89 lines
3.1 KiB
C
89 lines
3.1 KiB
C
/****************************************************************************
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* include/nuttx/audio/tone.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_AUDIO_TONE_H
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#define __INCLUDE_NUTTX_AUDIO_TONE_H
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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 <nuttx/compiler.h>
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#include <fixedmath.h>
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#include <nuttx/timers/pwm.h>
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#include <nuttx/fs/ioctl.h>
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#ifdef CONFIG_AUDIO_TONE
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Name: tone_register
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*
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* Description:
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* This function binds an instance of a "lower half" PWM driver with
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* the "upper half" Audio Tone device and registers that device so that can
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* be used by application code.
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*
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*
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* Input Parameters:
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* path - The full path to the driver to be registers in the NuttX pseudo-
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* filesystem. The recommended convention is to name all PWM drivers
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* as "/dev/tone0", "/dev/tone1", etc. where the driver path
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* differs only in the "minor" number at the end of the device name.
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* channel - The the PWM peripheral supports multiple output channels, then
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* this value must be provided to indicate the output channel that drives
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* the tone.
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* tone - A pointer to an instance of lower half PWM driver tone. This
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* instance will be bound to the Audio Tone driver and must persists as
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* long as that driver persists.
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*
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* Returned Value:
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* Zero on success; a negated errno value on failure.
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*
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****************************************************************************/
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int tone_register(FAR const char *path, FAR struct pwm_lowerhalf_s *tone,
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#ifdef CONFIG_PWM_MULTICHAN
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int channel,
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#endif
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FAR struct oneshot_lowerhalf_s *oneshot);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_AUDIO_TONE */
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#endif /* __INCLUDE_NUTTX_AUDIO_TONE_H */
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