55 lines
1.3 KiB
Python
55 lines
1.3 KiB
Python
#!/usr/bin/env python
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import redis
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import time
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from serial import Serial, SerialException
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import sys
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height = 5
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width = 8
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def send(r, s):
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if not r.exists('new'):
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return None
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data = r.rpop('new')
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if data is not None and len(data) > 0:
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s.write(data.encode())
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# size = s.write(data)
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# print('Data sent ({} bytes)'.format(size))
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def serialConfigure(port_name, baudrate=9600):
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'''
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We use a very low baudrate by default because the USB port on the teensy
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enforce this value: http://www.pjrc.com/teensy/td_serial.html
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'''
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ser = Serial()
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ser.port = port_name
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ser.baudrate = baudrate
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ser.timeout = 5
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try:
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ser.open()
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except SerialException as e:
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sys.stderr.write("Could not open serial port %s: %s\n" % (ser.portstr, e))
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return
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ser.write(height.to_bytes(4, byteorder='little'))
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print(int.from_bytes(ser.read(4), byteorder='little'))
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ser.write(width.to_bytes(4, byteorder='little'))
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print(int.from_bytes(ser.read(4), byteorder='little'))
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ser.timeout = 1
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return ser
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if __name__ == "__main__":
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r = redis.Redis()
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r.hset('config', 'imgsize', height * width * 24 + 1)
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s = serialConfigure('/dev/ttyACM0')
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while True:
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while r.llen('new') > 0:
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send(r, s)
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time.sleep(10)
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