Soft reset when watchdogs timer timeout

RE: Soft reset when watchdogs timer timeout

Jared — Tue, 05 Jul 2022 13:51:20 GMT

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

RE: Soft reset when watchdogs timer timeout

snowuyl — Tue, 05 Jul 2022 07:57:21 GMT

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

RE: Soft reset when watchdogs timer timeout

Jared — Tue, 05 Jul 2022 07:48:33 GMT

[quote user="snowuyl"] 0> <error> app: ERROR 4 [NRF_ERROR_NO_MEM] at ..\..\..\..\..\..\com<error> app: End of error report[/quote]

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.

[quote user="snowuyl"]But why main() isn't called after calling NVIC_SystemReset().[/quote]

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

RE: Soft reset when watchdogs timer timeout

snowuyl — Tue, 05 Jul 2022 02:07:21 GMT

devzone.nordicsemi.com/.../3542.wdt.h devzone.nordicsemi.com/.../4213.wdt.c

RE: Soft reset when watchdogs timer timeout

snowuyl — Tue, 05 Jul 2022 02:05:50 GMT

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

RE: Soft reset when watchdogs timer timeout

snowuyl — Mon, 04 Jul 2022 14:31:14 GMT

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?

RE: Soft reset when watchdogs timer timeout

snowuyl — Mon, 04 Jul 2022 14:05:05 GMT

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

RE: Soft reset when watchdogs timer timeout

Jared — Mon, 04 Jul 2022 13:59:50 GMT

It shouldn't be necessary to manually reset when the watchdog expires, that would defeat the whole purpose of having a watchdog. The watchdog should schedule a reset once it expires independently of the CPU. If you were dependent on the CPU reaching some state to do a reset when the watchdog has expired then the watchdog wouldn't be that useful.

RE: Soft reset when watchdogs timer timeout

snowuyl — Mon, 04 Jul 2022 13:56:41 GMT

I have seen the watchdog example. But I don't know what do you mean about "It's not the correct way of using the watchdog". Do you see any problem from my attache files?

RE: Soft reset when watchdogs timer timeout

Jared — Mon, 04 Jul 2022 12:40:23 GMT

Hi,

[quote userid="117187" url="~/f/nordic-q-a/89585/soft-reset-when-watchdogs-timer-timeout/375277"]

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.

[/quote]

It's not the correct way of using the watchdog. The watchdog should do a watchdog reset about two 32 kHz clock cycles after it has been triggered. If the watchdog doesn't trigger then you should check if you have configured it correctly. It would be also nice if you mentioned how you verify whether a watchdog reset has happened or not.

Have you seen the watchdog example in the SDK?

regards

Jared

RE: Soft reset when watchdogs timer timeout

snowuyl — Mon, 04 Jul 2022 09:50:31 GMT

devzone.nordicsemi.com/.../2335.wdt.c devzone.nordicsemi.com/.../5554.wdt.h

RE: Soft reset when watchdogs timer timeout

snowuyl — Mon, 04 Jul 2022 09:49:33 GMT

From the following log messages, nrfx_wdt_init() and nrfx_wdt_channel_alloc return NRF_SUCCESS. But why Watchdog event handler isn't called?

# SEGGER J-Link RTT Viewer V6.32i Terminal Log File
# Compiled: 15:22:50 on Jul 24 2018
# Logging started @ 04 Jul 2022 13:55:29
0> <info> PRS: Function: nrfx_prs_acquire, error code: NRF_SUCCESS.
0> <warning> UARTE: Function: nrfx_uarte_init, error code: NRF_SUCCESS.
0> <info> UARTE: Transfer rx_len: 1.
0> <info> UARTE: Function: nrfx_uarte_rx, error code: NRF_SUCCESS.
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> SAADC: Function: nrfx_saadc_init, error code: NRF_SUCCESS.
0> <info> PRS: Function: nrfx_prs_acquire, error code: NRF_SUCCESS.
0> <warning> UARTE: Function: nrfx_uarte_init, error code: NRF_SUCCESS.
0> <info> UARTE: Transfer rx_len: 1.
0> <info> UARTE: Function: nrfx_uarte_rx, error code: NRF_SUCCESS.
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> SAADC: Function: nrfx_saadc_init, error code: NRF_SUCCESS.
0> <info> SAADC: Function: nrfx_saadc_channel_init, error code: NRF_SUCCESS.
0> <info> SAADC: Function: nrfx_saadc_buffer_convert, buffer length: 1, active channels: 1.
0> <info> SAADC: Function: nrfx_saadc_buffer_convert, error code: NRF_SUCCESS.
0> SS.
0> <debug> SAADC: Event: NRF_SAADC_EVENT_END.
0> <info> app_timer: RTC: initialized.
0> <info> CLOCK: Function: nrfx_clock_init, error code: NRF_SUCCESS.
0> <debug> app: NOR_DATA_PERIOD=819
0>
0> <debug> app: NOR_RECORD_PERIOD=8192
0>
0> <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

RE: Soft reset when watchdogs timer timeout

snowuyl — Mon, 04 Jul 2022 09:47:43 GMT

The following is testing code.

int main(void) {

...

wdtInit();

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

}

RE: Soft reset when watchdogs timer timeout

Jared — Mon, 04 Jul 2022 09:38:01 GMT

Hi,

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

regards
Jared