return self._spi.write(buf, start, end)
 
     def readinto(self, buf, start=0, end=None, write_value=0):
-        return self._spi.readinto(buf, start, end)
+        return self._spi.readinto(buf, start, end, write_value=write_value)
 
     def write_readinto(self, buffer_out, buffer_in,  out_start=0, out_end=None, in_start=0, in_end=None):
         return self._spi.write_readinto(buffer_out, buffer_in, out_start, out_end, in_start, in_end)