how to wakeup a micro controller from sleep mode

Hello John,

Are you enabling the clocks in Sleep Mode to the wakeup source? A code would be useful

Regards
Amit

yes we have enabled the clocks in sleep mode using SysCtlPeripheralClockGating(true).

we have two scenarios now.

1)we are calling SysCtlSleep() inside ISR of External Pulse Interrupt,in that case controller(LM4F232H5QD) is going into sleep and we are unable to wake up the controller.we are getting External interrupts continuously still we are unable to wake up the controller.

2)we are calling SysCtlSleep() in main(),in that case controller is not going into sleep mode.(This we are able to observe because it is executing pre and post statements of sleep call).

Please let us know what is wrong with the above approaches.

Hello John,

The Sleep and Deep Sleep features do not work when the debugger is connected as it is an inhibitor. This is mentioned in the Data Sheet as well. I would advise disconnecting the debugger and then running the code.

Regards
Amit

Dear Amit,

we have not connected any external debugger.we are just using micro-controller ,sensor and as you can see from the above post CCS. apart from that we don't have any thing extra connected to our set-up.
from the above two approaches which one you suggest us to proceed with?
could you please go through the above code snippets and let us know guide further on this

Thanks and Regards
johnkrishna

Hello John,

The CCS is connected, isn't it? The CCS is the IDE and the Stellaris ICDI is the debugger. I would suggest approach#2

Regards
Amit

Dear Amit,

  As you have suggested we are following approach 2 only.yes CCS was connected earlier.Now we have disconnected Stellaris ICDI and we are not connected to CCS IDE also.we have flashed the code and running independent of the debugger,even then we are unable to put micro-controller to sleep.

what could be the problem?looking forward for your quick response.

Thanks and Regards

John Krishna

Hello John,

How are you ascertaining that the device is in Sleep State?

Regards
Amit

Hello Amit,

  The module is not going into sleep mode.i am ascertaining this because the program is executing the statements before and after the sleep() method call even when i didn't enable USB and UART in sleep mode.

//SysCtlPeripheralSleepEnable(SYSCTL_PERIPH_UART0);

//SysCtlPeripheralSleepEnable(SYSCTL_PERIPH_USB0);

Hello John,

Is the SysTick timer enabled? It could be the possible source of the wakeup. If you disable the SysTick timer that should be information whether the source of wakeup is in the CPU sub system or not.

Regards
Amit

Hello Amit,

         As you have suggested to go for approach 2 as mentioned earlier.By using approach 2 we are not able to put micro-controller in sleep mode only.So please suggest us first how to put micro-controller to sleep mode .

Regards

JohnKrishna

Hello John,

Did you check about the SysTick timer?

Regards
Amit