def supports_period_measurement(device_name):
import warnings
with warnings.catch_warnings():
# PyDAQmx warns about a positive return value, but actually this is how you are
# supposed to figure out the size of the array required.
warnings.simplefilter("ignore")
# Pass in null pointer and 0 len to ask for what array size is needed:
npts = daqmx.DAQmxGetDevCISupportedMeasTypes(device_name,
types.int32(), 0)
# Create that array
result = (types.int32 * npts)()
daqmx.DAQmxGetDevCISupportedMeasTypes(device_name, result, npts)
return c.DAQmx_Val_Period in [result[i] for i in range(npts)]
def __init__(self):
# How many samples for each Task()?
self.reads_per_run = 1000
# samples/second
self.sample_rate = 1000
# (min, max) I *think* the NI 6009 only handles 0 to 5.
self.voltages = (0.0, 5.0)
# Holds the sample data
self.raw_data = np.zeros(self.reads_per_run, dtype = np.float64)
# Main task instance. Currently we're creating a new one for each
# read, check if can reuse.
self.task = None
self.dev = 'Dev1/ai0'
self.timeout = 10.0
self.have_read = daqt.int32()
