Revision 891
Moved comments to headers. That was painful.
| buzzer.c | ||
|---|---|---|
| 39 | 39 |
#include <buzzer.h> |
| 40 | 40 |
#include <time.h> |
| 41 | 41 |
|
| 42 |
/** |
|
| 43 |
* @defgroup buzzer Buzzer |
|
| 44 |
* @brief Functions for controlling the buzzer. |
|
| 45 |
* Functions for controlling the buzzer. Include |
|
| 46 |
* buzzer.h to access these functions. |
|
| 47 |
* @{
|
|
| 48 |
**/ |
|
| 49 |
|
|
| 50 |
/** |
|
| 51 |
* Initializes the buzzer. Must be called before any other buzzer |
|
| 52 |
* function may be used. |
|
| 53 |
**/ |
|
| 54 | 42 |
void buzzer_init( void ) |
| 55 | 43 |
{
|
| 56 | 44 |
//NOTE: This is mostly handled by buzzer_Set_val for now |
| ... | ... | |
| 60 | 48 |
//TCCR2 = _BV(COM20) | _BV(WGM21) | _BV(CS22); |
| 61 | 49 |
} |
| 62 | 50 |
|
| 63 |
/** |
|
| 64 |
* Sets the value of the buzzer's pitch. |
|
| 65 |
* Higher values are lower frequencies. |
|
| 66 |
* |
|
| 67 |
* @param buzz_value the value to set the buzzer's frequency too, |
|
| 68 |
* in the range 0-255 |
|
| 69 |
* |
|
| 70 |
* @see buzzer_init, buzzer_set_freq, buzzer_off |
|
| 71 |
**/ |
|
| 72 | 51 |
void buzzer_set_val(unsigned int buzz_value) |
| 73 | 52 |
{
|
| 74 | 53 |
TCCR2 = _BV(COM20) | _BV(WGM21) | _BV(CS22); |
| ... | ... | |
| 76 | 55 |
OCR2 = buzz_value; |
| 77 | 56 |
} |
| 78 | 57 |
|
| 79 |
/** |
|
| 80 |
* Sets the buzzer frequency. Usage of constants such as C4 |
|
| 81 |
* is highly recommended as input to this function. |
|
| 82 |
* buzzer_init must be called before this function may |
|
| 83 |
* be used. |
|
| 84 |
* |
|
| 85 |
* @param buzz_freq the frequency to set the buzzer to |
|
| 86 |
* |
|
| 87 |
* @see buzzer_init, buzzer_set_val, buzzer_off |
|
| 88 |
**/ |
|
| 89 | 58 |
void buzzer_set_freq(unsigned int buzz_freq) |
| 90 | 59 |
{
|
| 91 | 60 |
int buzz_value; |
| ... | ... | |
| 101 | 70 |
buzzer_set_val(buzz_value); |
| 102 | 71 |
} |
| 103 | 72 |
|
| 104 |
/** |
|
| 105 |
* Plays the specified frequency for the specified |
|
| 106 |
* amount of time. This function blocks execution |
|
| 107 |
* until the time is completed. buzzer_init must be |
|
| 108 |
* called before this function can be used. |
|
| 109 |
* |
|
| 110 |
* @param ms the time in milliseconds to play the frequency |
|
| 111 |
* @param buzz_freq the frequency to play |
|
| 112 |
* |
|
| 113 |
* @see buzzer_init, buzzer_set_freq |
|
| 114 |
**/ |
|
| 115 | 73 |
void buzzer_chirp(unsigned int ms, unsigned int buzz_freq) |
| 116 | 74 |
{
|
| 117 | 75 |
buzzer_set_freq(buzz_freq); |
| ... | ... | |
| 119 | 77 |
buzzer_off(); |
| 120 | 78 |
} |
| 121 | 79 |
|
| 122 |
/** |
|
| 123 |
* Turns off the buzzer by disabling the timer0 clock. |
|
| 124 |
* |
|
| 125 |
* @see buzzer_init |
|
| 126 |
**/ |
|
| 127 | 80 |
void buzzer_off() |
| 128 | 81 |
{
|
| 129 | 82 |
// Disable clock, to halt counter |
| ... | ... | |
| 133 | 86 |
PORTB &= 0xBF;//0b10111111; |
| 134 | 87 |
} |
| 135 | 88 |
|
| 136 |
/** @} **/ // end buzzer group |
|
| 137 |
|
|
Also available in: Unified diff