ResetInfo->reason is 6 (REASON_EXT_SYS_RST) even on power up

[Ognian]

Basic Infos

Hardware

Hardware: ESP-12E
Core Version: master @ 85078f4
SDK version 2.0.0 (656edbf)

Description

Load the following sketch into a nodemcu v.1.0; After 5 seconds you will see the output

myResetInfo->reason 6 

this is (maybe) correct since after an upload a reset is triggered.
BUT
disconnect the USB cable, close the serial monitor, connect the USB cable (power on again) and quickly open the serial monitor, you will still see

myResetInfo->reason 6 

but it should be 0 (REASON_DEFAULT_RST)
And no, it is not a hardware problem since with the nodemcu firmware (lua) the reason is read correct...
I suspect the SDK you are using ESP8266 NONOS SDK V2.0.0 patch 20160809but there is a later one used by nodemcu firmware ESP8266 NONOS SDK V2.0.0 20160810

Do you have a better idea?
Please help
Thanks
Ognian

Settings in IDE

Module: nodemcu v.1.0
Flash Size: 4MB
CPU Frequency: 80Mhz
Flash Mode: dio?
Flash Frequency: 40Mhz
Upload Using: SERIAL
Reset Method: nodemcu

Sketch

extern "C" {
#include <user_interface.h> // https://github.com/esp8266/Arduino actually tools/sdk/include
}

void checkForResetButtonPressed() {
    rst_info *myResetInfo;
    delay(5000); // slow down so we really can see the reason!!
    myResetInfo = ESP.getResetInfoPtr();
    Serial.printf("myResetInfo->reason %x \n", myResetInfo->reason); // reason is uint32
    Serial.flush();
}

void setup() {
    // put your setup code here, to run once:
    Serial.begin(115200);
    Serial.println("------");

    checkForResetButtonPressed();
}

void loop() {
}

[devyte]

@Ognian could you please try with the latest git and report back here?

[igrr]

Fwiw, I can confirm this, both in master and SDK 2.1.0 update branch. Not sure what is going on here (i.e. i tried debugging it for an hour, but didn't find what exactly is causing this issue in Arduino core).

[tomdeboer]

I was looking into this just today and noticed the same thing. Do you already have some idea @igrr @Ognian? Something I can look into maybe?

[igrr]

As mentioned above, i have tried debugging but couldn't figure out where the issue comes from. If you can spend some debugging this, that would certainly be appreciated.

[Ognian]

I spent also some time with this; as mentioned above if you use Lua then it works correctly. Since meanwhile SDK's advanced, it is also not very probable that the problem is in the SDK. Since the Lua code is just a SDK call and here too, the only difference could be that some kind of "initialisation" is missing ...

[Macci0]

I have this also with String(ESP.getResetReason()) , ARDUINO_ESP8266_GIT_VER 0x09826c6d, ARDUINO_ESP8266_RELEASE_2_3_0

[5chufti]

Hi,
maybe it is just a problem of NodeMCU after all?

I used this sketch on an ESP-01 with git master from 2017.10.31

struct rst_info {
  uint32 reason;
  uint32 exccause;
  uint32 epc1;
  uint32 epc2;
  uint32 epc3;
  uint32 excvaddr;
  uint32 depc;
};

void setup() {
  rst_info *xyz;

  xyz = ESP.getResetInfoPtr();
  Serial.begin(74880);
  Serial.println("Reason_fn " + String(ESP.getResetReason()));
  Serial.println("Reason_ptr " + String((*xyz).reason));
}

void loop() {
  Serial.println("in loop(), you may now reset, power off/on or wait 5s for 5s deepsleep");
  delay(5000);
  Serial.println("going into deepsleep");
  ESP.deepSleep(5000000);
  delay(10);  
}

I get
"Power on" "0" for power on,
"External System" "6" for reset
"Deep-Sleep Wake" "5" for wake from deepsleep
(others I didn't test)

[max17501b]

I am seeing the same problem, reset reason 6 from cold starts. I'm not using an IDE or Arduino or LUA or NodeMCU -- just an ESP12-S and my code. I obtain the reason code in the first statement in user_init().

I've tested with SDK's downloaded from Espressif versions 2.1.0(116b762) and 2.2.0-dev(9422289) -- both "non-os".

I have the time and motivation to investigate this, but I have no idea how to debug the SDK. If I can help let me know?

Thanks.

[devyte]

@max17501b do you mean you tested with a non-arduino build, or do you mean you replaced this repo's sdk with 2.2(dev)?
Did you erase the entire flash before sketch upload?
Debugging the sdk itself is unlikely, unless you want to go down an assembler rabbit hole from hell, but debugging down to bare sdk calls should be possible.

[5chufti]

Reading this

I am seeing the same problem, reset reason 6 from cold starts. I'm not using an IDE or Arduino or LUA or NodeMCU -- just an ESP12-S and my code. I obtain the reason code in the first statement in user_init().

I'd say he just used bare sdk and C.