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SAMA5 I2S: Improved I2S buffering

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This commit is contained in:
Gregory Nutt 2013-11-08 16:09:20 -06:00
parent c7cab0a5ff
commit abdd0c637c
3 changed files with 855 additions and 100 deletions
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9
arch/arm/src/sama5/Kconfig
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@ -1380,6 +1380,15 @@ endif # SAMA5_TWI0 || SAMA5_TWI1 || SAMA5_TWI2
if SAMA5_SSC0 || SAMA5_SSC1
menu "SSC Configuration"
config SAMA5_SSC_MAXINFLIGHT
int "SSC queue size"
default 16
---help---
This is the total number of transfers, both RX and TX, that can be
enqueue before the caller is required to wait. This setting
determines the number certain queue data structures that will be
pre-allocated.
if SAMA5_SSC0
comment "SSC0 Configuration"

882
arch/arm/src/sama5/sam_ssc.c
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File diff suppressed because it is too large Load Diff

64
include/nuttx/audio/i2s.h
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@ -76,53 +76,89 @@
* Name: I2S_SEND
*
* Description:
* Send a block of data on I2S. Required.
* Send a block of data on I2S.
*
* Input Parameters:
* dev - Device-specific state data
* buffer - A pointer to the buffer of data to be sent
* nbytes - the length of data to send from the buffer in number of bytes.
* callback - A user provided callback function that will be called at
* the completion of the transfer. The callback will be
* performed in the context of the worker thread.
* arg - An opaque argument that will be provided to the callback
* when the transfer complete.
* timeout - The timeout value to use. The transfer will be canceled
* and an ETIMEDOUT error will be reported if this timeout
* elapsed without completion of the DMA transfer. Units
* are system clock ticks. Zero means no timeout.
*
* Returned Value:
* None
* OK on success; a negated errno value on failure. NOTE: This function
* only enqueues the transfer and returns immediately. Success here only
* means that the transfer was enqueued correctly.
*
* When the transfer is complete, a 'result' value will be provided as
* an argument to the callback function that will indicate if the transfer
* failed.
*
****************************************************************************/
#define I2S_SEND(d,b,n) ((d)->ops->i2s_send(d,b,n))
#define I2S_SEND(d,b,n,c,a,t) ((d)->ops->i2s_send(d,b,n,c,a,t))
/****************************************************************************
* Name: I2S_RECEIVE
*
* Description:
* Receive a block of data from I2S. Required.
* Receive a block of data from I2S.
*
* Input Parameters:
* dev - Device-specific state data
* buffer - A pointer to the buffer in which to recieve data
* nbytes - The length of data that can be received in the buffer in number
* of bytes.
* dev - Device-specific state data
* buffer - A pointer to the buffer in which to recieve data
* nbytes - The length of data that can be received in the buffer in number
* of bytes.
* callback - A user provided callback function that will be called at
* the completion of the transfer. The callback will be
* performed in the context of the worker thread.
* arg - An opaque argument that will be provided to the callback
* when the transfer complete.
* timeout - The timeout value to use. The transfer will be canceled
* and an ETIMEDOUT error will be reported if this timeout
* elapsed without completion of the DMA transfer. Units
* are system clock ticks. Zero means no timeout.
*
* Returned Value:
* None
* OK on success; a negated errno value on failure. NOTE: This function
* only enqueues the transfer and returns immediately. Success here only
* means that the transfer was enqueued correctly.
*
* When the transfer is complete, a 'result' value will be provided as
* an argument to the callback function that will indicate if the transfer
* failed.
*
****************************************************************************/
#define I2S_RECEIVE(d,b,n) ((d)->ops->i2s_receive(d,b,n))
#define I2S_RECEIVE(d,b,n,c,a,t) ((d)->ops->i2s_receive(d,b,n,c,a,t))
/****************************************************************************
* Public Types
****************************************************************************/
/* Transfer complete callback */
typedef CODE void (*i2s_callback_t)(FAR struct i2s_dev_s *dev,
FAR const void *buffer, size_t nbytes,
FAR void *arg, int result);
/* The I2S vtable */
struct i2s_dev_s;
struct i2s_ops_s
{
uint32_t (*i2s_frequency)(FAR struct i2s_dev_s *dev, uint32_t frequency);
void (*i2s_send)(FAR struct i2s_dev_s *dev, FAR const void *buffer,
size_t nbytes);
void (*i2s_receive)(FAR struct i2s_dev_s *dev, FAR void *buffer,
size_t nbytes);
int (*i2s_send)(FAR struct i2s_dev_s *dev, FAR const void *buffer,
size_t nbytes, i2s_callback_t callback,
FAR void *arg, uint32_t timeout);
int (*i2s_receive)(FAR struct i2s_dev_s *dev, FAR void *buffer,
size_t nbytes, i2s_callback_t callback,
FAR void *arg, uint32_t timeout);
};
/* I2S private data. This structure only defines the initial fields of the