RASCSI/cpp/scsiloop/scsiloop_timer.cpp

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//---------------------------------------------------------------------------
//
// SCSI Target Emulator PiSCSI for Raspberry Pi
// Loopback tester utility
//
// Copyright (C) 2022 akuker
//
//---------------------------------------------------------------------------
#include "scsiloop_timer.h"
#include "hal/systimer.h"
#include "scsiloop/scsiloop_cout.h"
#include "shared/log.h"
int ScsiLoop_Timer::RunTimerTest(vector<string> &error_list)
{
uint32_t timer_test_failures = 0;
ScsiLoop_Cout::StartTest("hardware timer");
// Allow +/- 2% tolerance when testing the timers
double timer_tolerance_percent = 0.02;
const uint32_t one_second_in_ns = 1000000;
//------------------------------------------------------
// Test SysTimer::GetTimerLow()
LOGDEBUG("++ Testing SysTimer::GetTimerLow()")
uint32_t before = SysTimer::GetTimerLow();
for (int i = 0; i < 10; i++) {
usleep(100000);
ScsiLoop_Cout::PrintUpdate();
}
uint32_t after = SysTimer::GetTimerLow();
uint32_t elapsed_nanosecs = after - before;
LOGDEBUG("Elapsed time: %d %08X", elapsed_nanosecs, elapsed_nanosecs);
if ((elapsed_nanosecs > (one_second_in_ns * (1.0 + timer_tolerance_percent))) ||
(elapsed_nanosecs < (one_second_in_ns * (1.0 - timer_tolerance_percent)))) {
error_list.push_back(fmt::format("SysTimer::GetTimerLow() test: Expected time approx: {}, but actually {}",
one_second_in_ns, elapsed_nanosecs));
timer_test_failures++;
} else {
ScsiLoop_Cout::PrintUpdate();
}
//------------------------------------------------------
// Test SysTimer::SleepUsec()
LOGDEBUG("++ Testing SysTimer::SleepUsec()")
uint32_t expected_usec_result = 1000 * 100;
before = SysTimer::GetTimerLow();
for (int i = 0; i < 100; i++) {
SysTimer::SleepUsec(1000);
}
after = SysTimer::GetTimerLow();
elapsed_nanosecs = after - before;
LOGDEBUG("SysTimer::SleepUsec() Average %d", (uint32_t)(elapsed_nanosecs / 100));
if ((elapsed_nanosecs > expected_usec_result * (1.0 + timer_tolerance_percent)) ||
(elapsed_nanosecs < expected_usec_result * (1.0 - timer_tolerance_percent))) {
error_list.push_back(fmt::format("SysTimer::SleepUsec Test: Expected time approx: {}, but actually {}",
expected_usec_result, elapsed_nanosecs));
timer_test_failures++;
} else {
ScsiLoop_Cout::PrintUpdate();
}
//------------------------------------------------------
// Test SysTimer::SleepNsec()
LOGDEBUG("++ Testing SysTimer::SleepNsec()")
before = SysTimer::GetTimerLow();
SysTimer::SleepNsec(1000000);
after = SysTimer::GetTimerLow();
LOGDEBUG("SysTimer::SleepNSec: %d (expected ~1000)", (uint32_t)(after - before));
elapsed_nanosecs = after - before;
if ((elapsed_nanosecs > (1000 * (1.0 + timer_tolerance_percent))) ||
(elapsed_nanosecs < (1000 * (1.0 - timer_tolerance_percent)))) {
error_list.push_back(
fmt::format("SysTimer::SleepNsec Test: Expected time approx: 1000, but actually {}", elapsed_nanosecs));
timer_test_failures++;
} else {
ScsiLoop_Cout::PrintUpdate();
}
ScsiLoop_Cout::FinishTest("hardware timer", timer_test_failures);
return timer_test_failures;
}