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/*
* Copyright (C) 2014 INRIA
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup chronos
* @{
*/
/**
* @file
* @brief eZ430-chronos beeper
*
* @author Oliver Hahm <oliver.hahm@inria.fr>
* @author Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
* @author mikoff
*
*/
#include <stdint.h>
#include <stdint.h>
#include <cc430f6137.h>
#include "buzzer.h"
#include "xtimer.h"
void buzzer_beep(uint8_t pitch, uint32_t duration)
{
// Reset TA1R, set up mode, TA1 runs from 32768Hz ACLK
TA1CTL = TACLR | MC_1 | TASSEL__ACLK;
// Set PWM frequency
TA1CCR0 = pitch;
// Enable IRQ, set output mode "toggle"
TA1CCTL0 = OUTMOD_4;
// Allow buzzer PWM output on P2.7
P2SEL |= BIT7;
xtimer_usleep(duration);
// Stop PWM timer
TA1CTL &= ~(BIT4 | BIT5);
// Reset and disable buzzer PWM output
P2OUT &= ~BIT7;
P2SEL &= ~BIT7;
TA1CCTL0 &= ~CCIE;
}