Softdevice - WDT event not occurring when it hangs

[Neeraj Dhekale]

Hello,

I am using nRF52833 based BE33 (Celium Devices) and using nRF52SDK17.0.2. I am trying to implement WDT and expecting to occur its event when the module becomes hang or any unexpected error occurred. I am purposely written the code where BLE is advertising and after every 1 second I am trying to update BLE advertise data below is the code that does this.

void advertising_update(uint8_t loadcellnumber,uint8_t loadcell_data[])
{
uint32_t err;
  err=  sd_ble_gap_adv_stop(m_advertising.adv_handle);
    APP_ERROR_CHECK(err);
    switch(loadcellnumber){
    case 1:{
      loadcellData[0]=loadcell_data[0];
      loadcellData[1]=loadcell_data[1];
      loadcellData[2]=loadcell_data[2];
      loadcellData[3]=loadcell_data[3];
      break;
      }
    case 2:{
      loadcellData[4]=loadcell_data[0];
      loadcellData[5]=loadcell_data[1];
      loadcellData[6]=loadcell_data[2];
      loadcellData[7]=loadcell_data[3];
      break;
      }
    case 3:{
      loadcellData[8]=loadcell_data[0];
      loadcellData[9]=loadcell_data[1];
      loadcellData[10]=loadcell_data[2];
      loadcellData[11]=loadcell_data[3];
      break;
      }
   }

advertising_init();
advertising_start();
}

WDT code in main.c

#include "nrf_drv_wdt.h"
nrf_drv_wdt_channel_id m_channel_id;

int main(void)
{

//Configure WDT.
    nrf_drv_wdt_config_t config = NRF_DRV_WDT_DEAFULT_CONFIG;
    err_code = nrf_drv_wdt_init(&config, wdt_event_handler);
    APP_ERROR_CHECK(err_code);
    err_code = nrf_drv_wdt_channel_alloc(&m_channel_id);
    APP_ERROR_CHECK(err_code);
    nrf_drv_wdt_enable();
    
    
for (;;)
   {
       idle_state_handle();
       nrf_drv_wdt_feed();
   }
}

I have added below in sdk_config.h file:

// <e> NRFX_WDT_ENABLED - nrfx_wdt - WDT peripheral driver
//==========================================================
#ifndef NRFX_WDT_ENABLED
#define NRFX_WDT_ENABLED 1
#endif
// <o> NRFX_WDT_CONFIG_BEHAVIOUR  - WDT behavior in CPU SLEEP or HALT mode
 
// <1=> Run in SLEEP, Pause in HALT 
// <8=> Pause in SLEEP, Run in HALT 
// <9=> Run in SLEEP and HALT 
// <0=> Pause in SLEEP and HALT 

#ifndef NRFX_WDT_CONFIG_BEHAVIOUR
#define NRFX_WDT_CONFIG_BEHAVIOUR 1
#endif

// <o> NRFX_WDT_CONFIG_RELOAD_VALUE - Reload value in ms  <1-131072000> 


#ifndef NRFX_WDT_CONFIG_RELOAD_VALUE
#define NRFX_WDT_CONFIG_RELOAD_VALUE 20000
#endif

// <o> NRFX_WDT_CONFIG_NO_IRQ  - Remove WDT IRQ handling from WDT driver
 
// <0=> Include WDT IRQ handling 
// <1=> Remove WDT IRQ handling 

#ifndef NRFX_WDT_CONFIG_NO_IRQ
#define NRFX_WDT_CONFIG_NO_IRQ 0
#endif

// <o> NRFX_WDT_CONFIG_IRQ_PRIORITY  - Interrupt priority
 
// <0=> 0 (highest) 
// <1=> 1 
// <2=> 2 
// <3=> 3 
// <4=> 4 
// <5=> 5 
// <6=> 6 
// <7=> 7 

#ifndef NRFX_WDT_CONFIG_IRQ_PRIORITY
#define NRFX_WDT_CONFIG_IRQ_PRIORITY 6
#endif

// <e> NRFX_WDT_CONFIG_LOG_ENABLED - Enables logging in the module.
//==========================================================
#ifndef NRFX_WDT_CONFIG_LOG_ENABLED
#define NRFX_WDT_CONFIG_LOG_ENABLED 0
#endif
// <o> NRFX_WDT_CONFIG_LOG_LEVEL  - Default Severity level
 
// <0=> Off 
// <1=> Error 
// <2=> Warning 
// <3=> Info 
// <4=> Debug 

#ifndef NRFX_WDT_CONFIG_LOG_LEVEL
#define NRFX_WDT_CONFIG_LOG_LEVEL 3
#endif

// <o> NRFX_WDT_CONFIG_INFO_COLOR  - ANSI escape code prefix.
 
// <0=> Default 
// <1=> Black 
// <2=> Red 
// <3=> Green 
// <4=> Yellow 
// <5=> Blue 
// <6=> Magenta 
// <7=> Cyan 
// <8=> White 

#ifndef NRFX_WDT_CONFIG_INFO_COLOR
#define NRFX_WDT_CONFIG_INFO_COLOR 0
#endif

// <o> NRFX_WDT_CONFIG_DEBUG_COLOR  - ANSI escape code prefix.
 
// <0=> Default 
// <1=> Black 
// <2=> Red 
// <3=> Green 
// <4=> Yellow 
// <5=> Blue 
// <6=> Magenta 
// <7=> Cyan 
// <8=> White 

#ifndef NRFX_WDT_CONFIG_DEBUG_COLOR
#define NRFX_WDT_CONFIG_DEBUG_COLOR 0
#endif

// </e>

When when I try to connect to BLE from nRF connect App immediately after 1 seconds below error occurs.

<info> app: GATT ATT MTU on connection 0x0 changed to 247.
<error> app: ERROR 8 [NRF_ERROR_INVALID_STATE] at /home/neeraj/Applications/EmbeddedStudio_ARM_Nordic_v568_linux_x64/nRF5SDK1702d674dde/nRF5_SDK_17.0.2_d674dde/examples/peripheral/iotians_device_loadcell/IG_BLE.c:524 (line number 524 is line number 5 in above example)
PC at: 0x0002B885
<error> app: End of error report

Here was I expecting that the WDT event should occur but it was not.

Please help me. Am I expecting wrong? Please correct me if I am wrong.

Thanks and regards,

Neeraj Dhekale

[Simonr]

Hi

Where have you implemented the Watchdog in your application, and have you checked out the Watchdog API on the Infocenter explaining how the various Watchdog functions work and should be implemented?

Best regards,

Simon

[Neeraj Dhekale]

Hello Simanr,

Thanks for the reply.

Simonr said:

Where have you implemented the Watchdog in your application

I am attaching modified code of WDT example code from SDK location /nRF5_SDK_17.0.2_d674dde/examples/peripheral/wdt

#include <stdbool.h>
#include <stdint.h>

#include "nrf.h"
#include "bsp.h"
#include "app_timer.h"
#include "app_error.h"
#include "nrf_drv_wdt.h"
#include "nrf_drv_clock.h"
#include "nrf_delay.h"
#include "app_util_platform.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
#include "nrf_pwr_mgmt.h"

nrf_drv_wdt_channel_id m_channel_id;

/**
 * @brief WDT events handler.
 */
void wdt_event_handler(void)
{
   
printf("wdt_event_handler");

    //NOTE: The max amount of time we can spend in WDT interrupt is two cycles of 32768[Hz] clock - after that, reset occurs
}

static void log_init(void)
{
   ret_code_t err_code = NRF_LOG_INIT(NULL);
   APP_ERROR_CHECK(err_code);
   NRF_LOG_DEFAULT_BACKENDS_INIT();
}
/**
 * @brief Function for main application entry.
 */
 void feed(){
  nrf_drv_wdt_channel_feed(m_channel_id);
 }

 static void power_management_init(void)
{
   ret_code_t err_code;
   err_code = nrf_pwr_mgmt_init();
   APP_ERROR_CHECK(err_code);
}
static void idle_state_handle(void)
{
   UNUSED_RETURN_VALUE(NRF_LOG_PROCESS());
   nrf_pwr_mgmt_run();
}
int main(void)
{
    uint32_t err_code = NRF_SUCCESS;
log_init();

printf("test");

    //Configure WDT.
    nrf_drv_wdt_config_t config = NRF_DRV_WDT_DEAFULT_CONFIG;
    err_code = nrf_drv_wdt_init(&config, wdt_event_handler);
    APP_ERROR_CHECK(err_code);
    err_code = nrf_drv_wdt_channel_alloc(&m_channel_id);
    APP_ERROR_CHECK(err_code);
    nrf_drv_wdt_enable();
int i=0;
  while(1){

        if(i<30){

        printf("\nhello %d\n",i);
          nrf_delay_ms(1000);
      feed();
      }
i++;
  }
}

sdk_config.h file

// <e> WDT_ENABLED - nrf_drv_wdt - WDT peripheral driver - legacy layer
//==========================================================
#ifndef WDT_ENABLED
#define WDT_ENABLED 1
#endif
// <o> WDT_CONFIG_BEHAVIOUR  - WDT behavior in CPU SLEEP or HALT mode
 
// <1=> Run in SLEEP, Pause in HALT 
// <8=> Pause in SLEEP, Run in HALT 
// <9=> Run in SLEEP and HALT 
// <0=> Pause in SLEEP and HALT 

#ifndef WDT_CONFIG_BEHAVIOUR
#define WDT_CONFIG_BEHAVIOUR 1
#endif

// <o> WDT_CONFIG_RELOAD_VALUE - Reload value  <15-4294967295> 


#ifndef WDT_CONFIG_RELOAD_VALUE
#define WDT_CONFIG_RELOAD_VALUE 2000
#endif

// <o> WDT_CONFIG_IRQ_PRIORITY  - Interrupt priority
 

// <i> Priorities 0,2 (nRF51) and 0,1,4,5 (nRF52) are reserved for SoftDevice
// <0=> 0 (highest) 
// <1=> 1 
// <2=> 2 
// <3=> 3 
// <4=> 4 
// <5=> 5 
// <6=> 6 
// <7=> 7 

#ifndef WDT_CONFIG_IRQ_PRIORITY
#define WDT_CONFIG_IRQ_PRIORITY 6
#endif

// </e>

Simonr said:

have you checked out the Watchdog API on the Infocenter explaining how the various Watchdog functions work and should be implemented?

Yes, I have some doubts regarding WDT_IRQ_CONFIG. Do I need to register IRQ for wdt_event_handler? and NRF_WDT_EVENT_TIMEOUT. How and where I can set NRF_WDT_EVENT_TIMEOUT?

Please let me know if I did anything wrong.

Thanks and regards,

Neeraj Dhekale