Hello Mohammed, > What I want to understand is how the MCU gets the data off the network > and stores it in the data memory. Is there any specific port through > which the MCU gets the data?
My understanding of this question is "What path does data take from the radio into a usable form by my TinyOS application running on a micaZ node?" My terminology may be a little off because I'm also just starting to dig into TinyOS. With a bit of luck others will correct any mistakes I make. But here is what I understand. The micaZ uses a CC2420 radio and data packets move between the CC2420 and AVR microcontroller over the SPI bus. The manual for the ATMega128 has a nice section on SPI, and the data sheet for the CC2420 talks about the gory details of interfacing with the radio over the SPI (and may be a lot more detail than you need). For an overview of SPI in TinyOS you can try: http://www.tinyos.net/tinyos-2.x/doc/html/tep117.html I haven't read it yet, but at first glance it looks like a good spot to start. For how the TinyOS radio driver handles this SPI tranfer, try looking at the CC2420ReceiveP.nc component. Perhaps start with the functions beginReceive, receive, RXFIFO.readDone, and receiveDone_task to get started. The call to receiveDone_task passes the the packet to the higher layer Receive interface where it gets routed by TinyOS to the appropriate handler. Best of luck, -Roy _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
