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