riscv/sifive-blocks
1
0
Fork 0
Code Releases Activity

Use NonBlockingEnqueue for terminal writes

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/main/scala/devices/terminal/Terminal.scala
View File

@ -10,7 +10,7 @@ import freechips.rocketchip.regmapper._
import freechips.rocketchip.subsystem.{BaseSubsystem}
import freechips.rocketchip.tilelink._
import freechips.rocketchip.util.AsyncQueue
import sifive.blocks.util.NonBlockingEnqueue
case class TerminalParams (
address: BigInt
@ -69,18 +69,8 @@ trait TerminalRegModule extends MultiIOModule with HasRegMap {
term.io.write_data := crossing.io.deq.bits
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(
0 -> Seq (
RegField.w(8, writer_fn, RegFieldDesc(
"write", "Write an ASCII character to the terminal."
))
)
0 -> NonBlockingEnqueue(crossing.io.enq)
)
}