ref: fc5424cb72e477c5f1bbfaeddb5c50b851a965ae
src/libs/mynewt-nimble/porting/nimble/include/os/os_cputime.h
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 |
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ /** * @addtogroup OSKernel * @{ * @defgroup OSCPUTime High Resolution Timers * @{ */ #ifndef H_OS_CPUTIME_ #define H_OS_CPUTIME_ #ifdef __cplusplus extern "C" { #endif #include "syscfg/syscfg.h" #include "hal/hal_timer.h" #include "os/os.h" /* * NOTE: these definitions allow one to override the cputime frequency used. * The reason these definitions exist is to make the code more * efficient/smaller when CPUTIME counts at 1 MHz. * * For those who want a different cputime frequency, you can set the config * definition for OS_CPUTIME_FREQ to the desired frequency in your project, * target or bsp. */ #if (MYNEWT_VAL(OS_CPUTIME_FREQ) == 1000000) #define OS_CPUTIME_FREQ_1MHZ #elif MYNEWT_VAL(OS_CPUTIME_FREQ) == 256 || \ MYNEWT_VAL(OS_CPUTIME_FREQ) == 512 || \ MYNEWT_VAL(OS_CPUTIME_FREQ) == 1024 || \ MYNEWT_VAL(OS_CPUTIME_FREQ) == 2048 || \ MYNEWT_VAL(OS_CPUTIME_FREQ) == 4096 || \ MYNEWT_VAL(OS_CPUTIME_FREQ) == 8192 || \ MYNEWT_VAL(OS_CPUTIME_FREQ) == 16384 || \ MYNEWT_VAL(OS_CPUTIME_FREQ) == 32768 || \ MYNEWT_VAL(OS_CPUTIME_FREQ) == 65536 || \ MYNEWT_VAL(OS_CPUTIME_FREQ) == 131072 || \ MYNEWT_VAL(OS_CPUTIME_FREQ) == 262144 || \ MYNEWT_VAL(OS_CPUTIME_FREQ) == 524288 #define OS_CPUTIME_FREQ_PWR2 #elif MYNEWT_VAL(OS_CPUTIME_FREQ) > 1000000 #define OS_CPUTIME_FREQ_HIGH #else #error "Invalid OS_CPUTIME_FREQ value. Value must be one of a) a power of 2" \ ">= 256Hz, or b) any value >= 1MHz" #endif #if defined(OS_CPUTIME_FREQ_HIGH) /* CPUTIME data. */ struct os_cputime_data { uint32_t ticks_per_usec; /* number of ticks per usec */ }; extern struct os_cputime_data g_os_cputime; #endif /* Helpful macros to compare cputimes */ /** evaluates to true if t1 is before t2 in time */ #define CPUTIME_LT(__t1, __t2) ((int32_t) ((__t1) - (__t2)) < 0) /** evaluates to true if t1 is after t2 in time */ #define CPUTIME_GT(__t1, __t2) ((int32_t) ((__t1) - (__t2)) > 0) /** evaluates to true if t1 is after t2 in time */ #define CPUTIME_GEQ(__t1, __t2) ((int32_t) ((__t1) - (__t2)) >= 0) /** evaluates to true if t1 is on or after t2 in time */ #define CPUTIME_LEQ(__t1, __t2) ((int32_t) ((__t1) - (__t2)) <= 0) /** * Initialize the cputime module. This must be called after os_init is called * and before any other timer API are used. This should be called only once * and should be called before the hardware timer is used. * * @param clock_freq The desired cputime frequency, in hertz (Hz). * * @return int 0 on success; -1 on error. */ int os_cputime_init(uint32_t clock_freq); /** * Returns the low 32 bits of cputime. * * @return uint32_t The lower 32 bits of cputime */ uint32_t os_cputime_get32(void); #if !defined(OS_CPUTIME_FREQ_PWR2) /** * Converts the given number of nanoseconds into cputime ticks. * Not defined if OS_CPUTIME_FREQ_PWR2 is defined. * * @param usecs The number of nanoseconds to convert to ticks * * @return uint32_t The number of ticks corresponding to 'nsecs' */ uint32_t os_cputime_nsecs_to_ticks(uint32_t nsecs); /** * Convert the given number of ticks into nanoseconds. * Not defined if OS_CPUTIME_FREQ_PWR2 is defined. * * @param ticks The number of ticks to convert to nanoseconds. * * @return uint32_t The number of nanoseconds corresponding to 'ticks' */ uint32_t os_cputime_ticks_to_nsecs(uint32_t ticks); /** * Wait until 'nsecs' nanoseconds has elapsed. This is a blocking delay. * Not defined if OS_CPUTIME_FREQ_PWR2 is defined. * * * @param nsecs The number of nanoseconds to wait. */ void os_cputime_delay_nsecs(uint32_t nsecs); #endif #if defined(OS_CPUTIME_FREQ_1MHZ) #define os_cputime_usecs_to_ticks(x) (x) #define os_cputime_ticks_to_usecs(x) (x) #else /** * Converts the given number of microseconds into cputime ticks. * * @param usecs The number of microseconds to convert to ticks * * @return uint32_t The number of ticks corresponding to 'usecs' */ uint32_t os_cputime_usecs_to_ticks(uint32_t usecs); /** * Convert the given number of ticks into microseconds. * * @param ticks The number of ticks to convert to microseconds. * * @return uint32_t The number of microseconds corresponding to 'ticks' */ uint32_t os_cputime_ticks_to_usecs(uint32_t ticks); #endif /** * Wait until the number of ticks has elapsed. This is a blocking delay. * * @param ticks The number of ticks to wait. */ void os_cputime_delay_ticks(uint32_t ticks); /** * Wait until 'usecs' microseconds has elapsed. This is a blocking delay. * * @param usecs The number of usecs to wait. */ void os_cputime_delay_usecs(uint32_t usecs); /** * Initialize a CPU timer, using the given HAL timer. * * @param timer The timer to initialize. Cannot be NULL. * @param fp The timer callback function. Cannot be NULL. * @param arg Pointer to data object to pass to timer. */ void os_cputime_timer_init(struct hal_timer *timer, hal_timer_cb fp, void *arg); /** * Start a cputimer that will expire at 'cputime'. If cputime has already * passed, the timer callback will still be called (at interrupt context). * * NOTE: This must be called when the timer is stopped. * * @param timer Pointer to timer to start. Cannot be NULL. * @param cputime The cputime at which the timer should expire. * * @return int 0 on success; EINVAL if timer already started or timer struct * invalid * */ int os_cputime_timer_start(struct hal_timer *timer, uint32_t cputime); /** * Sets a cpu timer that will expire 'usecs' microseconds from the current * cputime. * * NOTE: This must be called when the timer is stopped. * * @param timer Pointer to timer. Cannot be NULL. * @param usecs The number of usecs from now at which the timer will expire. * * @return int 0 on success; EINVAL if timer already started or timer struct * invalid */ int os_cputime_timer_relative(struct hal_timer *timer, uint32_t usecs); /** * Stops a cputimer from running. The timer is removed from the timer queue * and interrupts are disabled if no timers are left on the queue. Can be * called even if timer is not running. * * @param timer Pointer to cputimer to stop. Cannot be NULL. */ void os_cputime_timer_stop(struct hal_timer *timer); #ifdef __cplusplus } #endif #endif /* H_OS_CPUTIME_ */ /** * @} OSCPUTime * @} OSKernel */ |