def test_ValidAccuraciesAreAccepted(self):
try:
PiADCInput([0], 12)
PiADCInput([0], 14)
PiADCInput([0], 16)
PiADCInput([0], 18)
except ValueError:
self.fail("Valid Accuracies should be allowed")
def test_ADCConfigMethodReturnsCorrectConfigMask(self):
lookup_table = [(0, 12, 0x90), (0, 14, 0x94), (0, 16, 0x98), (0, 18, 0x9C),
(1, 12, 0xB0), (1, 14, 0xB4), (1, 16, 0xB8), (1, 18, 0xBC),
(2, 12, 0xD0), (2, 14, 0xD4), (2, 16, 0xD8), (2, 18, 0xDC),
(3, 12, 0xF0), (3, 14, 0xF4), (3, 16, 0xF8), (3, 18, 0xFC)]
for i in range(0,2):
for j in lookup_table:
adc = PiADCInput([0], j[1])
self.assertEqual(j[2], adc._adcConfig(4*i + j[0])[1])
def _createADCSampler(self):
# Need to prepare the config
self.logger.info("Creating the ADC sampler")
accuracy = self._config['input_accuracy']
channels = []
for input_config in self._config['input']:
channels.append(input_config['pin'])
self.logger.info(('Channel list', channels))
self._piADCInput = PiADCInput(channels, accuracy)
def test_ADCConfigMethodReturnsCorrectConfigMask(self):
lookup_table = [(0, 12, 0x90), (0, 14, 0x94), (0, 16, 0x98),
(0, 18, 0x9C), (1, 12, 0xB0), (1, 14, 0xB4),
(1, 16, 0xB8), (1, 18, 0xBC), (2, 12, 0xD0),
(2, 14, 0xD4), (2, 16, 0xD8), (2, 18, 0xDC),
(3, 12, 0xF0), (3, 14, 0xF4), (3, 16, 0xF8),
(3, 18, 0xFC)]
for i in range(0, 2):
for j in lookup_table:
adc = PiADCInput([0], j[1])
self.assertEqual(j[2], adc._adcConfig(4 * i + j[0])[1])
def _createADCSampler(self):
# Need to prepare the config
self.logger.info("Creating the ADC sampler")
accuracy = self._config['input_accuracy']
channels = []
for input_config in self._config['input']:
channels.append(input_config['pin'])
self.logger.info(('Channel list', channels))
self._piADCInput = PiADCInput(channels, accuracy)
class GPIODataSampleReader(SampleReader):
'''
This implementation will read samples from the GPIO for the Pi-ADC
'''
def __init__(self, configuration):
self.logger = logging.getLogger(__name__)
self._config = configuration
self._createADCSampler()
def _createADCSampler(self):
# Need to prepare the config
self.logger.info("Creating the ADC sampler")
accuracy = self._config['input_accuracy']
channels = []
for input_config in self._config['input']:
channels.append(input_config['pin'])
self.logger.info(('Channel list', channels))
self._piADCInput = PiADCInput(channels, accuracy)
def read_sample(self):
samples = self._piADCInput.getSamples()
self.logger.info(("Samples: ", samples))
# Need to create data points of the correct form
datapoints = list()
for channel in samples:
# Need to find the relevant line in the config
cfg = self._input_config_for_channel(channel)
# And now create the data point
dp = dict()
dp['timestamp'] = time.time()
dp['raw_value'] = samples[channel]
dp['sensor_id'] = cfg['id']
dp['type'] = cfg['type']
datapoints.append(dp)
return datapoints
def _input_config_for_channel(self, channel):
pins = map(lambda x: x['pin'], self._config['input'])
try:
idx = list(pins).index(channel)
except:
print("problem")
return self._config['input'][idx]
class GPIODataSampleReader(SampleReader):
'''
This implementation will read samples from the GPIO for the Pi-ADC
'''
def __init__(self, configuration):
self.logger = logging.getLogger(__name__)
self._config = configuration
self._createADCSampler()
def _createADCSampler(self):
# Need to prepare the config
self.logger.info("Creating the ADC sampler")
accuracy = self._config['input_accuracy']
channels = []
for input_config in self._config['input']:
channels.append(input_config['pin'])
self.logger.info(('Channel list', channels))
self._piADCInput = PiADCInput(channels, accuracy)
def read_sample(self):
samples = self._piADCInput.getSamples()
self.logger.info(("Samples: ", samples))
# Need to create data points of the correct form
datapoints = list()
for channel in samples:
# Need to find the relevant line in the config
cfg = self._input_config_for_channel(channel)
# And now create the data point
dp = dict()
dp['timestamp'] = time.time()
dp['raw_value'] = samples[channel]
dp['sensor_id'] = cfg['id']
dp['type'] = cfg['type']
datapoints.append(dp)
return datapoints
def _input_config_for_channel(self, channel):
pins = map(lambda x : x['pin'], self._config['input'])
try:
idx = list(pins).index(channel)
except:
print("problem")
return self._config['input'][idx]
def test_ADCConfigMethodReturnsCorrectAddresses(self):
lookup_table = [0x68, 0x68, 0x68, 0x68, 0x69, 0x69, 0x69, 0x69]
adc = PiADCInput([0], 12)
for i in range(0, len(lookup_table)):
self.assertEqual(lookup_table[i], adc._adcConfig(i)[0])
def test_DivisorMethodWorksCorrectly(self):
lookup_table = [(12, 1), (14, 4), (16, 16), (18, 64)]
for kv in lookup_table:
adc = PiADCInput([0], kv[0])
self.assertEqual(kv[1], adc._divisor())
def test_ValidChannelsAreAccepted(self):
try:
PiADCInput([0, 1, 2, 3, 4, 5, 6, 7], 12)
PiADCInput([3], 12)
except ValueError:
self.fail("Valid channels should be accepted")
def test_ADCConfigMethodReturnsCorrectAddresses(self):
lookup_table = [0x68, 0x68, 0x68, 0x68, 0x69, 0x69, 0x69, 0x69]
adc = PiADCInput([0], 12)
for i in range(0, len(lookup_table)):
self.assertEqual(lookup_table[i], adc._adcConfig(i)[0])
def test_DivisorMethodWorksCorrectly(self):
lookup_table = [(12, 1), (14, 4), (16, 16), (18, 64)]
for kv in lookup_table:
adc = PiADCInput([0], kv[0])
self.assertEqual(kv[1], adc._divisor())