MQX Software Solutions中的主题 Re: MQX hangs in _esdhc_status_wait

MQX hangs in _esdhc_status_wait

Fabi — Tue, 16 Sep 2014 15:05:16 GMT

Hello,

From time to time I noticed, that MQX blocks in the following loop:

static uint_32 _esdhc_status_wait

(

/* [IN] Module registry pointer */

SDHC_MemMapPtr esdhc_ptr,

/* [IN] Mask of IRQSTAT bits to wait for */

uint_32 mask

)

{

uint_32 result;

{

result = esdhc_ptr->IRQSTAT & mask;

}

while (0 == result);

Because IQRSTAT == 0 and mask == 2. The problem is, tha all tasks are stopped and no external diagnostic is possible if this comes up.

Is it a SD card or a MQX issue? Any ideas?

Re: MQX hangs in _esdhc_status_wait

matthewkendall — Tue, 16 Sep 2014 16:48:22 GMT

I too have seen it hang on that line when there is a hardware error on the bus (we suspect an EMI-caused glitch). If you look carefully at the eSDHC code you will be horrified at the number of such infinite loops with no timeout or other error recovery mechanism.

Re: MQX hangs in _esdhc_status_wait

soledad — Thu, 02 Oct 2014 17:22:04 GMT

Hi F. Bilz,

Did you test the sdcard example? This is located at the path: Freescale_MQX_4_1/mfs/examples/

Regards

Sol

Re: MQX hangs in _esdhc_status_wait

Fabi — Tue, 18 Nov 2014 13:18:32 GMT

We have activated the HW watchdog as work around. Here's the code snipped:

void init_hw_wdt ( void )

{

_int_disable();

// Write sequence within 20 clock cycles to unlock register

WDOG_UNLOCK = 0xC520;

WDOG_UNLOCK = 0xD928;

WDOG_TOVALH = 1000; // about 7 seconds

WDOG_STCTRLH |= WDOG_STCTRLH_WDOGEN_MASK;

WDOG_REFRESH = 0xA602;

WDOG_REFRESH = 0xB480;

_int_enable();

}

void hw_wdt_reset ( void )

{

_int_disable();

WDOG_REFRESH = 0xA602;

WDOG_REFRESH = 0xB480;

_int_enable();

}

@freescale: Could you integrate controller specific code for the hardware watchdog into future MQX releases?

Re: MQX hangs in _esdhc_status_wait

matthewkendall — Tue, 18 Nov 2014 17:31:06 GMT

Not sure what processor you are on but you will likely find there is a Processor Expert driver for the watchdog that integrates with MQX. On a K60 we are using the Processor Expert WatchDog_LDD driver for the EWM peripheral.