def __init__(self,
port=2,
data_rate=None,
host_id=2,
module_id=1,
debug=False,
can_mode=CanModeNormal()):
del data_rate
tmcl_interface.__init__(self, host_id, module_id, debug)
tmcl_host_interface.__init__(self, host_id, module_id, debug)
self.__silent = Pin(Pin.cpu.B14, Pin.OUT_PP)
self.__mode = can_mode
self.__flag_recv = False
self.__set_mode()
CAN.initfilterbanks(14)
self.__can = CAN(port, CAN.NORMAL)
# PCLK1 = 42 MHz, Module_Bitrate = 1000 kBit/s
# With prescaler = 3, bs1 = 11, bs2 = 2
# Sample point at 85.7 %, accuracy = 100 %
self.__can.init(CAN.NORMAL,
prescaler=3,
bs1=11,
bs2=2,
auto_restart=True)
self.__can.setfilter(0, CAN.LIST16, 0,
(host_id, host_id, host_id, host_id))
self.__can.rxcallback(0, self.__callback_recv)
def __init__(self,
port=1,
data_rate=None,
host_id=2,
module_id=1,
debug=False,
can_mode=CanModeNormal()):
del data_rate
tmcl_module_interface.__init__(self, host_id, module_id, debug)
tmcl_host_interface.__init__(self, host_id, module_id, debug)
self.__silent = Pin(Pin.cpu.B10, Pin.OUT_PP)
self.__mode = can_mode
self.__flag_recv = False
self.__can = None
CAN.initfilterbanks(14)
# PCLK1 = 42 MHz, Module_Bitrate = 1000 kBit/s
# With prescaler = 3, bs1 = 11, bs2 = 2
# Sample point at 85.7 %, accuracy = 100 %
if (isinstance(self.__mode, CanModeNormal)):
self.__silent.low()
self.__can = CAN(port, CAN.NORMAL)
self.__can.init(CAN.NORMAL,
prescaler=3,
bs1=11,
bs2=2,
auto_restart=True)
self.__can.setfilter(0, CAN.LIST16, 0,
(host_id, host_id, module_id, module_id))
elif (isinstance(self.__mode, CanModeSilent)):
self.__silent.high()
self.__can = CAN(port, CAN.SILENT)
self.__can.init(CAN.SILENT,
prescaler=3,
bs1=11,
bs2=2,
auto_restart=True)
self.__can.setfilter(0, CAN.LIST16, 0,
(host_id, host_id, module_id, module_id))
elif (isinstance(self.__mode, CanModeOff)):
raise ValueError() # Not supported by TJA1051T/3
self.__can.rxcallback(0, self.__callback_recv)
from pyb import CAN
import pyb
# test we can correctly create by id or name
for bus in (-1, 0, 1, 2, 3, "YA", "YB", "YC"):
try:
CAN(bus, CAN.LOOPBACK)
print("CAN", bus)
except ValueError:
print("ValueError", bus)
CAN.initfilterbanks(14)
can = CAN(1)
print(can)
can.init(CAN.LOOPBACK)
print(can)
print(can.any(0))
# Catch all filter
can.setfilter(0, CAN.MASK16, 0, (0, 0, 0, 0))
can.send('abcd', 123, timeout=5000)
print(can.any(0))
print(can.recv(0))
can.send('abcd', -1, timeout=5000)
print(can.recv(0))
can.send('abcd', 0x7FF + 1, timeout=5000)
print(can.recv(0))
raise SystemExit
from uarray import array
import micropython
import pyb
# test we can correctly create by id (2 handled in can2.py test)
for bus in (-1, 0, 1, 3):
try:
CAN(bus, CAN.LOOPBACK)
print("CAN", bus)
except ValueError:
print("ValueError", bus)
CAN(1).deinit()
CAN.initfilterbanks(14)
can = CAN(1)
print(can)
# Test state when de-init'd
print(can.state() == can.STOPPED)
can.init(CAN.LOOPBACK)
print(can)
print(can.any(0))
# Test state when freshly created
print(can.state() == can.ERROR_ACTIVE)
# Test that restart can be called
can.restart()
class canIf(object):
def __init__(self,canId = 1):
# self._canIf = CAN(1, CAN.NORMAL, extframe=False, prescaler=16, sjw=1, bs1=14, bs2=6)
# self._canIf.setfilter(0, CAN.LIST16, 0, (124, 124, 124, 124))
self._canIf = None
self._canId = canId
self._canAddr = 255
self._rxTimeout = 5
# self._FRM_BYTE = 0x7D
# self._ESC_BYTE = 0x7E
self._txByte = 0
self._rxByte = 0
self._txFrame = 0
self._rxFrame = 0
def bitrate(self, bitrate = 125):
if bitrate == 125:
# 125kpbs, PCLK1@42000000
self._canIf = CAN(self._canId, CAN.NORMAL, extframe=False, prescaler=16, sjw=1, bs1=14, bs2=6)
print('set can speed', bitrate)
elif bitrate == 250:
''' Init for 250 kbps <=> bit time 4 µs. If 42 MHz clk is prescaled by 21, we get 8 subparts 'tq'
of a bit time from theese parts (# tq): sync(1) + bs1(5) + bs2(2) = 8 * tq = 4µs => 250 kbps'''
self._canIf = CAN(self._canId, CAN.NORMAL, extframe=False, prescaler=21, sjw=1, bs1=5, bs2=2)
else:
print('CAN speed not found')
self._canIf.initfilterbanks(1)
return True
def filter(self, address):
canfilterList = []
for x in range(0, 4):
canfilterList.append(address)
# mylist.append(123)
self._canAddr = address
self._canIf.setfilter(0, CAN.LIST16, 0, canfilterList)
print('Filter',self._canAddr)
return True
def any(self):
self._canIf.any(0)
def recv(self):
self._canIf.recv(0)
def send(self, buffer):
# print('canSend',buffer)
result = True
try:
self._canIf.send(buffer, self._canAddr, timeout=100)
self._txByte += len(buffer)
self._txFrame += 1
except:
result = False
print('Failed to Send')
return result
class canIf(object):
def __init__(self, canId=1):
# self._canIf = CAN(1, CAN.NORMAL, extframe=False, prescaler=16, sjw=1, bs1=14, bs2=6)
# self._canIf.setfilter(0, CAN.LIST16, 0, (124, 124, 124, 124))
self._canIf = None
self._canId = canId
self._canAddr = 255
self._rxTimeout = 5
self._FRM_BYTE = 0x7D
self._ESC_BYTE = 0x7E
self._txByte = 0
self._rxByte = 0
self._txFrame = 0
self._rxFrame = 0
def bitrate(self, bitrate=125):
if bitrate == 125:
# 125kpbs, PCLK1@42000000
self._canIf = CAN(self._canId,
CAN.NORMAL,
extframe=False,
prescaler=16,
sjw=1,
bs1=14,
bs2=6)
print('set can speed', bitrate)
elif bitrate == 250:
''' Init for 250 kbps <=> bit time 4 µs. If 42 MHz clk is prescaled by 21, we get 8 subparts 'tq'
of a bit time from theese parts (# tq): sync(1) + bs1(5) + bs2(2) = 8 * tq = 4µs => 250 kbps'''
self._canIf = CAN(self._canId,
CAN.NORMAL,
extframe=False,
prescaler=21,
sjw=1,
bs1=5,
bs2=2)
else:
print('CAN speed not found')
self._canIf.initfilterbanks(1)
return True
def filter(self, address):
canfilterList = []
for x in range(0, 4):
canfilterList.append(address)
# mylist.append(123)
self._canAddr = address
self._canIf.setfilter(0, CAN.LIST16, 0, canfilterList)
print('Filter', self._canAddr)
return True
def buffer(self, buffer=0):
return self._canIf.any(buffer)
def receive(self):
timeout = False
timeoutValue = utime.time() + self._rxTimeout
state = 'INIT'
data = []
if self._canIf.any(0):
print('Data')
while not (timeout):
if self._canIf.any(0):
(id, type, fmi, canframe) = self._canIf.recv(0)
self._rxFrame += 1
for item in canframe:
self._rxByte += 1
# ''' Start Frame '''
if item == self._FRM_BYTE and state in 'INIT':
state = 'RUN'
print(state, item)
# data.append(item)
# ''' End Frame '''
elif item == self._FRM_BYTE and state in 'RUN':
state = 'COMPLET'
print(state, item)
# data.append(item)
return (state, data)
# ''' Stuffin Byte'''
elif item == self._ESC_BYTE and state in 'RUN':
state = 'STUFFING'
print(state, item)
# ''' un-Stuffing'''
elif state in 'STUFFING':
data.append(item ^ 0x20)
state = 'RUN'
print(state, item)
else:
data.append(item)
# ''' Timeout '''
elif utime.time() > timeoutValue:
state = 'TIMEOUT'
timeout = True
return (state, data)
else:
state = 'NODATA'
# print('NoData')
return (state, data)
def transmit(self, data):
size = len(data)
# print('Transmit',size,data)
# self._arrayTx =[]
state = 'INIT'
buffer = array.array('B', [])
buffer.append(self._FRM_BYTE)
state = 'RUN'
length = 0
for item in data:
# print('tt',size,item,len(self._arrayTx))
size = size - 1
# print(len(buffer),item)
if len(buffer) == 8:
# print('test', buffer)
#self._canIf.send(buffer, self._address, timeout=500)
self.canSend(buffer)
buffer = array.array('B', [])
# print('array',len(self._arrayTx))
#print('state', self._state,self._arrayTx)
#if 'INIT' in state:
# buffer.append(self._FRM_BYTE)
# buffer.append(item)
# state = 'RUN'
if 'RUN' in state:
if item in (self._FRM_BYTE, self._ESC_BYTE):
buffer.append(self._ESC_BYTE)
# print(len(buffer),buffer)
if len(buffer) == 8:
# self._canIf.send(buffer, self._address, timeout=500)
self.canSend(buffer)
buffer = array.array('B', [])
buffer.append(item ^ 0x20)
if len(buffer) == 8:
self.canSend(buffer)
buffer = array.array('B', [])
else:
buffer.append(item)
# elif size <= 0:
# print('end')
buffer.append(self._FRM_BYTE)
self.canSend(buffer)
# self._canIf.send(buffer, self._address, timeout=500)
return size
def canSend(self, buffer):
# print('canSend',buffer)
self._canIf.send(buffer, self._canAddr, timeout=500)
self._txByte += len(buffer)
self._txFrame += 1
return True
def maintenance(self):
maint = {}
maint['TX-BYTE'] = self._txByte
maint['RX-BYTE'] = self._rxByte
maint['TX-FRAME'] = self._txFrame
maint['RX-FRAME'] = self._rxFrame
return maint
def txString(self, str):
data = []
for item in str:
#print(item)
data.append(ord(item))
return (self.transmit(data))
def rxString(self):
#print('StringRx')
str = ''
(state, data) = self.receive()
if 'COMPLET' in state:
str = ''.join(chr(i) for i in data)
print('String', str)
return (state, str)
