1 /* Teensyduino Core Library
2 * http://www.pjrc.com/teensy/
3 * Copyright (c) 2013 PJRC.COM, LLC.
4 * Modifications by Jacob Alexander 2013-2015
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
34 // ----- System Includes -----
42 // Convenience Macros, for delay compatibility with AVR-GCC
43 #define _delay_ms(val) delay( val )
44 #define _delay_us(val) delayMicroseconds( val )
48 // ----- Functions -----
50 // the systick interrupt is supposed to increment this at 1 kHz rate
51 extern volatile uint32_t systick_millis_count;
53 static inline uint32_t millis(void) __attribute__((always_inline, unused));
54 static inline uint32_t millis(void)
56 return systick_millis_count; // single aligned 32 bit is atomic;
60 static inline void delayMicroseconds(uint32_t) __attribute__((always_inline, unused));
61 static inline void delayMicroseconds(uint32_t usec)
64 uint32_t n = usec << 5;
65 #elif F_CPU == 72000000
66 uint32_t n = usec << 5; // XXX Not accurate, assembly snippet needs to be updated
67 #elif F_CPU == 48000000
68 uint32_t n = usec << 4;
69 #elif F_CPU == 24000000
70 uint32_t n = usec << 3;
73 "L_%=_delayMicroseconds:" "\n\t"
75 "bne L_%=_delayMicroseconds" "\n"
81 void yield(void) __attribute__ ((weak));
83 uint32_t micros(void);
85 void delay(uint32_t ms);