Quintus Draco
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Quintus Draco
Lovebyte 2023
Mecrisp
Matthias Koch
m-atthias@users.sf.net
http://mecrisp.sourceforge.net/
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A moving dragon fractal running in 56 bytes on a RISC-V microcontroller,
using two DAC channels for vector graphics on an analog oscilloscope.
Quintus Draco is designed for GD32VF103 microcontrollers and
draws vector graphics on an analog oscilloscope in XY mode
connected to
GND and the two DAC channels on pins
PA4 (vertical) and
PA5 (horizontal).
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Design ideas:
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This is a RISC-V port of Draakje 15b, released during Lovebyte 2022.
It draws a dragon fractal, moves the viewport every time the x coordinate
hits zero and may serve as example framework for vector graphics on GD32VF103.
The algorithm is included as dragon.c for further experiments. Quality
of the randomness determines how dense the dragon is drawn, the size
can be controlled by changing the shift amount.
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How to run:
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If you have connected your
Longan Nano board to
a USB-serial cable with 3.3V logic levels
3V3 or 5V -- VCC (measure the voltage present here)
R0 -- TXD
T0 -- RXD
GND -- GND
you can flash it if you first
* Press and hold BOOT0 button
* Press and release Reset button
* Release BOOT0 button
and then execute
stm32loader -e -w -v -p /dev/ttyUSB0 quintus-draco.bin
on your host machine.
Press and release Reset button to start demo.
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Credits:
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* Inspiration:
Draakje 15b by HellMood/Desire, Lovebyte 2022
https://www.pouet.net/prod.php?which=91104
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