[Tinyos-host-mote-wg] [Tinyos-2.0wg] CC2420 radio stack

[Joe Polastre]

CCA will be used as an interrupt because that's how you determine if
the 16MHz oscillator has started.  That has been used in the radio
stack since its inception and will continue to be used (why would you
want to poll???) FIFO is extremely useful as an interrupt for doing
concurrent packet receptions. (Ie, MCU receives from RXFIFO while
CC2420 receives next packet).  I would figure that Xbow is aware of
this since it is used in most Zigbee stacks (including the ones that
jhill and others have written).

I can't help it that the MicaZ doesn't use these as interrupts and
you're not happy about that situation.  Regardless, these pins are
extremely useful; its too bad the MicaZ has to poll instead of get an
interrupt (This is an issue I brought up in Nov 2003 at the MicaZ
design review)

If you don't like the architecture for the CC2420, please bring it up
with the group rather than subtle innuendos in your commit messages.

> Empty stubs for external interrupt wiring required by CC2420Radio.  I hope 
> the stack never actually uses FIFO and CCA as irq, because it won't be 
> cross platform compatible.

Finally, this makes no sense because both FIFO and CCA are CC2420
dependent, NOT platform dependent.

-Joe

---------- Forwarded message ----------
From: Martin Turon <mturon at users.sourceforge.net>
Date: Jul 28, 2005 10:24 PM
Subject: [Tinyos-2-commits] CVS:
tinyos-2.x/tos/platforms/micaz/chips/cc2420
CC2420RadioInterruptCCA.nc, 1.1.2.1,	1.1.2.2
CC2420RadioInterruptFIFO.nc, 1.1.2.1, 1.1.2.2
To: tinyos-2-commits at mail.millennium.berkeley.edu


Update of /cvsroot/tinyos/tinyos-2.x/tos/platforms/micaz/chips/cc2420
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv16842

Modified Files:
      Tag: tinyos-2_0_devel-BRANCH
        CC2420RadioInterruptCCA.nc CC2420RadioInterruptFIFO.nc
Log Message:
Empty stubs for external interrupt wiring required by CC2420Radio.  I
hope the stack never actually uses FIFO and CCA as irq, because it
won't be cross platform compatible.

Index: CC2420RadioInterruptCCA.nc
===================================================================
RCS file: /cvsroot/tinyos/tinyos-2.x/tos/platforms/micaz/chips/cc2420/Attic/CC2420RadioInterruptCCA.nc,v
retrieving revision 1.1.2.1
retrieving revision 1.1.2.2
diff -C2 -d -r1.1.2.1 -r1.1.2.2
*** CC2420RadioInterruptCCA.nc  13 Jul 2005 07:02:28 -0000      1.1.2.1
--- CC2420RadioInterruptCCA.nc  29 Jul 2005 05:24:15 -0000      1.1.2.2
***************
*** 32,40 ****
  {
    components
!       CC2420RadioIO
!     , new InterruptM()
      ;

    Interrupt = InterruptM.Interrupt;
!   InterruptM.HPLInterrupt -> CC2420RadioIO.CC2420RadioCCA;
  }
--- 32,40 ----
  {
    components
!       HPLInterruptC,
!       new InterruptM()
      ;

    Interrupt = InterruptM.Interrupt;
!   InterruptM.HPLInterrupt -> HPLInterruptC.NoInt;  // not connected to irq
  }

Index: CC2420RadioInterruptFIFO.nc
===================================================================
RCS file: /cvsroot/tinyos/tinyos-2.x/tos/platforms/micaz/chips/cc2420/Attic/CC2420RadioInterruptFIFO.nc,v
retrieving revision 1.1.2.1
retrieving revision 1.1.2.2
diff -C2 -d -r1.1.2.1 -r1.1.2.2
*** CC2420RadioInterruptFIFO.nc 13 Jul 2005 07:02:28 -0000      1.1.2.1
--- CC2420RadioInterruptFIFO.nc 29 Jul 2005 05:24:15 -0000      1.1.2.2
***************
*** 32,41 ****
  {
    components
!       CC2420RadioIO
!     , new InterruptM()
      ;

    Interrupt = InterruptM.Interrupt;
!   InterruptM.HPLInterrupt -> CC2420RadioIO.CC2420RadioFIFO;
  }

--- 32,41 ----
  {
    components
!       HPLInterruptC,
!       new InterruptM()
      ;

    Interrupt = InterruptM.Interrupt;
!   InterruptM.HPLInterrupt -> HPLInterruptC.NoInt;  // not connected to irq
  }


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