b4b0624f6a
Set the mclk frequency on I2S lower half by 1) checking supported sample rate, data width and mclk multiplier table and 2) setting this value using the I2S_MCLKFREQUENCY macro. I2S driver may or may not implement the i2s_mclkfrequency method for setting the master clock.
105 lines
4.5 KiB
C
105 lines
4.5 KiB
C
/****************************************************************************
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* drivers/audio/cs4344.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 __DRIVERS_AUDIO_CS4344_H
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#define __DRIVERS_AUDIO_CS4344_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 <pthread.h>
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#include <mqueue.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/mutex.h>
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#include <nuttx/fs/ioctl.h>
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#ifdef CONFIG_AUDIO
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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#ifndef ARRAY_SIZE
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# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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#endif
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#define CS4344_DEFAULT_SAMPRATE 11025 /* Initial sample rate */
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#define CS4344_DEFAULT_NCHANNELS 1 /* Initial number of channels */
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#define CS4344_DEFAULT_BPSAMP 16 /* Initial bits per sample */
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct cs4344_dev_s
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{
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/* We are an audio lower half driver (We are also the upper "half" of
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* the CS4344 driver with respect to the board lower half driver).
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*
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* Terminology:
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* Our "lower" half audio instances will be called dev for the publicly
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* visible version and "priv" for the version that only this driver
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* knows. From the point of view of this driver, it is the board lower
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* "half" that is referred to as "lower".
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*/
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struct audio_lowerhalf_s dev; /* CS4344 audio lower half (this device) */
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/* Our specific driver data goes here */
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FAR struct i2s_dev_s *i2s; /* I2S driver to use */
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struct dq_queue_s pendq; /* Queue of pending buffers to be sent */
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struct dq_queue_s doneq; /* Queue of sent buffers to be returned */
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struct file mq; /* Message queue for receiving messages */
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char mqname[16]; /* Our message queue name */
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pthread_t threadid; /* ID of our thread */
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uint32_t bitrate; /* Actual programmed bit rate */
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mutex_t pendlock; /* Protect pendq */
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uint16_t samprate; /* Configured samprate (samples/sec) */
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uint8_t nchannels; /* Number of channels (1 or 2) */
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uint8_t bpsamp; /* Bits per sample (8 or 16) */
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uint32_t mclk_freq; /* Master clock frequency */
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volatile uint8_t inflight; /* Number of audio buffers in-flight */
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bool running; /* True: Worker thread is running */
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bool paused; /* True: Playing is paused */
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bool mute; /* True: Output is muted */
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#ifndef CONFIG_AUDIO_EXCLUDE_STOP
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bool terminating; /* True: Stop requested */
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#endif
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bool reserved; /* True: Device is reserved */
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volatile int result; /* The result of the last transfer */
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#endif /* CONFIG_AUDIO */
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#endif /* __DRIVERS_AUDIO_CS4344_H */
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