2. Switch & LED

Select the Board

Ensure your target board is set to Soan Papdi in the bottom-right corner.

If you haven’t set this up yet, see the detailed steps in Example 1: Getting Started.

Open the “Pushbutton & LED” Example

Open the Pushbutton & LED example from the Icestudio examples menu:

When you open this example, Icestudio will prompt you to convert the pin mappings for Soan Papdi:

• Click on Convert to continue.

Understand the Blocks

How the Circuit Works?

• PUSHBUTTON (Input Block): Reads the switch position. Even though the block is named Pushbutton, it maps to the DIP slide switch on the Soan Papdi.

  1. Slide ON ➜ sends high (1)
  2. Slide OFF ➜ sends low (0)

• Wire: Passes the signal straight from the switch to the LED.

• LED (Output): Turns ON when it receives 1 and turns OFF when it receives 0.

Choose the LED pin:

We need to assign physical FPGA pins to both the input and output blocks.

• LED Pin: Click the dropdown on the LED block and select D0.
• Switch Pin: Click the dropdown on the PUSHBUTTON block and select the A0 pin.

Build Your Project

Click the Build button in the bottom-right corner to convert your visual blocks into an FPGA bitstream.

Upload Your Project

Your bitstream is ready. Now, let’s upload it to the Soan Papdi.

Step A: Enter Programming Mode

Put your board into programming mode before flashing. If you haven’t done this before, follow the steps in Example 1: Getting Started.

If your project ever fails to upload, always check if you remembered to put the board in programming mode first!

Now, let’s send our project to the board.

Step B: Upload the Bitstream

1. Click the Upload icon in the bottom-right corner of iCEstudio.

2. Once the upload is complete, press the RESET button on the board to start running your new design.