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//==========================================================================

//

//        clockcnv.cxx

//

//        Clock Converter test

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

// Copyright (C) 2003 Gary Thomas

//

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//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     hmt

// Contributors:  hmt

// Date:          2000-01-24

// Description:   Tests the Kernel Real Time Clock Converter subsystem

// 

//####DESCRIPTIONEND####

#include <pkgconf/kernel.h>

#include <cyg/kernel/clock.hxx>

#include <cyg/kernel/thread.hxx>

#include <cyg/infra/testcase.h>

#include <cyg/kernel/clock.inl>

#include <cyg/kernel/thread.inl>

#ifdef CYGVAR_KERNEL_COUNTERS_CLOCK

#include <cyg/infra/diag.h>

static void null_printf(const char *, ...)

{ /* nothing */ }

#define PRINTF0 diag_printf

#define nPRINTF0 null_printf

#define nPRINTF1 diag_printf

#define PRINTF1 null_printf

#define nPRINTF2 diag_printf

#define PRINTF2 null_printf

#define NTHREADS 1

#include "testaux.hxx"

static struct { cyg_uint32 ns; double scale; } ns_tickers[] = {

    { 70000000, 7.0 },                  // 7cS

    { 50000000, 5.0 },                  // 5cS

    { 45000000, 4.5 },                  // 4.5cS

    { 30000000, 3.0 },                  // 3cS

    { 20000000, 2.0 },                  // 2cS

    { 10000000, 1.0 },                  // 1cS - no change

    {  5000000, 0.5 },                  // 1/2 a cS

    {  4900000, 0.49 },                 // a bit below

    {  3333333, 0.3333333 },            // 1/3 cS

    {  1250000, 0.125 },                // 800Hz

    {  1000000, 0.1 },                  // 1000Hz

    {   909090, 0.0909090 },            // 1100Hz

    {   490000, 0.049 },                // 490uS

    {   333333, 0.0333333 },            // 1/30 cS, 1/3mS

    {    49000, 0.0049 },               // 49uS

    {    33333, 0.0033333 },            // 1/30 mS

    {     4900, 0.00049 },              // 4.9uS

    // now some outlandish ones

    {      170, 0.000017 },             // 170nS

    {       11, 0.0000011 },            // 11nS

    { 1000000000u, 100.0 },             // one second

    { 1234567777u, 123.4567777 },       // 1.234... seconds

    { 4294967291u, 429.4967291 },       // 4.3 seconds, nearly maxint.

    // now some which are prime in the nS per tick field

    {   909091, 0.0909091 },            // also 1100Hz - but 909091 is a prime!

    // and some eye-pleasing primes from the www - if they're not actually

    // prime, don't blame me.   http://www.rsok.com/~jrm/printprimes.html

    {  1000003, 0.1000003 },

    {  1477771, 0.1477771 },

    {  2000003, 0.2000003 },

    {  2382001, 0.2382001 },

    {  3333133, 0.3333133 },

    {  3999971, 0.3999971 },

    {  5555591, 0.5555591 },

    {  6013919, 0.6013919 },

    // That's enough

};

static void entry0( CYG_ADDRWORD data )

{

    // First just try it with the clock as default:

    Cyg_Clock *rtc = Cyg_Clock::real_time_clock;

    Cyg_Clock::converter cv, rcv;

    Cyg_Clock::cyg_resolution res;

    unsigned int counter = 0;

    unsigned int skipped = 0;

    unsigned int i;

    for ( i = 0; i < sizeof( ns_tickers )/sizeof( ns_tickers[0] ); i++ ) {

        unsigned int lcounter = 0;

        unsigned int lskipped = 0;

        rtc->get_other_to_clock_converter( ns_tickers[i].ns, &cv );

        rtc->get_clock_to_other_converter( ns_tickers[i].ns, &rcv );

        PRINTF1( "ns per tick: %d\n", ns_tickers[i].ns );

        PRINTF1( "  converter: * %d / %d * %d / %d\n",

                     (int)cv.mul1, (int)cv.div1, (int)cv.mul2,(int) cv.div2 );

        PRINTF1( "   reverser: * %d / %d * %d / %d\n",

                     (int)rcv.mul1, (int)rcv.div1, (int)rcv.mul2, (int)rcv.div2 );

        double d = 1.0;

        d *= (double)cv.mul1;

        d /= (double)cv.div1;

        d *= (double)cv.mul2;

        d /= (double)cv.div2;

        d *= (double)rcv.mul1;

        d /= (double)rcv.div1;

        d *= (double)rcv.mul2;

        d /= (double)rcv.div2;

        PRINTF1( "       composite product %d.%d\n",

                     (int)d, ((int)(d * 1000000) % 1000000 ) );

        d -= 1.0;

        CYG_TEST_CHECK( d < +0.0001, "Overflow in composite product" );

        CYG_TEST_CHECK( d > -0.0001, "Underflow in composite product" );

        res = rtc->get_resolution();

        double factor_other_to_clock;

        double factor_clock_to_other;

        // res.dividend/res.divisor is the number of nS in a system

        // clock tick.  So:

        d = (double)res.dividend/(double)res.divisor;

        factor_other_to_clock = ns_tickers[i].scale * 1.0e7 / d ;

        factor_clock_to_other = d / (ns_tickers[i].scale * 1.0e7);

        unsigned int j;

        for ( j = 1; j < 100; j++ ) {

            cyg_uint64 delay;

            if (cyg_test_is_simulator)

                j += 30;                // test fewer values

                                   /* tr.b..m..k.. */

#ifdef CYGPKG_HAL_V85X_V850_CEB

            j += 30;                    // test fewer values

#endif

            for ( delay = j; delay < 1000000000000ll; delay *= 10 ) {

                // get the converted result

                cyg_uint64 result = Cyg_Clock::convert( delay, &cv );

                counter++; lcounter++;

                if ( (double)delay * (double)cv.mul1 > 1.6e+19 ||

                     (double)delay * (double)rcv.mul1 > 1.6e+19 ) {

                    // in silly territory now, give up.

                    // (that's MAXINT squared, approx.)

                    skipped++; lskipped++;

                    continue; // so the counter is accurate

                }

                PRINTF2( "delay %x%08x to result %x%08x\n",

                             (int)(delay >> 32), (int)delay,

                             (int)(result >> 32), (int)result );

                // get what it should be in double maths

                double delta = factor_other_to_clock * (double)delay;

                if ( delta > 1000.0 ) {

                    delta = (double)result - delta;

                    delta /= (double)result;

                    CYG_TEST_CHECK( delta <= +0.01,

                          "Proportional overflow in conversion to" );

                    CYG_TEST_CHECK( delta >= -0.01,

                          "Proportional underflow in conversion to" );

                }

                else {

                    cyg_uint64 lo = (cyg_uint64)(delta); // assume TRUNCATION

                    cyg_uint64 hi = lo + 1;

                    CYG_TEST_CHECK( hi >= result,

                                    "Range overflow in conversion to" );

                    CYG_TEST_CHECK( lo <= result,

                                    "Range underflow in conversion to" );

                }

                // get the converted result

                result = Cyg_Clock::convert( delay, &rcv );

                PRINTF2( "delay %x%08x from result %x%08x\n",

                             (int)(delay >> 32), (int)delay,

                             (int)(result >> 32), (int)result );

                // get what it should be in double maths

                delta = factor_clock_to_other * (double)delay;

                if ( delta > 1000.0 ) {

                    delta = (double)result - delta;

                    delta /= (double)result;

                    CYG_TEST_CHECK( delta <= +0.01,

                          "Proportional overflow in conversion from" );

                    CYG_TEST_CHECK( delta >= -0.01,

                          "Proportional underflow in conversion from" );

                }

                else {

                    cyg_uint64 lo = (cyg_uint64)(delta); // assume TRUNCATION

                    cyg_uint64 hi = lo + 1;

                    CYG_TEST_CHECK( hi >= result,

                                    "Range overflow in conversion from" );

                    CYG_TEST_CHECK( lo <= result,

                                    "Range underflow in conversion from" );

                }

                if (cyg_test_is_simulator)

                    break;

            }

        }

        PRINTF0( "INFO:<%d nS/tick: tested %d values, skipped %d because of overflow>\n",

                 ns_tickers[i].ns, lcounter, lskipped );

    }

    PRINTF0( "INFO:<tested %d values, total skipped %d because of overflow>\n",

             counter, skipped );

    CYG_TEST_PASS_FINISH("ClockCnv OK");

}

void clockcnv_main( void )

{

    CYG_TEST_INIT();

    new_thread(entry0, (CYG_ADDRWORD)&thread_obj[0]);

    Cyg_Scheduler::start();

}

externC void

cyg_start( void )

{

#ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG

    cyg_hal_invoke_constructors();

#endif

    clockcnv_main();

}

#else // def CYGVAR_KERNEL_COUNTERS_CLOCK

externC void

cyg_start( void )

{

    CYG_TEST_INIT();

    CYG_TEST_NA( "Kernel real-time clock disabled");

}

#endif // def CYGVAR_KERNEL_COUNTERS_CLOCK

// EOF clockcnv.cxx