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annotate 1wire-config.h @ 0:93d4ddff7dd0

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author Daniel O'Connor <darius@dons.net.au>
date Wed, 04 Jan 2012 23:19:12 +1030
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children be930b34fcd3
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1 /*
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2 * 1 wire header
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3 *
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4 * This is the user servicable stuff - how to do delays and how to
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5 * frob the IO pins.
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6 *
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7 * Copyright (c) 2004-2009
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8 * Daniel O'Connor <darius@dons.net.au>. All rights reserved.
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9 *
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10 * Redistribution and use in source and binary forms, with or without
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11 * modification, are permitted provided that the following conditions
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12 * are met:
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13 * 1. Redistributions of source code must retain the above copyright
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14 * notice, this list of conditions and the following disclaimer.
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15 * 2. Redistributions in binary form must reproduce the above copyright
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16 * notice, this list of conditions and the following disclaimer in the
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17 * documentation and/or other materials provided with the distribution.
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18 *
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19 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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22 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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29 * SUCH DAMAGE.
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30 */
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31
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32 /*
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33 * Alter these for your configuration
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34 */
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35
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36 #define OWBUSINIT()
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37
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38 /* Set the IO to input */
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39 #define OWSETREAD() \
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40 do { \
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41 __asm__ volatile ("" ::: "memory"); \
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42 DDRB &= ~_BV(0); \
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43 PORTB &= ~_BV(0); \
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44 __asm__ volatile ("" ::: "memory"); \
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45 } while (0)
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46
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47 /* Read the 1-wire bus, non-inverting logic */
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48 #define OWREADBUS() (PINB & _BV(0) ? 1 : 0)
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49
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50 /* Set the 1-wire bus to 0
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51 * Drive output low
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52 */
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53 #define OWSETBUSLOW() \
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54 do { \
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55 __asm__ volatile ("" ::: "memory"); \
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56 DDRB |= _BV(0); \
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57 PORTB &= ~_BV(0); \
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58 __asm__ volatile ("" ::: "memory"); \
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59 } while (0)
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60
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61 /* Set the 1-wire bus to 1
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62 * Allow to float, use pullup
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63 */
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64 #define OWSETBUSHIGH() \
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65 do { \
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66 __asm__ volatile ("" ::: "memory"); \
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67 DDRB &= ~_BV(0); \
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68 __asm__ volatile ("" ::: "memory"); \
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69 } while (0)
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70
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71 /* _delay_us can only do a delay of 768/clock_freq */
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72 #if F_CPU > 16000000
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73 #error F_CPU > 16MHz, delays need adjusting
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74 #endif
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75
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76 #define OWDELAY_A _delay_us(6) /* 6 usec */
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77 #define OWDELAY_B do { _delay_us(48); _delay_us(16); } while (0) /* 64 usec */
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78 #define OWDELAY_C do { _delay_us(48); _delay_us(12); } while (0) /* 60 usec */
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79 #define OWDELAY_D _delay_us(10) /* 10 usec */
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80 #define OWDELAY_E _delay_us(9) /* 9 usec */
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81 #define OWDELAY_F do { _delay_us(55); } while (0) /* 55 usec */
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82 #define OWDELAY_G /* 0 usec */
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83 #define OWDELAY_H do { _delay_us(48); _delay_us(48); _delay_us(48); \
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84 _delay_us(48); _delay_us(48); _delay_us(48); _delay_us(48); \
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85 _delay_us(48);_delay_us(48); _delay_us(48); } while (0) /* 480 usec */
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86 #define OWDELAY_I do { _delay_us(48); _delay_us(22); } while (0) /* 70 usec */
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87
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88 #ifdef OW_DEBUG
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89 #define OWPUTS(x) puts_P(x)
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90 #define OWPUTSP(x) puts_P(x)
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91 #define OWPRINTFP(fmt, ...) printf_P(fmt, ## __VA_ARGS__)
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92 #else
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93 #define OWPUTS(x)
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94 #define OWPUTSP(x)
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95 #define OWPRINTFP(fmt, ...)
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96 #endif
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97