def get_adc_devices(config, bus):
'''Return MCP342x devices based on config settings'''
r = {}
sec = 'daemon'
for comp in ('x', 'y', 'z', 'sensor_temperature'):
if config.has_option(sec, comp + '_address'):
if not config.has_option(sec, comp + '_channel'):
raise Exception('Option ' + comp +
'_channel is required in section ' + sec)
address = awn.safe_eval(config.get(sec, comp + '_address'))
channel = awn.safe_eval(config.get(sec, comp + '_channel'))
# Some devices were constructed with single-ended ADC
# boards. Enable a pseudo double-ended mode where IN+ and
# IN- are measured by independed single-ended ADC
# channels.
pseudo_de = False
if hasattr(address, '__iter__') or hasattr(channel, '__iter__'):
if (not hasattr(address, '__iter__') or
not hasattr(channel, '__iter__') or
len(address) != 2 or
len(channel) != 2):
raise Exception('Pseudo double-ended configuration '
+ 'requires two values for both '
+ 'address and channe')
if comp == 'sensor_temperature':
raise Exception('Pseudo double-ended configuration '
+ ' for sensor temperature is '
+ 'not supported')
pseudo_de = True
adc = MCP342x(bus,
address=0,
channel=0,
resolution=18,
gain=1)
for opt in ('resolution', 'gain', 'scale_factor', 'offset'):
if config.has_option(sec, comp + '_' + opt):
v = awn.safe_eval(config.get(sec, comp + '_' + opt))
getattr(adc, 'set_' + opt)(v)
if pseudo_de:
adc.set_address(address[0])
adc.set_channel(channel[0])
adc2 = copy.copy(adc)
adc2.set_address(address[1])
adc2.set_channel(channel[1])
# Offset must be zero otherwise it will be removed later
adc2.set_offset(0)
r[comp + '_ref'] = adc2
else:
adc.set_address(address)
adc.set_channel(channel)
r[comp] = adc
return r
def safe_eval_mull_100(s):
return 100 * awn.safe_eval(s)
# If the argparse type conversion was employed then convert
# back to a string
s = str(s)
logger.debug("value: " + s)
# Parse struct format string into order, quantity, type
pfmt = awn.eeprom.parse_unpack_format(eeprom[k]['format'])
if pfmt[2] == 's' and len(s) > pfmt[1]:
raise Exception('Argument for ' + k + ' too long')
if pfmt[2] in ('c', 's', 'p'):
# String data
data = s
else:
# Convert into numeric data
data = awn.safe_eval(s)
if pfmt[1] > 1 and pfmt[2] != 's':
# Multiple values required
struct.pack_into(eeprom[k]['format'], eeprom_data,
eeprom[k]['address'], *data)
else:
struct.pack_into(eeprom[k]['format'], eeprom_data,
eeprom[k]['address'], data)
eeprom_image_filename = args.file + '.bin'
fh = open(eeprom_image_filename, 'wb')
fh.write(eeprom_data)
fh.close()
print('Wrote ' + str(eeprom_size) + ' bytes to ' + eeprom_image_filename)
# back to a string
s = str(s)
m = re.match('^eeprom_(.*)', k)
if m:
cmd['name'] = 'write_eeprom'
eeprom_setting = m.group(1)
# Parse struct format string into order, quantity, type
pfmt = eeprom.parse_unpack_format( \
eeprom.eeprom[eeprom_setting]['format'])
if pfmt[2] in ('c', 's', 'p'):
# String data
data = s
else:
# Convert into numeric data
data = awn.safe_eval(s)
# Pack data into suitable bytearrays matching the EEPROM layout
if pfmt[1] > 1 and pfmt[2] not in ('s', 'p'):
# Multiple values required
eeprom_data = struct.pack(eeprom.eeprom[eeprom_setting]['format'],
*data)
else:
eeprom_data = struct.pack(eeprom.eeprom[eeprom_setting]['format'],
data)
# Convert the bytewise values into a string, remembering to
# prepend the address
cmd['value'] = str(eeprom.eeprom[eeprom_setting]['address']) + \
',' + ','.join([str(ord(x)) for x in eeprom_data])
else: