ESP8266 datasheet(80/117 Pages) ESPRESSIF

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10. I2S Module Description

10.2.1.2.I2S Module Start

Provide a running clock

To start the I2S module to transport or receive data, ﬁrstly you need to provide a running

clock for the I2S by invoking the system function below:

i2c_writeReg_ Mask_def (i2c_bbpll, i2c_bbpll_en_audio_clock_out, 1)

Start the Tx module

Bit 8 in the I2SCONF register is used to start the Tx module.

•

In the master Tx mode, when bit 8 is 1 the Tx mode will output the clock signal, the

left and right channel signals and data. The ﬁrst frame data is 0, and then the FIFO

data will be shifted out.

- If no data is written into the the FIFO, the data line will remain 0.

- If the FIFO has transported all the written data and no new data is written in the

FIFO, the data line will loop the last data in the FIFO.

•

In the slave passive Tx mode, the Tx module will be started when it receives a clock

signal from the Rx module.

Start the Rx module

Bit 9 in the I2SCONF register is used to start the Rx module. In the master receive mode:

•

When bit 9 is 1 the Rx mode will output the clock signal, and sample the data line

and the channel selection line.

•

When bit 9 is 0, it will stop the clock signal transport.

•

In the slave receive mode, it is prepared to receive any data from the master.

10.2.1.3.Tx/Rx FIFO Mode

FIFO access mode

Bit 12 of I2S_FIFO_CONF deﬁnes the access mode of the FIFO.

•

When bit 12 is 1, the SLC will make a DMA operation to the FIFO. Direct access to

the FIFO will be invalid.

•

When bit 12 is 0, the FIFO can be accessed directly by software.

•

The default value of bit12 is 1.

Tx FIFO mode

Bits 13 ~ 15 of

I2S_FIFO_CONF are used to control the transport data format for

i2s_tx_fifo_mod.

Value

Description

16bits_per_channel full data (dual channel, FIFO data organisation, 16 bits data in the left

channel,16 bits data in the right channel, and 16 bits data in the left channel)

Espressif

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2017.05

ESP8266 Datasheet(PDF) 80 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

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