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63 lines
1.7 KiB
Markdown
63 lines
1.7 KiB
Markdown
# Example 7
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This is an example showing how a graph in in Python (not C) can interact with an [OpenModelica](https://openmodelica.org/) model.
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First you need to get the project [AVH-SystemModeling](https://github.com/ARM-software/AVH-SystemModeling) from our ARM-Software repository.
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Then, you need launch `OpenModelica` and choose `Open Model`.
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Select `AVH-SystemModeling/VHTModelicaBlock/ARM/package.mo`
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Then choose `Open Model` again and select `PythonTest.mo`.
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You should see something like that in `Open Modelica`:
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Customize the output path in the `Wave` node.
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Refer to the `Open Modelica` documentation to know who to build and run this simulation. Once it is started in Modelica, launch the Python script in `example7`:
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`python main.py`
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You should see :
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```
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Connecting as INPUT
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Connecting as OUTPUT
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```
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In Modelica window, the simulation should continue to `100%`.
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In the simulation window, you should be able to plot the output wav and get something like:
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A `.wav` should have been generated so that you can listen to the result : A Larsen effect !
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The `Processing` node in the compute graph is implemented in `custom.py` and is a gain computed with `CMSIS-DSP` Python wrapper
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```python
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class Processing(GenericNode):
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def __init__(self,inputSize,outputSize,fifoin,fifoout):
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GenericNode.__init__(self,inputSize,outputSize,fifoin,fifoout)
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def run(self):
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i=self.getReadBuffer()
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o=self.getWriteBuffer()
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b=dsp.arm_scale_q15(i,0x6000,1)
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o[:]=b[:]
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return(0)
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```
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The gain has been chosen to create an instability.
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