ESP8266 Community Forum

- Fri Aug 16, 2019 10:18 am #83491 Very occationally, the ESP8266 module would reset with below bootup print:

Fatal exception (28):
epc1=0x4000df2f, epc2=0x00000000, epc3=0x00000000,
excvaddr=0x00000033, depc=0x00000000


What might be the cause?

Thanks!

Last edited by esp8266_abc on Thu Sep 26, 2019 6:32 pm, edited 1 time in total.

- Sun Aug 18, 2019 6:18 pm #83508 A 28 error is caused by trying to read memory that you're not allowed to for some reason. Could be that you're going off the end of a memory location somewhere

- Wed Aug 21, 2019 10:01 am #83533 The memory addressed is 0x0000007, which indeed cannot be read (zero page) and certainly not word aligned.

The offending code is at 0x4000df2f, if you can find the symbols in your code, you can debug the relevant code.

- Mon Aug 26, 2019 5:12 am #83576 Thanks!

Last edited by esp8266_abc on Thu Sep 26, 2019 6:34 pm, edited 1 time in total.