KNX contactless
From OpenScience
WAV-Files
- Sample WAV-File at 44.1kHz sampling frequency The sound was sampled at 96kHz and than downsampled to 44.1kHz in order to make in playable on most sound cards.
- Sample WAV-File at 96kHz sampling frequency Sampling frequency 96000Hz, IEEE Float 32 bit samples, little endian, mono
- Sample WAV-File at 96kHz sampling frequency Sampling frequency 96000Hz, IEEE Float 32 bit samples, little endian, mono
See [1] for information about the file format.
Programm
import struct
f = open('Sample.wav', 'rb')
f.seek(46)
sample1 = 0
sample2 = 0
sample3 = 0
lasti = 0
decoded = '0'
ordered =
hexvalue =
telegrambytes = []
i = 1
while True:
sample1 = sample2
sample2 = sample3
buf = f.read(4)
if not buf: break
sample3 = struct.unpack('<f', buf)[0]
if sample1 < sample2:
if sample2 >= sample3:
if sample2 > 0.1:
samplessincelast = i - lasti
print i, sample2, samplessincelast, decoded
if (samplessincelast > 155) and (decoded != ):
print 'Full telegram ', decoded, hex(int(decoded, 2))
databits =
char =
symbol =
length = len(decoded)
if length > 11:
for pos in range(0,length):
symbol = symbol + decoded[pos]
if len(symbol) == 13:
startbit = symbol[0]
paritybit = symbol[9]
stopbit = symbol[10]
gap = symbol[11] + symbol[12]
for symbolpos in range(1,9):
databits = symbol[symbolpos] + databits
ordered = ordered + databits + ' '
telegrambytes.append(databits)
hexvalue = hexvalue + hex(int(databits, 2)) + ' '
print 'Symbol', symbol, 'Startbit', startbit, 'Databits (LSB first)', databits, 'Paritybit', paritybit, 'Stopbit', stopbit, 'Gap', gap
char =
symbol =
databits =
print 'Full Decoded Frame: ' + ordered + ' hex: ' + hexvalue
print
print telegrambytes[0], ' Control byte'
typeoftelegram = telegrambytes[0][0] + telegrambytes[0][1]
print typeoftelegram, ' ',
if typeoftelegram == '00':
print 'Extended Data Request'
elif typeoftelegram == '10':
print 'Data Request'
elif typeoftelegram == '11':
print 'Poll Data Request'
repeatedtelegram = telegrambytes[0][2]
print ' ', repeatedtelegram,' ',
if repeatedtelegram == '1':
print 'First transmission'
elif repeatedtelegram == '0':
print 'Retransmission'
fixedone = telegrambytes[0][3]
print ' ', fixedone, ' ',
if fixedone == '1':
print 'Fixed 1 - OK'
elif fixedone == '0':
print 'Fixed 1 - Error'
telegrampriority = telegrambytes[0][4] + telegrambytes[0][5]
print ' ', telegrampriority, ' ',
if telegrampriority == '11':
print 'Priority - Low'
elif telegrampriority == '01':
print 'Priority - High'
elif telegrampriority == '10':
print 'Priority - Alarm'
elif telegrampriority == '00':
print 'Priority - System'
fixedzeros = telegrambytes[0][6] + telegrambytes[0][7]
print ' ', fixedzeros, ,
if fixedzeros == '00':
print 'Fixed 00 - OK'
else:
print 'Fixed 00 - Error'
print
print telegrambytes[1], ' Source address - first byte'
area = telegrambytes[1][0] + telegrambytes[1][1] + telegrambytes[1][2] + telegrambytes[1][3]
areai = int(area,2)
print area, ' Area:', areai
line = telegrambytes[1][4] + telegrambytes[1][5] + telegrambytes[1][6] + telegrambytes[1][7]
linei = int(line,2)
print ' ', line, ' Line:', linei
print telegrambytes[2], ' Source address - second byte'
device = telegrambytes[2]
devicei = int(device,2)
print device, ' Device:', devicei
print
print telegrambytes[3], ' Destination address - first byte'
daf = telegrambytes[3][0]
print daf, ' ',
if daf == '0':
print 'Group address'
elif daf == '1':
print 'Physical address'
maingroup = telegrambytes[3][1] + telegrambytes[3][2] + telegrambytes[3][3] + telegrambytes[3][4]
maingroupi = int(maingroup,2)
print , maingroup, ' Main group:', maingroupi
middlegroup = telegrambytes[3][5] + telegrambytes[3][6] + telegrambytes[3][7]
middlegroupi = int(middlegroup,2)
print ' ', middlegroup, ' Middle group:', middlegroupi
print telegrambytes[4], ' Destination address - second byte'
subgroup = telegrambytes[4]
subgroupi = int(subgroup,2)
print subgroup, ' Subgroup:', subgroupi
print
print 'Telegram:', areai, '.', linei, '.', devicei, ' ', maingroupi, '/', middlegroupi, '/', subgroupi
print
else:
print 'ACK / NOACK'
ordered =
decoded = '0'
hexvalue =
telegrambytes = []
else:
num = (samplessincelast + 5) / 10
if num > 1:
for j in range(1,num):
decoded = decoded + '1'
decoded = decoded + '0'
lasti = i
i = i + 1
f.close
