UM0851 datasheet(202/245 Pages) STMICROELECTRONICS

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Audio/video drivers

UM0851

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Doc ID 16604 Rev 2

The API is called only once at the start of bufferization. The only way to change the channel

configuration is by resetting the device. Setting the maximum channel as 'n' (can be 0. 2, 4,

8,16 ) means dividing the buffer memory into 'n' equal blocks.

/* max_chan: specifies the maximum number of channels. It could be 0,2,4,8 or 16. It

will return on success and negative value on error. */

spear_tdm_bfr_max_chan (u32 max_chan);

Frame size configuration

This API configures the number of samples that must be compiled in buffering mode before

switching the banks and interrupting the processor.

/* frame_size: specifies number of samples

It will return zero on success and negative value on error. */

spear_tdm_bfr_frame_size(u32 frame_size);

Getting timeslot information

This API is used to get timeslot information. It returns a pointer to the timeslot structure,

containing the necessary information for switching/bufferization.This information is needed

to start bufferization or switching. It contains the information about endianess of the device,

timeslot number for which the bufferization or switching takes place. It also contains the

information about the channel number for bufferization.

More details on the timeslot structure are given at the beginning of Section 8.2.3: TDM layer

interface

/* Index: represent the timeslot number for which switching/bufferization takes

place. Return timeslot structure on success and zero if the index is greater than the

maximum timeslot value. */

spear_tdm_ts_get(int index);

Get bufferization channel

This API gives the unused channel number for bufferization. If the channel is not available it

will return an error.

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

Note : Not used in switching . */

spear_tdm_bfr_get (struct spear_ts *ts);

struct spear_ts {

endianess;

/* endianness of the device (little ending/big endian)*/

int

ts_index;

/* timeslot number for which bufferization/switching takes

place */

int

bfr_index;

/* represents channel number for bufferization. Valid values

are from 0-15*/

struct spear_ts

*ts_sw; /* */

void __iomem

*io_base_act_mem; /* action memory base address (tdm base

address + action memory base address) */

int

bfr_dir;

/* Direction for the bufferization(IN/OUT/BOTH) */

u16

bfr_active;

/* field value 1 shows bufferization is start,

0 means bufferization is stopped. */

int

status; /* */

UM0851 Datasheet(PDF) 202 Page - STMicroelectronics

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