def _read(self):
dallas = self.parent
dallas.reset()
dallas.matchrom(self.address)
dallas.readscratch()
result = dallas.readbytes(9)
if crc_of(result) == 0:
t = unpack('<h', result[:2])[0]
self.result = t
if self.bad_crc_count > 10: #was logged as bad
msglog.log('DallasBus', 'information', 'Resumed: %s' % \
as_node_url(self))
self.bad_crc_count = 0
t = uptime_secs()
self.scan_period = t - self._last_read_time
self._last_read_time = t
if self.debug:
print "TEMPERATURE SENSOR: _read value", self.result
else:
if self.bad_crc_count < 11:
self.bad_crc_count += 1
if self.bad_crc_count == 10:
self.result = None #return ETimeout to gets
raise EInvalidResponse('Failed read ten times: %s' % \
as_node_url(self))
if self.debug:
print "TEMPERATURE SENSOR: BAD CRC", result
return
def _read(self):
dallas = self.parent
dallas.reset()
dallas.matchrom(self.address)
dallas.readscratch()
result = dallas.readbytes(9)
if crc_of(result) == 0:
t = unpack('<h', result[:2])[0]
self.result = t
if self.bad_crc_count > 10: #was logged as bad
msglog.log('DallasBus', 'information', 'Resumed: %s' % \
as_node_url(self))
self.bad_crc_count = 0
t = uptime_secs()
self.scan_period = t - self._last_read_time
self._last_read_time = t
if self.debug:
print "TEMPERATURE SENSOR: _read value", self.result
else:
if self.bad_crc_count < 11:
self.bad_crc_count += 1
if self.bad_crc_count == 10:
self.result = None #return ETimeout to gets
raise EInvalidResponse('Failed read ten times: %s' % \
as_node_url(self))
if self.debug:
print "TEMPERATURE SENSOR: BAD CRC", result
return
def asciihex_to_address(value):
# There may be a much easier way to do this.
nibble_map = {'0':0, '1':1, '2':2, '3':3, '4':4,
'5':5, '6':6, '7':7, '8':8, '9':9,
'a':10, 'b':11, 'c':12, 'd':13, 'e':14, 'f':15,
'A':10, 'B':11, 'C':12, 'D':13, 'E':14, 'F':15}
addr = ''
for i in range(0,len(value),2):
addr += chr((nibble_map[value[i]] << 4) +
nibble_map[value[i+1]])
if crc_of(addr) != 0:
# CRC does not pass, try the reverse byte order instead
addr = ''
for i in range(len(value),0,-2):
addr += chr((nibble_map[value[i-2]] << 4) +
nibble_map[value[i-1]])
return addr
def asciihex_to_address(value):
# There may be a much easier way to do this.
nibble_map = {
'0': 0,
'1': 1,
'2': 2,
'3': 3,
'4': 4,
'5': 5,
'6': 6,
'7': 7,
'8': 8,
'9': 9,
'a': 10,
'b': 11,
'c': 12,
'd': 13,
'e': 14,
'f': 15,
'A': 10,
'B': 11,
'C': 12,
'D': 13,
'E': 14,
'F': 15
}
addr = ''
for i in range(0, len(value), 2):
addr += chr((nibble_map[value[i]] << 4) + nibble_map[value[i + 1]])
if crc_of(addr) != 0:
# CRC does not pass, try the reverse byte order instead
addr = ''
for i in range(len(value), 0, -2):
addr += chr((nibble_map[value[i - 2]] << 4) +
nibble_map[value[i - 1]])
return addr