Bricked with baud rate command?

borgdrone7
Posts: 1
Joined: Sun Aug 16, 2015 5:05 pm

Bricked with baud rate command?

Postby borgdrone7 » Sun Aug 16, 2015 5:13 pm

Hi,

I updated my ESP8266 to latest version (0.30 and 1.2) using AT+CIUPDATE and everything was working except that when sending commands to it it sometimes "catches" command sometimes not. So I thought its baud rate it too fast maybe (115200). So I opened in terminal and changed baud rate to 9600 like this:
AT+UART_DEF=9600,8,1,0,3
But now my ESP8266 does not work on any baud rate I tried all of them and all of them produce garbage. Some of them produce garbage but also I can see string Fatal error (28) on some bout rate immediately after reset. When I connect on 76800 I get this:
load 0x3ffe8000, len 776, room 0
tail 8
chksum 0xd9
load 0x3ffe8308, len 412, room 0
tail 12
chksum 0xb9
csum 0xb9
2nd boot version : 1.3(b3)
SPI Speed : 40MHz
SPI Mode : QIO
SPI Flash Size : 8Mbit
jump to run user2
R

Is it bricked with AT+UART_DEF command? Is there any way to recover it? Anyone knows why did it missed receiving commands from time to time in the first place anyway?

Thanks in advance!

ESP_Faye
Posts: 1641
Joined: Mon Oct 27, 2014 11:08 am

Re: Bricked with baud rate command?

Postby ESP_Faye » Tue Aug 18, 2015 1:55 pm

Hi,

Thanks for your interest in ESP8266!

We suggest using "UART_CUR" which would not be saved in flash to try the new configuration first, if it can not work, you can just power off and power on to recover.

The last parameter "3" means UART flow control which needs your UART hardware to support flow control.

Maybe you could try to connect the CTS、RTS, and enable the flow control on your UART tool, and try again.

If it does not work, you need to re-download AT firmware to your module to recover.

Jaiff
Posts: 1
Joined: Wed Nov 11, 2015 1:57 am

Re: Bricked with baud rate command?

Postby Jaiff » Wed Nov 11, 2015 2:05 am

Hi all,

I'm encountering the same issue :(
Due to wrong parameters AT command, I send a baudrate modification with RTC/CTS flow control activated.

Now, I'm unable to connect the system.

How to solve this issue ?

AT version : 0.21.0.0
SDK version : 0.9.5

Thanks a lot
Jeff

ESP_Faye
Posts: 1641
Joined: Mon Oct 27, 2014 11:08 am

Re: Bricked with baud rate command?

Postby ESP_Faye » Fri Nov 13, 2015 10:51 am

Hi,

If you set a baud rate that you can not use, you need to re-burn your flash, download AT bin files into your Flash.

We suggest using "UART_CUR" which would not be saved in flash to try the new configuration first, if it can not work, you can just power off and power on to recover.

The AT firmware :http://bbs.espressif.com/viewtopic.php?f=46&t=1123
Flash Download Tool : http://bbs.espressif.com/viewtopic.php?f=57&p=1658#p1658

Who is online

Users browsing this forum: No registered users and 4 guests