Pixel Brush Processing Unit

Related tags

Image ProcessingPBPU
Overview

Pixel Brush Processing Unit

The Pixel Brush Processing Unit (PBPU for short) is a simple 4-Bit CPU I designed in Logisim while I was still in school and had nothing better to do during Class.

It's instruction set is thus extremely primitive.

Instruction Set

Mnemonic Inputs Name Description Added with Revision
NOP - No Operation No operation is executed Mk.1
ADD - Add X and Y are added, the result is written to Z Mk.1
SUB - Subtract X and Y are subtracted, the result is written to Z Mk.1
WT1 0-15 Write to Loc11 The given value is written to the upper 4 Bits of the Location Register Mk.1
WT2 0-15 Write to Loc22 The given value is written to the lower 4 Bits of the Location Registern Register Mk.1
WTX 0-15 Write to X The given value is written to the X Register Mk.1
WTY 0-15 Write to Y The given value is written to the Y Register Mk.1
WTZ 0-15 Write to Z The given value is written to the Z Register Mk.1
ZTR - Write Z to RAM The contents of Z are put into the current RAM Location Mk.1
RTZ - Read from RAM to Z The contents of the selected RAM Location are put into the Z Register Mk.1 (Revised in Mk.2)
PC1 0-15 Write to PC13 The given value is written to the upper 4 Bits of the PC4 Register Mk.2
PC2 0-15 Write to PC25 The given value is written to the lower 4 Bits of the PC4 Register Mk.2
JMP - Jump to PC4 Transfers the Contents of the PC4 Register into the actual Program Counter, as long as the Z Register is 0 Mk.2
RTX - Read from RAM to X The contents of the selected RAM Location are put into the X Register Mk.3
RTY - Read from RAM to Y The contents of the selected RAM Location are put into the Y Register Mk.3
USC - Use Carry Toggles the usage of the Carry Bit for the next Arithmetic Operation Mk.3 (Revised in Mk.4)

Assembler

I recently made a custom Assembler in Python for the PBPU Mk.4 according to this Instruction Set.

PBPU Assembler (Tested with Python 3.8)

Simply put your .asm file in as a Command-Line Argument and it should spit out an Assembled .bin file.

Syntax Highlighting for Notepad++

Just seems useful to have when Programming

Examples

There's also a fully commented Program which puts a Smiley on the Mark 2's PPU Screen.

Mark 2 Smiley Program

PBPU Smiley (Assembly)

PBPU Smiley (Binary)

Link to a Video Showcasing this Program on the Mark 2

Addition Program

PBPU Add (Assembly)

PBPU Add (Binary)

Important to remember when Programming

  • You only have 256 Bytes of ROM, so your Program can't be bigger than that without a cheaty workaround
  • Only 256 4-Bit Bytes of RAM (4 of which are reserved for the 4x4 Screen Matrix)
  • Only 4-Bit Math
  • No Input whatsoever (Unless one of the RAM Locations is used for it in some cheaty workaround way)

History

Original Goal

The original Goal was to design a simple, yet functional 4-Bit CPU that could execute simple Programs.

The PBPU had 3 iterations initially: The Mark 1, 2 and 3.

Pre-Mark 1 (3rd of May, 2021)

The first designs of the PBPU already contained the primary 4-Bit registers, X, Y and Z, alongside the Location Register. The 256 Bytes of RAM were also already being considered at this stage.

Mark 1 (3rd of May, 2021)

The Mark 1 was the first functional iteration of the CPU, only boasting the first 9 Instructions. It could only really perform Mathmatical operations and save these to RAM.

Mark 2 (4th of May, 2021)

The Mark 2 expanded on the Mark 1's instruction set, extending it by 4 additional Instructions, meant to add Jumps and Conditionals to aid in the CPU being Turing Complete. However, it unfortunatley failed due to the JMP Command being rather buggy, not even properly checking the Status of the Z Register.

It also saw the introduction of the PBPU's Picture Processing Unit (PPU for short), a simple 4x4 LED Matrix that displayed 4 Bits as a single row of Pixels. Link to a Video Showcasing the Mk.2

Mark 3 (6th of May, 2021)

The last Iteration of the PBPU, the Mark 3, introduced the final 16 instructions, allowing to more easily load values into Registers for more complex operations.

The PPU was also expanded to use an 8x8 Grid, this was however scrapped due to it being too difficult to effectively write to.

Talks of a proper I/O interface came along but these never came to be.

Mark 4 (10th of November, 2021)

The Mark 4 is the latest Revision of the PBPU, meant to finally have it work exactly as intended.

It's still in the early stages of re-learning how a lot of the circuits in the old designs worked, especially due to the switch from Logisim Classic to Logisim Evolution. I also no longer have access to the old Logisim Files, which makes this increasingly difficult.

Update (11th of November, 2021)

The Mark 4 appears to be functional, now supporting all originally inteded features! pbpuMk4Logisim.png It's messy, yes, but that can be worked out in the Mark 5. It also no longer relies on a messy self-built decoder, allowing for each Clock Cycle to run one instruction.

The only currently known "bug" is the need for a NOP at the start of ROM, since the 1st Cylce Instruction is never loaded and executed.

Here's a Diagram to detail how it works pbpumk4.svg

And one that shows how this translates to the Mark 4 pbpumk4.svg

Old Datasheet

This is the Datasheet where I hand-compiled my Programs and came up with all the Instructions (Old) PBPU Datasheet

To-do

  • Refine Assembler to accept relative jumps and calculate offsets
  • Macros to more easily jump

Footnotes

  1. RAM Location 1 (upper 4 bits)

  2. RAM Location 2 (lower 4 bits)

  3. Program Counter 1 (lower 4 bits)

  4. Program Counter 2 3 4

  5. Program Counter 2 (upper 4 bits)

You might also like...
starfish is a Python library for processing images of image-based spatial transcriptomics.
starfish is a Python library for processing images of image-based spatial transcriptomics.

starfish: scalable pipelines for image-based transcriptomics starfish is a Python library for processing images of image-based spatial transcriptomics

GPU-accelerated image processing using cupy and CUDA
GPU-accelerated image processing using cupy and CUDA

napari-cupy-image-processing GPU-accelerated image processing using cupy and CUDA This napari plugin was generated with Cookiecutter using with @napar

image-processing exercises.
image-processing exercises.

image_processing Assignment 21 Checkered Board Create a chess table using numpy and opencv. view: Color Correction Reverse black and white colors with

clesperanto is a graphical user interface for GPU-accelerated image processing.
clesperanto is a graphical user interface for GPU-accelerated image processing.

clesperanto is a graphical user interface for a multi-platform multi-language framework for GPU-accelerated image processing. It is based on napari and the pyclesperanto-prototype.

Simple Python image processing & automatization project for a simple web based game
Simple Python image processing & automatization project for a simple web based game

What is this? Simple Python image processing & automatization project for a simple web based game Made using only Github Copilot (except the color and

Image Processing - Make noise images clean

影像處理-影像降躁化(去躁化) (Image Processing - Make Noise Images Clean) 得力於電腦效能的大幅提升以及GPU的平行運算架構,讓我們能夠更快速且有效地訓練AI,並將AI技術應用於不同領域。本篇將帶給大家的是 「將深度學習應用於影像處理中的影像降躁化 」,

Napari simpleitk image processing
Napari simpleitk image processing

napari-simpleitk-image-processing (n-SimpleITK) Process images using SimpleITK in napari Usage Filters of this napari plugin can be found in the Tools

A small Python module for BMP image processing.

micropython-microbmp A small Python module for BMP image processing. It supports BMP image of 1/2/4/8/24-bit colour depth. Loading supports compressio

An executor that performs standard pre-processing and normalization on images.

An executor that performs standard pre-processing and normalization on images.

Releases(Release)
Owner
Pixel Brush
Pixel Brush
A ray tracing render implemented using Taichi language.

A ray tracing render implemented using Taichi language.

Mingrui Zhang 45 Oct 23, 2022
Script for the creation of metadatas and the randomization of images of MekaVerse

MekaVerse-random Script for the creation of metadata and the randomization of images of MekaVerse Step to replay the random : Create a folder : output

Miinded 8 Sep 07, 2022
Python Program that lets you write in your handwriting!

Handwriting with Python Python Program that lets you write in your handwriting! Inspired by: thaisribeiro.in How to run? Install Unidecode and Pillow

Amanda Rodrigues Vieira 2 Oct 25, 2021
Dynamic image server for web and print

Quru Image Server - dynamic imaging for web and print QIS is a high performance web server for creating and delivering dynamic images. It is ideal for

Quru 84 Jan 03, 2023
Generative Art Synthesizer - a python program that generates python programs that generates generative art

GAS - Generative Art Synthesizer Generative Art Synthesizer - a python program that generates python programs that generates generative art. Examples

Alexey Borsky 43 Dec 03, 2022
Python Interface of P3D

pyp3d 介绍: pyp3d是一个可在python上使用的工具包,它提供了一种可使用python脚本驱动创建模型的方法,为三维建模提供了全新的思路。 pyp3d中定义了一系列建模相关的必要的数据类型,例如球体、圆锥台、四棱锥台、 拉伸体、圆角管等几何体,pyp3d还提供了许多函数来实现放置集合体、

20 Sep 07, 2022
A collection of python scripts which help you programatically create PNGs or GIFs

A collection of python scripts which help you programatically create PNGs or GIFs and their Metadata in bulk with custom rarity rates, upload them to OpenSea & list them for sale.

Tom 30 Dec 24, 2022
Change the image one color channel at a time.

Building-a-Contact-Sheet This hands-on Project is in Python 3 Programming Specialization offered by University of Michigan via Coursera. change the im

Eszter Pai 1 Jan 03, 2022
Simple utility to tinker with OPlus images

OPlus image utilities Prerequisites Linux running kernel 5.4 or up (check with uname -r) Image rebuilding Used to rebuild read-only erofs images into

Wiley Lau 15 Dec 28, 2022
Ascify-Art - An easy to use, GUI based and user-friendly colored ASCII art generator from images!

Ascify-Art This is a python based colored ASCII art generator for free! How to Install? You can download and use the python version if you want, modul

Akash Bora 14 Dec 31, 2022
Django helper application to easily and non-destructively crop arbitrarily large images in admin and frontend.

django-image-cropping django-image-cropping is an app for cropping uploaded images via Django's admin backend using Jcrop. Screenshot: django-image-cr

Jonas und der Wolf GmbH 546 Jan 03, 2023
A functional and efficient python implementation of the 3D version of Maxwell's equations

py-maxwell-fdfd Solving Maxwell's equations via A python implementation of the 3D curl-curl E-field equations. This code contains additional work to e

Nathan Zhao 12 Dec 11, 2022
Anaglyph 3D Converter - A python script that adds a 3D anaglyph style effect to an image using the Pillow image processing package.

Anaglyph 3D Converter - A python script that adds a 3D anaglyph style effect to an image using the Pillow image processing package.

Kizdude 2 Jan 22, 2022
reversable image censoring tool

StupidCensor a REVERSABLE image censoring tool to reversably mosiac censor jpeg files to temporarily remove image details not allowed on most websites

2 Jan 28, 2022
3D Reconstruction Software

Meshroom is a free, open-source 3D Reconstruction Software based on the AliceVision Photogrammetric Computer Vision framework. Learn more details abou

AliceVision 8.7k Jan 02, 2023
A QR Code encode and decode python module

A QR Code encode and decode python module

Fayas Noushad 4 Feb 10, 2022
Open source software for image correlation, distance and analysis

Douglas-Quaid Project Open source software for image correlation, distance and analysis. Strongly related to : Carl-Hauser Problem statement (@CIRCL)

Dominik Dancs 2 May 01, 2022
A simple plugin to view APR images in napari

napari-apr-viewer A simple plugin to view APR images in napari This napari plugin was generated with Cookiecutter using @napari's cookiecutter-napari-

5 Jan 24, 2022
Samila is a generative art generator written in Python

Samila is a generative art generator written in Python, Samila let's you create arts based on many thousand points. The position of every single point is calculated by a formula, which has random par

Sepand Haghighi 947 Dec 30, 2022
ModernGL is a python wrapper over OpenGL 3.3+ core

ModernGL is a python wrapper over OpenGL 3.3+ core that simplifies the creation of simple graphics applications like scientific simulations, games or user interface

ModernGL 1.4k Jan 01, 2023