Reset codes

[warren]

The docs give a list of constants for machine.reset_cause()

http://docs.micropython.org/en/latest/e ... chine.html

Numerically these are:

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>>> import machine
>>> machine.PWRON_RESET
0
>>> machine.HARD_RESET
6
>>> machine.WDT_RESET
1
>>> machine.DEEPSLEEP_RESET
5
>>> machine.SOFT_RESET
4

I have a board that is returning a value of 2 for machine.reset_cause() - what cause is this?
Or did I miss a constant in the list?

[platforma]

I can see that machine.reset_cause() directly calls the function from the SDK. If you look in tools/sdk/include/user_interface.h. All the reasons in modmachine are mapped directly to this enum:

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typedef enum {
    REASON_DEFAULT_RST = 0,         /**< normal startup by power on */
        REASON_WDT_RST,             /**< hardware watch dog reset */
        REASON_EXCEPTION_RST,       /**< exception reset, GPIO status won't change */
        REASON_SOFT_WDT_RST,        /**< software watch dog reset, GPIO status won't change */
        REASON_SOFT_RESTART,        /**< software restart ,system_restart , GPIO status won't change */
        REASON_DEEP_SLEEP_AWAKE,    /**< wake up from deep-sleep */
        REASON_EXT_SYS_RST          /**< external system reset */
} rst_reason;

As you can see, we're missing REASON_EXCEPTION_RST, which would be the reset reason in your case. Perhaps we should add that to the esp8266/modmachine.c

[warren]

I can see that machine.reset_cause() directly calls the function from the SDK.<snip>As you can see, we're missing REASON_EXCEPTION_RST, which would be the reset reason in your case. Perhaps we should add that to the esp8266/modmachine.c

That is very, very helpful - thanks

[markxr]

Yes, 2= crash

I've seen it multiple times.

Usually what I do is check the reset code, and try to start up more quickly if it was a crash, but put a delay for normal reset or power on, to give the user time to press ctrl-C