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controller/Lib/delay.h

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/* Teensyduino Core Library
* http://www.pjrc.com/teensy/
* Copyright (c) 2013 PJRC.COM, LLC.
* Modifications by Jacob Alexander 2013-2014
*
* 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:
*
* 1. The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* 2. If the Software is incorporated into a build system that allows
* selection among a list of target devices, then similar target
* devices manufactured by PJRC.COM must be included in the list of
* target devices and selectable in the same manner.
*
* 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.
*/
#ifndef __DELAY_H
#define __DELAY_H
// ----- System Includes -----
#include <stdint.h>
// ----- Macros -----
// Convenience Macros, for delay compatibility with AVR-GCC
#define _delay_ms(val) delay( val )
#define _delay_us(val) delayMicroseconds( val )
// ----- Functions -----
// the systick interrupt is supposed to increment this at 1 kHz rate
extern volatile uint32_t systick_millis_count;
static inline uint32_t millis(void) __attribute__((always_inline, unused));
static inline uint32_t millis(void)
{
return systick_millis_count; // single aligned 32 bit is atomic;
}
static inline void delayMicroseconds(uint32_t) __attribute__((always_inline, unused));
static inline void delayMicroseconds(uint32_t usec)
{
#if F_CPU == 96000000
uint32_t n = usec << 5;
#elif F_CPU == 72000000
uint32_t n = usec << 5; // XXX Not accurate, assembly snippet needs to be updated
#elif F_CPU == 48000000
uint32_t n = usec << 4;
#elif F_CPU == 24000000
uint32_t n = usec << 3;
#endif
asm volatile(
"L_%=_delayMicroseconds:" "\n\t"
"subs %0, #1" "\n\t"
"bne L_%=_delayMicroseconds" "\n"
: "+r" (n) :
);
}
void yield(void) __attribute__ ((weak));
uint32_t micros(void);
void delay(uint32_t ms);
#endif