- /* 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 == 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
-
|