Chisel3 - Tutorial - VendingMachineSwitch
import chisel3._
import chisel3.util._ // Problem:
//
// Implement a vending machine using a 'switch' statement.
// 'nickel' is a 5 cent coin
// 'dime' is 10 cent coin
// 'sOk' is reached when there are coins totalling 20 cents or more in the machine.
// The vending machine should return to the 'sIdle' state from the 'sOk' state.
//
class VendingMachineSwitch extends Module {
val io = IO(new Bundle {
val nickel = Input(Bool())
val dime = Input(Bool())
val valid = Output(Bool())
})
val sIdle :: s5 :: s10 :: s15 :: sOk :: Nil = Enum(5)
val state = RegInit(sIdle) switch (state) {
is (sIdle) {
when (io.nickel) { state := s5 }
when (io.dime) { state := s10 }
}
is (s5) {
when (io.nickel) { state := s10 }
when (io.dime) { state := s15 }
}
is (s10) {
when (io.nickel) { state := s15 }
when (io.dime) { state := sOk }
}
is (s15) {
when (io.nickel) { state := sOk }
when (io.dime) { state := sOk }
}
is (sOk) {
state := sIdle
}
}
io.valid := (state === sOk)
} object VendingMachineSwitchMain {
def main(args: Array[String]): Unit = {
chisel3.Driver.execute(Array("--target-dir", "generated/VendingMachineSwitch"), () => new VendingMachineSwitch)
}
}
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