FPGA Learning

This repository documents my journey in learning FPGA development using VHDL.

Project Structure

• common/: Shared VHDL components and packages.
• docs/: Documentation and datasheets.
• lessons/: Step-by-step learning projects.
  • 01_led/: Basic LED control and switch input.
  • 02_sev_seg_count/: 4-digit decimal counter with 7-segment display.
  • 03_buzzer/: Passive buzzer control (PWM/Tones).
  • 04_uart/: serial communication with PC (Loopback).
  • 05_vga/: VGA controller (640x480 Color Bars).
  • 06_ps2_keyboard/: PS/2 Keyboard decoder.
  • 07_lm75_temp/: Digital Thermometer (I2C LM75 Sensor).
  • 08_bouncing_ball/: VGA Bouncing Ball Game (Physics Demo).
• scripts/: Helper scripts for building and simulation.

Resources

• Development Board Schematic

Board Layout & Pinout

graph TD
    subgraph Laptop [Development Laptop]
        Terminal["Serial Terminal<br/>(Minicom/PuTTY)"]
        Quartus["Quartus Prime<br/>(Programmer)"]
    end

    subgraph Board [RZ-EasyFPGA Board]
        
        subgraph FPGA [Cyclone IV EP4CE6E22C8]
            CLK[Clk 50MHz: PIN_23]
            RST[Reset_n: PIN_25]
            
            %% LEDs
            LED1[LED1: PIN_87]
            LED2[LED2: PIN_86]
            LED3[LED3: PIN_85]
            LED4[LED4: PIN_84]
            
            %% Keys
            KEY1[KEY1/Mode: PIN_88]
            KEY2[KEY2: PIN_89]
            KEY3[KEY3: PIN_90]
            KEY4[KEY4: PIN_91]
            
            %% Buzzer
            BUZZ[Buzzer: PIN_110]
            
            %% UART
            UART_TX[UART TX: PIN_11]
            UART_RX[UART RX: PIN_10]
            
            %% VGA
            VGA_H[VGA HSync: PIN_101]
            VGA_V[VGA VSync: PIN_103]
            VGA_R[VGA Red: PIN_106]
            VGA_G[VGA Green: PIN_105]
            VGA_B[VGA Blue: PIN_104]
            
            %% PS/2
            PS2_C[PS2 Clk: PIN_119]
            PS2_D[PS2 Data: PIN_120]
            
            %% I2C
            I2C_SCL[I2C SCL: PIN_112]
            I2C_SDA[I2C SDA: PIN_113]
            
            %% 7-Segment
            SEV_SEL[7-Seg Sel: 133,135,136,137]
            SEV_SEG[7-Seg Seg: 128..124,127]
        end
        
        %% On-Board / External Peripherals
        Osculator((50MHz Osc)) --> CLK
        Button[Push Buttons] --> RST & KEY1 & KEY2 & KEY3 & KEY4
        
        LED1 & LED2 & LED3 & LED4 --> LEDs[4x LEDs]
        BUZZ --> Speaker[Beeper]
        
        VGA_H & VGA_V & VGA_R & VGA_G & VGA_B --> VGA_Con[VGA Connector]
        
        PS2_Dev[Keyboard/Mouse] --> PS2_C & PS2_D
        
        I2C_SCL & I2C_SDA <--> LM75[LM75 Sensor]
        I2C_SCL & I2C_SDA <--> EEPROM[AT24C08]
        
        SEV_SEL & SEV_SEG --> Disp[4-Digit 7-Seg Display]
        
        JTAG_Header[JTAG Header]
        UART_Header[UART Header]
    end
    
    %% Laptop Connections
    Terminal <==>|USB| USB_TTL[USB-TTL Adapter]
    USB_TTL <==>|TX/RX| UART_Header
    UART_Header --- UART_RX & UART_TX
    
    Quartus <==>|USB| Blaster[USB-Blaster]
    Blaster <==>|JTAG| JTAG_Header
    JTAG_Header -.-> FPGA

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