准备QEI和Spi

src/main/scala/backBoard/Qei.scala

@@ -0,0 +1,49 @@
+package BACK
+
+import chisel3._
+import chisel3.util._
+
+
+trait BackBoardSlvQei{ this: BackBoardSlvLocal =>
+  val phaseA = Wire(Bool())
+  val phaseB = Wire(Bool())
+
+
+
+  val counter = Reg(UInt(32.W))
+
+  val encordNxt = Cat( phaseB, phaseA )
+  val encordCur = RegNext(encordNxt)
+
+  val isCheckDirect = Wire(Bool())
+  val is2Multi      = Wire(Bool())
+  val is4Multi      = Wire(Bool())
+
+  val isAdvA =
+    ( encordCur === "b00".U & encordNxt === "b01".U ) |
+    ( encordCur === "b01".U & encordNxt === "b11".U ) |
+    ( encordCur === "b11".U & encordNxt === "b10".U ) |
+    ( encordCur === "b10".U & encordNxt === "b00".U )
+
+  val isAdvB = 
+    ( encordNxt === "b00".U & encordCur === "b01".U ) |
+    ( encordNxt === "b01".U & encordCur === "b11".U ) |
+    ( encordNxt === "b11".U & encordCur === "b10".U ) |
+    ( encordNxt === "b10".U & encordCur === "b00".U )
+
+  val isMiss = encordCur === ~encordNxt
+  val isKeep = encordCur ===  encordNxt
+
+  when(){
+    when( isMiss ){
+      printf("Warning! QEI Miss one pulse!\n")
+    } .elsewhen( isAdvA ){
+
+    } .elsewhen( isAdvB ){
+
+    } .otherwise{
+      assert( isKeep )
+    }
+  }
+
+}