ESP8266 datasheet(83/117 Pages) ESPRESSIF

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10. I2S Module Description

10.2.3. SLC Module Conﬁguration

10.2.3.1.Basic Conﬁguration

The SLC module provides the ESP8266 with DMA service of several modules.

Follow the instructions below so that the SLC module is used for the FIFO transmission of

I2S.

•

Set Bits 12~13 (SLC_MODE) of the SLC_CONF0 to 01.

•

Set Bit 17 (SLC_INFOR_NO_REPLACE) and Bit 16 (SLC_TOKEN_NO_REPLACE) of

the SLC_RX_DSCR_CONF to 01.

10.2.3.2.Write The First Address

Bits 0~19 of SLC_RX_LINK (SLC_TX_LINK) register are the ﬁrst 20 bits of the Rx (Tx)

registration list address. The ﬁrst address of the registration list should be written to be the

10.2.3.3.Start The SLC Transmission

Bit 29 of SLC_RX_LINK (SLC_TX_LINK) register is the control bit for starting the SLC

transmission. In the cache space, register a link list and write the ﬁrst 20 bits of the link

table address to the hardware, and then set bit 29 to 1 to start the SLC transmission.

10.3. API Function Description

The following functions can be found in:

/app/driver/i2s.c and /app/include/driver/i2s.h

eof

Flag of frame end for the end of AMPDU sub-frame the mark isn't needed).

When the MAC transports the frames, it's used in the end of the frame. For

the link in the position of eof the buffer_length[11:0] should be equal to the

length of the remaining frame; otherwise, the mac will report an error.

When the MAC receives the frames, it's used to indicate that the frame has

been received completely and the value is set by hardware.

sub_sof

Flag of sub-frame start. It’s used to differentiate different sub-frames in the

AMPDU. It’s only for MAC transport.

length[11:0]

The actual size of the buffer.

size[11:0]

The total size of the buffer.

buf_ptr[31:0]

The start address of the buffer.

next_link_ptr[31:0]

The start address of the next descripter. When the MAC is receiving the ﬂame, the

value is “0”, indicating that there is no empty buffer to receive any ﬂames.

Field name

Description

Espressif

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2017.05

ESP8266 Datasheet(PDF) 83 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

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