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