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61 lines
1.7 KiB
Python
61 lines
1.7 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright 2018 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import serial
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import struct
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class Bluetooth():
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DEVICE_FILE = '/dev/serial0'
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BAUDRATE = 115200
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def __init__(self):
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try:
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self._conn = serial.Serial(self.DEVICE_FILE, self.BAUDRATE)
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self._dummy = False
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print('Bluetooth')
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except serial.SerialException:
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self._conn = None
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self._dummy = True
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print('Dummy Bluetooth')
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def send(self, string):
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"""Send |string| as a series of characters. |string| should be
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alphabets, numbers and symbols which can be typed from your keyboard."""
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if self._dummy:
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print('bluetooth: {}'.format(string))
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return
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self._conn.write(string)
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# See http://ww1.microchip.com/downloads/en/DeviceDoc/bluetooth_cr_UG-v1.0r.pdf
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# for detail.
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UART_CODES = {
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'KEY_RIGHT': 7,
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'KEY_BACKSPACE': 8,
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'KEY_ENTER': 10,
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'KEY_LEFT': 11,
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'KEY_DOWN': 12,
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'KEY_UP': 14,
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}
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def command(self, cmd):
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if cmd not in self.UART_CODES:
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print('Unknown Command: {}'.format(cmd))
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return
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if self._dummy:
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print('bluetooth: command({})'.format(cmd))
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return
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self.send(struct.pack('b', self.UART_CODES[cmd]))
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