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