u-boot/include/sound.h
Simon Glass 7d92b06090 sound: Add sample rate as a parameter for square wave
At present this value is hard-coded in the function that generates a
square wave. Since sample rates vary between different hardware, it makes
more sense to have this as a parameter.

Update the function and its users.

Signed-off-by: Simon Glass <sjg@chromium.org>
2018-11-29 09:30:05 -07:00

57 lines
1.2 KiB
C

/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2012 Samsung Electronics
* R. Chandrasekar < rcsekar@samsung.com>
*/
#ifndef __SOUND_H__
#define __SOUND_H__
/* sound codec enum */
enum en_sound_codec {
CODEC_WM_8994,
CODEC_WM_8995,
CODEC_MAX_98095,
CODEC_MAX
};
/* sound codec enum */
enum sound_compat {
AUDIO_COMPAT_SPI,
AUDIO_COMPAT_I2C,
};
/* Codec information structure to store the info from device tree */
struct sound_codec_info {
int i2c_bus;
int i2c_dev_addr;
enum en_sound_codec codec_type;
};
/*
* Generates square wave sound data for 1 second
*
* @param sample_rate Sample rate in Hz
* @param data data buffer pointer
* @param size size of the buffer
* @param freq frequency of the wave
*/
void sound_create_square_wave(uint sample_rate, unsigned short *data, int size,
uint freq);
/*
* Initialises audio sub system
* @param blob Pointer of device tree node or NULL if none.
* @return int value 0 for success, -1 for error
*/
int sound_init(const void *blob);
/*
* plays the pcm data buffer in pcm_data.h through i2s1 to make the
* sine wave sound
*
* @return int 0 for success, -1 for error
*/
int sound_play(uint32_t msec, uint32_t frequency);
#endif /* __SOUND__H__ */