86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
/* Teensyduino Core Library
|
|
* http://www.pjrc.com/teensy/
|
|
* Copyright (c) 2013 PJRC.COM, LLC.
|
|
* Modifications by Jacob Alexander 2013-2015
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
// ----- 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);
|
|
|