Fatal exception (0) problem

[Spud]

Hi, this is my first message in the forum.

Firstly, give you congratulations for the forum, really useful.

Few months ago I bought in Arduex the WiFi module ESP8266, but I didn't try it till two days ago. I follow the steps of your tutorials and when I thought that all was fine, I have connected the module with a terminal software on my computer and constanly, the module gives me this exception:

Fatal exception (0):
epc1=0x40100088, epc2=0x00000000, epc3=0x00000000, exvaddr=0x00000000, depc=0x00000000

I have read the same problems in other users, but I can't know if the problem is the same. I don't know where i have to look for to find the blank.s file.

Tell you that I have the ESP8266EX module, with an 4Mb memory 25Q40BT (26MHz crystal, dual and quad), and I don't know if the problem is to use that memory (<8Mb) in boot option.

This are the parameters i have introduced:
Flash size 8Mbit: 512KB+512KB
boot_v1.2+.bin 0x00000
user1.1024.new.2.bin 0x01000
esp_init_data_default.bin 0xfc000 (optional)
blank.bin 0x7e000 & 0xfe000

Also I have tried with:
boot_v1.2+.bin 0x00000
user1.1024.new.2.bin 0x01000
esp_init_data_default.bin 0x7c000
blank.bin 0x7e000 & 0x3e000

Thanks for your support,
Spud

[ESP_Faye]

Hi,

Yes, you may need a larger flash.
"user1.1024.new.2.bin", the "1024" in the name means that it is for 1024KB flash.

[Spud]

Ok, thanks.

I bought another module with the 8Mb flash. Now, I try to test the module in the hyperterminal and I always receive the same as I write. I mean, if I write "AT" and send it, the response is "AT" and not "OK" or "ERROR". The blue LED blink when I download the firmware but not in the comunication mode (GPIO0 to 3,3v)

The new flash is the EN25Q80A and the parameters I am introducing:
26Mhz crystal, 40Mhz and 80MHz SPI speed, QIO, 8Mbit flash
AT_v0.51 ->
Flash size 8Mbit: 512KB+512KB
boot_v1.2+.bin 0x00000
user1.1024.new.2.bin 0x01000
esp_init_data_default.bin 0xfc000 (optional)
blank.bin 0x7e000 & 0xfe000

Picture of the ESP Flash download tool while downloading:


Thanks!!

[Spud]

Please, could anyone help me? Does the firmware properly installed?

Thank you

[ESP_Faye]

Hi,

Please notice that AT command ends with a new line (\r\n, CR LF).

It seems that you may miss the new line.