Handheld Calculator running on CircuitPython. The hardware is a Keyboard Featherwing V2 from arturo182, an Adafruit Feather M4 Express and a 2000mAh LiPo battery. Circuitpython is a custom build which enables float64 (double) math as well as the cmath module. The supplied patches circuitpython-*.diff should work on 9.0.x and 9.1.x, respectively - the build script automates the build process, and sits on top of Adafruit's build-circuitpython. Make sure you understand this first.
All of this is still very raw but workable.
More information about building this device is here.
The supplied patch implements the following:
- it enables FP64 math on the supported platforms (atmel-samd raspberrypi espressif mimxrt10xx)
- it adds a numerical integration module
ulab.scipy.integrate.
The CIRCUITPY contains the scripts that are supposed to be uploaded to your board.
umath.pyis a wrapper on top of FP64 math and cmath, and transparently invokes numpy.array, float or complex routines for the math functions.uncertainty.pyis a rewrite / port of Python uncertainties to Circuitpython (mainly omitting several dependencies) and works in a very similar way.ufractions.pydoes the same for Python fractions.
Edit the build script 'circuitpython-prep.sh' to prepare the local repo, then run it, then build the desired image.
contains blinka images converted from the C source code.
contains some math on top of jepler-udecimal (https://github.com/jepler/Jepler_CircuitPython_udecimal). umath.py complements hyperbolic and some other functions, and cdmath.py, well, complex decimal math. Abandoned in favor of modifying Circuitpython mainly due to memory consumption but workable. Maybe useful for someone.
The lvgl-micropython patch adds FP64 and numerical integration to the lvgl_micropython fork. It is a direct spinoff of my earlier patch for Circuitpython 9.x.
The images directory contains the images that were originally in the Adafruit Playgound article. It seems I cannot upload them there any more.
Fig. 1 A couple of sample commands.
Fig. 2 View from the backside.
Fig. 3 View from the backside with the Feather M4 removed. You can see the resistors for the voltage divider.
Fig. 4 Some commands enlarged.
Fig. 5 The battery charge current hack.