katana.py 文件源码

def query_sysex_range( self, first_addr, last_addr ):
        self.receive_cond.acquire()

        span = Katana.decode_array(last_addr) - Katana.decode_array(first_addr)
        offset = Katana.encode_scalar( span + 1 )

        self.data = []
        self.addr = []

        msg = list( first_addr )
        msg.extend( offset )

        # Calculate expected number of chunks.  Maximum chunk is 255 bytes
        # with max payload of 241 data bytes/
        self.target_count = ((span + 1) // 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

    # Bias 4-byte sysex array by scalar value