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