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nuttx/drivers/audio/tone.c
Alin Jerpelea 5e6d58dd03 drivers: Alan Carvalho de Assis: update licenses to Apache 
Alan Carvalho de Assis has submitted the SGA and we can migrate the licenses
 to Apache.

Gregory Nutt has submitted the SGA and we can migrate the licenses
 to Apache.

Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
2021-03-13 05:56:43 -08:00

975 lines
24 KiB
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/****************************************************************************
* drivers/audio/tone.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/* This driver is based on Tone Alarm driver from PX4 project. It was
* modified to become a NuttX driver and to use the Oneshot Timer API.
*
* The PX4 driver is here:
* https://github.com/PX4/Firmware/blob/master/ \
* src/drivers/stm32/tone_alarm/tone_alarm.cpp
*/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include <nuttx/arch.h>
#include <nuttx/timers/pwm.h>
#include <nuttx/timers/oneshot.h>
#include <nuttx/audio/tone.h>
#include <nuttx/semaphore.h>
#include <arch/irq.h>
#ifdef CONFIG_AUDIO_TONE
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Define tone modes */
#define MODE_NORMAL 1
#define MODE_LEGATO 2
#define MODE_STACCATO 3
/* Max tune string length */
#define MAX_TUNE_LEN (1 * 256)
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure describes the state of the upper half driver */
struct tone_upperhalf_s
{
uint8_t crefs; /* The number of times the device has been
* opened */
#ifdef CONFIG_PWM_MULTICHAN
uint8_t channel; /* Output channel that drives the tone. */
#endif
volatile bool started; /* True: pulsed output is being generated */
sem_t exclsem; /* Supports mutual exclusion */
struct pwm_info_s tone; /* Pulsed output for Audio Tone */
struct pwm_lowerhalf_s *devtone;
struct oneshot_lowerhalf_s *oneshot;
};
/****************************************************************************
* Private Data
****************************************************************************/
/* Buffer to store the tune */
static char tune_buf[MAX_TUNE_LEN];
/* Semitone offsets from C for the characters 'A'-'G' */
static const uint8_t g_note_tab[] =
{
9, 11, 0, 2, 4, 5, 7
};
/* Notes in Frequency */
static const uint16_t g_notes_freq[84] =
{
0x0041, 0x0045, 0x0049, 0x004d, 0x0052, 0x0057, 0x005c,
0x0061, 0x0067, 0x006e, 0x0074, 0x007b, 0x0082, 0x008a,
0x0092, 0x009b, 0x00a4, 0x00ae, 0x00b8, 0x00c3, 0x00cf,
0x00dc, 0x00e9, 0x00f6, 0x0105, 0x0115, 0x0125, 0x0137,
0x0149, 0x015d, 0x0171, 0x0187, 0x019f, 0x01b8, 0x01d2,
0x01ed, 0x020b, 0x022a, 0x024b, 0x026e, 0x0293, 0x02ba,
0x02e3, 0x030f, 0x033e, 0x0370, 0x03a4, 0x03db, 0x0416,
0x0454, 0x0496, 0x04dc, 0x0526, 0x0574, 0x05c7, 0x061f,
0x067d, 0x06e0, 0x0748, 0x07b7, 0x082d, 0x08a9, 0x092d,
0x09b9, 0x0a4d, 0x0ae9, 0x0b8f, 0x0c3f, 0x0cfa, 0x0dc0,
0x0e91, 0x0f6f, 0x105a, 0x1152, 0x125a, 0x1372, 0x149a,
0x15d3, 0x171f, 0x187f, 0x19f4, 0x1b80, 0x1d22, 0x1ede
};
/* Global variable used by the tone generator */
static const char *g_tune;
static const char *g_next;
static uint8_t g_tempo;
static uint8_t g_note_mode;
static uint32_t g_note_length;
static uint32_t g_silence_length;
static uint8_t g_octave;
static bool g_repeat;
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static void oneshot_callback(FAR struct oneshot_lowerhalf_s *lower,
FAR void *arg);
static uint32_t note_duration(FAR uint32_t *silence, uint32_t note_length,
uint32_t dots);
static uint32_t rest_duration(uint32_t rest_length, uint32_t dots);
static void start_note(FAR struct tone_upperhalf_s *upper, uint8_t note);
static void stop_note(FAR struct tone_upperhalf_s *upper);
static void start_tune(FAR struct tone_upperhalf_s *upper, const char *tune);
static void next_note(FAR struct tone_upperhalf_s *upper);
static int next_char(void);
static uint8_t next_number(void);
static uint8_t next_dots(void);
static int tone_open(FAR struct file *filep);
static int tone_close(FAR struct file *filep);
static ssize_t tone_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static ssize_t tone_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_toneops =
{
tone_open, /* open */
tone_close, /* close */
tone_read, /* read */
tone_write, /* write */
NULL, /* seek */
NULL, /* ioctl */
NULL /* poll */
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
, NULL /* unlink */
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: oneshot_callback
****************************************************************************/
static void oneshot_callback(FAR struct oneshot_lowerhalf_s *lower,
FAR void *arg)
{
FAR struct tone_upperhalf_s *upper = (FAR struct tone_upperhalf_s *)arg;
audinfo("Oneshot timer expired!\n");
/* Play the next note */
next_note(upper);
}
/****************************************************************************
* Name: note_duration
*
* Description:
* This function calculates the duration in microseconds of play and
* silence for a note given the current tempo, length and mode and the
* number of dots following in the play string.
*
****************************************************************************/
static uint32_t note_duration(FAR uint32_t *silence, uint32_t note_length,
uint32_t dots)
{
uint32_t whole_note_period = (60 * 1000000 * 4) / g_tempo;
uint32_t note_period;
uint32_t dot_extension;
if (note_length == 0)
{
note_length = 1;
}
note_period = whole_note_period / note_length;
switch (g_note_mode)
{
case MODE_NORMAL:
*silence = note_period / 8;
break;
case MODE_STACCATO:
*silence = note_period / 4;
break;
case MODE_LEGATO:
*silence = 0;
break;
default:
auderr("Mode undefined!\n");
break;
}
note_period -= *silence;
dot_extension = note_period / 2;
while (dots--)
{
note_period += dot_extension;
dot_extension /= 2;
}
return note_period;
}
/****************************************************************************
* Name: rest_duration
*
* Description:
* This function calculates the duration in microseconds of a rest
* corresponding to a given note length.
*
****************************************************************************/
static uint32_t rest_duration(uint32_t rest_length, uint32_t dots)
{
uint32_t whole_note_period = (60 * 1000000 * 4) / g_tempo;
uint32_t rest_period;
uint32_t dot_extension;
if (rest_length == 0)
{
rest_length = 1;
}
rest_period = whole_note_period / rest_length;
dot_extension = rest_period / 2;
while (dots--)
{
rest_period += dot_extension;
dot_extension /= 2;
}
return rest_period;
}
/****************************************************************************
* Name: start_note
****************************************************************************/
static void start_note(FAR struct tone_upperhalf_s *upper, uint8_t note)
{
FAR struct pwm_lowerhalf_s *tone = upper->devtone;
upper->tone.frequency = g_notes_freq[note - 1];
#ifdef CONFIG_PWM_MULTICHAN
upper->tone.channels[0].channel = upper->channel;
upper->tone.channels[0].duty = b16HALF;
#else
upper->tone.duty = b16HALF;
#endif
/* REVISIT: Should check the return value */
tone->ops->start(tone, &upper->tone);
}
/****************************************************************************
* Name: stop_note
****************************************************************************/
static void stop_note(FAR struct tone_upperhalf_s *upper)
{
FAR struct pwm_lowerhalf_s *tone = upper->devtone;
#ifdef CONFIG_PWM_MULTICHAN
upper->tone.channels[0].channel = upper->channel;
upper->tone.channels[0].duty = 0;
#else
upper->tone.duty = 0;
#endif
/* REVISIT: Should check the return value */
tone->ops->start(tone, &upper->tone);
}
/****************************************************************************
* Name: start_tune
*
* Description:
* This function starts playing the note.
*
****************************************************************************/
static void start_tune(FAR struct tone_upperhalf_s *upper, const char *tune)
{
FAR struct timespec ts;
/* Kill any current playback */
ONESHOT_CANCEL(upper->oneshot, &ts);
/* Record the tune */
g_tune = tune;
g_next = tune;
/* Initialise player state */
g_tempo = 120;
g_note_length = 4;
g_note_mode = MODE_NORMAL;
g_octave = 4;
g_silence_length = 0;
g_repeat = false;
/* Start playing tune */
next_note(upper);
}
/****************************************************************************
* Name: next_note
*
* Description:
* This function parses the next note out of the string and play it.
*
****************************************************************************/
static void next_note(FAR struct tone_upperhalf_s *upper)
{
uint32_t note;
uint32_t note_length;
uint32_t duration;
uint32_t sec;
uint32_t nsec;
FAR struct timespec ts;
/* Do we have an inter-note gap to wait for? */
if (g_silence_length > 0)
{
stop_note(upper);
duration = g_silence_length;
/* Setup the time duration */
sec = duration / USEC_PER_SEC;
nsec = ((duration) - (sec * USEC_PER_SEC)) * NSEC_PER_USEC;
ts.tv_sec = (time_t) sec;
ts.tv_nsec = (unsigned long)nsec;
ONESHOT_START(upper->oneshot, oneshot_callback, upper, &ts);
g_silence_length = 0;
return;
}
/* Make sure we still have a tune - may be removed by the write / ioctl
* handler
*/
if ((g_next == NULL) || (g_tune == NULL))
{
stop_note(upper);
return;
}
/* Parse characters out of the string until we have resolved a note */
note = 0;
note_length = g_note_length;
while (note == 0)
{
/* We always need at least one character from the string */
int c = next_char();
if (c == 0)
{
goto tune_end;
}
g_next++;
switch (c)
{
uint8_t nt;
/* Select note length */
case 'L':
g_note_length = next_number();
if (g_note_length < 1)
{
auderr("note length too short!\n");
goto tune_error;
}
break;
/* Select octave */
case 'O':
g_octave = next_number();
if (g_octave > 6)
{
g_octave = 6;
}
break;
/* Decrease octave */
case '<':
if (g_octave > 0)
{
g_octave--;
}
break;
/* Increase octave */
case '>':
if (g_octave < 6)
{
g_octave++;
}
break;
/* Select inter-note gap */
case 'M':
c = next_char();
if (c == 0)
{
auderr("no character after M!\n");
goto tune_error;
}
g_next++;
switch (c)
{
case 'N':
g_note_mode = MODE_NORMAL;
break;
case 'L':
g_note_mode = MODE_LEGATO;
break;
case 'S':
g_note_mode = MODE_STACCATO;
break;
case 'F':
g_repeat = false;
break;
case 'B':
g_repeat = true;
break;
default:
auderr("unknown symbol: %c!\n", c);
goto tune_error;
break;
}
/* Pause for a note length */
case 'P':
stop_note(upper);
duration = rest_duration(next_number(), next_dots());
/* Setup the time duration */
sec = duration / USEC_PER_SEC;
nsec = ((duration) - (sec * USEC_PER_SEC)) * NSEC_PER_USEC;
ts.tv_sec = (time_t) sec;
ts.tv_nsec = (unsigned long)nsec;
ONESHOT_START(upper->oneshot, oneshot_callback, upper, &ts);
return;
/* Change tempo */
case 'T':
nt = next_number();
if ((nt >= 32) && (nt <= 255))
{
g_tempo = nt;
}
else
{
auderr("T is out of range 32-255!\n");
goto tune_error;
}
break;
/* Play an arbitrary note */
case 'N':
note = next_number();
if (note > 84)
{
auderr("Note higher than 84!\n");
goto tune_error;
}
/* This is a rest - pause for the current note length */
if (note == 0)
{
duration = rest_duration(g_note_length, next_dots());
/* Setup the time duration */
sec = duration / USEC_PER_SEC;
nsec = ((duration) - (sec * USEC_PER_SEC)) * NSEC_PER_USEC;
ts.tv_sec = (time_t) sec;
ts.tv_nsec = (unsigned long)nsec;
ONESHOT_START(upper->oneshot, oneshot_callback, upper, &ts);
return;
}
break;
/* Play a note in the current octave */
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
case 'G':
note = g_note_tab[c - 'A'] + (g_octave * 12) + 1;
c = next_char();
switch (c)
{
/* Up a semitone */
case '#':
case '+':
if (note < 84)
{
note++;
}
g_next++;
break;
/* Down a semitone */
case '-':
if (note > 1)
{
note--;
}
g_next++;
break;
/* No next char here is OK */
default:
break;
}
/* Shorthand length notation */
note_length = next_number();
if (note_length == 0)
{
note_length = g_note_length;
}
break;
default:
goto tune_error;
}
}
/* Compute the duration of the note and the following silence (if any) */
duration = note_duration(&g_silence_length, note_length, next_dots());
/* Start playing the note */
start_note(upper, note);
/* Setup time duration */
sec = duration / USEC_PER_SEC;
nsec = ((duration) - (sec * USEC_PER_SEC)) * NSEC_PER_USEC;
ts.tv_sec = (time_t) sec;
ts.tv_nsec = (unsigned long)nsec;
/* And arrange a callback when the note should stop */
ONESHOT_START(upper->oneshot, oneshot_callback, upper, &ts);
return;
/* Tune looks bad (unexpected EOF, bad character, etc.) */
tune_error:
auderr("tune error\n");
/* Don't loop on error */
g_repeat = false;
/* Stop (and potentially restart) the tune */
tune_end:
stop_note(upper);
if (g_repeat)
{
start_tune(upper, g_tune);
}
else
{
g_tune = NULL;
}
}
/****************************************************************************
* Name: next_char
*
* Description:
* This function find the next character in the string, discard any
* whitespace and return the canonical (uppercase) version.
*
****************************************************************************/
static int next_char(void)
{
while (isspace(*g_next))
{
g_next++;
}
return toupper(*g_next);
}
/****************************************************************************
* Name: next_number
*
* Description:
* This function extract a number from the string, consuming all the digit
* characters.
*
****************************************************************************/
static uint8_t next_number(void)
{
uint8_t number = 0;
int c;
for (; ; )
{
c = next_char();
if (!isdigit(c))
{
return number;
}
g_next++;
number = (number * 10) + (c - '0');
}
return number;
}
/****************************************************************************
* Name: next_dots
*
* Description:
* This function consumes dot characters from the string, returning the
* number consumed.
*
****************************************************************************/
static uint8_t next_dots(void)
{
uint8_t dots = 0;
while (next_char() == '.')
{
g_next++;
dots++;
}
return dots;
}
/****************************************************************************
* Name: tone_open
*
* Description:
* This function is called whenever the PWM device is opened.
*
****************************************************************************/
static int tone_open(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
FAR struct tone_upperhalf_s *upper = inode->i_private;
uint8_t tmp;
int ret;
audinfo("crefs: %d\n", upper->crefs);
/* Get exclusive access to the device structures */
ret = nxsem_wait(&upper->exclsem);
if (ret < 0)
{
goto errout;
}
/* Increment the count of references to the device.
* If this the first time that the driver has been opened for this device,
* then initialize the device.
*/
tmp = upper->crefs + 1;
if (tmp == 0)
{
/* More than 255 opens; uint8_t overflows to zero */
ret = -EMFILE;
goto errout_with_sem;
}
/* Save the new open count on success */
upper->crefs = tmp;
ret = OK;
errout_with_sem:
nxsem_post(&upper->exclsem);
errout:
return ret;
}
/****************************************************************************
* Name: tone_close
*
* Description:
* This function is called when the PWM device is closed.
*
****************************************************************************/
static int tone_close(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
FAR struct tone_upperhalf_s *upper = inode->i_private;
int ret;
audinfo("crefs: %d\n", upper->crefs);
/* Get exclusive access to the device structures */
ret = nxsem_wait(&upper->exclsem);
if (ret < 0)
{
goto errout;
}
/* Decrement the references to the driver.
* If the reference count will decrement to 0,
* then uninitialize the driver.
*/
if (upper->crefs > 1)
{
upper->crefs--;
}
nxsem_post(&upper->exclsem);
ret = OK;
errout:
return ret;
}
/****************************************************************************
* Name: tone_read
*
* Description:
* A dummy read method. This is provided only to satisfy the VFS layer.
*
****************************************************************************/
static ssize_t tone_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
/* Return zero -- usually meaning end-of-file */
return 0;
}
/****************************************************************************
* Name: tone_write
*
* Description:
* A dummy write method. This is provided only to satisfy the VFS layer.
*
****************************************************************************/
static ssize_t tone_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
FAR struct inode *inode = filep->f_inode;
FAR struct tone_upperhalf_s *upper = inode->i_private;
/* We need to receive a string #RRGGBB = 7 bytes */
if (buffer == NULL)
{
/* Well... nothing to do */
return -EINVAL;
}
if (buflen >= MAX_TUNE_LEN)
{
/* Too big to it inside internal buffer (with extra NUL terminator) */
return -EINVAL;
}
/* Copy music to internal buffer */
memcpy(tune_buf, buffer, buflen);
/* Failsafe NUL terminated string */
tune_buf[buflen] = '\0';
/* Let the music play */
start_tune(upper, tune_buf);
return buflen;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: tone_register
*
* Description:
* This function binds an instance of a "lower half" PWM driver with
* the "upper half" Audio Tone device and registers that device so that can
* be used by application code.
*
*
* Input Parameters:
* path - The full path to the driver to be registers in the NuttX pseudo-
* filesystem. The recommended convention is to name of PWM driver
* as "/dev/tone0".
* tone - A pointer to an instance of lower half PWM
* drivers for the tone device. This instance will be bound to the Audio
* tone driver and must persists as long as that driver persists.
*
* Returned Value:
* Zero on success; a negated errno value on failure.
*
****************************************************************************/
int tone_register(FAR const char *path, FAR struct pwm_lowerhalf_s *tone,
#ifdef CONFIG_PWM_MULTICHAN
int channel,
#endif
FAR struct oneshot_lowerhalf_s *oneshot)
{
FAR struct tone_upperhalf_s *upper;
DEBUGASSERT(path != NULL && tone != NULL);
/* Allocate the upper-half data structure */
upper =
(FAR struct tone_upperhalf_s *)kmm_zalloc(
sizeof(struct tone_upperhalf_s));
if (!upper)
{
auderr("ERROR: Allocation failed\n");
return -ENOMEM;
}
/* Initialize the PWM device structure (it was already zeroed by
* kmm_zalloc()).
*/
nxsem_init(&upper->exclsem, 0, 1);
upper->devtone = tone;
upper->oneshot = oneshot;
#ifdef CONFIG_PWM_MULTICHAN
upper->channel = (uint8_t)channel;
#endif
/* Register the PWM device */
audinfo("Registering %s\n", path);
return register_driver(path, &g_toneops, 0666, upper);
}
#endif /* CONFIG_AUDIO_TONE */
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