src/main/scala/devices/spi/SPIPins.scala

   1 // See LICENSE for license details.
   2 package sifive.blocks.devices.spi
   3
   4 import Chisel._
   5 import chisel3.experimental.{withClockAndReset}
   6 import sifive.blocks.devices.pinctrl.{PinCtrl, Pin}
   7
   8 class SPIPins[T <: Pin] (pingen: ()=> T, c: SPIParamsBase) extends SPIBundle(c) {
   9
  10   val sck = pingen()
  11   val dq  = Vec(4, pingen())
  12   val cs  = Vec(c.csWidth, pingen())
  13
  14   override def cloneType: this.type =
  15     this.getClass.getConstructors.head.newInstance(pingen, c).asInstanceOf[this.type]
  16
  17   def fromPort(spi: SPIPortIO, clock: Clock, reset: Bool,
  18     syncStages: Int = 0, driveStrength: Bool = Bool(false)) {
  19
  20     withClockAndReset(clock, reset) {
  21       sck.outputPin(spi.sck, ds = driveStrength)
  22
  23       (dq zip spi.dq).foreach {case (p, s) =>
  24         p.outputPin(s.o, pue = Bool(true), ds = driveStrength)
  25         p.o.oe := s.oe
  26         p.o.ie := ~s.oe
  27         s.i := ShiftRegister(p.i.ival, syncStages)
  28       }
  29
  30       (cs zip spi.cs) foreach { case (c, s) =>
  31         c.outputPin(s, ds = driveStrength)
  32       }
  33     }
  34   }
  35 }