UM0851 datasheet(203/245 Pages) STMICROELECTRONICS

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UM0851

Audio/video drivers

Doc ID 16604 Rev 2

203/245

struct list_head rx_list; /* List for received request */

struct list_head tx_list; /* List for transmit request */

};

TDM switching start

This API is used to activate TDM switching.

/* spear_ts : timeslot structure (as explained above)

pcm_synchro: indicate whether the channel used is narrowband/wideband Inside

buffer bank, memory pointer increases differently for each frame, according to the

kind of frame. Frame types are :

TDM_NARROWBAND_COMPANDED :

Companded (8 bit) samples, the pointer will progress

by 1 byte at each frame.

TDM_NARRORBAND_LINEAR:

Linear (16 bits) samples, the pointer will progress

by 2 bytes at each frame. The two bytes will be in

consecutive timeslots.

TDM_WIDEBAND_COMPANDED:

the pointer will also progress by 2 bytes at each

frame. The first sample will be in the first half of

the frame and the second sample in the second half.

TDM_WIDEBAND_LINEAR:

For wideband linear samples, the pointer will

progress by 4 bytes at each frame. Two bytes are

located in the first half of the frame, two other in

the second half.

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

Note: Not used in bufferization. */

spear_tdm_sw_start (struct spear_ts *ts1 , struct spear_ts *ts2 , u8 pcm_synchro ,

int dir);

TDM switching stop

This API is used to deactivate TDM switching.

/* spear_ts: timeslot structure (as explained above)

The api will stop switching operation for the given timeslot.

Note: Not used in bufferization.*/

spear_tdm_sw_stop(struct spear_ts *ts);

Buffer write

This API is used to write data to the buffer memory. The information concerning the data

(data pointer, data length, …) are in the struct spear_tdm_request.

/* spear_ts: timeslot structure. (as explained above)

spear_tdm_req: transmit request. Every request is added in tx_list,On reception of

interrupt req will be extracted from the tx_list and served. spear_tdm_req: structure

describe one i/o request.

Note: Not used in switching.*/

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

struct spear_tdm_req {

u8 *buf; /* Buffer used for data storage */

UM0851 Datasheet(PDF) 203 Page - STMicroelectronics

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