How you can implement a potentiometer reader using the MCP3008 ADC on a Xilinx FPGA?

here’s how you can implement a potentiometer reader using the MCP3008 ADC on a Xilinx FPGA (e.g., using Vivado and a board like Nexys A7 or Arty):

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Xilinx FPGA Project Overview

External Connections

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Suggested Pin Mapping (Xilinx Example)

text

set_property PACKAGE_PIN V17 [get_ports spi_clk]
set_property PACKAGE_PIN W18 [get_ports spi_mosi]
set_property PACKAGE_PIN W19 [get_ports spi_miso]
set_property PACKAGE_PIN U19 [get_ports spi_cs]
set_property PACKAGE_PIN U16 [get_ports {leds[0]}] # And so on...

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Project Files Structure (Vivado)

bash

/src/
  ├── spi_master.v
  ├── mcp3008_reader.v
  └── top.v
/constraints/
  └── constraints.xdc  (pin assignments)

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Testing Workflow in Vivado

1. Create Vivado Project

   • Target your Xilinx board (e.g., Nexys A7).

   • Add source files and XDC constraints.

2. Simulate (Optional)

   • Test SPI transactions using a testbench.

3. Synthesize, Implement, Generate Bitstream

4. Program FPGA

   • Connect potentiometer.

   • Rotate knob → Observe LEDs changing (representing 10-bit ADC value).

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Optional Enhancements

• Add UART output for debugging (adc_value to serial terminal).

• Add PWM control (e.g., use ADC value to control LED brightness).

• Add 7-segment display module for numeric output.