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Python array.frombytes方法代码示例

本文整理汇总了Python中array.array.frombytes方法的典型用法代码示例。如果您正苦于以下问题:Python array.frombytes方法的具体用法?Python array.frombytes怎么用?Python array.frombytes使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在array.array的用法示例。


在下文中一共展示了array.frombytes方法的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的Python代码示例。

示例1: _exchange

# 需要导入模块: from array import array [as 别名]
# 或者: from array.array import frombytes [as 别名]
 def _exchange(self, frequency, cs_cmd, out, readlen):
     """Perform a half-duplex transaction with the SPI slave"""
     if not self._ftdi:
         raise SpiIOError("FTDI controller not initialized")
     if len(out) > SpiController.PAYLOAD_MAX_LENGTH:
         raise SpiIOError("Output payload is too large")
     if readlen > SpiController.PAYLOAD_MAX_LENGTH:
         raise SpiIOError("Input payload is too large")
     if self._frequency != frequency:
         self._ftdi.set_frequency(frequency)
         # store the requested value, not the actual one (best effort)
         self._frequency = frequency
     write_cmd = struct.pack('<BH', Ftdi.WRITE_BYTES_NVE_MSB, len(out)-1)
     cmd = Array('B', cs_cmd)
     if PY3:
         cmd.frombytes(write_cmd)
     else:
         cmd.fromstring(write_cmd)
     cmd.extend(out)
     if readlen:
         read_cmd = struct.pack('<BH', Ftdi.READ_BYTES_NVE_MSB, readlen-1)
         if PY3:
             cmd.frombytes(read_cmd)
         else:
             cmd.fromstring(read_cmd)
         cmd.extend(self._immediate)
         if self._turbo:
             cmd.extend(self._cs_high)
             self._ftdi.write_data(cmd)
         else:
             self._ftdi.write_data(cmd)
             self._ftdi.write_data(self._cs_high)
         # USB read cycle may occur before the FTDI device has actually
         # sent the data, so try to read more than once if no data is
         # actually received
         data = self._ftdi.read_data_bytes(readlen, 4)
     else:
         if self._turbo:
             cmd.extend(self._cs_high)
             self._ftdi.write_data(cmd)
         else:
             self._ftdi.write_data(cmd)
             self._ftdi.write_data(self._cs_high)
         data = Array('B')
     return data
开发者ID:kery-chen,项目名称:pyftdi,代码行数:47,代码来源:spi.py


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