running the java program
>net.tinyos.tools.listen).
>
>I found that S could not see packets from B to R, UNLESS I disabled
>CRC check in its TOSBase. In other words, S could see these packets
>only if I changed a line in in apps/TOSBase/TOSBaseM.nc:
> event TOS_MsgPtr RadioReceive.receive(TOS_MsgPtr Msg) {
> TOS_MsgPtr pBuf;
> ...
> //LEECY disable crc checking for now
> if (1) {
> // if (Msg->crc) {
> ...
> post RadioRcvdTask();
>Furthermore, I also found that if I disabled the CRC checking in
>AMStandard.nc (implementation module for GenericComm, which is used by
>OscilloscopeRF), then R WOULD BE ABLE to receive the packet from B.
>The code change was the following, in tos/system/AMStandard.nc
> TOS_MsgPtr received(TOS_MsgPtr packet) __attribute__ ((C,
> spontaneous)) {
> //LEECY disable crc checking for now
> // if (packet->crc == 1 &&
> if (
> packet->group == TOS_AM_GROUP &&
> (packet->addr == TOS_BCAST_ADDR ||
> packet->addr == addr))
> {
> ...
> tmp = signal ReceiveMsg.receive[type](packet);
> ...
> }
> return packet;
> }
>
>Any comments or insight? Thanks!
>
>Clement
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