FPGA-Based Oscilloscope Project

This project implements a simple digital oscilloscope on an FPGA using the Xilinx MicroBlaze soft processor. The oscilloscope is capable of signal acquisition, FFT analysis, touch screen interaction, and visual waveform display on a TFT screen.

Features

• Signal Sampling using FIFO buffers
• Real-Time FFT (Fast Fourier Transform)
• TFT Display output for waveform visualization
• Touch Screen Support for interactive controls (scaling, levels)
• MicroSD Card Support via SPI for data logging
• Frequency and Voltage Level Adjustment
• Modular Design (with separate directories for each functional block)

Directory Structure

Folder/File	Description
CTIIC/	I2C communication support
MicroSD/	MicroSD card access via SPI + FAT16
keys/	Key/button handling
osci/	Oscilloscope signal sampling and FFT
tft/	TFT LCD display control
touch/	Touchscreen driver
helloworld.c	Main application logic and demo
lscript.ld	Linker script for memory layout
platform.c/h	Platform initialization and configuration
platform_config.h	Hardware platform-specific definitions

Requirements

• Xilinx FPGA Board with MicroBlaze soft core
• TFT Display
• Touch Screen Module
• MicroSD Card Slot
• Xilinx SDK or Vitis
• Vivado Design Suite

How It Works

1. Platform Initialization: Sets up interrupt controller, timer, GPIOs, and platform drivers.
2. Signal Capture: Periodic timer ISR triggers sampling logic and FFT computation.
3. Touch UI: Touch events change display scales (time/div, volts/div) and signal levels.
4. Display Output: Waveforms and FFT data are rendered on a TFT screen.
5. MicroSD Logging (Optional): Supports saving data to an SD card using FAT16.

Touchscreen Controls

Gesture / Region Tap	Action
Tap upper Y-scale	Increase vertical scale
Tap lower Y-scale	Decrease vertical scale
Tap upper X-scale	Increase horizontal scale
Tap lower X-scale	Decrease horizontal scale
Tap level up/down	Adjust signal level