root / branches / simulator / projects / libdragonfly / buzzer.c @ 976
History | View | Annotate | Download (2.31 KB)
1 |
/**
|
---|---|
2 |
* Copyright (c) 2007 Colony Project
|
3 |
*
|
4 |
* Permission is hereby granted, free of charge, to any person
|
5 |
* obtaining a copy of this software and associated documentation
|
6 |
* files (the "Software"), to deal in the Software without
|
7 |
* restriction, including without limitation the rights to use,
|
8 |
* copy, modify, merge, publish, distribute, sublicense, and/or sell
|
9 |
* copies of the Software, and to permit persons to whom the
|
10 |
* Software is furnished to do so, subject to the following
|
11 |
* conditions:
|
12 |
*
|
13 |
* The above copyright notice and this permission notice shall be
|
14 |
* included in all copies or substantial portions of the Software.
|
15 |
*
|
16 |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
17 |
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
|
18 |
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
19 |
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
20 |
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
21 |
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
22 |
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
23 |
* OTHER DEALINGS IN THE SOFTWARE.
|
24 |
**/
|
25 |
|
26 |
|
27 |
/**
|
28 |
* @file buzzer
|
29 |
* @brief Functions for using the buzzer
|
30 |
*
|
31 |
* Contains functions for using the buzzer.
|
32 |
*
|
33 |
* @author Colony Project, CMU Robotics Club
|
34 |
*
|
35 |
* much taken from FWR's firefly library (author: Tom Lauwers)
|
36 |
**/
|
37 |
|
38 |
#include <avr/io.h> |
39 |
#include <buzzer.h> |
40 |
#include <time.h> |
41 |
|
42 |
void buzzer_init( void ) |
43 |
{ |
44 |
//NOTE: This is mostly handled by buzzer_Set_val for now
|
45 |
// Set pin B7 to output - B7 is buzzer pin
|
46 |
//DDRB |= _BV(DDB7);
|
47 |
//Fast PWM Mode, Clear OCR0 on compare match and set at bottom, clock/64
|
48 |
//TCCR2 = _BV(COM20) | _BV(WGM21) | _BV(CS22);
|
49 |
} |
50 |
|
51 |
void buzzer_set_val(unsigned int buzz_value) |
52 |
{ |
53 |
TCCR2 = _BV(COM20) | _BV(WGM21) | _BV(CS22); |
54 |
DDRB |= _BV(DDB7); |
55 |
OCR2 = buzz_value; |
56 |
} |
57 |
|
58 |
void buzzer_set_freq(unsigned int buzz_freq) |
59 |
{ |
60 |
int buzz_value;
|
61 |
|
62 |
buzz_value = 62500/buzz_freq - 1; |
63 |
|
64 |
if(buzz_value > 255){ |
65 |
buzz_value = 255;
|
66 |
}else if(buzz_value < 0){ |
67 |
buzz_value = 0;
|
68 |
} |
69 |
|
70 |
buzzer_set_val(buzz_value); |
71 |
} |
72 |
|
73 |
void buzzer_chirp(unsigned int ms, unsigned int buzz_freq) |
74 |
{ |
75 |
buzzer_set_freq(buzz_freq); |
76 |
delay_ms(ms); |
77 |
buzzer_off(); |
78 |
} |
79 |
|
80 |
void buzzer_off()
|
81 |
{ |
82 |
// Disable clock, to halt counter
|
83 |
TCCR2 &= 0xF8;//0b11111000; |
84 |
|
85 |
// Set buzzer pin low in case it's high
|
86 |
PORTB &= 0xBF;//0b10111111; |
87 |
} |
88 |
|