hanging ESP.restart()

[Pfannex]

Hi,

what´s the difference between

ESP.reset() and ESP.restart()?

Both work, but sometimes the ESP does not starts again.

working restart:

 ets Jan  8 2013,rst cause:2, boot mode:(3,6)
load 0x4010f000, len 1264, room 16 
tail 0
chksum 0x42
csum 0x42
@cp:0 ld    <------ this means it work

hanging restart:

 ets Jan  8 2013,rst cause:2, boot mode:(1,7)
 ets Jan  8 2013,rst cause:2, boot mode:(1,7)

wdt reset    <----- this means it does not work

[Links2004]

ESP.reset() is a hard reset and can leave some of the registers in the old state which can lead to problems, its more or less like the reset button on the PC.

ESP.restart() tells the SDK to reboot, so its a more clean reboot, use this one if possible.

the boot mode:(1,7) problem is known and only happens at the first restart after serial flashing.
if you do one manual reboot by power or RST pin all will work more info see: #1017

[Pfannex]

OK, thanks for your explanation......

I was reading the ESP.restart() issues.
But is there a final solution or is the, manually reset after serial flashing, the latest work around?

[Links2004]

yes, the manually reset after serial flashing is the latest work around.
the problem is some code in the hard coded Silicium part of the ESP8266.
there may is a register / ram address which store the mode to boot in, but no one has find it yet.
Its dam hard to search for.

[Pfannex]

OK, thanks....

I think, I can live with it...... :-)

[PhilColbert]

Would it be possible for the ESP gurus to write a README guide to the ESP, just a list of known issues that a newbie could read, I just spent a few hours trying to work out why system restart seemingly randomly works... and this is why, would be great to have a list of known strange issues someone just starting with the ESP could read and save a lot of headaches ! :)

For some reason , this only happens with larger programs, if you just upload a program with the system restart command in and that is it, it works fine.... not sure if that helps ?

Thanks

[aidanruff]

I've had the same problem, even with a pull up on GPOIO#0, it didn't work.

Then I reasoned that as I was using GPIO as an output, maybe the hardware wasn't reseting it to an input on a soft reset, so the reset would depend upon the state of GPIO#0.

So, I set GPIO#0 high before doing the restart and it works!

[pyjsql]

i have a solution;
WiFi.forceSleepBegin(); wdt_reset(); ESP.restart(); while(1)wdt_reset();

close WiFi; forceSleepBegin();
and reset wdt contuniously.