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void digitalWriteByte(value)
    int value
...
int wiringPiSPISetup(channel, speed)
    int channel
    int speed

void spiDataRW(int channel, SV* byte_ref, int len){

...

    inline_stack_done;
}

void spiDataRW (channel, byte_ref, len)
    int    channel
...
          XSRETURN_EMPTY;
        }
        return;