153 lines
4.6 KiB
C
153 lines
4.6 KiB
C
/************************************************************************************
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* configs/stm32f103minimum/src/stm32_tone.c
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Alan Carvalho de Assis <acassis@gmail.com>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* 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 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/drivers/pwm.h>
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#include <nuttx/timers/oneshot.h>
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#include <nuttx/audio/tone.h>
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#include <arch/board/board.h>
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#include "chip.h"
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#include "up_arch.h"
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#include "stm32_pwm.h"
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#include "stm32f103_minimum.h"
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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/* Configuration ********************************************************************/
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#define HAVE_TONE 1
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/* TIMx used to generate PWM signal to Buzzer/Speaker */
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#define TONE_PWM_TIMER 2
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/* TIMx used to generate oneshot */
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#define ONESHOT_TIMER 3
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/* Oneshot timer resolution in microseconds */
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#define OST_RES 10
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#ifndef CONFIG_PWM
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# undef HAVE_TONE
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#endif
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#ifndef CONFIG_STM32_TIM2
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# undef HAVE_TONE
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#endif
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#ifndef CONFIG_STM32_TIM2_PWM
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# undef HAVE_TONE
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#endif
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#ifdef HAVE_TONE
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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/************************************************************************************
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* Name: stm32_tone_setup
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*
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* Description:
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* Configure and initialize the tone generator.
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*
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************************************************************************************/
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int stm32_tone_setup(void)
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{
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static bool initialized = false;
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struct pwm_lowerhalf_s *tone;
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struct pwm_info_s info;
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struct oneshot_lowerhalf_s *oneshot = NULL;
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int ret;
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/* Have we already initialized? */
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if (!initialized)
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{
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/* Call stm32_pwminitialize() to get an instance of the PWM interface */
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tone = stm32_pwminitialize(TONE_PWM_TIMER);
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if (!tone)
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{
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auderr("Failed to get the STM32 PWM lower half to AUDIO TONE\n");
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return -ENODEV;
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}
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/* Initialize TONE PWM */
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tone->ops->setup(tone);
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tone->ops->start(tone, &info);
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/* Initialize ONESHOT Timer */
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oneshot = oneshot_initialize(ONESHOT_TIMER, OST_RES);
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if (!oneshot)
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{
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auderr("Failed to initialize ONESHOT Timer!\n");
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return -ENODEV;
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}
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/* Register the Audio Tone driver at "/dev/tone0" */
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ret = tone_register("/dev/tone0", tone, oneshot);
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if (ret < 0)
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{
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auderr("ERROR: tone_register failed: %d\n", ret);
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return ret;
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}
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/* Now we are initialized */
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initialized = true;
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}
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return OK;
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}
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#endif /* HAVE_TONE */
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