Pi Day 2022

A Pi Day project for the AT90USB162 which calculates hexadecimal digits of pi and displays them in binary on LEDs. More info at fency.fun.

Note: I am far from a C expert so this is not model C code.

Files

• pi.c: Contains the actual digit calculating code to be used by other files.

• main.c: Contains AVR code which uses pi.c to calculate digits.

• test.c: Code which can be executed directly in a terminal (not loaded onto the microcontroller) to verify the digits produced by the pi.c.

• USB directory: Contains AVR + LUFA code which sends digits via USB serial instead of displaying them with LEDs.

Prerequisites

Compiling anything for the AT90USB162 requires avr-gcc, avr-objcopy, avr-size and dfu-programmer.

Dissasembling requires avr-obj-dump.

Compiling the USB version requires LUFA. The path to it needs to be updated in USB/Makefile.

Compiling

• make main: Compile the main code into main.hex, which can be loaded onto the microcontroller.

• make test: Compile test.c to test.out.

• make usb: Compile the contents of USB, producing usb.hex, which can be loaded onto the microcontroller.

Flashing

• make load: Compile main.hex and flash it onto the microcontroller.

• make load-usb: Compile usb.hex and flash it onto the microcontroller.