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annotate Lib/delay.h @ 412:e7a3be42ae1e

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Debug code for interconnect cable debugging
author Jacob Alexander <haata@kiibohd.com>
date Sat, 20 Feb 2016 13:27:49 -0800
parents 66eccdd9ced5
children
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1 /* Teensyduino Core Library
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2 * http://www.pjrc.com/teensy/
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3 * Copyright (c) 2013 PJRC.COM, LLC.
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4 * Modifications by Jacob Alexander 2013-2015
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5 *
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6 * Permission is hereby granted, free of charge, to any person obtaining
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7 * a copy of this software and associated documentation files (the
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8 * "Software"), to deal in the Software without restriction, including
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9 * without limitation the rights to use, copy, modify, merge, publish,
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10 * distribute, sublicense, and/or sell copies of the Software, and to
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11 * permit persons to whom the Software is furnished to do so, subject to
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12 * the following conditions:
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13 *
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14 * 1. The above copyright notice and this permission notice shall be
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15 * included in all copies or substantial portions of the Software.
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16 *
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17 * 2. If the Software is incorporated into a build system that allows
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18 * selection among a list of target devices, then similar target
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19 * devices manufactured by PJRC.COM must be included in the list of
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20 * target devices and selectable in the same manner.
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21 *
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22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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23 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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25 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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26 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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27 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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28 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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29 * SOFTWARE.
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30 */
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31
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32 #pragma once
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34 // ----- System Includes -----
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35
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36 #include <stdint.h>
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40 // ----- Macros -----
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41
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42 // Convenience Macros, for delay compatibility with AVR-GCC
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43 #define _delay_ms(val) delay( val )
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44 #define _delay_us(val) delayMicroseconds( val )
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48 // ----- Functions -----
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49
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50 // the systick interrupt is supposed to increment this at 1 kHz rate
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51 extern volatile uint32_t systick_millis_count;
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53 static inline uint32_t millis(void) __attribute__((always_inline, unused));
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54 static inline uint32_t millis(void)
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55 {
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56 return systick_millis_count; // single aligned 32 bit is atomic;
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57 }
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60 static inline void delayMicroseconds(uint32_t) __attribute__((always_inline, unused));
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61 static inline void delayMicroseconds(uint32_t usec)
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62 {
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63 #if F_CPU == 96000000
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64 uint32_t n = usec << 5;
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65 #elif F_CPU == 72000000
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66 uint32_t n = usec << 5; // XXX Not accurate, assembly snippet needs to be updated
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67 #elif F_CPU == 48000000
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68 uint32_t n = usec << 4;
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69 #elif F_CPU == 24000000
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70 uint32_t n = usec << 3;
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71 #endif
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72 asm volatile(
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73 "L_%=_delayMicroseconds:" "\n\t"
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74 "subs %0, #1" "\n\t"
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75 "bne L_%=_delayMicroseconds" "\n"
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76 : "+r" (n) :
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77 );
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78 }
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81 void yield(void) __attribute__ ((weak));
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82
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83 uint32_t micros(void);
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84
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85 void delay(uint32_t ms);
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86