This repo contains the source code for a chromatic tuner on the Nexys A7 FPGA board. It is able to distingunish tones between 40Hz-7000Hz with <1 Hz accuracy. The UI is fully responsive.
Contained within the code is a fixed-width FFT implementation modified from here.
/io contains code that interacts with low-level hardware directly,
including LCD.
/virtio handles encoder rotation direction, button debouncing,
FFT, and provides several timer wrapper classes.
To recognize tones as accurate as possible, this program allocates a lot of stack and heap space for fixed-width FFT.
At least 16 MB of stack and 4MB of heap is recommended.