51 lines
1.4 KiB
Python
51 lines
1.4 KiB
Python
import serial
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BROADCAST = 0xfe
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class MDC(serial.Serial):
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"""Samsung 400MX MDC remote control client
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Docs: https://www.samsung.com/us/pdf/MDC_400DXn460DXn570DXn700DXn820DXn460TXn_v1.pdf
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"""
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def command(self, command, data=[], target_id=BROADCAST):
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if target_id == 0:
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target_id = 0xff
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payload = bytearray([0xaa, command, target_id, len(data)] + data)
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# Checksum
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payload.append(sum(payload[1:]) & 0xff)
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self.write(payload)
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def read_frame(self):
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payload = bytearray([])
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payload.extend(self.read(4))
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if payload[0] != 0xaa:
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raise Exception('Invalid preamble %r' % payload[0])
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if payload[1] != 0xff:
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raise Exception('Unexpected command field? %r' % command)
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payload.extend(self.read(payload[3]))
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checksum = ord(self.read(1))
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expected_checksum = sum(payload[1:]) & 0xff
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if checksum != expected_checksum:
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raise Exception('Invalid checksum %r != %r' % (checksum, expected_checksum))
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return payload[2], payload[4:]
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def request(self, *args, **kwargs):
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self.command(*args, **kwargs)
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return self.read_frame()
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if __name__ == '__main__':
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mdc = MDC('/dev/serial/by-id/usb-Prolific_Technology_Inc._USB-Serial_Controller-if00-port0', 9600)
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mdc.command(0x10, [])
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while True:
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print(mdc.read_frame())
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