topic Re: Correct method to reset MKW01Z128 in Kinetis Microcontrollers

Correct method to reset MKW01Z128

stefan83 — Wed, 22 Jun 2016 11:38:37 GMT

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

Re: Correct method to reset MKW01Z128

jeremyzhou — Thu, 23 Jun 2016 02:37:13 GMT

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

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Re: Correct method to reset MKW01Z128

stefan83 — Thu, 23 Jun 2016 07:45:57 GMT

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;

}

Re: Correct method to reset MKW01Z128

stefan83 — Thu, 23 Jun 2016 07:58:55 GMT

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();

}

Re: Correct method to reset MKW01Z128

jeremyzhou — Wed, 21 Sep 2016 01:48:29 GMT

Hi Stefano Pieri,

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