UM0851 datasheet(204/245 Pages) STMICROELECTRONICS

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Audio/video drivers

UM0851

204/245

Doc ID 16604 Rev 2

u32 len; /* length of requested data.for single transaction it cannot be greater

than 16 * 1024/bfr_max_channel_ configured.for e.g. if a given timeslot

is configured for 16 channel, then length cannot be greater than 1024

bytes.*/

u32 actual_len; /* Reports bytes transfered to/from the buffer */

/* Function call when request completes.*/

void (*complete)( struct spear_ts *ts , struct spear_tdm_req *);

int status; /* Reports zero or negative error number.*/

struct list_head list; /* request list used by TDM driver.*/

};

Buffer read

This API is used to read n bytes of data from the buffer memory

/* spear_ts: timeslot structure.

spear_tdm_req: tdm request structure. */

spear_tdm_bfr_read(struct spear_ts *spear_ts , struct spear_tdm_req *req );

TDM bufferization start

This API starts bufferization for a single channel and enables the interrupt line. If

bufferization for more than one channel is required, the API needs to be called again for

each channel.

/* spear_ts: timeslot structure.

pcm_synchro: Indicate whether the channel used is narrowband/wideband.

dir: Direction for the bufferization(IN/OUT/BOTH)

Note : Not used in switching. */

spear_tdm_bfr_start(struct spear_ts *ts , u8 pcm_synchro, int dir);

TDM bufferization stop

This API is used to stop TDM bufferization and disable interrupts. It also frees any pending

request.

/* spear_ts: timeslot structure.

Note : Not used in switching. */

spear_tdm_bfr_stop(struct spear_ts *spear_ts);

Bufferization channel free

If the channel is not in use, this API is called to free the unused channel.

/* spear_ts: timeslot structure. Note : Not used in switching.

Return channel number on success and negative value on error. */

spear_tdm_bfr_put(struct spear_ts *ts);

UM0851 Datasheet(PDF) 204 Page - STMicroelectronics