/*
 * Copyright (C) 2019 Kaspar Schleiser <kaspar@schleiser.de>
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */

/**
 * @ingroup     tests
 * @{
 *
 * @file
 * @brief       Peripheral timer test application
 *
 * @author      Kaspar Schleiser <kaspar@schleiser.de>
 *
 * @}
 */

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>

#include "board.h"
#include "macros/units.h"
#include "thread.h"
#include "thread_flags.h"

#include "periph/timer.h"

/* recreate logic to obtain valid XTIMER_DEV used in xtimer.h, but don't include
 * xtimer.h, as this leads to issues on some boards when the xtimer module is
 * not used */
#ifndef XTIMER_DEV
# define XTIMER_DEV         TIMER_DEV(0)
#endif
#ifndef XTIMER_HZ
# define XTIMER_HZ          MHZ(1)
#endif
#ifndef XTIMER_WIDTH
# if(TIMER_0_MAX_VALUE) == 0xfffffful
#  define XTIMER_WIDTH      (24)
# elif (TIMER_0_MAX_VALUE) == 0xffff
#  define XTIMER_WIDTH      (16)
# else
#  define XTIMER_WIDTH      (32)
# endif
#endif /* !defined(XTIMER_WIDTH) */

#ifndef TEST_TIMER_FREQ
# define TEST_TIMER_DEV     XTIMER_DEV
# define TEST_TIMER_FREQ    XTIMER_HZ
# define TEST_TIMER_WIDTH   XTIMER_WIDTH
#endif

#ifndef TEST_MAX_DIFF
#define TEST_MAX_DIFF   (1000LU)
#endif

#if TEST_TIMER_WIDTH == 32
# define TEST_TIMER_MAX      (0xFFFFFFFFLU)
#else
# define TEST_TIMER_MAX      ((1UL << TEST_TIMER_WIDTH) - 1)
#endif

static void cb(void *arg, int chan)
{
    (void)chan;
    thread_flags_set(arg, 1);
}

int main(void)
{
    puts("\nTest for peripheral TIMER short timer_set()\n");

    printf("This test tries timer_set() with decreasing intervals down to 0.\n"
           "You should see lines like 'interval <n>: OK', followed by a success"
           " message.\n"
           "On failure, this test prints an error message.\n\n");

    printf("testing periph_timer %u, freq %lu, bits = %u\n",
           TEST_TIMER_DEV, TEST_TIMER_FREQ, TEST_TIMER_WIDTH);
    timer_init(TEST_TIMER_DEV, TEST_TIMER_FREQ, cb, thread_get_active());

    uint32_t interval = 16;
    const unsigned max_repetitions = 128;
    while (interval--) {
        for (unsigned rep = 0; rep < max_repetitions; rep++) {
            uint32_t before = timer_read(TEST_TIMER_DEV);
            timer_set(TEST_TIMER_DEV, 0, interval);
            while (!thread_flags_clear(1)) {
                uint32_t diff = (timer_read(TEST_TIMER_DEV) - before)
                                & TEST_TIMER_MAX;
                if (diff > TEST_MAX_DIFF) {
                    printf("ERROR: too long delay, aborted after %" PRIu32
                            " (TEST_MAX_DIFF=%lu) on repetition %u\n"
                            "TEST FAILED\n",
                            diff, TEST_MAX_DIFF, rep);
                    return EXIT_FAILURE;
                }
            }
        }
        printf("interval %" PRIu32 ": OK\n", interval);
    }

    puts("\nTEST SUCCEEDED");

    return EXIT_SUCCESS;
}