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142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/*
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* Author: Jon Trulson <jtrulson@ics.com>
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* Copyright (c) 2016 Intel Corporation.
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*
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* based on original C++ driver by
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* Author: Yevgeniy Kiveisha <yevgeniy.kiveisha@intel.com>
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* Copyright (c) 2014 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <assert.h>
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#include <unistd.h>
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#include <upm_utilities.h>
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#include "buzzer.h"
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buzzer_context buzzer_init(int pin)
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{
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buzzer_context dev =
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(buzzer_context)malloc(sizeof(struct _buzzer_context));
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if (!dev)
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return NULL;
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dev->pwm = NULL;
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dev->volume = 0.0;
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dev->initialized = false;
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// make sure MRAA is initialized
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int mraa_rv;
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if ((mraa_rv = mraa_init()) != MRAA_SUCCESS)
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{
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printf("%s: mraa_init() failed (%d).\n", __FUNCTION__, mraa_rv);
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buzzer_close(dev);
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return NULL;
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}
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// MRAA contexts...
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if ( !(dev->pwm = mraa_pwm_init(pin)) )
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{
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printf("%s: mraa_pwm_init() failed\n",
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__FUNCTION__);
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buzzer_close(dev);
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return NULL;
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}
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mraa_pwm_enable(dev->pwm, 1);
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buzzer_set_volume(dev, 1.0);
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dev->initialized = true;
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return dev;
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}
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void buzzer_close(buzzer_context dev)
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{
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assert(dev != NULL);
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if (dev->initialized)
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buzzer_stop_sound(dev);
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if (dev->pwm)
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{
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mraa_pwm_enable(dev->pwm, 0);
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mraa_pwm_close(dev->pwm);
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}
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free(dev);
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}
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void buzzer_set_volume(const buzzer_context dev, float vol)
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{
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assert(dev != NULL);
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dev->volume = vol;
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}
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float buzzer_get_volume(const buzzer_context dev)
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{
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assert(dev != NULL);
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return dev->volume;
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}
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upm_result_t buzzer_play_sound(const buzzer_context dev, int note, int delay)
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{
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assert(dev != NULL);
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if (mraa_pwm_period_us(dev->pwm, note) != MRAA_SUCCESS)
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{
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printf("%s: mraa_pwm_period_us() did not succeed\n", __FUNCTION__);
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}
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if (mraa_pwm_write(dev->pwm, dev->volume * 0.5))
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{
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printf("%s: mraa_pwm_write() failed\n", __FUNCTION__);
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return UPM_ERROR_OPERATION_FAILED;
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}
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if (delay >= 0)
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{
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upm_delay_us(delay);
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return buzzer_stop_sound(dev);
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}
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return UPM_SUCCESS;
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}
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upm_result_t buzzer_stop_sound(const buzzer_context dev)
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{
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assert(dev != NULL);
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mraa_result_t rv = MRAA_SUCCESS;
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rv = mraa_pwm_period_us(dev->pwm, 1);
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rv = mraa_pwm_write(dev->pwm, 0);
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if (rv)
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{
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return UPM_ERROR_OPERATION_FAILED;
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}
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return UPM_SUCCESS;
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}
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