Fatal exception 0. Fatal exception

Espressif_Faye wrote:Hi,

Did you use 5V power supply to connect to ESP8266 directly ?

Could you help us debug the hardware of your module following below steps :
1. Measure the voltage of ESP8266’s pin VDD.
2. Use hot air gun to remove the wifi Chip from the PCB board and measure the resisitence of each pin to the ground to check if the chip is broken.
3. Power on the ESP8266 module, measure the voltage of ESP8266’s 3V3 pin.

Thanks for your interest in ESP8266 !

I am using an Adafruit HUZZAH ESP8266 module. This module has an onboard 3.3V regulator.

I measured the voltage on ESP8266 VDD pin
=> 3.3V

I measured all pins of the ESP8266 module against ground
=> all are high resistance, nothing shorted to ground

I removed the metal cover on the ESP8266 module and measured all pins of the Espressif chip against GND
=> all high resistance

I powered the board and measured all VDD pins at the 32pin QFN chip (Tensilica L106??)
Pin 1 + 30 VDDA = 3.3V
Pin 3 + 4 VDD3P3 = 3.3V
Pin 5 VDD_RTC = 0.08V
Pin 12 + 17 VDDPST = 3.3V
Pin 29 VDDD = 3.3V

But something else has changed before I measured all these values and before I removed the metal cover.

A few days ago, when I powered up the module, the blue LED was light up and the red LED was dimmed light up. When I pressed RESET while keeping GPIO0 connected to ground, the blue LED stayed off, the red LED was dimmed light up and I could get the bootloader message over serial connection. I could even program the module, but the program didn’t work (see my first post).

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Today when I powered up the module, none of the LEDs was light up nothing is visible on the serial connection (even at 74880 baud) and even with RESET and GPIO0 on ground I cannot get the module into programming mode anymore.

I guess the module is now complete dead. Looks like I need to buy a new module. Hope it is working longer than this one.

Thanks for your support.

Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)
By Stefa168 - Tue Jun 02, 2015 5:06 pm

  • Stefa168

    • Posts: 1
    • Joined: Sat May 30, 2015 2:59 pm
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- Tue Jun 02, 2015 5:06 pm#19228 Hello everyone
Some days ago I received my ESP-03. After some work I got it to work.
I have been able to update the firmware to the last version of the ‘AT’ one.
Today I changed the firmware to NodeMCU’s latest version. It worked without problems until I connected to a GPIO pin a led through a resistor.

After that, I started to get Fatal Exception (0) errors. I managed to recover the ESP by rewriting its standard firmware.
Unfortunately I needed the NodeMCU FW, so I have written it back in the ESP.

This time, I can’t get it to recover back.

It keeps writing to the console garbage data that can’t be analysed at any baud rate (even 74880):

Code: Select all

How can I fix the module?
Thank you!

- Wed Jun 03, 2015 1:27 pm#19334 Moin,

I would check if flashing really words reliably for you.
To do that I would use esptool.py to burn the original AT firmware and then read the data back from flash and
compare them.
If there is some flashing problem due to flashing itself or communication you should see it.

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My € 0,02


- Wed Jul 15, 2015 6:13 am#23301 To anyone having the same issue, make sure that your device is powered by a 3.3V power source capable of sourcing at least 200 mA of current. Also, remember to add a 10uF or so capacitor on the rails, and position the ESP8266 as close to the capacitor as possible. I was having the above issue too until I added the capacitor; now everything is rock solid.

If that still doesn’t work, then reflashing might be a good idea.

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