ref: 45e65b66b11b6b8533b225067ce4c2a4b5eac653
src/libs/mynewt-nimble/porting/nimble/include/os/os_cputime.h
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/* * 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 */ |