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4. SPI Communication User Guide

SPI Communication User

Guide

4.1. Overview

4.1.1. Functional Overview

ESP8266 SPI module is used for communication with devices supporting SPI protocols. It

supports the SPI protocol standard of 4 line communication CS, SCLK, MOSI, MISO

the electrical interface. ESP8266 SPI module has special support for FLASH memory in

the SPI interface. Therefore, master and slave SPI module have its corresponding hardware

protocol to match with the SPI communication device.

4.1.2. SPI Features

•

Supports standard master and slave modes;

•

Supports length-programmable hardware commands and addresses, up to 16 bits

and 64 bits;

•

Word-aligned data buffer, up to 64 bytes;

•

Programmable read/write status register in slave mode;

•

Selection of 3 CS pins;

•

Clock frequency up to 80 MHz in master mode and 20 MHz in slave mode;

•

Programmable clock polarity;

•

MSB or LSB ﬁrst;

•

Selection of byte order in SPI buffer transmission;

•

Selection of multiple interrupt sources, including transmit end, read/write data and

read/write status.

4.2. ESP8266 SPI Master Protocol Format

4.2.1. Communication Format Supported by Master

SPI

Master

ESP8266SPI communication format is command+address+read/write data, which

is,

•

Command: a must; length: 1 ~ 16 bits; master output and slave input (MOSI).

•

Address: optional; length: 0 ~ 32 bits master output and slave input (MOSI).

•

Read/write data: optional; length: 0 ~ 512 bits (64 Bytes); master output and slave

input (MOSI) or master input and slave output (MISO).

Espressif

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2017.05

ESP8266 Datasheet(PDF) 29 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

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