Chisel-STFT

This Chisel project implements a STFT hardware design,and the source and test files are organized as follows.

src/
  main/
    scala/
      FFT/ <Chisel的FFT模块源代码文件>
        Butterfly.scala
        Config.scala
        FFT.scala
		Reorder.scala
		TOP.scala
        VerilogEmitter.scala
	  STFT/ <Chisel的STFT模块源代码文件>
        Hanning.scala//加上汉宁窗
        HanningWithFIFO.scala//输出加上FIFO
        Myfifo.scala
		SpectrogramGen.scala//频谱能量生成模块
		SpectrogramGenWithFIFO.scala//输出加上FIFO
		STFT.scala//主模块
        VerilogEmitter.scala
  test/
    scala/
      STFT/ <Chisel的测试代码文件>
        FFTTest.scala
		HanningTest.scala
		HanningWithFIFOTest.scala
		SpectrogramGenWithFIFOTest.scala
		SpectrogramTest.scala
		STFTTest.scala
		TOPTest.scala

The FPGA folder contains the tcl script and other necessary files for the FPGA flow running on Vivado 2019.2

How to generate Verilog ?

We designed VerilogEmitter.scala to handle all the generations of Verilog code.You can find it in src/main/scala/STFT.

In IntelliJ, you can click the green button near the elaborateSTFT object defined in src/main/scala/STFT/VerilogEmitter.scala to run this object and generate Verilog codes.

The object elaborateSTFT is defined as follows, and some arguments (like the destination directory, etc) could be configured in this process.

object elaborateSTFT extends App {
  (new chisel3.stage.ChiselStage).execute(
    Array("-X", "verilog"),
    Seq(ChiselGeneratorAnnotation(() => new STFT()),
      TargetDirAnnotation("Verilog"))
  )
}

How to run the test ?

The testbench is defined in STFTTest.scala, and you could run the object STFTTest.scala like what we did before to get the simulation results (like the error rate and the overflow rate, etc).

For each module,we also designed a test,like HanningTest is for Hanning,etc,you can run it to test module Hanning simulation results.

How to run the FPGA flow ?

We have already generated a Verilog file STFT.v, for the FPGA project,. You can import the tcl script directly in the Vivado to run the FPGA implementation and evaluation.