Haawking RISC-V DSP Guitar Multi-Effect

This repo is a guitar multi-effect based on Haawking HXS320F28034 DSP based on RISC-V RV32 architecture.

Effects include:

• distortion
• reverb
• delay
• high pass
• low pass
• mid pass
• tuner implemented by fft (also implemented by dft)

Features and Usage

• The effects are based on ring-bus up to 1 second of sample buffer, which enables multiple effects working together.
• After each ADC interrupt, the buffer will be refreshed and effects will take place to refresh the buffer.
• The output is in the form of PWM signal. To produce normal sin waves, filter is required. A basic RC filter will suffice.
• To turn on each effect, simply add the effect to the loop. It works the same as a normal multi-effect.

Note

• This project is a prototype, under development.
• Tuner is not very accurate due to limited capacity of RAM.
• This project will be updated when new generation of chips with larger ram and I2S output are available.