Kinetis MicrocontrollersのトピックCan't enable Watchdog

Can't enable Watchdog

mattiaberton — Thu, 05 May 2016 13:11:58 GMT

Hello,

I'm using a Kinetis KM33Z128A5 serie Microcontroller, Codewarrior 10.6 and Baremetal drivers.

However, I can't enable in proper way the watchdog.

I just copied the example, in the baremetal drivers:

	/* enable clocks to all on chip peripherals	*/
	SIM_Init (SIM_MODULE_ALL_PERIPH_ON_CONFIG);

	// Watchdog Init
	/* Watchdog timeout is of 1.5 sec approximately	*/
	WDOG_Init(WDOG_MODULE_NORMAL_STOP_DI_DBG_DI_CONFIG(WDOG_LPO_CLK,WDOG_DIV1,1500));

But the watchdog doesn't start, neither in debug mode, nor in normal mode. I can see that it is working only if I put a breakpoint on the WDOG_Init instruction, when I see that the successive instruction is a reset.

I tried to watch the register, and what I see is that the WDOG_STCTRLH is kept at the value of 0x0152 no matter what I put in the WDOG_Init arguments. Also, after the reset this value is 0x0153.

Any ideas?

Re: Can't enable Watchdog

jeremyzhou — Fri, 06 May 2016 03:18:33 GMT

Hi Mattia,

I'd highly recommend that you can refer to the WDOG driver demo which be included in the KSDK 1.3 and the demo is reside in ~\KSDK_1.3.0\examples\twrkm34z75m\driver_examples\wdog\iar.Please go to download the KSDK 1.3 through the link as below.

用于Kinetis MCU的软件开发套件|恩智浦

Hope it helps.
Have a great day,
Ping

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Re: Can't enable Watchdog

bobpaddock — Fri, 06 May 2016 12:32:49 GMT

The watchdog register COP is a Write-Once register.

Check in the early startup files to see if it is being disabled there.

Sadly almost all startup's I've looked at do this. :-(

See how I handle this in my vectors.c below.

Until watchdog_init() is defined in some other file the watchdog will be disabled.
When I'm ready to turn the watchdog on I add a watchdog.c/.h that does The Right Stuff in watchdog_init().

In vectors.c (the first file run, gcc compiler):

void watchdog_init( void ) __attribute__ ((weak, alias("watchdog_turn_off")));

static void watchdog_turn_off( void ); /* The watchdog register may only be written to a single time after reset. Default to turning it off */

static void watchdog_turn_off( void ) /* Make sure to override this in a real shipping product. Also account for Bootloader, in MKL43/MKL27 etc, turned it off so need to from Flash */

{

SIM_COPC = 0U; /* Disable the watchdog timer */

}

void _reset_init(void)

{

irq_disable(); /* Did bootloader leave IRQs on perhaps? */

SCB_VTOR = (uint32_t) interrupt_vector_table;

sync_barrier_data();

* The watchdog and power mode registers may only be written to a single time after

* reset. Default to turning it off. Override these function in a

* shipping product if needed:

watchdog_init();

...
}