katana.py 文件源码

def query_sysex_data( self, addr, len ):
        self.receive_cond.acquire()

        self.data = []
        self.addr = []
        msg = list( addr )
        msg.extend( Katana.encode_scalar(len) )

        self.target_count = (len // 241) + 1
        self._send( QUERY_PREFIX, msg )

        result = self.receive_cond.wait(5)
        if not result:
            syslog.syslog( "Error: Timeout on cond wait" )

        self.receive_cond.release()

        return self.addr, self.data

    # Request sysex data (possibly requiring multiple chunks) by
    # passing first and last address of desired range. It is the
    # caller's responsibility to ensure the total response does not
    # span address discontinuities.  If that occurs the chunk count is
    # likely to be over-estimated and the operation will timeout.