When samples are all the same, min = max, which PyDAQmx does not like.
This avoids the following crash reported by Kathie:
C:\Users\rabi\artiq\artiq\frontend [master]> python .\artiq_rpctool.py ::1 3256
call load_sample_values 100000 'np.array([0.0,0.0],dtype=float)'
Traceback (most recent call last):
File ".\artiq_rpctool.py", line 112, in <module>
main()
File ".\artiq_rpctool.py", line 107, in main
call_method(remote, args.method, args.args)
File ".\artiq_rpctool.py", line 79, in call_method
ret = method(*[eval(arg) for arg in args])
File "C:\Users\rabi\AppData\Local\Continuum\Anaconda3\lib\site-packages\artiq-
0.0+dev-py3.4.egg\artiq\protocols\pc_rpc.py", line 142, in proxy
return self.__do_rpc(name, args, kwargs)
File "C:\Users\rabi\AppData\Local\Continuum\Anaconda3\lib\site-packages\artiq-
0.0+dev-py3.4.egg\artiq\protocols\pc_rpc.py", line 134, in __do_rpc
return self.__do_action(obj)
File "C:\Users\rabi\AppData\Local\Continuum\Anaconda3\lib\site-packages\artiq-
0.0+dev-py3.4.egg\artiq\protocols\pc_rpc.py", line 128, in __do_action
raise RemoteError(obj["message"])
artiq.protocols.pc_rpc.RemoteError: Traceback (most recent call last):
File "C:\Users\rabi\AppData\Local\Continuum\Anaconda3\lib\site-packages\artiq-
0.0+dev-py3.4.egg\artiq\protocols\pc_rpc.py", line 476, in _handle_connection_cr
ret = method(*obj["args"], **obj["kwargs"])
File "C:\Users\rabi\AppData\Local\Continuum\Anaconda3\lib\site-packages\artiq-
0.0+dev-py3.4.egg\artiq\devices\pxi6733\driver.py", line 117, in load_sample_val
ues
byref(num_samps_written), None)
File "<string>", line 3, in WriteAnalogF64
File "<string>", line 2, in function
File "C:\Users\rabi\AppData\Local\Continuum\Anaconda3\lib\site-packages\pydaqm
x-1.3.1-py3.4.egg\PyDAQmx\DAQmxFunctions.py", line 28, in mafunction
raise DAQError(error,errBuff.value.decode("utf-8"), f.__name__)
PyDAQmx.DAQmxFunctions.DAQError: Minimum is greater than or equal to the maximum
. Ensure the maximum value is greater than the minimum value. If using a custom
scale, ensure that the scaled maximum is greater than the scaled minimum.
Property: DAQmx_AO_Min
Corresponding Value: 0.0
Property: DAQmx_AO_Max
Corresponding Value: 0.0
Channel Name: Dev1/ao1
Task Name: _unnamedTask<4>
Status Code: -200082
in function DAQmxWriteAnalogF64
Once the Sequencer ack's a line, the Parser starts preparing the
next one. This includes jumping through the frame table if necessary.
To stall the Parser while the Sequencer executes the last line of a
frame and to ensure that the frame select lines can be set up and their
sampling is synchronized to a trigger, we add a triggered stall line
at the end of the frame.
When that line is triggered the Parser jumps through the table and starts
parsing the first line of the next frame. We let the duration of this
last stall line be 10 cycles (200ns@50MHz) to be able to distinguish this
sampling of the frame select lines from the triggering of the first line
in the next frame.
frame f
parser n f 0
stb __---________---___
trigger ___----_______----_
ack ____-__________-___
sequencer n-1 n 0
* "trigger" now means that the corresponding line will only start
once the trigger line is high.
* "jump" is implicit as the last line in a frame must jump back.
* spline coefficients are now compensated for finite time step size
