MOD-WIFI-ESP8266 Datasheet MOD-WIFI-ESP8266 | P1-P3

CHANGING THE MODES OF

MOD-WIFI-ESP8266

REFERENCE

Revision A, January 2015

All boards produced by Olimex LTD are ROHS compliant

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This evaluation board/kit is intended for use for engineering development, demonstration, or evaluation purposes only

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USED TO CREATE MOD-WIFI-ESP8266. THEY ARE CONSIDERED SUITABLE ONLY

FOR MOD-WIFI-ESP8266.

Page 2 of 4

ESP8266 has three modes of operation: SDIO mode, UART mode and FLASH

mode. By default the board is configured for FLASH mode operation. The

jumpers for the default FLASH mode were set during production as follows:

MTD0 is set to position 0; GPIO0 is set to position 1; GPIO2 is set to

position 1.

To access the other modes you would need to manipulate the on-board SMT

jumpers called MTD0, GPIO0, and GPIO2. They are located at the bottom of

the board near the UEXT connector. Each of the jumpers can be set to

either position 0 or position 1. The jumpers are highlighted on the

picture below:

The positions for the all the modes are printed on the board itself. The

table looks like this:

MODE

JUMPER

MTDO GPIO0 GPIO2

SDIO 1 x x

UART 0 0 1

FLASH (DEFAULT) 0 1 1

For example:

Initially, you can't update the firmware of MOD-WIFI-ESP8266 since by the

board starts in the default FLASH mode. In order to update the firmware

of the board you would need to change the starting mode to UART. This is

done by changing the position of the jumper named GPIO0 to 0. After the

update is done – change the position of GPIO0 back to 1 again.

In order to change the position of an SMT jumper like that you would need

basic soldering skills. There are two things that you would need to do:

Page 3 of 4

P1-P3 P4-P4

MOD-WIFI-ESP8266

Mfr. #:

Buy MOD-WIFI-ESP8266

Manufacturer:

Olimex Ltd.

Description:

WiFi Modules (802.11) ESP8266 WiFi Module

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

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MOD-WIFI-ESP8266