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floppy-driver-rs

You can find the entire writeup for this project at https://floppy.cafe/

This is a floppy driver written in baremetal rust. It sports a number of methods capable of interfacing with the floppy drive and reading/writing from an IBM formatted floppy disk.

  • fdd.rs: the floppy disk driver
  • mfm.rs: the mfm encoding support functions
  • mfm.S: the lower level mfm encoding functions written in assembly
  • config.rs: pin configurations

This project is built off my own kernel, teensycore.

Wiring

Here is the mapping between the teensy and the direct floppy drive. NOTE If you are using a cable, some pins will be reversed. Please pay careful attention to how the floppy "twist" works. Here's a website detailing the cable twist.

Teensy Pin # Floppy Pin # Function Name
3 8 INDEX
4 12 DRIVE SELECT
5 16 MOTOR ON
6 18 DIRECTION SELECT
7 20 STEP
8 22 WRITE DATA
9 24 WRITE GATE
10 26 TRACK 00
11 28 WRITE PROTECT
12 30 READ DATA
14 32 HEAD SELECT
15 34 READY/DISK CHANGE

Installation

To properly build on a Linux machine, you'll need the following:

# Install build tools
sudo apt-get install build-essential gcc-arm-none-eabi jq

# Configure rust
rustup default nightly
rustup target add thumbv7em-none-eabihf

Building

Run the build script and it will generate file./out/floppy_driver_rs.hex which can be flashed with the teensy loader.

./build.sh

License

MIT

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