[Tinyos-help] about the SPI bus in MICAZ in tinyos2.x

[songangel]

Hello, all

        I have found the related answers about SPI bus usage in the MICAZ node as following
        http://www.mail-archive.com/tinyos-help@millennium.berkeley.edu/msg20111.html
        http://mail.millennium.berkeley.edu/pipermail/tinyos-help/2008-April/032819.html
       In my sensor node, the hardware is same as MICAZ-OEM expect that the SS pin(for SPI communication) of cc2420 is connected to the power.
That means I can not control the SS pin for SPI communication of CC2420.
       Now I want to add a device with SPI communication to this sensor node. Just as Phil answered  connecting the same pins as CC2420.
 I don´t know whether in my sensor node,  SS pin for SPI communication also is connected to the power as CC2420 ?  
 If it is the same,   how to distinguish the cc2420 and this new device? According to the SPI protocol, SS pin is used to distinguish  the different slaves. 
 I found that Phil said Resource arbiter could be used. But I don´t know how to use it, could anybody give me an example?
        Thanks in advance.

     Jianxin 
       
  

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