ESP8266 datasheet(73/117 Pages) ESPRESSIF

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8. HSPI Host Multi-device API

8.3. API Description

Names of the connection modes supported by the system are deﬁned by macro deﬁnitions

\app\include \driver\spi_overlap.h.

•

HSPI_CS_DEV (HSPI default IO)

•

SPI_CS1_DEV (SPI OVERLAP and CS1)

•

SPI_CS2_DEV (SPI OVERLAP and CS2)

Operation with the Flash is deﬁned as SPI_CS0_FLASH. If HSPI operates with two user

devices, the API function is shown as below:

void hspi_master_dev_init(uint8 dev_no,uint8 clk_polar,uint8 clk_div)

HSPI Default IO

MTDI

MISO

MTMS

CLK

SPI OVERLAP and CS1

U0TXD

CS1

SD_CLK

SCLK

SD_DATA0

MISO

SD_DATA1

MOSI

SPI OVERLAP and CS2

GPIO0

CS2

SD_CLK

SCLK

SD_DATA0

MISO

SD_DATA1

MOSI

Mode

Pin Name of Host ESP8266

SPI bus Signal Line

! Note:

The pins used when HSPI operates with the Flash in OVERLAP mode is completely the same with that of SPI

communication.

Function

This function is used to initialize connection of HSPI host. Altogether four user devices can be

operated. If multi devices communicate with the host using SPI communication mode, the

function should be called each time when that certain device is operated.

Location

Deﬁned in directory

\app\include\driver\spi_overlap.h, implemented in directory \app\driver

\spi_overlap.c.

Espressif

! /!

65 104

2017.05

ESP8266 Datasheet(PDF) 73 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

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