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42 lines
1.2 KiB
Python
42 lines
1.2 KiB
Python
from __future__ import print_function
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'''SerialTransport implements wire transport over serial port.'''
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# Local serial port loopback: socat PTY,link=COM8 PTY,link=COM9
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from select import select
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import serial
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from .transport import Transport
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class SerialTransport(Transport):
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def __init__(self, device, *args, **kwargs):
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self.serial = None
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super(SerialTransport, self).__init__(device, *args, **kwargs)
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def _open(self):
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self.serial = serial.Serial(self.device, 115200, timeout=10, writeTimeout=10)
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def _close(self):
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self.serial.close()
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self.serial = None
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def ready_to_read(self):
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rlist, _, _ = select([self.serial], [], [], 0)
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return len(rlist) > 0
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def _write(self, msg, protobuf_msg):
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try:
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self.serial.write(msg)
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self.serial.flush()
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except serial.SerialException:
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print("Error while writing to socket")
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raise
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def _read(self):
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try:
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(msg_type, datalen) = self._read_headers(self.serial)
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return (msg_type, self.serial.read(datalen))
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except serial.SerialException:
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print("Failed to read from device")
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raise
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