K20DX Reset

alvaropatacchio — Thu, 29 Aug 2013 14:49:03 GMT

Hello everyone,

I am using for the first time a K20DX 128VLH5, the Init hardware sequence should be:

- watchdog unlocking

- external oscillator with PLL at 50Mhz enabling

- low voltage detect high mode enabling

Everything seems fine but when there are repetitive short interruptions on main voltage, the built in oscillator hangs and my board stop indefinitely. Is out there someone else with my same problem?

Attached you’ll find hang sequence as seen on my oscilloscope. (A curve is external oscillator, B curve is processor reset pin)

Kind regards

Alvaro

Re: K20DX Reset

santiago_lopez — Thu, 29 Aug 2013 17:09:36 GMT

Hi Alvaro,

It seems like the MCU is soft-restarting for some reason, maybe something with the code. Did you try debugging your code to see in which specific part of it the MCU is restarting or hanging? It would be great if you could share your source code with us.

Saludos

Re: K20DX Reset

rogerfl — Thu, 29 Aug 2013 22:50:54 GMT

This sounds similar to a problem I had. I had probably fried my board playing with 12V power. It would run just fine in reset default slow clock, but when it tried to start using the external oscillator and PLL at 50 MHz it just died instead. I chunked it, got a new one, and hope to be more careful the next time I start wiring the 12V peripherals.

Roger

Re: K20DX Reset

alvaropatacchio — Fri, 30 Aug 2013 08:49:23 GMT

Hello Santiago,

during the short interruptions on main voltage the MCU
restart correctly, but after 5-10 click the system will be stopped for ever. To
restart it I shut down the supply or give a manual reset on the pin.

It’s impossible to give short interruptions on main
voltage in debug mode.

void __init_hardware(void)
{

/*** !!! Here you can place your own code before PE initialization using property "User code before PE initialization" on the build options tab. !!! ***/

/*** ### MK20DX128VLH5 "Cpu" init code ... ***/
/*** PE initialization code after reset ***/
SCB_VTOR = (uint32_t)(&__vect_table); /* Set the interrupt vector table position */
/* Disable the WDOG module */
/* WDOG_UNLOCK: WDOGUNLOCK=0xC520 */
WDOG_UNLOCK = WDOG_UNLOCK_WDOGUNLOCK(0xC520); /* Key 1 */
/* WDOG_UNLOCK: WDOGUNLOCK=0xD928 */
WDOG_UNLOCK = WDOG_UNLOCK_WDOGUNLOCK(0xD928); /* Key 2 */
/* WDOG_STCTRLH: ??=0,DISTESTWDOG=0,BYTESEL=0,TESTSEL=0,TESTWDOG=0,??=0,??=1,WAITEN=1,STOPEN=1,DBGEN=0,ALLOWUPDATE=1,WINEN=0,IRQRSTEN=0,CLKSRC=1,WDOGEN=0 */
WDOG_STCTRLH = WDOG_STCTRLH_WAITEN_MASK |
                 WDOG_STCTRLH_STOPEN_MASK |
                 WDOG_STCTRLH_ALLOWUPDATE_MASK |
                 WDOG_STCTRLH_CLKSRC_MASK |
                 0x0100U;
/* System clock initialization */
/* SIM_SCGC5: PORTE=1,PORTD=1,PORTC=1,PORTB=1,PORTA=1 */
SIM_SCGC5 |= SIM_SCGC5_PORTE_MASK |
               SIM_SCGC5_PORTD_MASK |
               SIM_SCGC5_PORTC_MASK |
               SIM_SCGC5_PORTB_MASK |
               SIM_SCGC5_PORTA_MASK;   /* Enable clock gate for ports to enable pin routing */
/* SIM_SCGC5: LPTIMER=1 */
SIM_SCGC5 |= SIM_SCGC5_LPTIMER_MASK;
if ( *((uint8_t*) 0x03FFU) != 0xFFU) {
    MCG_C3 = *((uint8_t*) 0x03FFU);
    MCG_C4 = (MCG_C4 & 0xFEU) | ((*((uint8_t*) 0x03FEU)) & 0x01U);
}
/* SIM_CLKDIV1: OUTDIV1=0,OUTDIV2=0,??=0,??=0,??=0,??=0,OUTDIV4=1,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0 */
SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV4(0x01); /* Update system prescalers */
/* SIM_SOPT2: PLLFLLSEL=0 */
SIM_SOPT2 &= (uint32_t)~(uint32_t)(SIM_SOPT2_PLLFLLSEL_MASK); /* Select FLL as a clock source for various peripherals */
/* SIM_SOPT1: OSC32KSEL=0 */
SIM_SOPT1 &= (uint32_t)~(uint32_t)(SIM_SOPT1_OSC32KSEL(0x03)); /* System oscillator drives 32 kHz clock for various peripherals */
/* Switch to FEI Mode */
/* MCG_C1: CLKS=0,FRDIV=0,IREFS=1,IRCLKEN=1,IREFSTEN=0 */
MCG_C1 = (MCG_C1_IREFS_MASK | MCG_C1_IRCLKEN_MASK);
/* MCG_C2: LOCRE0=0,??=0,RANGE0=0,HGO0=0,EREFS0=0,LP=0,IRCS=0 */
MCG_C2 = 0x00U;
/* MCG_C4: DMX32=1,DRST_DRS=1 */
MCG_C4 = (uint8_t)((MCG_C4 & (uint8_t)~(uint8_t)(
            MCG_C4_DRST_DRS(0x02)
           )) | (uint8_t)(
            MCG_C4_DMX32_MASK |
            MCG_C4_DRST_DRS(0x01)
           ));
/* OSC0_CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
OSC0_CR = OSC_CR_ERCLKEN_MASK;
/* MCG_C7: OSCSEL=0 */
MCG_C7 &= (uint8_t)~(uint8_t)(MCG_C7_OSCSEL_MASK);
/* MCG_C5: ??=0,PLLCLKEN0=0,PLLSTEN0=0,PRDIV0=0 */
MCG_C5 = 0x00U;
/* MCG_C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0 */
MCG_C6 = 0x00U;
while((MCG_S & MCG_S_IREFST_MASK) == 0x00U) { /* Check that the source of the FLL reference clock is the internal reference clock. */
}
while((MCG_S & 0x0CU) != 0x00U) {    /* Wait until output of the FLL is selected */
}
/*** End of PE initialization code after reset ***/

/*** !!! Here you can place your own code after PE initialization using property "User code after PE initialization" on the build options tab. !!! ***/

}

Regards, Alvaro

Kinetis MicrocontrollersのトピックRe: K20DX Reset

K20DX Reset

Re: K20DX Reset

Re: K20DX Reset

Re: K20DX Reset