sciencelab.py 文件源码

def fetch_int_data_from_LA(self,bytes,chan=1):
        """ 
        fetches the data stored by DMA. integer address increments

        .. tabularcolumns:: |p{3cm}|p{11cm}|

        ==============  ============================================================================================
        **Arguments** 
        ==============  ============================================================================================
        bytes:          number of readings(integers) to fetch
        chan:           channel number (1-4)
        ==============  ============================================================================================
        """
        try:
            self.H.__sendByte__(CP.TIMING)
            self.H.__sendByte__(CP.FETCH_INT_DMA_DATA)
            self.H.__sendInt__(bytes)
            self.H.__sendByte__(chan-1)

            ss = self.H.fd.read(int(bytes*2))
            t = np.zeros(bytes*2)
            for a in range(int(bytes)):
                t[a] = CP.ShortInt.unpack(ss[a*2:a*2+2])[0]

            self.H.__get_ack__()
        except Exception as ex:
            self.raiseException(ex, "Communication Error , Function : "+inspect.currentframe().f_code.co_name)

        t=np.trim_zeros(t)
        b=1;rollovers=0
        while b<len(t):
            if(t[b]<t[b-1] and t[b]!=0):
                rollovers+=1
                t[b:]+=65535
            b+=1
        return  t