55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
/* test random number generator APIs */
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/*
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* Copyright (c) 2015 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/*
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* This module tests the following random number routines:
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* u32_t sys_rand32_get(void);
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*/
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#include <ztest.h>
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#include <logging/sys_log.h>
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#define N_VALUES 10
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/**
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*
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* @brief Regression test's entry point
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*
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*
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* @return N/A
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*/
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void rand32_test(void)
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{
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u32_t rnd_values[N_VALUES];
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int i;
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/*
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* Test subsequently calls sys_rand32_get(), checking
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* that two values are not equal.
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*/
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SYS_LOG_DBG("Generating random numbers");
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/*
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* Get several subsequent numbers as fast as possible.
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* If random number generator is based on timer, check
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* the situation when random number generator is called
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* faster than timer clock ticks.
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* In order to do this, make several subsequent calls
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* and save results in an array to verify them on the
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* next step
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*/
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for (i = 0; i < N_VALUES; i++) {
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rnd_values[i] = sys_rand32_get();
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}
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for (i = 1; i < N_VALUES; i++) {
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zassert_false((rnd_values[i - 1] == rnd_values[i]),
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"random number subsequent calls return same value");
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}
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}
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