ESP8266 Community Forum

- Fri Oct 31, 2014 9:10 am #2096 Anyone already figured out which reset cause means what?
I already had various reset causes :p but someone maybe has a "official" list ? This would make debugging a bit easier.

Same for boot mode.

- Fri Oct 31, 2014 8:51 pm #2112 No official list, but this is what I gathered from the boot loader (by looking at assembly code, so no warranty whatsoever!)

Code: Select all    reset causes:
        0:
        1: normal boot
        2: reset pin
        3: software reset
        4: watchdog reset

    boot device:
        0:
        1: ram
        3: flash


To read them after boot in code I use this:

Code: Select allstruct bootflags
{
    unsigned char raw_rst_cause : 4;
    unsigned char raw_bootdevice : 4;
    unsigned char raw_bootmode : 4;

    unsigned char rst_normal_boot : 1;
    unsigned char rst_reset_pin : 1;
    unsigned char rst_watchdog : 1;

    unsigned char bootdevice_ram : 1;
    unsigned char bootdevice_flash : 1;
};
struct bootflags bootmode_detect(void) {
    int reset_reason, bootmode;
    asm (
        "movi %0, 0x60000600\n\t"
        "movi %1, 0x60000200\n\t"
        "l32i %0, %0, 0x114\n\t"
        "l32i %1, %1, 0x118\n\t"
        : "+r" (reset_reason), "+r" (bootmode) /* Outputs */
        : /* Inputs (none) */
        : "memory" /* Clobbered */
    );

    struct bootflags flags;

    flags.raw_rst_cause = (reset_reason&0xF);
    flags.raw_bootdevice = ((bootmode>>0x10)&0x7);
    flags.raw_bootmode = ((bootmode>>0x1D)&0x7);

    flags.rst_normal_boot = flags.raw_rst_cause == 0x1;
    flags.rst_reset_pin = flags.raw_rst_cause == 0x2;
    flags.rst_watchdog = flags.raw_rst_cause == 0x4;

    flags.bootdevice_ram = flags.raw_bootdevice == 0x1;
    flags.bootdevice_flash = flags.raw_bootdevice == 0x3;

    return flags;
}

- Sat Nov 01, 2014 9:11 am #2116 great, thanks!

- Sat Nov 01, 2014 3:24 pm #2126 boot spi mode from SPI: 7,7
boot spi mode from UART: 5,7

I don't want to be human! I want to see gamma rays, I want to hear X-rays, and I want to smell dark matter ...
I want to reach out with something other than these prehensile paws and feel the solar wind of a supernova flowing over me.