TM4C129ENCPDT: Low Power Consumption in TM4C129ENCPDT controller by keeping TI-RTOS running

Thanks for the response

<-------- Bootloader .cmd file start -------->

#define APP_BASE 0x00000000

#define RAM_BASE 0x20000000

MEMORY

{

    FLASH (RX) : origin = APP_BASE, length = 0x00100000

    SRAM (RWX) : origin = 0x20000000, length = 0x00040000

}

SECTIONS

{

    .intvecs:   > APP_BASE

    .text   :   > FLASH

    .const  :   > FLASH

    .cinit  :   > FLASH

    .pinit  :   > FLASH

    .init_array : > FLASH

    .vtable :   > RAM_BASE

    .data   :   > SRAM

    .bss    :   > SRAM

    .sysmem :   > SRAM

    .stack  :   > SRAM

}

__STACK_TOP = __stack + 1024;

<-------- End -------->

In my previous post, I have mentioned application code .cmd file where APP_BASE address starts from 0x00008000.

As per your suggestion, I have removed .intvecs from application code .cmd file, now it’s error free but I amn’t able to achieve my ultimate goal i.e sleep mode

I am trying to implement sleep mode in our micro-controller by referring example code sleep_modes, where sleep and deep_sleep are available, but I am trying only sleep mode.

For the same, I have created a new task where based on button (Port P, pin 0) press (interrupt), system will switch from run to sleep mode and vice-versa, so here one interrupt is required

Your suggestion isn't to go for IVT, instead use gpio interrupt to achieve sleep mode. Then let me try the same

Please correct me, if I have understood anything wrong

.

Only reason I tried with this because in example code it is implemented using IVT in single thread application

Our objective is to achieve low power consumption, any suggestion if you have feel free to share

Thanks

abhiraj pr said:

I am trying to implement sleep mode in our micro-controller by referring example code sleep_modes, where sleep and deep_sleep are available, but I am trying only sleep mode.

There is no TI-RTOS sleep_modes example for TM4C129.  TI-RTOS does not have any built-in Power management support for Tiva devices as of now. You should be able to use driver lib functions in a TI-RTOS application to put the core to sleep. 

Are you referring to the non-TI-RTOS example C:\ti\TivaWare_C_Series-2.2.0.295\examples\boards\ek-tm4c1294xl\sleep_modes?

If you are trying to adapt the non-TI-RTOS sleep_modes example for TI-RTOS then I will suggest you first try the example as-is and get it to work first. 

abhiraj pr said:

Your suggestion isn't to go for IVT, instead use gpio interrupt to achieve sleep mode.

What is IVT? 

Interrupt Vector Table

Hello,

All previous mentioned attempt(s) are to implement Low Power Consumption in TM4C129ENCPDT by keeping TI-RTOS running,

-> 1st by referring example code of sleep mode (single thread application), but failed because of Interrupt vector table

I wrote Hwi code to generate interrupt, it cause controller restart, may be because of some mismatch between gpio interrupt and ROM API(s) of example code

-> 2nd by making enable, disable and priority reduction to -1 of Task(s), but unfortunately I didn't observe any power consumption difference

###############################################################

My ultimate purpose is, Power consumption of controller in

-> sleep mode should be less than 5mA

-> run mode based on the connected peripheral devices

Sleep Mode

In every periodic interval and based on condition as well, controller has to go for sleep mode

During sleep mode, few peripherals will be in active condition while most of peripheral will be disconnected

Controller wakeup will take place, only in case of external interrupt

External interrupt (Hwi) can occur in two conditions,

-> normal case, as per our process requirement which will be periodic

-> exceptional case, it isn't regular but controller should wakeup to attend interrupt then come back to sleep mode again

Any suggestion w.r.t hardware design or software modification are acceptable considering TM4C129ENCPDT micro-controller and TI-RTOS

I request all community members, voluntarily please help to achieve Low Power Consumption in TI-RTOS

Thanks

abhiraj pr said:

I wrote Hwi code to generate interrupt, it cause controller restart, may be because of some mismatch between gpio interrupt and ROM API(s) of example code

I suspect that the device is awaken due to the timer. As you may have already known, the TI-RTOS or any RTOS relies on a periodic ticks for scheduling. By default the ticks are generated at 1ms period. I tend to think that after you entered sleep mode the timer woke up the processor by generating an interrupt. 

Thanks for your response @Charles

In case program is trying to get into sleep mode, controller is restarting

I don't have any clue how to move ahead

So can you please help how to achieve Low Power Consumption in TM4C129ENCPDT by keeping TI-RTOS running

At least I would like to know whether it is possible or not to achieve the same

Awaiting for your response

Hi,

 As I mentioned before, TI-RTOS does not have any built-in Power management (e.g. TI-RTOS drivers) support for Tiva devices.  You might want to try disabling all interrupts except the GPIO port that you plan to use for wakeup before you enter sleep mode.  First see if that will prevent the processor from waking up. Once the GPIO has woken up the device, you can reenable the rest of interrupts (e.g. timer interrupts for BIOS). 

Hi,

  Thanks for the tips. I'm sure it will benefit the community who is looking for the same solution.