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# $Id: perf.tcl 516 2013-05-05 21:24:52Z mueller $

#

# Copyright 2011- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>

#

# This program is free software; you may redistribute and/or modify it under

# the terms of the GNU General Public License as published by the Free

# Software Foundation, either version 2, or at your option any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY

# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

# for complete details.

#

#  Revision History:

# Date         Rev Version  Comment

# 2011-04-17   376   1.0    Initial version

#

package provide tst_rlink 1.0

namespace eval tst_rlink {

  #

  # perf_wtlam: determine wtlam latency using timer.0

  # 

  proc perf_wtlam {{tmax 1000}} {

    if {$tmax < 1} { error "-E: perf_wtlam: tmax argument must be >= 1" }

    set rval "delay  latency"

    rlc exec -init 0xff [regbld rlink::INIT anena]

    for {set dly 250} {$dly <= 10000} {incr dly 250} {

      rlc exec \

        -wreg timer.0 0 \

        -wreg timer.1 0

      rlc exec -attn

      set tbeg [clock clicks -milliseconds]

      rlc exec -wreg timer.0 $dly

      for {set i 1} {1} {incr i} {

        rlc wtlam 1.

        rlc exec \

          -attn \

          -wreg timer.0 $dly

        set trun [expr {[clock clicks -milliseconds] - $tbeg}]

        if {$trun > $tmax} { break }

      }

      set ms [expr {double($trun) / double($i)}]

      append rval [format "\n%5d   %6.2f" $dly $ms]

    }

    rlc exec -init 0xff [regbld rlink::INIT {anena 0}]

    return $rval

  }

}