drivers/audio: add support for setting I2S's mclk on CS4344 codec
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.
This commit is contained in:
Tiago Medicci Serrano
Xiang Xiao
parent
41475e11e0
commit
b4b0624f6a
@ -54,6 +54,7 @@
|
||||
* Private Function Prototypes
|
||||
****************************************************************************/
|
||||
|
||||
static int cs4344_setmclkfrequency(FAR struct cs4344_dev_s *priv);
|
||||
static void cs4344_setdatawidth(FAR struct cs4344_dev_s *priv);
|
||||
static void cs4344_setbitrate(FAR struct cs4344_dev_s *priv);
|
||||
|
||||
@ -154,10 +155,138 @@ static const struct audio_ops_s g_audioops =
|
||||
cs4344_release /* release */
|
||||
};
|
||||
|
||||
struct mclk_rate_s
|
||||
{
|
||||
uint32_t mclk_freq; /* Master clock frequency (in Hz) */
|
||||
uint32_t sample_rate; /* Sample rate (in Hz) */
|
||||
uint16_t multiple; /* Multiple of the mclk_freq to the sample_rate */
|
||||
};
|
||||
|
||||
static const struct mclk_rate_s mclk_rate[] =
|
||||
{
|
||||
{
|
||||
8192000, /* mclk_freq */
|
||||
16000, /* sample_rate */
|
||||
512, /* multiple */
|
||||
},
|
||||
{
|
||||
12288000, /* mclk_freq */
|
||||
16000, /* sample_rate */
|
||||
768, /* multiple */
|
||||
},
|
||||
{
|
||||
11289600, /* mclk_freq */
|
||||
22050, /* sample_rate */
|
||||
512, /* multiple */
|
||||
},
|
||||
{
|
||||
8192000, /* mclk_freq */
|
||||
32000, /* sample_rate */
|
||||
256, /* multiple */
|
||||
},
|
||||
{
|
||||
12288000, /* mclk_freq */
|
||||
32000, /* sample_rate */
|
||||
384, /* multiple */
|
||||
},
|
||||
{
|
||||
11289600, /* mclk_freq */
|
||||
44100, /* sample_rate */
|
||||
256, /* multiple */
|
||||
},
|
||||
{
|
||||
16934400, /* mclk_freq */
|
||||
44100, /* sample_rate */
|
||||
384, /* multiple */
|
||||
},
|
||||
{
|
||||
22579200, /* mclk_freq */
|
||||
44100, /* sample_rate */
|
||||
512, /* multiple */
|
||||
},
|
||||
{
|
||||
12288000, /* mclk_freq */
|
||||
48000, /* sample_rate */
|
||||
256, /* multiple */
|
||||
},
|
||||
{
|
||||
18432000, /* mclk_freq */
|
||||
48000, /* sample_rate */
|
||||
384, /* multiple */
|
||||
},
|
||||
{
|
||||
24576000, /* mclk_freq */
|
||||
48000, /* sample_rate */
|
||||
512, /* multiple */
|
||||
},
|
||||
};
|
||||
|
||||
/****************************************************************************
|
||||
* Private Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: cs4344_setmclkfrequency
|
||||
*
|
||||
* Description:
|
||||
* Set the frequency of the Master Clock (MCLK)
|
||||
*
|
||||
* Input Parameters:
|
||||
* priv - A reference to the driver state structure
|
||||
*
|
||||
* Returned Value:
|
||||
* Returns OK or a negated errno value on failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int cs4344_setmclkfrequency(FAR struct cs4344_dev_s *priv)
|
||||
{
|
||||
int ret = OK;
|
||||
int i;
|
||||
|
||||
priv->mclk_freq = 0;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(mclk_rate); i++)
|
||||
{
|
||||
if (mclk_rate[i].sample_rate == priv->samprate)
|
||||
{
|
||||
/* Normally master clock should be multiple of the sample rate
|
||||
* and bclk at the same time. The field mclk_rate_s::multiple
|
||||
* means the multiple of mclk to the sample rate. This value
|
||||
* should be divisible by the size (in bytes) of the sample,
|
||||
* otherwise the ws signal will be inaccurate. For instance,
|
||||
* if data width is 24 bits, in order to keep mclk a multiple
|
||||
* to the bclk, the mclk_rate_s::multiple should be divisible
|
||||
* by the size of the sample, i.e, 24 / 8 = 3.
|
||||
*/
|
||||
|
||||
priv->mclk_freq = mclk_rate[i].mclk_freq;
|
||||
|
||||
/* Check if the current master clock frequency is divisible by
|
||||
* the size (in bytes) of the sample. If so, we have a perfect
|
||||
* match. Otherwise, try to find a more suitable value for the
|
||||
* master clock.
|
||||
*/
|
||||
|
||||
if (mclk_rate[i].multiple % (priv->bpsamp / 8) == 0)
|
||||
{
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (priv->mclk_freq != 0)
|
||||
{
|
||||
ret = I2S_MCLKFREQUENCY(priv->i2s, priv->mclk_freq);
|
||||
}
|
||||
else
|
||||
{
|
||||
ret = -EINVAL;
|
||||
}
|
||||
|
||||
return ret > 0 ? OK : ret;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: cs4344_setdatawidth
|
||||
*
|
||||
@ -407,6 +536,8 @@ cs4344_configure(FAR struct audio_lowerhalf_s *dev,
|
||||
|
||||
case AUDIO_TYPE_OUTPUT:
|
||||
{
|
||||
ret = OK;
|
||||
|
||||
audinfo(" AUDIO_TYPE_OUTPUT:\n");
|
||||
audinfo(" Number of channels: %u\n", caps->ac_channels);
|
||||
audinfo(" Sample rate: %u\n", caps->ac_controls.hw[0]);
|
||||
@ -414,11 +545,11 @@ cs4344_configure(FAR struct audio_lowerhalf_s *dev,
|
||||
|
||||
/* Verify that all of the requested values are supported */
|
||||
|
||||
ret = -ERANGE;
|
||||
if (caps->ac_channels != 1 && caps->ac_channels != 2)
|
||||
{
|
||||
auderr("ERROR: Unsupported number of channels: %d\n",
|
||||
caps->ac_channels);
|
||||
ret = -ERANGE;
|
||||
break;
|
||||
}
|
||||
|
||||
@ -426,6 +557,7 @@ cs4344_configure(FAR struct audio_lowerhalf_s *dev,
|
||||
{
|
||||
auderr("ERROR: Unsupported bits per sample: %d\n",
|
||||
caps->ac_controls.b[2]);
|
||||
ret = -ERANGE;
|
||||
break;
|
||||
}
|
||||
|
||||
@ -435,13 +567,30 @@ cs4344_configure(FAR struct audio_lowerhalf_s *dev,
|
||||
priv->nchannels = caps->ac_channels;
|
||||
priv->bpsamp = caps->ac_controls.b[2];
|
||||
|
||||
/* Reconfigure the FLL to support the resulting number or channels,
|
||||
* bits per sample, and bitrate.
|
||||
/* Reconfigure the master clock to support the resulting number of
|
||||
* channels, data width, and sample rate. However, if I2S lower half
|
||||
* doesn't provide support for setting the master clock, execution
|
||||
* goes on and try just to set the data width and sample rate.
|
||||
*/
|
||||
|
||||
ret = cs4344_setmclkfrequency(priv);
|
||||
if (ret != OK)
|
||||
{
|
||||
if (ret != -ENOTTY)
|
||||
{
|
||||
auderr("ERROR: Unsupported combination of sample rate and"
|
||||
"data width\n");
|
||||
break;
|
||||
}
|
||||
else
|
||||
{
|
||||
audwarn("WARNING: MCLK could not be set on lower half\n");
|
||||
priv->mclk_freq = 0;
|
||||
}
|
||||
}
|
||||
|
||||
cs4344_setdatawidth(priv);
|
||||
cs4344_setbitrate(priv);
|
||||
ret = OK;
|
||||
}
|
||||
break;
|
||||
|
||||
@ -1255,6 +1404,7 @@ static void cs4344_reset(FAR struct cs4344_dev_s *priv)
|
||||
priv->samprate = CS4344_DEFAULT_SAMPRATE;
|
||||
priv->nchannels = CS4344_DEFAULT_NCHANNELS;
|
||||
priv->bpsamp = CS4344_DEFAULT_BPSAMP;
|
||||
priv->mclk_freq = 0;
|
||||
|
||||
/* Configure the FLL and the LRCLK */
|
||||
|
||||
|
||||
@ -41,6 +41,10 @@
|
||||
* Pre-Processor Definitions
|
||||
****************************************************************************/
|
||||
|
||||
#ifndef ARRAY_SIZE
|
||||
# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
|
||||
#endif
|
||||
|
||||
#define CS4344_DEFAULT_SAMPRATE 11025 /* Initial sample rate */
|
||||
#define CS4344_DEFAULT_NCHANNELS 1 /* Initial number of channels */
|
||||
#define CS4344_DEFAULT_BPSAMP 16 /* Initial bits per sample */
|
||||
@ -76,6 +80,7 @@ struct cs4344_dev_s
|
||||
uint16_t samprate; /* Configured samprate (samples/sec) */
|
||||
uint8_t nchannels; /* Number of channels (1 or 2) */
|
||||
uint8_t bpsamp; /* Bits per sample (8 or 16) */
|
||||
uint32_t mclk_freq; /* Master clock frequency */
|
||||
volatile uint8_t inflight; /* Number of audio buffers in-flight */
|
||||
bool running; /* True: Worker thread is running */
|
||||
bool paused; /* True: Playing is paused */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user