Initial Commit

1 files changed, 63 insertions, 0 deletions

diff --git a/VexRiscv/src/main/scala/vexriscv/demo/CustomCsrDemoPlugin.scala b/VexRiscv/src/main/scala/vexriscv/demo/CustomCsrDemoPlugin.scala
new file mode 100644
index 0000000..a763c83
--- /dev/null
+++ b/VexRiscv/src/main/scala/vexriscv/demo/CustomCsrDemoPlugin.scala
@@ -0,0 +1,63 @@
+package vexriscv.demo
+
+import spinal.core._
+import spinal.lib.io.TriStateArray
+import spinal.lib.{Flow, master}
+import vexriscv.plugin.{CsrInterface, Plugin}
+import vexriscv.{DecoderService, Stageable, VexRiscv}
+
+
+
+class CustomCsrDemoPlugin extends Plugin[VexRiscv]{
+  override def build(pipeline: VexRiscv): Unit = {
+    import pipeline._
+    import pipeline.config._
+
+    pipeline plug new Area{
+      val instructionCounter = Reg(UInt(32 bits))
+      val cycleCounter = Reg(UInt(32 bits))
+
+      cycleCounter := cycleCounter + 1
+      when(writeBack.arbitration.isFiring) {
+        instructionCounter := instructionCounter + 1
+      }
+
+      val csrService = pipeline.service(classOf[CsrInterface])
+      csrService.rw(0xB04, instructionCounter)
+      csrService.r(0xB05, cycleCounter)
+      csrService.onWrite(0xB06){
+        instructionCounter := 0
+      }
+      csrService.onRead(0xB07){
+        instructionCounter := 0x40000000
+      }
+    }
+  }
+}
+
+
+class CustomCsrDemoGpioPlugin extends Plugin[VexRiscv]{
+  var gpio : TriStateArray = null
+
+
+  override def setup(pipeline: VexRiscv): Unit = {
+    gpio = master(TriStateArray(32 bits)).setName("gpio")
+  }
+
+  override def build(pipeline: VexRiscv): Unit = {
+    import pipeline._
+    import pipeline.config._
+
+    pipeline plug new Area{
+      val writeReg, writeEnableReg = Reg(Bits(32 bits))
+
+      val csrService = pipeline.service(classOf[CsrInterface])
+      csrService.rw(0xB08, writeReg)
+      csrService.rw(0xB09, writeEnableReg)
+      csrService.r(0xB0A, gpio.read)
+
+      gpio.writeEnable := writeEnableReg
+      gpio.write := writeReg
+    }
+  }
+}