floopy 0.1.2

Tester-Agnostic Sequencer for Hardware-Testing in Python

Tester-Agnostic Sequencer for Hardware-Testing in Python

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Tests

• ... can performed within different test-environments
• ... can organized in hierarchical layers with (sub-) tasks
• ... can have setup, task/test, teardown, final and output functions
• Every variable
  • ... has an unique namespace
  • ... is stored as a time-signal with timestamps
  • ... can be sub-classed
• Data dependencies between functions are resolved by a graph-based approach
• Auto-Save for loop-recovery and post-processing (experimental)
• Can handle non-reentrant tests by an extra extension (unpublished)

Loops

• Flexible loop configuration (nested, zipped, concatenated)
• Standard loops: loop_items, loop_lin, loop_log, loop_bisect
• Feedback for HiL possible

Getting Started

Suppose we want to test if the internal resistance of an battery rbat is inside the test-limits:

• The test-environment is abstracted by the namespace of the dut input and must be specified later, just before running the test-case.
• The loop over the load current i_load can be either configured locally inside the test-case or later, just before running the test-case.

Test-Case

import floopy as fly


class Test_Rbat_Charged(fly.Task):
    dut = fly.Input()  # object to stimulate device-under-test and measure response
   
    i_load = fly.Input(min=0, max=1.5, unit='A', default=fly.loop_lin(num=3))
    
    def task(dut, i_load):
        dut.current = i_load
        return dut.voltage

    def final_fit(i=fly.Squeeze(task.i_load), v=fly.Squeeze(task)):
        import numpy as np
        return np.polyfit(i, v, deg=1)
        
    @fly.Output(min=0, ltl=0.2, utl=2, max=10, unit='ohm')
    def rbat(coeffs=final_fit):
        return coeffs[0]

Test-Plan

Now, the test-case Test_Rbat_Charged can be used with different loop-configurations and within different test-environments. For demonstration we just use the simple resistor equation as a simulation-environment.

class TestPlan_BatterCheck(fly.Task):
    def dut():
        class Dut:
            @property
            def voltage(self):
                resistance = 0.8  # ohm
                return resistance * self.current
        return Dut()

    test_rbat_charged = Test_Rbat_Charged(dut, i_load=fly.loop_log(0.1, 1, num=5))

Note, that we changed the default loop-configuration of i_load to a logarithmic scaling.

In order to perform the Test-Plan we need a DataManager saving all loop-states and measurement results as time-signals in a json-file.

>>> dm = fly.DataManager()
>>> dm.run_live(TestPlan_BatterCheck)

╭─ TestPlan_BatterCheck ─╮
│  ✔  test_rbat_charged  │
╰────────────────────────╯
File: dm/dm_2024-10-10_16:00:29.json

The test results and all variables can be analyzed via pandas-tables.

>>> dm.read_task(TestPlan_BatterCheck)

test_rbat_charged
rbat	check
0.8	True

>>> tp = TestPlan_BatterCheck()
>>> dm.read_task(tp.test_rbat_charged.task)

	i_load	__return__
TestPlan_BatterCheck.test_rbat_charged.i_load
0.100000	0.100000	0.080000
0.177828	0.177828	0.142262
0.316228	0.316228	0.252982
0.562341	0.562341	0.449873
1.000000	1.000000	0.800000

For a real measurement we leave the test-case unchanged and just need to replace the dut function in the test-plan with something like

def dut():
    import instruments
    dut = instruments.PowerSupply()
    return dut

assuming an equal namespace

dut.voltage
dut.current

with an equal behavior.

Further information can be found in the FLooPy-Tutorial which is more detailed.

Install

Simply do either

pip install floopy

or download the repository for a more recent version, change into the floopy folder and

pip install . --user

If necessary you can run the tests with

python -m pytest

Licence

LoopyPlot is licenced under GPL 3.