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