Soft reset when watchdogs timer timeout

[snowuyl]

Could I trigger nRF52832 to do soft reset when watchdogs timer timeout?

[Jared]

Hi,

Are you asking about soft reset specifically, or wondering if the nRF52 will do a reset once the watchdog times out?

regards
Jared 

[snowuyl]

I have two questions. The first one is watch dog event handler _wdtEventHandler() is not called after watch dog timer timeout. The second question is can I call NVIC_SystemReset() to do soft reset in watch dog event handler _wdtEventHandler().

The following is testing code.

int main(void) {

    ...

    wdtInit();

    for (;;) {
        wdtFeed();
        while(1); // force watch dog timer timeout

   }

}

[snowuyl]

But my question is why watchdog event handler _wdtEventHandler() is not called. Could you explain about this?

<info> WDT: Function: nrfx_wdt_init, error code: NRF_SUCCESS.
 0> <info> WDT: Function: nrfx_wdt_channel_alloc, error code: NRF_SUCCESS.
 0> <info> WDT: Enabled.
 0> <debug> app: Watchdog timer feed
 0>
 0> <error> app: ERROR 4 [NRF_ERROR_NO_MEM] at ..\..\..\..\..\..\com<error> app: End of error report

[snowuyl]

Can I use NRF_LOG_WARNING() to check if  watchdog event handler _wdtEventHandler() is called? Or I need to use LED to check if  watchdog event handler _wdtEventHandler() is called?

[snowuyl]

I am sure watchdog event handler _wdtEventHandler() is called by checking with LED. But why main() isn't called after calling NVIC_SystemReset().

int main(void) {
    log_init();
    uart_init();
    _showInfo();

   ...

}

static void _showInfo(void) {
    NRF_LOG_INFO("Version %d.%d.%d\n", MAJOR_VER, MINOR_VER, PATCH_VER);
}

I only " app: Version 1.0.0" one time in following log messages. It should be two times if main() is called after system reboot.

0> <info> app: Version 1.0.0
 0>
 0> <info> app: ========| flash info |========
 0> <info> app: erase unit:   4096 bytes
 0> <info> app: program unit: 4 bytes
 0> <info> app: end address: 0x7FFFF
 0> <info> app: ==============================
 0> <info> app_timer: RTC: initialized.
 0> <debug> app: NOR_DATA_PERIOD=819
 0>
 0> <debug> app: NOR_RECORD_PERIOD=8192
 0>
 0> <info> app: bsp_button_longkey_handler 0.
 0> <info> app: POWER_ON.
 0> <info> app: External devices initializing start
 0> <info> app: Reg 0 20
 0> <info> app: Reg 9 A
 0> <info> app: Reg A D
 0> <info> app: Reg 1 B
 0> <info> app: Reg 2 D
 0> <info> app: Reg D F
 0> <info> app: Reg E 13
 0> <info> app: Reg 36 10
 0> <info> app: Reg 37 13
 0> <info> app: Reg 5 11
 0> <info> app: Reg 6 13
 0> <info> app: Reg F 15
 0> <info> app: Reg 10 19
 0> <info> app: Reg 3 16
 0> <info> app: Reg 4 19
 0> <info> app: Reg 7 17
 0> <info> app: Reg 8 19
 0> <info> app: Reg 11 1B
 0> <info> app: Reg 12 1F
 0> <info> app: Reg 43 0
 0> <info> app: Reg 44 0
 0> <info> app: Reg B 1D
 0> <info> app: Reg C 1F
 0> <info> app: Reg 13 21
 0> <info> app: Reg 14 25
 0> <info> app: Reg 1D 3F
 0> <info> app: Reg 64 0
 0> <info> app: Reg 65 27
 0> <info> app: Reg 66 0
 0> <info> app: Reg 67 27
 0> <info> app: Reg 68 0
 0> <info> app: Reg 69 27
 0> <info> app: Reg 52 2C
 0> <info> app: Reg 53 2C
 0> <info> app: Reg 6A 32
 0> <info> app: Reg 6B 38
 0> <info> app: Reg 1E 101
 0> <info> app: Reg 20 3
 0> <info> app: Reg 21 2
 0> <info> app: Reg 22 802084
 0> <info> app: Reg 23 124218
 0> <info> app: Reg 4B F
 0> <info> app: Reg 50 18
 0> <info> app: Reg 31 20
 0> <info> app: Reg 39 5
 0> <info> app: Reg 4E 0
 0> <info> app: Reg 4E 8
 0> <info> app: Reg 45 8
 0> <info> app: Reg 46 13
 0> <info> app: Reg 47 14
 0> <info> app: Reg 48 1F
 0> <info> app: Reg 0 21
 0> <warning> app: nrfx_wdt_init() return 0
 0>
 0> <info> app: External devices initializing finish

[snowuyl]

3542.wdt.h

Fullscreen 4213.wdt.c Download

#include "band_nctu.h"
#include "error.h"
#include "nrf_log.h"
#include "nrfx_wdt.h"
#include "wdt.h"

static bool _gWdtInitialized = false;
static nrfx_wdt_channel_id _gWdtChannelID;

void _wdtReboot(void) {
    NVIC_SystemReset();
}

/*
 *  WDT events handler.
 */
static void _wdtEventHandler(void) {
    NRF_LOG_WARNING("Watchdog timer event handler\n");
    _wdtReboot();
}

int wdtInit(void) {
    ret_code_t errCode;
    nrfx_wdt_config_t wdtConfig = NRFX_WDT_DEAFULT_CONFIG;
	errCode = nrfx_wdt_init(&wdtConfig, _wdtEventHandler);
    if (errCode != NRF_SUCCESS) {
	    NRF_LOG_WARNING("nrfx_wdt_init() failed\n");
        return ERROR_WDT_INITIALIZE_FAIL;
    }
    
	errCode = nrfx_wdt_channel_alloc(&_gWdtChannelID);
	if (errCode != NRF_SUCCESS) {
	    NRF_LOG_WARNING("nrfx_wdt_init() failed\n");
        return ERROR_WDT_INITIALIZE_FAIL;
    }

	nrfx_wdt_enable();

    _gWdtInitialized = true;

    NRF_LOG_WARNING("nrfx_wdt_init() return 0\n");
    return 0;
}

int wdtFeed(void) {
    if (!_gWdtInitialized) {
        return ERROR_WDT_UNINITIALIZED;
    }

    NRF_LOG_DEBUG("Watchdog timer feed\n");
    nrfx_wdt_channel_feed(_gWdtChannelID);

    return 0;
}

[Jared]

snowuyl said:

 0> <error> app: ERROR 4 [NRF_ERROR_NO_MEM] at ..\..\..\..\..\..\com<error> app: End of error report

Something is asserting in your program, a function is returning error code 4. The full error report should specify what function that is returning that code. 

snowuyl said:

But why main() isn't called after calling NVIC_SystemReset().

The CPU will do a reset when this function is called, the program will not return directly to the main loop but would rather start from the beginning again.

regards

Jared 

[snowuyl]

Does Nordic provide API for soft reset and return directly to the main loop?

[Jared]

Hi,

No every type of reset whether it's brownout reset, pin reset, soft reset, power-on-reset, watchdog reset, wake up from system off reset will reset the program. 

regards

Jared