Hibernation

Mohsin Mahmud

Hi,

I want to use hibernation mode on my system. I am using the Tiva launchpad to test the hibernation mode. I want the board to go to hibernation mode when button is pressed on launchpad and should wake up when button is pressed again. Kindly advise me on this. I have attached my code.

Regards,

Mohsin

#include <stdint.h>
#include <stdbool.h>
#include "utils/ustdlib.h"
#include "inc/hw_types.h"
#include "inc/hw_memmap.h"
#include "inc/hw_ints.h"
#include "driverlib/sysctl.h"
#include "driverlib/pin_map.h"
#include "driverlib/debug.h"
#include "driverlib/hibernate.h"
#include "driverlib/gpio.h"
#include "driverlib/interrupt.h"

bool g_bHibernate = false;

void HibernateIntHandler(void)
{
uint32_t ui32Status;

//
// Read and clear any status bits that might have been set since
// last clearing them.
//
ui32Status = HibernateIntStatus(0);
HibernateIntClear(ui32Status);

//
// If switch is pressed.
//
if(ui32Status & HIBERNATE_INT_PIN_WAKE)
g_bHibernate = g_bHibernate ? false: true;
}

int main(void)
{
SysCtlClockSet(SYSCTL_SYSDIV_5|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|SYSCTL_OSC_MAIN);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3);
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3, GPIO_PIN_1);

SysCtlPeripheralEnable(SYSCTL_PERIPH_HIBERNATE);
HibernateEnableExpClk(SysCtlClockGet());
HibernateGPIORetentionEnable();
SysCtlDelay(64000000);
HibernateWakeSet(HIBERNATE_WAKE_PIN);

HibernateIntRegister(HibernateIntHandler);
HibernateIntEnable(HIBERNATE_INT_PIN_WAKE);
HibernateIntClear(HIBERNATE_INT_PIN_WAKE);
IntEnable(INT_HIBERNATE);
IntMasterEnable();

while(1)
{
if (g_bHibernate)
{
GPIOPinWrite(GPIO_PORTF_BASE,GPIO_PIN_1, 0x00);
g_bHibernate = false;
HibernateIntClear(HIBERNATE_INT_PIN_WAKE);

//
// Configure Hibernate wake sources.
//
HibernateWakeSet(HIBERNATE_WAKE_PIN);

//
// Enables GPIO retention after wake from hibernation
//
HibernateGPIORetentionEnable();
HibernateRequest();
}
}
}

over 10 years ago

0 Amit Ashara over 10 years ago

TI__Guru**** 244400 points

Hello Mohsin

There are 2 important things on the TM4C123 Launchpad to note for Hibernate mode

1. VDD3OFF mode is not possible. Your code may be configuring it for the same
2. The WAKEn pin which is required for wakeup is not connected to a switch and a GPIO wakeup is not possible

How are you planning to take care of #2?

Regards
Amit

0 Mohsin Mahmud over 10 years ago in reply to Amit Ashara

Intellectual 610 points

Hi Amit,
Thanks for your reply. From my understanding, when switch is asserted, it will asserted the WAKE UP pin so that wake up interrupt can be generated and hence I can put the device in hibernation mode. Sorry I don't understand #2 as if I let the board go into hibernation mode, board can be woken up by pressing the switch on launchpad.
What I want is to setup the WAKE up interrupt as It can generate interrupts in Run, Sleep and Deep Sleep Mode. So tapping on the switch put device in sleep mode and tapping it again brings it out.

Regards,
Mohsin

0 Amit Ashara over 10 years ago in reply to Mohsin Mahmud

TI__Guru**** 244400 points

Hello Mohsin,

Is this the TM4C123 LaunchPad, you are referring to. If yes, then which switch is connected to the WAKE_n pin?

Regards
Amit

0 Mohsin Mahmud over 10 years ago in reply to Amit Ashara

Intellectual 610 points

Hi Amit,
Yes I'm referring TM4C123 LaunchPad. User switch (SW2) is connected to the WAKE pin on the microcontroller.
Regards,
Mohsin

0 Amit Ashara over 10 years ago in reply to Mohsin Mahmud

TI__Guru**** 244400 points

Hello Mohsin,

Yes, you are right about the SW2. So in Hibernate Mode you need to make sure that the VDD3ON bit is set. The simplest thing to check is to replace HibernateRequest with a while(1) and check that the settings for the HIBCTL and HIBIM are correctly done.

Also note that GPIO Retention is not a controllable feature in TM4C123

Regards
Amit

0 Mohsin Mahmud over 10 years ago in reply to Amit Ashara

Intellectual 610 points

Hi Amit,
Kindly could you please tell me how to check the settings for the HIBCTL and HIBIM. Kindly could you please send some code for it. And also how I need to check VDD3ON bit is set. Thanks
Regards,
Mohsin

0 Amit Ashara over 10 years ago in reply to Mohsin Mahmud

TI__Guru**** 244400 points

Hello Mohsin,

Your code looks fine to me. First replace the HibernateRequest with the while(1) loop and then use the CCS debugger to view the hibernate register. Compare it to the data sheet description.

Regards
Amit

0 Mohsin Mahmud over 10 years ago in reply to Amit Ashara

Intellectual 610 points

Hi Amit,

Like you said, I replaced HibernateRequest with while(1). I then put the break point on IntMasterEnable in code and then check the registers, Its looks OK to me. See below

The problem is that I'm getting interrupt when I push SW2 (switch) on launchpad so that it sets g_bHibernate flag and hence board can go into hibernation. Kindly could you please help me on that. Thanks

Regards,

Mohsin

0 Amit Ashara over 10 years ago in reply to Mohsin Mahmud

TI__Guru**** 244400 points

Hello Mohsin,

Isn't that is the expectation. That the switch is pressed to enable the hibernate entry?

Regards
Amit

0 Mohsin Mahmud over 10 years ago in reply to Amit Ashara

Intellectual 610 points

Hi Amit,
I want to use same switch to enter and exit the hibernation.
Regards,
Mohsin

0 Amit Ashara over 10 years ago in reply to Mohsin Mahmud

TI__Guru**** 244400 points

Hello Mohsin,

The WAKE pin can only detect exit from hibernation. To go into hibernation you would need to use the GPIO associated with the SW2 to set the flag using a GPIO Interrupt Handler.

Regards
Amit

0 Mohsin Mahmud over 10 years ago in reply to Mohsin Mahmud

Intellectual 610 points

Hi Amit,
Then why in the datasheet, it says that
"The WAKE pin can generate interrupts in Run, Sleep and Deep Sleep Mode. "
Can you explain me about this? Thanks
Regards,
Mohsin

0 Amit Ashara over 10 years ago in reply to Mohsin Mahmud

TI__Guru**** 244400 points

Hello Mohsin

I think that is not correct. I tried it on my LaunchPad and I get the same results as you. I would need to check the source of the data sheet to see why the text was placed and also check the design.

Regards
Amit

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Hibernation