package BACK

import chisel3._
import chisel3.util._

class BackPlaneMstTestIO extends Bundle{

  // val SCK  = Input(Bool())
  val interrupt = Output(Bool())
  val clk4            = Input( Bool() )
  val reset = Input(Bool())

  val downStreamRespdat = Output(Bool())

  val req = Flipped(Decoupled(new CDRData))
  val spi = Flipped(Decoupled(new CDR_Master_Interface_Bundle))

}

class BackPlaneMstTest extends RawModule{
  val io: BackPlaneMstTestIO = IO(new BackPlaneMstTestIO)

  withClockAndReset( io.clk4.asClock, io.reset.asAsyncReset ){
    val dut = Module(new BackBoardMst)

    io.downStreamRespdat := dut.io.downStreamRespdat

    // dut.io.CS   := io.CS
    // io.MISO     := dut.io.MISO
    // dut.io.MOSI := io.MOSI
    // dut.io.SCK  := io.SCK

    dut.io.clk4 := io.clk4
    io.interrupt := dut.io.interrupt





    io.spi.ready := true.B
    val cnt = RegInit(0.U(7.W))
    val spiInfo = Reg( new CDR_Master_Interface_Bundle )
    dut.io.MOSI := spiInfo.asUInt().extract( 6+8+32+2+16-1 )
    val cs   = RegInit(true.B);  dut.io.CS   := cs
    val sckCnt = RegInit(1.U(2.W)); dut.io.SCK := sckCnt.extract(1) === 1.U

    when( ~cs ){
      sckCnt := sckCnt + 1.U
    }

    when( io.spi.fire ){
      cs := false.B
      cnt := 0.U
      spiInfo := io.spi.bits
    } .elsewhen( cnt =/= 63.U & sckCnt === "b11".U ){
      cnt := cnt + 1.U
      spiInfo := Cat(spiInfo.asUInt( 6+8+32+2+16-2, 0 ), dut.io.MISO).asTypeOf(new CDR_Master_Interface_Bundle)
    } .elsewhen( cnt === 63.U & sckCnt === "b11".U ){
      cs := true.B
    }



    io.req.ready := true.B
    val reqDat = RegInit(false.B); dut.io.downStreamReqDat := reqDat
    val reqInfo = RegInit(0.U((new CDRData).getWidth.W))
    val datCnt = RegInit( 0.U(2.W) )

    datCnt := datCnt + 1.U

    when( datCnt === "b11".U ) {
      when( io.req.fire  ){
        reqInfo := io.req.bits.asUInt
        reqDat := true.B
      } .otherwise{
        reqDat := reqInfo.extract( 6+8+32+16-1 )
        reqInfo := Cat( reqInfo( 6+8+32+16-2,0 ), 0.U(1.W) )
      }      
    }


  }



}