def sample(self):
try:
self.obtain_lock()
self._spi.open()
# command...
self.__cmd(self.__CMD_READ_HISTOGRAM)
chars = self.__read_bytes(62)
# time...
rec = LocalizedDatetime.now()
# bins...
bins = [Decode.unsigned_int(chars[i:i + 2], '<') for i in range(0, 32, 2)]
# bin MToFs...
bin_1_mtof = chars[32]
bin_3_mtof = chars[33]
bin_5_mtof = chars[34]
bin_7_mtof = chars[35]
# period...
period = Decode.float(chars[44:48], '<')
# checksum...
required = Decode.unsigned_int(chars[48:50], '<')
actual = sum(bins) % 65536
if required != actual:
raise ValueError("bad checksum: required: 0x%04x actual: 0x%04x" % (required, actual))
# PMx...
try:
pm1 = Decode.float(chars[50:54], '<')
except TypeError:
pm1 = None
try:
pm2p5 = Decode.float(chars[54:58], '<')
except TypeError:
pm2p5 = None
try:
pm10 = Decode.float(chars[58:62], '<')
except TypeError:
pm10 = None
return OPCDatum(self.SOURCE, rec, pm1, pm2p5, pm10, period, bins,
bin_1_mtof, bin_3_mtof, bin_5_mtof, bin_7_mtof)
finally:
self._spi.close()
self.release_lock()
def measure_raw(self):
try:
self.obtain_lock()
cmd = SPINDIRx1Cmd.find('mr')
response = self._transact(cmd)
pile_ref_value = Decode.unsigned_int(response[0:2], '<')
pile_act_value = Decode.unsigned_int(response[2:4], '<')
thermistor_value = Decode.unsigned_int(response[4:6], '<')
return pile_ref_value, pile_act_value, thermistor_value
finally:
self.release_lock()
def __write_and_verify_reg(self, reg, value):
read_value = None
try:
I2C.Utilities.start_tx(self.__ADDR)
for _ in range(3):
# write...
I2C.Utilities.write_addr(reg, value & 0x00ff, value >> 8)
time.sleep(0.001)
# read...
read_bytes = I2C.Utilities.read_cmd(reg, 2)
time.sleep(0.001)
read_value = Decode.unsigned_int(read_bytes, '<')
if read_value == value:
return
raise RuntimeError("reg:0x%02x value:0x%04x got:0x%04x" %
(reg, value, read_value))
finally:
I2C.Utilities.end_tx()
def get_sample_raw(self):
try:
self.obtain_lock()
# report...
cmd = SPINDIRx1Cmd.find('sr')
response = self._transact(cmd)
pile_ref_amplitude = Decode.unsigned_int(response[0:2], '<')
pile_act_amplitude = Decode.unsigned_int(response[2:4], '<')
thermistor_average = Decode.unsigned_int(response[4:6], '<')
return pile_ref_amplitude, pile_act_amplitude, thermistor_average
finally:
self.release_lock()
def _calib_r_unsigned_int(self, block, index):
cmd = SPINDIRx1Cmd.find('cr')
cmd.return_count = 2
response = self._transact(cmd, (block, index))
value = Decode.unsigned_int(response, '<')
return value
def get_sample_offsets(self):
try:
self.obtain_lock()
# report...
cmd = SPINDIRx1Cmd.find('so')
response = self._transact(cmd)
min_ref_offset = Decode.unsigned_int(response[0:2], '<')
min_act_offset = Decode.unsigned_int(response[2:4], '<')
max_ref_offset = Decode.unsigned_int(response[4:6], '<')
max_act_offset = Decode.unsigned_int(response[6:8], '<')
return min_ref_offset, min_act_offset, max_ref_offset, max_act_offset
finally:
self.release_lock()
def __read_int(self):
read_bytes = []
for _ in range(2):
time.sleep(OPCN2.__TRANSFER_DELAY)
read_bytes.extend(self.__spi.read_bytes(1))
return Decode.unsigned_int(read_bytes)
def input_raw(self):
try:
self.obtain_lock()
cmd = SPINDIRx1Cmd.find('ir')
response = self._transact(cmd)
v_in_value = Decode.unsigned_int(response, '<')
return v_in_value
finally:
self.release_lock()
def __read_reg(self, reg, signed=False):
try:
I2C.Utilities.start_tx(self.__ADDR)
read_bytes = I2C.Utilities.read_cmd(reg, 2)
time.sleep(0.001)
return Decode.int(read_bytes,
'<') if signed else Decode.unsigned_int(
read_bytes, '<')
finally:
I2C.Utilities.end_tx()
def record_raw(self, deferral, interval, count):
try:
self.obtain_lock()
# start recording...
deferral_bytes = Encode.unsigned_int(deferral, '<')
interval_bytes = Encode.unsigned_int(interval, '<')
count_bytes = Encode.unsigned_int(count, '<')
param_bytes = []
param_bytes.extend(deferral_bytes)
param_bytes.extend(interval_bytes)
param_bytes.extend(count_bytes)
cmd = SPINDIRt1f1Cmd.find('rs')
self._transact(cmd, param_bytes)
# wait...
lamp_period = self._calib_r_unsigned_int(
0, NDIRCalib.INDEX_LAMP_PERIOD)
execution_time = (lamp_period + deferral +
(interval * count)) / 1000
time.sleep(execution_time)
# playback...
cmd = SPINDIRt1f1Cmd.find('rp')
cmd.return_count = count * 10
response = self._transact(cmd)
values = []
for i in range(0, cmd.return_count, 10):
timestamp = Decode.unsigned_int(response[i:i + 2], '<')
pile_ref = Decode.long(response[i + 2:i + 6], '<')
pile_act = Decode.long(response[i + 6:i + 10], '<')
values.append((timestamp, pile_ref, pile_act))
return values
finally:
self.release_lock()
def record_raw(self, deferral, interval, count):
try:
self.obtain_lock()
# start recording...
deferral_bytes = Encode.unsigned_int(deferral, '<')
interval_bytes = Encode.unsigned_int(interval, '<')
count_bytes = Encode.unsigned_int(count, '<')
param_bytes = []
param_bytes.extend(deferral_bytes)
param_bytes.extend(interval_bytes)
param_bytes.extend(count_bytes)
cmd = SPINDIRx1Cmd.find('rs')
self._transact(cmd, param_bytes)
# wait...
execution_time = cmd.execution_time + ((
(interval * count) + deferral) / 1000)
# print("execution time: %s" % execution_time, file=sys.stderr)
time.sleep(execution_time)
# playback...
cmd = SPINDIRx1Cmd.find('rp')
cmd.return_count = count * 10
response = self._transact(cmd)
values = []
for i in range(0, cmd.return_count, 10):
timestamp = Decode.unsigned_int(response[i:i + 2], '<')
pile_ref = Decode.long(response[i + 2:i + 6], '<')
pile_act = Decode.long(response[i + 6:i + 10], '<')
values.append((timestamp, pile_ref, pile_act))
return values
finally:
self.release_lock()
def sample(self):
try:
self.obtain_lock()
self._spi.open()
# command...
self.__cmd(self.__CMD_READ_HISTOGRAM)
chars = self.__read_bytes(86)
# checksum...
required = Decode.unsigned_int(chars[84:86], '<')
actual = ModbusCRC.compute(chars[:84])
if required != actual:
raise ValueError(
"bad checksum: required: 0x%04x actual: 0x%04x" %
(required, actual))
# time...
rec = LocalizedDatetime.now()
# bins...
bins = [
Decode.unsigned_int(chars[i:i + 2], '<')
for i in range(0, 48, 2)
]
# bin MToFs...
bin_1_mtof = chars[48]
bin_3_mtof = chars[49]
bin_5_mtof = chars[50]
bin_7_mtof = chars[51]
# period...
raw_period = Decode.unsigned_int(chars[52:54], '<')
period = round(float(raw_period) / 100.0, 3)
# temperature & humidity
raw_temp = Decode.unsigned_int(chars[56:58], '<')
raw_humid = Decode.unsigned_int(chars[58:60], '<')
sht = SHTDatum(SHT31.humid(raw_humid), SHT31.temp(raw_temp))
# PMx...
try:
pm1 = Decode.float(chars[60:64], '<')
except TypeError:
pm1 = None
try:
pm2p5 = Decode.float(chars[64:68], '<')
except TypeError:
pm2p5 = None
try:
pm10 = Decode.float(chars[68:72], '<')
except TypeError:
pm10 = None
return OPCDatum(self.SOURCE, rec, pm1, pm2p5, pm10, period, bins,
bin_1_mtof, bin_3_mtof, bin_5_mtof, bin_7_mtof,
sht)
finally:
self._spi.close()
self.release_lock()
def sample(self):
byte_values = self.__convert()
code = Decode.unsigned_int(byte_values, '>')
v = code * self.__CONV
return round(v, 1)