47 lines
1.2 KiB
Python
47 lines
1.2 KiB
Python
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import numpy
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from Encoder import Encoder
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class PPM:
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"""The PPM class contains functions about PPM manipulation
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"""
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def frame_1090es_ppm_modulate(self, even, odd):
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"""
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Args:
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even and odd: The bits you would converted to PPM
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Returns:
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The bytearray of the PPM data
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"""
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ppm = [ ]
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encoder = Encoder()
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for i in range(48): # pause
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ppm.append( 0 )
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ppm.append( 0xA1 ) # preamble
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ppm.append( 0x40 )
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for i in range(len(even)):
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word16 = numpy.packbits(encoder.manchester_encode(~even[i]))
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ppm.append(word16[0])
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ppm.append(word16[1])
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for i in range(100): # pause
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ppm.append( 0 )
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ppm.append( 0xA1 ) # preamble
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ppm.append( 0x40 )
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for i in range(len(odd)):
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word16 = numpy.packbits(encoder.manchester_encode(~odd[i]))
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ppm.append(word16[0])
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ppm.append(word16[1])
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for i in range(48): # pause
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ppm.append( 0 )
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#print '[{}]'.format(', '.join(hex(x) for x in ppm))
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return bytearray(ppm)
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