[Tinyos-help] the status of SPI is always 0xFF (have used Resource, CSN interfaces)

[Bo Zhu]

environment: micaz, tinyos 2.10, mib510, ubuntu 8.10

I am trying to write and read some ram data via SPI, and also perform some
basic command such as SNOP to get the status of SPI.
But what I read from the SPI are all 0xFF, and the status of SPI is always
0xFF.
I have used the Resource interface to gain the access of SPI and pull down
the CSN, just as follows:

event void SpiResource.granted() {
    cc2420_status_t status;

    call CSN.clr();
    status = call SNOP.strobe();
    call CSN.set();
    releaseSpiResource();

    printf("status = %X\n", status);
    printfflush();
}

Does anybody know why? Do I miss something important?

The attachment of this email is a full project for test (very simple, the
main file has only 70 lines).
Could some help me take a look or have a try? (make install, run the
printf.sh, and reset the micaz mote)

Thanks in advance.
Bo Zhu
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