5675fb0d73
Don't leave US_PER_MS user-visible. Remove an unnecessary variable. Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
96 lines
3 KiB
C
96 lines
3 KiB
C
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 Perry Hung.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file wirish/include/wirish/wirish_time.h
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* @brief Timing and delay functions.
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*/
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#ifndef _WIRISH_WIRISH_TIME_H_
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#define _WIRISH_WIRISH_TIME_H_
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#include <libmaple/libmaple_types.h>
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#include <libmaple/systick.h>
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#include <wirish/boards.h>
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/**
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* Returns time (in milliseconds) since the beginning of program
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* execution. On overflow, restarts at 0.
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* @see micros()
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*/
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static inline uint32 millis(void) {
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return systick_uptime();
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}
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/**
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* Returns time (in microseconds) since the beginning of program
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* execution. On overflow, restarts at 0.
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* @see millis()
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*/
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static inline uint32 micros(void) {
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uint32 ms;
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uint32 cycle_cnt;
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do {
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ms = millis();
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cycle_cnt = systick_get_count();
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} while (ms != millis());
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#define US_PER_MS 1000
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/* SYSTICK_RELOAD_VAL is 1 less than the number of cycles it
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* actually takes to complete a SysTick reload */
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return ((ms * US_PER_MS) +
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(SYSTICK_RELOAD_VAL + 1 - cycle_cnt) / CYCLES_PER_MICROSECOND);
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#undef US_PER_MS
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}
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/**
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* Delay for at least the given number of milliseconds.
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*
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* Interrupts, etc. may cause the actual number of milliseconds to
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* exceed ms. However, this function will return no less than ms
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* milliseconds from the time it is called.
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*
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* @param ms the number of milliseconds to delay.
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* @see delayMicroseconds()
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*/
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void delay(unsigned long ms);
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/**
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* Delay for at least the given number of microseconds.
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*
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* Interrupts, etc. may cause the actual number of microseconds to
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* exceed us. However, this function will return no less than us
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* microseconds from the time it is called.
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*
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* @param us the number of microseconds to delay.
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* @see delay()
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*/
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void delayMicroseconds(uint32 us);
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#endif
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