Olimex Support Forum

Microcontrollers => ESP8266 => Topic started by: borzo83 on June 15, 2016, 08:51:56 pm

Title: Enter Bootloader with ESP8266 Rev. A
Post by: borzo83 on June 15, 2016, 08:51:56 pm
How can I enter the bootloader mode with an ESP8266-EVB-BAT / MOD-WIFI-ESP8266-DEV (Rev A) without an reset button?

I get this error in Arduino IDE when trying to upload a sketch:

warning: espcomm_sync failed
error: espcomm_open failed
error: espcomm_upload_mem failed

With an ESP8266-EVB-BAT / MOD-WIFI-ESP8266-DEV (Rev B) I had no problems.
Title: Re: Enter Bootloader with ESP8266 Rev. A
Post by: Lurch on June 17, 2016, 06:14:11 pm
On the MOD-WIFI-ESP8266-DEV
You need to set pin 21 (GPIO0) to GND while you reset.
Reset by setting pin 13 (RSTB) to GND
So, the sequence is, set GPIO0 to GND, then RSTB to GND for a moment, and then you'll be in bootloader.
Title: Re: Enter Bootloader with ESP8266 Rev. A
Post by: borzo83 on June 17, 2016, 07:22:54 pm
Thank you for the response, I have tried this without luck.

My question was actually concerning this module:
https://www.olimex.com/Products/IoT/ESP8266-EVB-BAT/open-source-hardware
Title: Re: Enter Bootloader with ESP8266 Rev. A
Post by: borzo83 on June 21, 2016, 11:35:33 pm
Quote from: Lurch on June 17, 2016, 06:14:11 pm
On the MOD-WIFI-ESP8266-DEV
You need to set pin 21 (GPIO0) to GND while you reset.
Reset by setting pin 13 (RSTB) to GND
So, the sequence is, set GPIO0 to GND, then RSTB to GND for a moment, and then you'll be in bootloader.


Finaly that worked for me, only that I pressed and held the onboard BTN and then pressed the onboard RESET Button.
Thanks!