https://github.com/gorgonmeducer/embeddednes

A portable NES simulator for embedded processors
https://github.com/gorgonmeducer/embeddednes

6502 cortex-m embedded-processors emulator nes portable-nes-simulator

Last synced: 4 days ago
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A portable NES simulator for embedded processors

• Host: GitHub
• URL: https://github.com/gorgonmeducer/embeddednes
• Owner: GorgonMeducer
• License: apache-2.0
• Created: 2018-03-19T14:36:11.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2021-08-20T17:21:18.000Z (about 4 years ago)
• Last Synced: 2025-03-21T06:51:21.755Z (7 months ago)
• Topics: 6502, cortex-m, embedded-processors, emulator, nes, portable-nes-simulator
• Language: C
• Size: 23.1 MB
• Stars: 38
• Watchers: 6
• Forks: 11
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# EmbeddedNES

A portable NES simulator for embedded processors. 

## Update Log

- 18-05-2018 PPU performance improvement

    * Add buffers for individual sprites

    

    * Clean code, remove unused macro switch, i.e. JEG_USE_DIRTY_MATRIX

- 16-05-2018 Add more default roms

    * Add two default roms

        - ROM1: City Tanks

        - ROM2: Road Fighter

        - ROM3: Super Mario Bro

        - ROM4: Contra (Need implementing new mapper)

- 15-05-2018 Add support for STM32F746G-Discovery

    

    * Add dedicated BSP folders for V2M-MPS2 and STM32F746G-Discovery

    

    * Add dedicated macro switch to disable FILE-IO 

        

        Disable it so you can port and test the NES emulator with default City Tank rom

- 07-05-2008 PPU improvement 

    * Seperate PPU into two versions, one for scanline based and one for partial-scanline based (while another part is pixel based)

    

    * Apply compact dual pixels to background buffer

    

        TODO: Fix debug mode

        

    * Improve the readability

- 05-05-2018 PPU improvement

    

    * Add background buffer for name tables.

    

    * Add Dirty Matrix to background buffer refreshing scheme. Only changed tile will be updated. 

    

    * Add debug mode to show background buffer. 

    

    * Gain > 10% performance improvement.

- 03-05-2018 PPU refactory 

    * Improve the PPU performance and readabiligy. 

    

    * Add dedicated jeg_cfg.h for configuration purpose. 

    

    * Improve the display quality - solve the blinking-sprite issue.

- 20-04-2018 Support both LiteNES and JEG

    

    You can switching two emulator in MDK projects:

    

    * V2M-MPS2-jeg for JEG

        PPU looks good, but 6502 emulation part need to be rewritten. PPU performance could also be improved. 

    * V2M-MPS2-LiteNES.

    

        The performance has been improved. The PPU looks buggy and I decide to not use it any more.

    

   

## How to test it

    

    A MDK (https://www.keil.com/demo/eval/arm.htm) project has been provided:

    

    ./mps2_template/example/build/mdk

    

    No real hardware is required but you need a professional license (which you can request an 7-days evaluation professional license) to run the Fast Model.

    

    After you open the project with MDK:

    

    *  Compile it 

    and 

    *  Press the Debug button. 

    

    A Cortex-M7 Fast Model (a.k.a FVP) will be launched. If you don't see anything happened, please make sure "Models Cortex-M Debugger" is selected in the debugger settings by checking following path:

    

    Menu Project->Options for Target->Debug

    

    All the configuration and settings of FVP should be included in this project. If you find nothing, please let me know.

    

    If you are lucky enough to have a MPS2+ board, then you can debug it on the  real hardware. (Currently, it is extremely slow, I am working on it...)

    

    

    Enjoy.