The plottest.py and plottest2.py examples demonstrate drawing a graph using the ext-plotgraph extension.
The program plottest.py draws the graphs directly to the screen, whereas the plottest2.py code will render the graphs into a bitmap in RAM_G then display the bitmap afterwards.
The second program is useful for cases where an image may be rendered ahead of time by the BT82x and stored in RAM_G until it is required. This can save a lot of time if bitmap (or any other combinations of display list output) is static and can therefore be drawn once and used mulitple times. the CMD_RENDERTARGET is changed to draw the bitmap and then reverted to the original values when the graphs have been drawn into RAM_G.
The ext-plotgraph extension is loaded with the extplotmem code. This loads the cmd_plotdraw function into the device. To verify the version of the extension loaded and the components the function the loader code for the extplotmem returns a string containing information on the extension code. This is printed on the console when the extension is loaded:
print(extplotmem.loadpatch(eve))
The return message is as follows:
plot6;plot-0.3;mem-0.1;
The name of the extension code is "plot6", it contains the ext-plotgraph extension version "0.3" and the ext-memory extension "0.1".
The format of the command call to run plottest is as follows:
MPSSE example:
python plottest.py --connector ft232h
FT4222 example in single mode (--mode 0):
python plottest.py --connector ft4222module
FT4222 example in dual mode (--mode 1) or quad mode (--mode 2):
python plottest.py --connector ft4222module --mode 2
The example contains a single file which comprises all the demo functionality.
| File/Folder | Description |
|---|---|
| plottest.py | Example source code file |
| plottest2.py | Example source code file |
| extplotmem.py | Snippet source code for memory and graph plotting extension |
| docs | Documentation support files |