Hi,
I want to use standard BMAC CCA mechanism. i.e to take radio samples, and if
there are 5 samples with no outliers then Medium is Busy,
For transmit, take one sample if its below the current Noise floor then
medium is free.
I just need to know that how the cc2420 transiver get to know that its
receiving a valid byte ?
I mean, if i am using PacketIndicator, and EnergyIndicator for CCA, then
cc2420 chip is doing the CCA for us ?
Thanks
Obaid
PS: TinyOS2.x code for CCA ()
task void getCca() {
uint8_t detects = 0;
.........
atomic {
for( ; ccaChecks < MAX_LPL_CCA_CHECKS && call SendState.isIdle();
ccaChecks++) {
if(*call PacketIndicator.isReceiving(*)) {
signal PowerCycle.detected();
return;
}
if(*call EnergyIndicator.isReceiving()*) {
detects++;
if(detects > MIN_SAMPLES_BEFORE_DETECT) {
signal PowerCycle.detected();
return;
}
// Leave the radio on for upper layers to perform some
transaction
}
}
}
}
}
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