Chisel实验笔记（三）

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在《Chisel实验笔记（一）》中我们得到了verilog文件，在《Chisel实验笔记（二）》中我们使用Icarus Verilog、GtkWave对的道德verilog文件进行了仿真测试，实际上，时欧诺个Chisel可以得到对应的C++文件，从而可以直接进行仿真，本文就介绍产生C++文件，进行测试的实验过程。

1、修改Max2.scala文件如下：

import Chisel._class Max2 extends Module {  val io = new Bundle {    val in0 = UInt(INPUT,  8)    val in1 = UInt(INPUT,  8)    val out = UInt(OUTPUT, 8)  }  io.out := Mux(io.in0 > io.in1, io.in0, io.in1)  }class Max2Tests(c: Max2) extends Tester(c) {  for (i <- 0 until 10) {    // FILL THIS IN HERE    val in0 = rnd.nextInt(1 << 8)    val in1 = rnd.nextInt(1 << 8)    poke(c.io.in0, in0)    poke(c.io.in1, in1)    // FILL THIS IN HERE    step(1)    expect(c.io.out, if(in0 > in1) in0 else in1)  }}object max2 {  def main(args: Array[String]) : Unit={      val margs=Array("--backend","c","--genHarness","--compile","--test")      chiselMainTest(margs, () => Module(new Max2())){c => new Max2Tests(c)}  }}

相比《Chisel实验笔记（一）》中的Max2.scala代码，其中增加了Max2Tests类，这是专门用来测试的，相当于verilog中的testbench，在这个Max2Test类中，进行了10次循环，每次测试，都随机得到两个8位的数，使用poke将这两个随机数分别赋值给Max2的in0、in1，然后使用expect判断Max2的输出out是否是是in0、in1中较大的那个值。

除了增加Max2Test类，还修改了main中的margs，将其中的“v”改为了“c”，还增加了参数“--genHarness”、“--test”。

然后打开终端，进入chisel_max的目录，输入sbt，再输入run，可以得到如下结果：

> run[info] Compiling 1 Scala source to /home/riscv/Documents/chisel_max/target/scala-2.10/classes...[warn] there were 8 feature warning(s); re-run with -feature for details[warn] one warning found[info] Running max2 CPP elaborate[info] [0.025] // COMPILING < (class Max2)>(0)[info] [0.028] giving names[info] [0.034] executing custom transforms[info] [0.034] adding clocks and resets[info] [0.038] inferring widths[info] [0.042] checking widths[info] [0.043] lowering complex nodes to primitives[info] [0.043] removing type nodes[info] [0.043] compiling 5 nodes[info] [0.044] computing memory ports[info] [0.044] resolving nodes to the components[info] [0.049] creating clock domains[info] [0.050] pruning unconnected IOs[info] [0.051] checking for combinational loops[info] [0.052] NO COMBINATIONAL LOOP FOUND[info] [0.058] populating clock domainsCppBackend::elaborate: need 0, redundant 0 shadow registers[info] [0.067] generating cpp filesCppBackend: createCppFile Max2.cpp[info] [1.729] g++ -c -o ./Max2-emulator.o  -I../ -Inull/csrc/  ./Max2-emulator.cpp RET 0[info] [2.155] g++ -c -o ./Max2.o  -I../ -Inull/csrc/  ./Max2.cpp RET 0[info] [2.302] g++  -o ./Max2 ./Max2.o ./Max2-emulator.o RET 0SEED 1432871199400STARTING ./Max2RESET 5  POKE Max2.io_in0 <-  0x6b  POKE Max2.io_in1 <-  0x99STEP 1 -> 1  PEEK Max2.io_out -> 0x99EXPECT Max2.io_out <- 153 == 153 PASS  POKE Max2.io_in0 <-  0xc  POKE Max2.io_in1 <-  0xa7STEP 1 -> 2  PEEK Max2.io_out -> 0xa7EXPECT Max2.io_out <- 167 == 167 PASS  POKE Max2.io_in0 <-  0x51  POKE Max2.io_in1 <-  0x80STEP 1 -> 3  PEEK Max2.io_out -> 0x80EXPECT Max2.io_out <- 128 == 128 PASS  POKE Max2.io_in0 <-  0xc7  POKE Max2.io_in1 <-  0x8fSTEP 1 -> 4  PEEK Max2.io_out -> 0xc7EXPECT Max2.io_out <- 199 == 199 PASS  POKE Max2.io_in0 <-  0x21  POKE Max2.io_in1 <-  0x60STEP 1 -> 5  PEEK Max2.io_out -> 0x60EXPECT Max2.io_out <- 96 == 96 PASS  POKE Max2.io_in0 <-  0xd6  POKE Max2.io_in1 <-  0xafSTEP 1 -> 6  PEEK Max2.io_out -> 0xd6EXPECT Max2.io_out <- 214 == 214 PASS  POKE Max2.io_in0 <-  0x96  POKE Max2.io_in1 <-  0x98STEP 1 -> 7  PEEK Max2.io_out -> 0x98EXPECT Max2.io_out <- 152 == 152 PASS  POKE Max2.io_in0 <-  0xa4  POKE Max2.io_in1 <-  0x6bSTEP 1 -> 8  PEEK Max2.io_out -> 0xa4EXPECT Max2.io_out <- 164 == 164 PASS  POKE Max2.io_in0 <-  0xe6  POKE Max2.io_in1 <-  0x6cSTEP 1 -> 9  PEEK Max2.io_out -> 0xe6EXPECT Max2.io_out <- 230 == 230 PASS  POKE Max2.io_in0 <-  0x7b  POKE Max2.io_in1 <-  0x3cSTEP 1 -> 10  PEEK Max2.io_out -> 0x7bEXPECT Max2.io_out <- 123 == 123 PASSRAN 10 CYCLES PASSEDPASSED[success] Total time: 3 s, completed May 29, 2015 11:46:41 AM

在终端中输出了10次模拟结果，PASS表示通过测试。

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