1 | /* |
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2 | * Copyright (c) 2014 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Dornierstr. 4 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <rtems@embedded-brains.de> |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.org/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #ifdef HAVE_CONFIG_H |
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16 | #include "config.h" |
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17 | #endif |
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18 | |
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19 | #include <stdio.h> |
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20 | #include <inttypes.h> |
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21 | |
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22 | #include <rtems.h> |
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23 | #include <rtems/counter.h> |
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24 | |
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25 | #define TESTS_USE_PRINTF |
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26 | #include "tmacros.h" |
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27 | |
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28 | const char rtems_test_name[] = "SPCPUCOUNTER 1"; |
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29 | |
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30 | #define NS_PER_TICK 1000000 |
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31 | |
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32 | static rtems_interval sync_with_clock_tick(void) |
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33 | { |
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34 | rtems_interval start = rtems_clock_get_ticks_since_boot(); |
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35 | rtems_interval current; |
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36 | |
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37 | do { |
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38 | current = rtems_clock_get_ticks_since_boot(); |
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39 | } while (current == start); |
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40 | |
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41 | return current; |
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42 | } |
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43 | |
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44 | static void test_converter(void) |
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45 | { |
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46 | CPU_Counter_ticks frequency = rtems_counter_nanoseconds_to_ticks(1000000000); |
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47 | uint64_t ns = rtems_counter_ticks_to_nanoseconds(frequency); |
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48 | |
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49 | printf("CPU counter frequency: %" PRIu32 "Hz\n", frequency); |
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50 | printf("nanoseconds for frequency count ticks: %" PRIu64 "\n", ns); |
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51 | |
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52 | rtems_test_assert(ns == 1000000000); |
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53 | } |
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54 | |
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55 | static void test_delay_nanoseconds(void) |
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56 | { |
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57 | rtems_counter_ticks start; |
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58 | rtems_counter_ticks end; |
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59 | rtems_counter_ticks delta; |
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60 | double ns_per_tick = NS_PER_TICK; |
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61 | uint64_t ns_delta; |
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62 | rtems_interval tick; |
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63 | int n = 10; |
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64 | int i; |
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65 | |
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66 | printf("test delay nanoseconds (%i times)\n", n); |
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67 | |
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68 | for (i = 0; i < n; ++i) { |
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69 | tick = sync_with_clock_tick(); |
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70 | |
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71 | start = rtems_counter_read(); |
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72 | rtems_counter_delay_nanoseconds(NS_PER_TICK); |
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73 | end = rtems_counter_read(); |
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74 | |
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75 | rtems_test_assert(tick < rtems_clock_get_ticks_since_boot()); |
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76 | |
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77 | delta = rtems_counter_difference(end, start); |
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78 | ns_delta = rtems_counter_ticks_to_nanoseconds(delta); |
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79 | |
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80 | /* Special case for CPU counters using the clock driver counter */ |
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81 | if (ns_delta < rtems_configuration_get_nanoseconds_per_tick()) { |
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82 | printf( |
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83 | "warning: the RTEMS counter seems to be unable to\n" |
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84 | " measure intervals greater than the clock tick interval\n" |
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85 | ); |
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86 | |
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87 | ns_delta += rtems_configuration_get_nanoseconds_per_tick(); |
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88 | } |
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89 | |
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90 | printf( |
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91 | "busy wait duration: %" PRIu64 "ns\n" |
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92 | "busy wait relative to clock tick: %f\n", |
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93 | ns_delta, |
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94 | (ns_delta - ns_per_tick) / ns_per_tick |
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95 | ); |
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96 | } |
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97 | } |
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98 | |
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99 | static void Init(rtems_task_argument arg) |
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100 | { |
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101 | TEST_BEGIN(); |
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102 | |
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103 | test_converter(); |
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104 | test_delay_nanoseconds(); |
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105 | |
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106 | TEST_END(); |
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107 | |
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108 | rtems_test_exit(0); |
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109 | } |
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110 | |
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111 | #define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER |
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112 | #define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER |
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113 | |
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114 | #define CONFIGURE_MICROSECONDS_PER_TICK (NS_PER_TICK / 1000) |
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115 | |
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116 | #define CONFIGURE_MAXIMUM_TASKS 1 |
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117 | |
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118 | #define CONFIGURE_INIT_TASK_ATTRIBUTES RTEMS_FLOATING_POINT |
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119 | |
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120 | #define CONFIGURE_INITIAL_EXTENSIONS RTEMS_TEST_INITIAL_EXTENSION |
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121 | |
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122 | #define CONFIGURE_RTEMS_INIT_TASKS_TABLE |
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123 | |
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124 | #define CONFIGURE_INIT |
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125 | |
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126 | #include <rtems/confdefs.h> |
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