Correct method to reset MKW01Z128

[stefan83]

Hi all,

i try to make a SW reset on the MKW01Z in a simple application derived from the WirelessUart example with a bare metal OS.

The code that i use to reset is simply:

NVIC_SystemReset();

I try even this:

               int index_timer=0;

              MLMEPhySoftReset();

              GPIO_DRV_WritePinOutput(kGpioXcvrReset, 0);

              while(TMR_StopTimer(index_timer)!=gTmrInvalidId_c){index_timer++;};

              OSA_EXT_InterruptDisable();

              NVIC_SystemReset();

But in any case the result is that sometimes HardFault rises up.

Any suggestions?

Best,

Stefano

[jeremyzhou]

Hi Stefano Pieri,

What is going on with the issue now?
Have a great day,
Ping

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[stefan83]

Sorry the while cycle is:

while(1)

    {

      (void)OSA_EventWait(&gTaskEvent, gEventsAll, FALSE, OSA_WAIT_FOREVER ,&gTaskEventFlags);

      if(gUART_RX_EVENT_c == gTaskEventFlags ){         

            if (toggle_led){

                   PrintMenu(cu8FreescaleLogo, mAppSer);

                   toggle_led=FALSE;

            }else{

              toggle_led=TRUE;

              int index_timer=0;

              MLMEPhySoftReset();

              GPIO_DRV_WritePinOutput(kGpioXcvrReset, 0);

              while(TMR_StopTimer(index_timer)!=gTmrInvalidId_c){index_timer++;};

              OSA_EXT_InterruptDisable();

              Boot_Cpu_SystemReset();

            }

      }

[jeremyzhou]

Hi Stefano,

Please refer to the thread below.

https://mcuoneclipse.com/2015/07/01/how-to-reset-an-arm-cortex-m-with-software/
Have a great day,
Ping

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[stefan83]

Hi Ping,

In effect NVIC_SystemReset() makes the instructions:

  __DSB();                                                     /* Ensure all outstanding memory accesses included

                                                                       buffered write are completed before reset */

  SCB->AIRCR  = ((0x5FAUL << SCB_AIRCR_VECTKEY_Pos) |

                 SCB_AIRCR_SYSRESETREQ_Msk);

  __DSB();                                                     /* Ensure completion of memory access */

  while(1) { __NOP(); }   

But in some reboot the program go into the HardFault_Handler when the Application  Restart.

I think that could be caused by the transciever that is not well reset or by a bad Memory management.

I use the bare metal OS and the program is very simple:

void main_task(uint32_t param)

{

  static bool_t bIsInitialized = FALSE;

  static bool_t bUserInteraction = FALSE;

  static bool toggle_led = TRUE;

  if( !bIsInitialized )

  {

    hardware_init();

      CACHE_DISABLE

      NV_Init();

      gFlashConfig.CallBack = (PCALLBACK)RelocateFunction((uint32_t)__ram_for_callback , CALLBACK_SIZE , (uint32_t)callback);

      MCM_BWR_PLACR_DFCC(MCM_BASE_PTR, 1);

    MEM_Init();

    TMR_Init();

    LED_Init();

    //initialize PHY

    Phy_Init();

    //initialize Serial Manager

    SerialManager_Init();

     LED_StartSerialFlash(LED1);   

    OSA_EventCreate(&gTaskEvent, kEventAutoClear);

    Serial_InitInterface( &mAppSer, APP_SERIAL_INTERFACE_TYPE, APP_SERIAL_INTERFACE_INSTANCE);//Get handle of serial interface

    Serial_SetBaudRate (mAppSer, gUARTBaudRate115200_c);   //Set 115200 as default baud

    Serial_SetRxCallBack(mAppSer, UartRxCallBack, NULL);   //Set Receive callback for uart

    InitApp();

    #ifdef VERBOSE

    /*Prints the Welcome screens in the terminal*/ 

    PrintMenu(cu8FreescaleLogo, mAppSer);

    Serial_Print(mAppSer,"\r\n\r\n Press switch1 button to start application\r\n\r\n",gAllowToBlock_d);

     #endif

    bIsInitialized = TRUE;

  }

  bUserInteraction = TRUE;

  if(bUserInteraction)

  {

    while(1)

    {

      (void)OSA_EventWait(&gTaskEvent, gEventsAll, FALSE, OSA_WAIT_FOREVER ,&gTaskEventFlags);

      if(gUART_RX_EVENT_c == gTaskEventFlags ){          

            if (toggle_led){

                   PrintMenu(cu8FreescaleLogo, mAppSer);

                   toggle_led=FALSE;

            }else{

              LED_StartSerialFlash(LED1);

              toggle_led=TRUE; 

             // relocate vector table

             SCB->VTOR = RELOCATED_VECTORS;

             AppIDC = 0;

             // Jump to user application

             JumpToUserApplication(*((unsigned long*)RELOCATED_VECTORS), *((unsigned long*)(RELOCATED_VECTORS+4)));

              int index_timer=0;

              MLMEPhySoftReset();

              GPIO_DRV_WritePinOutput(kGpioXcvrReset, 0);

              while(TMR_StopTimer(index_timer)!=gTmrInvalidId_c){index_timer++;};

              OSA_EXT_InterruptDisable();

              Boot_Cpu_SystemReset();

            }

      }

      if (gUseRtos_c == 0)

      {

        break;

      }

    }

  }

}