buzzer.c File Reference

Control of the buzzer on the UI board. More...

Go to the source code of this file.

Defines
#define	PI   3.14159265
Functions
void	buzzer_off (void)
	Turns the buzzer off.
void	buzzer_on (void)
	Turns the buzzer on.
void	buzzer_set_frequency (int hz)
	Sets the frequency of the buzzer.
void	buzzer_sine (int period)
Variables
int	buzzer_hz = 4000
	The frequency of the buzzer.
int	buzzer_hz_init = 600
int	buzzer_hz_range = 300
int	buzzer_is_on = 0
int	buzzer_period = 3000

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Detailed Description

Control of the buzzer on the UI board.

Example hardware/register setup of PWM for buzzer:

  // *******************************************************************************
  // Buzzer PWM Setup
  // *******************************************************************************
  PINSEL1 &= ~(3<<10);
  PINSEL1 |= (1<<10);  //PWM 5 on Pin P0.21 Enabled (bits 10/11)
  PWMPR = 0; //Will run at maximum rate
  PWMMR0 = 15000; 
  PWMMR5 = 0;
  PWMMCR = (1<<1); //Should set Timer Counter to reset upon reaching Match Register 0
  PWMTCR = (1<<0)|(1<<3); //Enables Timer Counter and PWM Mode.
  PWMPCR = (1<<13); //enable PWM5
  PWMLER = (1<<0)|(1<<5); //update PWMMR values

Author:

Nicolas Williamson

Date:

July 2009

Definition in file buzzer.c.

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Function Documentation

void buzzer_set_frequency

(

int

hz

)

Sets the frequency of the buzzer.

Parameters:

hz

The new frequency of the buzzer.

Definition at line 58 of file buzzer.c.

References buzzer_hz, and buzzer_on().

Referenced by song_update().

                                 {
  buzzer_hz = hz;
  if (buzzer_is_on){
    buzzer_on();
  }
}

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Variable Documentation

int buzzer_hz = 4000

The frequency of the buzzer.

Definition at line 31 of file buzzer.c.

Referenced by buzzer_on(), and buzzer_set_frequency().