I'm using an ESP8266 (NodeMCU v3). I want to set a PIN high if a soft wdt reset occurs (not expecting one). Is there a way I can do that?
Can I attach something on TX pin of the board and watch for crash dump? Maybe another Arduino?
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Only after a crash? After normal reboot, the pin start LOW?– user31481Commented Feb 7, 2018 at 16:26
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Look this link: megunolink.com/articles/…– user31481Commented Feb 7, 2018 at 16:34
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@LookAlterno that's a very useful article and program but it's pretty architecture specific. I don't think there is any way to use it with ESP8266 without an almost complete rewrite of the code.– per1234Commented Feb 7, 2018 at 22:03
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2 Answers
The ESP provides a reset reason API, which lets you differentiate between a crash and a normal reset:
extern "C" {
#include "user_interface.h"
}
const char * const RST_REASONS[] =
{
"REASON_DEFAULT_RST",
"REASON_WDT_RST",
"REASON_EXCEPTION_RST",
"REASON_SOFT_WDT_RST",
"REASON_SOFT_RESTART",
"REASON_DEEP_SLEEP_AWAKE",
"REASON_EXT_SYS_RST"
};
// .. in setup():
const rst_info * resetInfo = system_get_rst_info(); //populate reset info
String diag = String(RST_REASONS[resetInfo->reason]); // turn enum index to string
if(diag == "REASON_SOFT_WDT_RST") digitalWrite(TX, HIGH);// check string, take action
The ESP8266 should hold the pin LOW when it is active, letting it go high then signals that the program has crashed.
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1Can you elaborate on the matter? I need something like that for a project.– user31481Commented Feb 9, 2018 at 21:33
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It sounds like the idea is to drive the pin low when operating properly, but rely on the WDT-triggered reset making it a high impedance input which can be overridden by an external pullup resistor. Commented Feb 11, 2018 at 3:09