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TWIDecode.py
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TWIDecode.py
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# License conditions are given in LICENSE.TXT
# This code is licnesed under the MIT License
# Copyright (c) 2017 Ilialex Research Lab
# www.ilialex.gr, blog.ilialex.gr
#
import unittest
from BusDecode import *
###############################################################################################
# Main Bus Class Decode Functions
###############################################################################################
class TWIDecode(BusDecode):
def f_TWIDecode(self, thrlevel, scl, sda):
self.vcd = []
self.vcdt = []
self.vcdd = []
self.f_SetThresholdType(thrlevel)
self.f_SetEdgeTimeSamples(0)
tsda = self.f_Threshold(sda)
tscl = self.f_Threshold(scl)
escl = self.f_FindEdges(tscl)
esda = self.f_FindEdges(tsda)
cond = self.f_ScanStartStop(tscl, esda)
stream = self.f_Decode(escl, tsda, cond)
bytes = self.f_GetBytes(stream)
self.stream = stream
return bytes
def f_TWIGetStream(self):
return [self.vcd, self.vcdt, self.vcdd]
def f_GetBytes(self, bitstream):
state = 'Start'
byte = 0
line = ""
DevAddr = False
rawbytes = []
self.vcdd = []
for mydata in bitstream:
if state == 'Start':
if mydata == 'S':
state = 'Data'
DevAddr = True
line = "%sS-" %(line)
rot = 0
byte = 0
elif state == 'Data':
if mydata == 1:
byte *= 2
byte += 1
rot += 1
elif mydata == 0:
byte *= 2
byte += 0
rot += 1
elif mydata == 'P':
# stop
line = "%sP\n" %(line)
state = 'Start'
elif mydata == 'S':
# start
line = "%sR-" %(line)
state = 'Data'
DevAddr = True
rot = 0
byte = 0
else:
# unknown input
line = "%s-'%c'" %(line, mydata)
state = 'Start'
rot = 0
byte = 0
if rot == 8:
state = 'AckNack'
elif state == 'AckNack':
if DevAddr == True:
# Translate DevAddr
daddr = byte >> 1
rd = byte & 0x01
if rd == 1:
rd_wr = 'R'
else:
rd_wr = 'W'
notestr = "(%02X %c)" %(daddr, rd_wr)
# restore state
DevAddr = False
else:
notestr = ''
if mydata == 1:
line = "%s%02X%s-N-" %(line, byte, notestr)
elif mydata == 0:
line = "%s%02X%s-A-" %(line, byte, notestr)
rawbytes.append(byte)
self.vcdd.append(byte)
rot = 0
byte = 0
state = 'Data'
elif state == 'Stop':
state = 'Start'
return line, rawbytes
pass
def f_Decode(self, eclk, tdata, cond):
bitstream = []
self.vcd = []
self.vcdt = []
pbit = ''
bidx = 0
bit1idx = 0
for idx in range(0, len(eclk)):
edge = eclk[idx]
data = tdata[idx]
mycond = cond[idx]
if edge == 1:
if data == 0:
bit = 0
elif data == 1:
bit = 1
else:
bit = 'X'
bitstream.append(bit)
# For VCD support find Ack/Nack
bidx += 1
if bit != 'X' and bidx != 9:
pbit = '%d' %bit
if bidx == 1:
bit1idx = idx
elif bidx == 2:
self.vcdt.append(bit1idx)
self.vcd.append('D')
#print idx, pbit
elif bidx == 9:
if bit == 0:
pbit = 'A'
else:
pbit = 'N'
bidx = 0
self.vcdt.append(idx)
self.vcd.append(pbit)
else:
pbit = bit
elif mycond != ' ':
bitstream.append(mycond)
pbit = mycond
# For VCD support
self.vcdt.append(idx)
self.vcd.append(pbit)
if mycond == 'S':
bidx = 0
#print len(self.vcd), len(self.vcdt)
return bitstream
def f_ScanStartStop(self, tclk, edata):
ScanStream = []
for idx in range(0, len(tclk)):
edge = edata[idx]
clk = tclk[idx]
cond = ' '
if clk == 1:
if edge == -1:
cond = 'S'
elif edge == 1:
cond = 'P'
ScanStream.append(cond)
return ScanStream
pass
###############################################################################################
# TDD Unit Test Class and functions
###############################################################################################
class test_basic(unittest.TestCase):
# Test Attribute control
def test_Decode(self):
data = [0, 2.3, 2.4, 0.2, 0.2, 0.2, 2.4, 2.4, 2.4, 2.4, 2.4, 2.4, 0.2, 0.2, 0.2, 0.2, 2.4, 0.2, 2.4, 0.2, 2.4, 0.2, 0.2, 0.2, 2.4,]
clk = [0, 0.2, 2.4, 2.4, 2.4, 0.2, 0.2, 0.2, 2.4, 2.4, 2.4, 0.2, 0.2, 1.5, 2.4, 0.2, 2.4, 0.2, 2.4, 0.2, 2.4, 0.2, 2.4, 2.4, 2.4,]
x=TWIDecode()
x.f_SetThresholdType('LVTTL')
x.f_SetEdgeTimeSamples(0)
tdata = x.f_Threshold(data)
tclk = x.f_Threshold(clk)
eclk = x.f_FindEdges(tclk)
edata = x.f_FindEdges(tdata)
cond = x.f_ScanStartStop(tclk, edata)
v = x.f_Decode(eclk, tdata, cond)
vref = [1, 'S', 1, 0, 1, 1, 1, 0, 'P']
self.assertEqual(vref, v)
def test_ScanStartStop(self):
clk = [2.5, 2.4, 2.5, 0.2, 0.2, 0.2, 2.5, 2.4, 0.2, 0.2, 0.2, 2.4, 2.5, 2.5, 0.2, 0.2, 0.2, 2.4, 0.2, 2.4, 0.2, 2.4, 2.4, 2.4,]
vtclk = [ 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 1, 1, 1,]
vedata = [ 1, -1, 0, 0, 0, 1, 0, 0, -1, 1, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0, 0, 1, 0,]
data = [2.3, 0.2, 0.2, 0.2, 0.3, 2.4, 2.4, 2.4, 0.2, 2.4, 2.4, 2.4, 2.4, 2.4, 2.5, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 2.4, 2.4,]
x=TWIDecode()
x.f_SetThresholdType('LVTTL')
x.f_SetEdgeTimeSamples(0)
tdata = x.f_Threshold(data)
tclk = x.f_Threshold(clk)
edata = x.f_FindEdges(tdata)
self.assertEqual(vedata, edata)
self.assertEqual(vtclk, tclk)
v = x.f_ScanStartStop(tclk, edata)
vref = ['P', 'S', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'P', ' ',]
self.assertEqual(vref, v)
def test_GetSingleByteRdAck(self):
stream = [1, 'S', 1, 0, 1, 1, 1, 0, 0, 1, 0, 'P']
x=TWIDecode()
byte, bytes = x.f_GetBytes(stream)
self.assertEqual("S-B9(5C R)-A-P\n", byte)
def test_GetSingleByteWrAck(self):
stream = [1, 'S', 1, 0, 1, 1, 1, 0, 0, 0, 0, 'P']
x=TWIDecode()
byte, bytes = x.f_GetBytes(stream)
self.assertEqual("S-B8(5C W)-A-P\n", byte)
def test_GetSingleByteRdNAck(self):
stream = [1, 'S', 1, 0, 1, 1, 1, 0, 0, 1, 1, 'P']
x=TWIDecode()
byte, bytes = x.f_GetBytes(stream)
self.assertEqual("S-B9(5C R)-N-P\n", byte)
def test_GetSingleByteWrNAck(self):
stream = [1, 'S', 1, 0, 1, 1, 1, 0, 0, 0, 1, 'P']
x=TWIDecode()
byte, bytes = x.f_GetBytes(stream)
self.assertEqual("S-B8(5C W)-N-P\n", byte)
def test_GetMultiByteRdAck(self):
stream = [1, 'S', 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 'P']
x=TWIDecode()
byte, bytes = x.f_GetBytes(stream)
self.assertEqual("S-B9(5C R)-A-EC-A-P\n", byte)
def test_GetMultiByteWrAck(self):
stream = [1, 'S', 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 'P']
x=TWIDecode()
byte, bytes = x.f_GetBytes(stream)
self.assertEqual("S-B8(5C W)-A-EC-A-P\n", byte)
def test_GetMultiByteNAck(self):
stream = [1, 'S', 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 'P']
x=TWIDecode()
byte, bytes = x.f_GetBytes(stream)
self.assertEqual("S-B9(5C R)-N-EC-A-P\n", byte)
def test_GetMultiByteRdRestartAck(self):
stream = [1, 'S', 1, 0, 1, 1, 1, 0, 0, 1, 0, 'S', 1, 1, 1, 0, 1, 1, 0, 1, 0, 'P']
x=TWIDecode()
byte, bytes = x.f_GetBytes(stream)
self.assertEqual("S-B9(5C R)-A-R-ED(76 R)-A-P\n", byte)
def test_GetMultiByteWrRestartAck(self):
stream = [1, 'S', 1, 0, 1, 1, 1, 0, 0, 1, 0, 'S', 1, 1, 1, 0, 1, 1, 0, 0, 0, 'P']
x=TWIDecode()
byte, bytes = x.f_GetBytes(stream)
self.assertEqual("S-B9(5C R)-A-R-EC(76 W)-A-P\n", byte)
def test_GetMultiByteRestartNAck(self):
stream = [1, 'S', 1, 0, 1, 1, 1, 0, 0, 1, 0, 'S', 1, 1, 1, 0, 1, 1, 0, 0, 1, 'P']
x=TWIDecode()
byte, bytes = x.f_GetBytes(stream)
self.assertEqual("S-B9(5C R)-A-R-EC(76 W)-N-P\n", byte)