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Use NonBlockingEnqueue for terminal writes 

This provides feedback to the programm if the last value was already
printed to the terminal. If not, new values are ignored (unchanged).
This commit is contained in:
Klemens Schölhorn 2018-05-14 20:05:14 +02:00
parent 48d8524c4a
commit 88f1cbe420
1 changed files with 2 additions and 12 deletions
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14
src/main/scala/devices/terminal/Terminal.scala
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@ -10,7 +10,7 @@ import freechips.rocketchip.regmapper._
import freechips.rocketchip.subsystem.{BaseSubsystem} import freechips.rocketchip.subsystem.{BaseSubsystem}
import freechips.rocketchip.tilelink._ import freechips.rocketchip.tilelink._
import freechips.rocketchip.util.AsyncQueue import freechips.rocketchip.util.AsyncQueue
import sifive.blocks.util.NonBlockingEnqueue
case class TerminalParams ( case class TerminalParams (
address: BigInt address: BigInt
@ -69,18 +69,8 @@ trait TerminalRegModule extends MultiIOModule with HasRegMap {
term.io.write_data := crossing.io.deq.bits term.io.write_data := crossing.io.deq.bits
crossing.io.deq.ready := Bool(true) // terminal can read at every cycle crossing.io.deq.ready := Bool(true) // terminal can read at every cycle
val writer_fn = (valid: Bool, data: UInt) => {
crossing.io.enq.valid := valid
crossing.io.enq.bits := data
Bool(true) // discards values if queue is full (see NonBlockingEnqueue)
}
regmap( regmap(
0 -> Seq ( 0 -> NonBlockingEnqueue(crossing.io.enq)
RegField.w(8, writer_fn, RegFieldDesc(
"write", "Write an ASCII character to the terminal."
))
)
) )
} }