ESP8266 Developer Zone

Re: ESP01 - AT 0.40 - Can't save baud rate change

2018-01-03T04:14:56+08:00

For what it's worth, I had the same problem with many different firmwares. I flashed several old ones, including 0.9.2, 1.3.0 and 1.4.0 and none would save the configuration.

In the end I solved it by flashed the newest version (2.0.0, with AT 1.3.0), even though the documentation says it needs 8 MBit it seems to be working fine so far on a 4 MBit chip. I used this guide: https://syonyk.blogspot.com/2016/11/installing-latest-at-firmware-on-4mbit.html#comment-form. So far, version 2.0.0 is the only one that will save the configuration on AT+UART_DEF etc. in a way that survives a reset.

Statistics: Posted by phrxmd — Wed Jan 03, 2018 4:14 am

Re: ESP01 - AT 0.40 - Can't save baud rate change

2016-01-22T23:10:31+08:00

I had AT 0.40 and this worked: AT+UART=19200,8,1,0,0

Statistics: Posted by From Finland — Fri Jan 22, 2016 11:10 pm

Re: ESP01 - AT 0.40 - Can't save baud rate change

2015-12-22T11:05:03+08:00

Hi,

Please use Espressif official Flash Download Tool to write bin files into Flash http://bbs.espressif.com/viewtopic.php?f=57&t=433.

If your problem is still unsolved, please provide the captured picture of ESP Flash Download Tool while downloading.

Thanks for your interest in ESP8266 !

Statistics: Posted by ESP_Faye — Tue Dec 22, 2015 11:05 am

Re: ESP01 - AT 0.40 - Can't save baud rate change

2015-12-16T07:34:46+08:00

Same problem here (with 512kB version). Tried several at-versions up to current 0.51, including at_bin_sdk130.zip posted by Espressif_Faye - the baud rate isn't saved.
Currently I'm using an old version from ai-thinker (9.2.2), but as this version is very unstable this isn't a solution.
The main problem: I want to use the esp with an avr328p with 8MHz, and 115200 is a bad uart speed for this application. If default baud rate would be 9600 like in previous firmware versions, than it wouldn't be such a mess that the baud rate isn't saved. In this case I could program the esp to whatever I want within the avr code after startup, but with 115200 as default this is impossible.

Statistics: Posted by PPahl — Wed Dec 16, 2015 7:34 am

Re: ESP01 - AT 0.40 - Can't save baud rate change

2015-08-28T14:42:20+08:00

I have tested with AT 0.40, AT 0.21 (I can save the baud rate, but as you can see on my other post, the ESP frizee at random time) and the AT version before 0.40 (I d'ont remember the exact version) but not possible to save the baud rate....

I will buy another esp01 (the new version with 1mb flash memory) and I will test again, perheaps my esp01 have a problem ...

Statistics: Posted by hexor — Fri Aug 28, 2015 2:42 pm

Re: ESP01 - AT 0.40 - Can't save baud rate change

2015-08-28T14:05:04+08:00

Hi,

I tested your bin files, it works fine on my ESP01 ..

Is there any version of AT firmware which can work well on your ESP01 ?

Statistics: Posted by ESP_Faye — Fri Aug 28, 2015 2:05 pm

Re: ESP01 - AT 0.40 - Can't save baud rate change

2015-08-26T15:58:52+08:00

I have tested with your bin files, but same result: baud rate not save.

Code:

AT

OK
AT+GMR
AT version:0.40.0.0(Aug  8 2015 14:45:58)
SDK version:1.3.0
compile time:Aug  8 2015 17:35:24
OK
AT+UART_DEF=19200,8,1,0,0

OK

//Change soft baud to 19200
AT

OK
AT+RST

OK
úFX
   Xû
   XJÒBÂXX~
           BbKBà9rb*Ê5ãCÊ^T_Ç^þýùý
           
//Trying to send "AT"
ùù
 
 //Change soft baud to 115200          
 AT

OK
AT

OK

This is my bin files:

sdk130.zip

I don't understand where is the problem

Statistics: Posted by hexor — Wed Aug 26, 2015 3:58 pm

Re: ESP01 - AT 0.40 - Can't save baud rate change

2015-08-26T10:03:44+08:00

Hi,

So sorry that I still can not duplicate your problem..

Here is my test AT bin files, please have a try.

And you could also provide your test bin, I will test it.

Code:

AT+UART_DEF=19200,8,1,0,0

OK
// Change baud rate of PC UART tool to 19200
at

OK
AT+RST

OK
卆鰾a跆黙c1cV匍5BRb/VT毈鬜ル凝汐B
ready
AT

OK

at_bin_sdk130.zip

Statistics: Posted by ESP_Faye — Wed Aug 26, 2015 10:03 am

Re: ESP01 - AT 0.40 - Can't save baud rate change

2015-08-25T16:58:06+08:00

Hi,

I know the baud rate is 115200 after reboot because it's the only baud rate that is good to communicate with the ESP01.
19200 dosen't work and return weird character.

I have already try several UART software and several ESP01.... --> same result

Statistics: Posted by hexor — Tue Aug 25, 2015 4:58 pm

Re: ESP01 - AT 0.40 - Can't save baud rate change

2015-08-25T11:22:35+08:00

Hi,

I tried it on ESP01, but I still can not duplicate your problem...

How did you know that the baud rate change back to 115200 ?

Could you try it with another PC UART tool, for example, “secureCRT” ?

Statistics: Posted by ESP_Faye — Tue Aug 25, 2015 11:22 am

Re: ESP01 - AT 0.40 - Can't save baud rate change

2015-08-24T16:21:23+08:00

I have already use the "SpiAutoSet", I have try to flashing again, but it doesn't work...

After the flashing, all is working, I can change the baud rate, but if I reboot, the baud returning to 115200.

Code:

AT

OK
AT+GMR
AT version:0.40.0.0(Aug  8 2015 14:45:58)
SDK version:1.3.0
compile time:Aug  8 2015 17:35:24
OK
AT+UART_DEF=19200,8,1,0,0

OK
------------ [CHANGING BAUD RATE ON MY SOFTWARE TO 19200 ------------


AT

OK
AT+GMR
AT version:0.40.0.0(Aug  8 2015 14:45:58)
SDK version:1.3.0
compile time:Aug  8 2015 17:35:24
OK

This is the capture during the flash:

And the path are:
eagle.flash.bin0x00000
eagle.irom0text.bin 0x40000
blank.bin0x3e000 & 0x7e000

Thanks for your help

Statistics: Posted by hexor — Mon Aug 24, 2015 4:21 pm

Re: ESP01 - AT 0.40 - Can't save baud rate change

2015-08-24T15:46:44+08:00

Hi,

Please use the Espressif Flash Download Tool and select the "SpiAutoSet" to download firmware.
Then the ESP Flash Download Tool will set the configuration automatically according to your Flash while downloading.

Statistics: Posted by ESP_Faye — Mon Aug 24, 2015 3:46 pm

Re: ESP01 - AT 0.40 - Can't save baud rate change

2015-08-22T14:23:09+08:00

What is the size of your flash ?

Where I can found the size of my flash ?

Thanks,

Statistics: Posted by hexor — Sat Aug 22, 2015 2:23 pm

Re: ESP01 - AT 0.40 - Can't save baud rate change

2015-08-21T10:53:17+08:00

Hi,

What is the size of your flash ?

If your flash size is 512KB, AT_v0.40 can only work well without OTA:
eagle.flash.bin 0x00000
eagle.irom0text.bin 0x40000
blank.bin 0x3e000 & 0x7e000

If your problem is still unsolved, please provide the capture picture of your flash download tool while downloading.

Thanks for your interest in ESP8266 !

Statistics: Posted by ESP_Faye — Fri Aug 21, 2015 10:53 am

ESP01 - AT 0.40 - Can't save baud rate change

2015-08-20T20:14:51+08:00

Hi,

Due to my problem with AT 0.21 (viewtopic.php?f=16&t=976) I want to test with the last update (but I'm still want to understand where is the bug in v0.21).

I have flashed an esp01 with the last AT firmware, but If I want to change the baud rate to 19200 with "AT+UART_DEF=19200,8,1,0,0"
The baud is changed, but If i cut off the power, at the next boot the baud rate is 115200 and not 19200.

Do you know why I can't save this parameter ?

Thanks a lot for your hard work on the esp's World !!!

Statistics: Posted by hexor — Thu Aug 20, 2015 8:14 pm