Light Up Your First FPGA Project: A Blinking LED When you see the small light on the circuit board start to blink regularly, it means your FPGA program is truly “alive”! Below, we will guide you step by step to achieve this ceremonial introductory experiment.
1. 🔌 Hardware Preparation Connect the Development Board Insert the USB interface of the Zedboard Artix-7 development board into the computer’s USB port (no additional power supply is needed). Ensure that the eight red LED indicators labeled LD0~LD7 on the board are visible. Key Jumper Settings Locate the small dip switch next to the onboard JTAG interface and set all switches to the ON position (for debugging communication). Confirm that the power indicator light PWR is lit, indicating normal power supply.
2. đź’» Software Operation Full Process
Step 1: Create a New Project Open Vivado and click on Create Project, naming the project “blinky” (meaning a blinking light). When selecting the device type, be sure to accurately match your development board model— for example, select the xc7a35ticsg324-1L chip.
Step 2: Draw the Circuit Blueprint Although we won’t be writing code by hand, we still need to understand the core principles: Clock Source Taming: The development board has a stable crystal oscillator providing a heartbeat pulse (usually 100MHz), and we need to reduce it to a frequency suitable for human observation (about 1Hz). Counter Magic: Use a 26-bit binary counter to accumulate clock pulses, and when a certain value is reached, the LED state flips. It’s as simple as a stopwatch!
Step 3: Bind Physical Channels Specify the GPIO pin number corresponding to LD0 in the constraint file (specific parameters should be referenced in the development board manual). This step is equivalent to telling the compiler: “Please send this virtual signal to the real physical pad.”
3. ⚡️ Witness the Miracle Moment After completing the above configurations, click “Generate Bitstream” and wait about half a minute for the compilation to finish. Then, in the popped-up hardware manager, scan for your device, load the generated .bit file, and click “Program”. At this moment, you will see:
âś… Success Indicator: The previously constantly lit LED starts to blink evenly at a frequency of 1Hz.
❌ Troubleshooting: If you do not see blinking, check if you forgot to enable the global clock buffer (BUFG component).