root / branches / simulator / projects / libdragonfly / buzzer.c @ 976
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1 | 241 | bcoltin | /**
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2 | * Copyright (c) 2007 Colony Project
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3 | *
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4 | * Permission is hereby granted, free of charge, to any person
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5 | * obtaining a copy of this software and associated documentation
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6 | * files (the "Software"), to deal in the Software without
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7 | * restriction, including without limitation the rights to use,
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8 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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9 | * copies of the Software, and to permit persons to whom the
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10 | * Software is furnished to do so, subject to the following
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11 | * conditions:
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12 | *
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13 | * The above copyright notice and this permission notice shall be
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14 | * included in all copies or substantial portions of the Software.
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15 | *
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16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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18 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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22 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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23 | * OTHER DEALINGS IN THE SOFTWARE.
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24 | **/
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25 | 8 | bcoltin | |
26 | 241 | bcoltin | |
27 | /**
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28 | * @file buzzer
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29 | * @brief Functions for using the buzzer
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30 | *
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31 | * Contains functions for using the buzzer.
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32 | *
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33 | * @author Colony Project, CMU Robotics Club
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34 | *
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35 | * much taken from FWR's firefly library (author: Tom Lauwers)
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36 | **/
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37 | |||
38 | 8 | bcoltin | #include <avr/io.h> |
39 | #include <buzzer.h> |
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40 | #include <time.h> |
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41 | |||
42 | void buzzer_init( void ) |
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43 | { |
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44 | //NOTE: This is mostly handled by buzzer_Set_val for now
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45 | // Set pin B7 to output - B7 is buzzer pin
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46 | //DDRB |= _BV(DDB7);
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47 | //Fast PWM Mode, Clear OCR0 on compare match and set at bottom, clock/64
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48 | //TCCR2 = _BV(COM20) | _BV(WGM21) | _BV(CS22);
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49 | } |
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50 | |||
51 | void buzzer_set_val(unsigned int buzz_value) |
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52 | { |
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53 | TCCR2 = _BV(COM20) | _BV(WGM21) | _BV(CS22); |
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54 | DDRB |= _BV(DDB7); |
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55 | OCR2 = buzz_value; |
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56 | } |
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57 | |||
58 | void buzzer_set_freq(unsigned int buzz_freq) |
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59 | { |
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60 | int buzz_value;
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61 | |||
62 | buzz_value = 62500/buzz_freq - 1; |
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63 | |||
64 | if(buzz_value > 255){ |
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65 | buzz_value = 255;
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66 | }else if(buzz_value < 0){ |
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67 | buzz_value = 0;
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68 | } |
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69 | |||
70 | buzzer_set_val(buzz_value); |
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71 | } |
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72 | |||
73 | void buzzer_chirp(unsigned int ms, unsigned int buzz_freq) |
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74 | { |
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75 | buzzer_set_freq(buzz_freq); |
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76 | delay_ms(ms); |
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77 | buzzer_off(); |
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78 | } |
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79 | |||
80 | void buzzer_off()
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81 | { |
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82 | // Disable clock, to halt counter
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83 | TCCR2 &= 0xF8;//0b11111000; |
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84 | |||
85 | // Set buzzer pin low in case it's high
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86 | PORTB &= 0xBF;//0b10111111; |
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87 | } |