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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
*/
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