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ckuecker

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2008/06/25 15:08

LM3S6965 crashes in hibernate

While poking around in the hibernate module, using the driver lib code supplied with the LM3S6965 Ethernet Eval Board, I find the code hitting the FaultISR exception when I attempt to save processor state using HibernateDataSet(). The culprit is the line below:

Code:

 
        //
        // Add a delay between writes to the data area.
        //
        if(CLASS_IS_FURY)
        {
            //
            // Delay a fixed time on Fury-class devices
            //
>>> Dies here>   SysCtlDelay(g_ulWriteDelay);
        }



The actual assembly code that hits the exception is shown below in the disassembly:

if(CLASS_IS_FURY)
00002B7C 4808 LDR R0, [PC, #0x20]

so it necer gets to the delay routine.

I am using the setup code that came with the enet_lwip example project.

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cb1

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2008/06/25 15:48

Re:LM3S6965 crashes in hibernate

Don't have any hibernate-capable devices yet so can't replicate your findings.

Always prefer simplicity - could you load in the basic "blinky" program - without the added complexity of ethernet & other functions? Believe that you need to perform a fuller examination of "hibernate" - perhaps smaller/simpler codes with few "hooks" will speed/ease your investigation.

Good luck - keep posting.

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ckuecker

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2008/06/25 16:08

Re:LM3S6965 crashes in hibernate

OK. Tried Blinky - it runs rine as it was.

Added the hibernate setup, as I had it - had to add hibernate.c and sysctl.c:

Code:

 
#include "../../../inc/lm3s6965.h"
#include "../../../hw_types.h"
#include "../../../src/sysctl.h"
#include "../../../src/hibernate.h"

int main(void)
{
    volatile unsigned long ulLoop;

    //
    // Enable the GPIO port that is used for the on-board LED.
    //
    SYSCTL_RCGC2_R = SYSCTL_RCGC2_GPIOF;

    //
    // Do a dummy read to insert a few cycles after enabling the peripheral.
    //
    ulLoop = SYSCTL_RCGC2_R;

    //
    // Enable the GPIO pin for the LED (PF0).  Set the direction as output, and
    // enable the GPIO pin for digital function.
    //
    GPIO_PORTF_DIR_R = 0x01;
    GPIO_PORTF_DEN_R = 0x01;

>> dies here>>    HibernateClockSelect(HIBERNATE_CLOCK_SEL_RAW); // Set up hibernation module for 32 kHz input
    HibernateEnableExpClk(SysCtlClockGet());
    HibernateRTCEnable();
    HibernateWakeSet(HIBERNATE_WAKE_RTC);
    HibernateRTCMatch0Set(512);

    //
    // Loop forever.
    //
    while(1)
    {
        //
        // Turn on the LED.
        //
        GPIO_PORTF_DATA_R |= 0x01;

        //
        // Delay for a bit.
        //
        for(ulLoop = 0; ulLoop < 200000; ulLoop++)
        {
        }

        //
        // Turn off the LED.
        //
        GPIO_PORTF_DATA_R &= ~(0x01);

        //
        // Delay for a bit.
        //
        for(ulLoop = 0; ulLoop < 200000; ulLoop++)
        {
        }
    }
}



Now, it dies just as my original code did.

Could this just be a bad crystal on the hibernate module? I don't like the waveforms I see there...

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cb1

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2008/06/25 19:25

Re:LM3S6965 crashes in hibernate

Check that you have done everything to enable hibernate osc/clock - seems as if you may not be oscillating. You should be able to probe XOsc (out) with a Hi-Z scope probe and see 4.19MHz.

I will read the hibernate chapter again looking for details...

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cb1

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2008/06/25 20:50

Re:LM3S6965 crashes in hibernate

Got it!

HIBERNATE_CLOCK_SEL_DIV128 is what you need.
(get rid of the CLOCK_SEL_RAW - that is for the external OSC in)

Thus you never enabled the 4.194MHZ xtal - which is what we reasoned.

This hibernate module is very valuable, powerful - brings LMI into the battery powered arena.

Be sure you have power to HIB and BAT pins.

*** If this doesn't work instantly I may have found an error in hibernate.h.

#define HIBERNATE_CLOCK_SEL_RAW 0x04
#define HIBERNATE_CLOCK_SEL_DIV128 0x00

My read of the DataSheet shows these to be 0x44 and 0x40 (your case - w/ xtal).
Bit 7 enables your xtal. Let us know please...

Post edited by: cb1, at: 2008/06/25 20:57

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ckuecker

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2008/06/26 10:22

Re:LM3S6965 crashes in hibernate

All right -I have changed the code to HibernateClockSelect(HIBERNATE_CLOCK_SEL_DIV128);

It still dies at the first call to this function, precisely, it dies at assembly code:

?Subroutine0:
> dies here 00000278 680A LDR R2, [R1]
0000027A 439A BICS R2, R2, R3
0000027C 4302 ORRS R2, R2, R0
0000027E 600A STR R2, [R1]

I see nothing on the 4.194304 MHz cryastal, at either lead. I am using the ethernet eval board, so all power and other signals are there - I hope!

Here's a hint, possibly - when I first powered the eval board up, before I started the IAR IDE, the Blinky program loaded last night started right up and ran - and I saw about a 112 kHz sawtooth on the crystal leads. This was with HibernateClockSelect still using HIBERNATE_CLOCK_SEL_RAW.

I just reset the program in the debugger, exited, and power cycled the eval board. Blinky appears to be running, and I see a 63 Hz negative going pulse train - 600 uSec negative pulses - on the crystal at header pin 56, which is XOSC1 - pin 53 on the processor.

Is the LED blinking because the processor is repeatedly resetting?

I have 32 kHz oscillator units on order - when I get them, I will try again with HIBERNATE_CLOCK_SEL_RAW.

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