125 lines
4.3 KiB
C
125 lines
4.3 KiB
C
/*
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* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup sensortag-cc26xx-buzzer
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* @{
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*
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* \file
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* Driver for the Sensortag-CC26XX Buzzer
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*/
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/*---------------------------------------------------------------------------*/
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#include "contiki-conf.h"
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#include "buzzer.h"
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#include "ti-lib.h"
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#include "lpm.h"
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#include <stdint.h>
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#include <string.h>
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#include <stdio.h>
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/*---------------------------------------------------------------------------*/
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static uint8_t buzzer_on;
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static lpm_power_domain_lock_t lock;
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/*---------------------------------------------------------------------------*/
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void
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buzzer_init()
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{
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buzzer_on = 0;
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/* Drive the I/O ID with GPT0 / Timer A */
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ti_lib_ioc_port_configure_set(BOARD_IOID_BUZZER, IOC_PORT_MCU_PORT_EVENT0,
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IOC_STD_OUTPUT);
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/* GPT0 / Timer A: PWM, Interrupt Enable */
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HWREG(GPT0_BASE + GPT_O_TAMR) = (TIMER_CFG_A_PWM & 0xFF) | GPT_TAMR_TAPWMIE;
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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buzzer_state()
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{
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return buzzer_on;
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}
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/*---------------------------------------------------------------------------*/
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void
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buzzer_start(int freq)
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{
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uint32_t load;
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buzzer_on = 1;
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lpm_pd_lock_obtain(&lock, PRCM_DOMAIN_PERIPH);
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/* Stop the timer */
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ti_lib_timer_disable(GPT0_BASE, TIMER_A);
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if(freq > 0) {
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load = (GET_MCU_CLOCK / freq);
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ti_lib_timer_load_set(GPT0_BASE, TIMER_A, load);
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ti_lib_timer_match_set(GPT0_BASE, TIMER_A, load / 2);
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/* Start */
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ti_lib_timer_enable(GPT0_BASE, TIMER_A);
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}
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/* Run in sleep mode */
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ti_lib_prcm_peripheral_sleep_enable(PRCM_PERIPH_TIMER0);
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ti_lib_prcm_peripheral_deep_sleep_enable(PRCM_PERIPH_TIMER0);
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ti_lib_prcm_load_set();
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while(!ti_lib_prcm_load_get());
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}
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/*---------------------------------------------------------------------------*/
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void
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buzzer_stop()
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{
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buzzer_on = 0;
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lpm_pd_lock_release(&lock);
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/* Stop the timer */
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ti_lib_timer_disable(GPT0_BASE, TIMER_A);
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/*
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* Stop running in sleep mode.
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* ToDo: Currently GPT0 is in use by clock_delay_usec (GPT0/TB) and by this
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* module here (GPT0/TA). clock_delay_usec will never need GPT0/TB in sleep
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* mode and we control TA here. Thus, with the current setup, it's OK to
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* control whether GPT0 runs in sleep mode in this module here. However, if
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* some other module at some point starts using GPT0, we should change this
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* to happen through an umbrella module
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*/
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ti_lib_prcm_peripheral_sleep_disable(PRCM_PERIPH_TIMER0);
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ti_lib_prcm_peripheral_deep_sleep_disable(PRCM_PERIPH_TIMER0);
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ti_lib_prcm_load_set();
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while(!ti_lib_prcm_load_get());
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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