1 /* Teensyduino Core Library
2 * http://www.pjrc.com/teensy/
3 * Copyright (c) 2013 PJRC.COM, LLC.
4 * Modifications by Jacob Alexander 2013-2014
6 * Permission is hereby granted, free of charge, to any person obtaining
7 * a copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sublicense, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * 1. The above copyright notice and this permission notice shall be
15 * included in all copies or substantial portions of the Software.
17 * 2. If the Software is incorporated into a build system that allows
18 * selection among a list of target devices, then similar target
19 * devices manufactured by PJRC.COM must be included in the list of
20 * target devices and selectable in the same manner.
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
26 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
27 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
28 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 // ----- System Includes -----
43 // Convenience Macros, for delay compatibility with AVR-GCC
44 #define _delay_ms(val) delay( val )
45 #define _delay_us(val) delayMicroseconds( val )
49 // ----- Functions -----
51 // the systick interrupt is supposed to increment this at 1 kHz rate
52 extern volatile uint32_t systick_millis_count;
54 static inline uint32_t millis(void) __attribute__((always_inline, unused));
55 static inline uint32_t millis(void)
57 return systick_millis_count; // single aligned 32 bit is atomic;
61 static inline void delayMicroseconds(uint32_t) __attribute__((always_inline, unused));
62 static inline void delayMicroseconds(uint32_t usec)
65 uint32_t n = usec << 5;
66 #elif F_CPU == 48000000
67 uint32_t n = usec << 4;
68 #elif F_CPU == 24000000
69 uint32_t n = usec << 3;
72 "L_%=_delayMicroseconds:" "\n\t"
74 "bne L_%=_delayMicroseconds" "\n"
80 void yield(void) __attribute__ ((weak));
82 uint32_t micros(void);
84 void delay(uint32_t ms);