Nicolas Borla / Mbed OS BBR_1Ebene

BBR 1 Ebene

mbed-os/TESTS/events/timing/main.cpp@0:fbdae7e6d805, 2018-05-14 (annotated)

Committer:
borlanic
Date:
Mon May 14 11:29:06 2018 +0000
Revision:
0:fbdae7e6d805
BBR

Who changed what in which revision?

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borlanic 0:fbdae7e6d805 1 /* mbed Microcontroller Library
borlanic 0:fbdae7e6d805 2 * Copyright (c) 2017 ARM Limited
borlanic 0:fbdae7e6d805 3 *
borlanic 0:fbdae7e6d805 4 * Licensed under the Apache License, Version 2.0 (the "License");
borlanic 0:fbdae7e6d805 5 * you may not use this file except in compliance with the License.
borlanic 0:fbdae7e6d805 6 * You may obtain a copy of the License at
borlanic 0:fbdae7e6d805 7 *
borlanic 0:fbdae7e6d805 8 * http://www.apache.org/licenses/LICENSE-2.0
borlanic 0:fbdae7e6d805 9 *
borlanic 0:fbdae7e6d805 10 * Unless required by applicable law or agreed to in writing, software
borlanic 0:fbdae7e6d805 11 * distributed under the License is distributed on an "AS IS" BASIS,
borlanic 0:fbdae7e6d805 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
borlanic 0:fbdae7e6d805 13 * See the License for the specific language governing permissions and
borlanic 0:fbdae7e6d805 14 * limitations under the License.
borlanic 0:fbdae7e6d805 15 */
borlanic 0:fbdae7e6d805 16 #include "mbed_events.h"
borlanic 0:fbdae7e6d805 17 #include "mbed.h"
borlanic 0:fbdae7e6d805 18 #include "rtos.h"
borlanic 0:fbdae7e6d805 19 #include "greentea-client/test_env.h"
borlanic 0:fbdae7e6d805 20 #include "unity.h"
borlanic 0:fbdae7e6d805 21 #include "utest.h"
borlanic 0:fbdae7e6d805 22 #include <cstdlib>
borlanic 0:fbdae7e6d805 23 #include <cmath>
borlanic 0:fbdae7e6d805 24
borlanic 0:fbdae7e6d805 25 using namespace utest::v1;
borlanic 0:fbdae7e6d805 26
borlanic 0:fbdae7e6d805 27
borlanic 0:fbdae7e6d805 28 // Test delay
borlanic 0:fbdae7e6d805 29 #ifndef TEST_EVENTS_TIMING_TIME
borlanic 0:fbdae7e6d805 30 #define TEST_EVENTS_TIMING_TIME 20000
borlanic 0:fbdae7e6d805 31 #endif
borlanic 0:fbdae7e6d805 32
borlanic 0:fbdae7e6d805 33 #ifndef TEST_EVENTS_TIMING_MEAN
borlanic 0:fbdae7e6d805 34 #define TEST_EVENTS_TIMING_MEAN 25
borlanic 0:fbdae7e6d805 35 #endif
borlanic 0:fbdae7e6d805 36
borlanic 0:fbdae7e6d805 37 #ifndef M_PI
borlanic 0:fbdae7e6d805 38 #define M_PI 3.14159265358979323846264338327950288
borlanic 0:fbdae7e6d805 39 #endif
borlanic 0:fbdae7e6d805 40
borlanic 0:fbdae7e6d805 41 // Random number generation to skew timing values
borlanic 0:fbdae7e6d805 42 float gauss(float mu, float sigma) {
borlanic 0:fbdae7e6d805 43 float x = (float)rand() / ((float)RAND_MAX+1);
borlanic 0:fbdae7e6d805 44 float y = (float)rand() / ((float)RAND_MAX+1);
borlanic 0:fbdae7e6d805 45 float x2pi = x*2.0*M_PI;
borlanic 0:fbdae7e6d805 46 float g2rad = sqrt(-2.0 * log(1.0-y));
borlanic 0:fbdae7e6d805 47 float z = cos(x2pi) * g2rad;
borlanic 0:fbdae7e6d805 48 return mu + z*sigma;
borlanic 0:fbdae7e6d805 49 }
borlanic 0:fbdae7e6d805 50
borlanic 0:fbdae7e6d805 51 float chisq(float sigma) {
borlanic 0:fbdae7e6d805 52 return pow(gauss(0, sqrt(sigma)), 2);
borlanic 0:fbdae7e6d805 53 }
borlanic 0:fbdae7e6d805 54
borlanic 0:fbdae7e6d805 55
borlanic 0:fbdae7e6d805 56 Timer timer;
borlanic 0:fbdae7e6d805 57 DigitalOut led(LED1);
borlanic 0:fbdae7e6d805 58
borlanic 0:fbdae7e6d805 59 equeue_sema_t sema;
borlanic 0:fbdae7e6d805 60
borlanic 0:fbdae7e6d805 61 // Timer timing test
borlanic 0:fbdae7e6d805 62 void timer_timing_test() {
borlanic 0:fbdae7e6d805 63 timer.reset();
borlanic 0:fbdae7e6d805 64 timer.start();
borlanic 0:fbdae7e6d805 65 int prev = timer.read_us();
borlanic 0:fbdae7e6d805 66
borlanic 0:fbdae7e6d805 67 while (prev < TEST_EVENTS_TIMING_TIME*1000) {
borlanic 0:fbdae7e6d805 68 int next = timer.read_us();
borlanic 0:fbdae7e6d805 69 if (next < prev) {
borlanic 0:fbdae7e6d805 70 printf("backwards drift %d -> %d (%08x -> %08x)\r\n",
borlanic 0:fbdae7e6d805 71 prev, next, prev, next);
borlanic 0:fbdae7e6d805 72 }
borlanic 0:fbdae7e6d805 73 TEST_ASSERT(next >= prev);
borlanic 0:fbdae7e6d805 74 prev = next;
borlanic 0:fbdae7e6d805 75 }
borlanic 0:fbdae7e6d805 76 }
borlanic 0:fbdae7e6d805 77
borlanic 0:fbdae7e6d805 78 // equeue tick timing test
borlanic 0:fbdae7e6d805 79 void tick_timing_test() {
borlanic 0:fbdae7e6d805 80 unsigned start = equeue_tick();
borlanic 0:fbdae7e6d805 81 int prev = 0;
borlanic 0:fbdae7e6d805 82
borlanic 0:fbdae7e6d805 83 while (prev < TEST_EVENTS_TIMING_TIME) {
borlanic 0:fbdae7e6d805 84 int next = equeue_tick() - start;
borlanic 0:fbdae7e6d805 85 if (next < prev) {
borlanic 0:fbdae7e6d805 86 printf("backwards drift %d -> %d (%08x -> %08x)\r\n",
borlanic 0:fbdae7e6d805 87 prev, next, prev, next);
borlanic 0:fbdae7e6d805 88 }
borlanic 0:fbdae7e6d805 89 TEST_ASSERT(next >= prev);
borlanic 0:fbdae7e6d805 90 prev = next;
borlanic 0:fbdae7e6d805 91 }
borlanic 0:fbdae7e6d805 92 }
borlanic 0:fbdae7e6d805 93
borlanic 0:fbdae7e6d805 94 // equeue semaphore timing test
borlanic 0:fbdae7e6d805 95 void semaphore_timing_test() {
borlanic 0:fbdae7e6d805 96 srand(0);
borlanic 0:fbdae7e6d805 97 timer.reset();
borlanic 0:fbdae7e6d805 98 timer.start();
borlanic 0:fbdae7e6d805 99
borlanic 0:fbdae7e6d805 100 int err = equeue_sema_create(&sema);
borlanic 0:fbdae7e6d805 101 TEST_ASSERT_EQUAL(0, err);
borlanic 0:fbdae7e6d805 102
borlanic 0:fbdae7e6d805 103 while (timer.read_ms() < TEST_EVENTS_TIMING_TIME) {
borlanic 0:fbdae7e6d805 104 int delay = chisq(TEST_EVENTS_TIMING_MEAN);
borlanic 0:fbdae7e6d805 105
borlanic 0:fbdae7e6d805 106 int start = timer.read_us();
borlanic 0:fbdae7e6d805 107 equeue_sema_wait(&sema, delay);
borlanic 0:fbdae7e6d805 108 int taken = timer.read_us() - start;
borlanic 0:fbdae7e6d805 109
borlanic 0:fbdae7e6d805 110 if (taken < (delay * 1000 - 5000) || taken > (delay * 1000 + 5000)) {
borlanic 0:fbdae7e6d805 111 printf("delay %dms => error %dus\r\n", delay, abs(1000 * delay - taken));
borlanic 0:fbdae7e6d805 112 }
borlanic 0:fbdae7e6d805 113
borlanic 0:fbdae7e6d805 114 TEST_ASSERT_INT_WITHIN(5000, taken, delay * 1000);
borlanic 0:fbdae7e6d805 115
borlanic 0:fbdae7e6d805 116 led = !led;
borlanic 0:fbdae7e6d805 117 }
borlanic 0:fbdae7e6d805 118
borlanic 0:fbdae7e6d805 119 equeue_sema_destroy(&sema);
borlanic 0:fbdae7e6d805 120 }
borlanic 0:fbdae7e6d805 121
borlanic 0:fbdae7e6d805 122
borlanic 0:fbdae7e6d805 123 // Test setup
borlanic 0:fbdae7e6d805 124 utest::v1::status_t test_setup(const size_t number_of_cases) {
borlanic 0:fbdae7e6d805 125 GREENTEA_SETUP((number_of_cases+1)*TEST_EVENTS_TIMING_TIME/1000, "default_auto");
borlanic 0:fbdae7e6d805 126 return verbose_test_setup_handler(number_of_cases);
borlanic 0:fbdae7e6d805 127 }
borlanic 0:fbdae7e6d805 128
borlanic 0:fbdae7e6d805 129 const Case cases[] = {
borlanic 0:fbdae7e6d805 130 Case("Testing accuracy of timer", timer_timing_test),
borlanic 0:fbdae7e6d805 131 Case("Testing accuracy of equeue tick", tick_timing_test),
borlanic 0:fbdae7e6d805 132 Case("Testing accuracy of equeue semaphore", semaphore_timing_test),
borlanic 0:fbdae7e6d805 133 };
borlanic 0:fbdae7e6d805 134
borlanic 0:fbdae7e6d805 135 Specification specification(test_setup, cases);
borlanic 0:fbdae7e6d805 136
borlanic 0:fbdae7e6d805 137 int main() {
borlanic 0:fbdae7e6d805 138 return !Harness::run(specification);
borlanic 0:fbdae7e6d805 139 }
borlanic 0:fbdae7e6d805 140