RTOS/MSP432P401R: Wakeup from GPIO is not working

Kevin Prior

Part Number: MSP432P401R

Tool/software: TI-RTOS

Hello,

I want to shutdown the controller in the lowest power state (LPM4.5). Therefore I'm using the function:

Power_shutdown(PowerMSP432_SHUTDOWN_1, 0);

This function seems to work. But i can't wake up the controller with a GPIO interrupt. I have configured four buttons as interrupt inputs:

GPIO_PinConfig gpioPinConfigs[] = {
    /* Input pins */
    /*
     * NOTE: Specifying FALLING edge triggering for these buttons to ensure the
     * interrupts are signaled immediately.  See the description of the
     * PowerMSP432 driver's automatic pin parking feature for this rationale.
     */

    /* Buttons */
    GPIOMSP432_P4_0 | GPIO_CFG_IN_PU   | GPIO_CFG_IN_INT_FALLING,
    GPIOMSP432_P4_2 | GPIO_CFG_IN_PU   | GPIO_CFG_IN_INT_FALLING,
    GPIOMSP432_P4_1 | GPIO_CFG_IN_PU   | GPIO_CFG_IN_INT_FALLING,
    GPIOMSP432_P4_5 | GPIO_CFG_IN_PU   | GPIO_CFG_IN_INT_FALLING,
}

    GPIO_setCallback(BUTTON_1, buttonCallback);
    GPIO_setCallback(BUTTON_2, buttonCallback);
    GPIO_setCallback(BUTTON_3, buttonCallback);
    GPIO_setCallback(BUTTON_4, buttonCallback);

    GPIO_enableInt(BUTTON_1);
    GPIO_enableInt(BUTTON_2);
    GPIO_enableInt(BUTTON_3);
    GPIO_enableInt(BUTTON_4);

I'm also using the CC1310 controller. There the shutdown and wakeup is working with the following code:

PINCC26XX_setWakeup(SPI_CSN_WakeUpTable);

/* Wake-up  pin table */
PIN_Config SPI_CSN_WakeUpTable[] =
{
    CC1310_LAUNCHXL_SPI0_CSN | PIN_INPUT_EN | PIN_PULLUP | PINCC26XX_WAKEUP_NEGEDGE,
    PIN_TERMINATE                                 /* Terminate list */
};

Is there something similar for the MSP432 available?

Thank you for your help & efforts

Kevin

over 8 years ago

0 William Goh over 8 years ago

TI__Genius 16205 points

Kevin,

We may have to investigate this a little bit on our end and get back to you on this. One quick question here, do you have this function defined in your application?

    /* Register for entering shutdown notifications */
    Power_registerNotify(&notifyObj, PowerMSP432_ENTERING_SHUTDOWN, (Power_NotifyFxn) notifyFxn, 0);

One other thing that you could also try is to see if your board can wake-up from LPM4.5 through the buttons using a low-level code example to eliminate any hardware.

Navigate to the SimpleLink SDK folder <SimpleLinkFolder>\examples\nortos\MSP_EXP432P401R\registerLevel\msp432p401x_pcm_11

And there is the msp432p401x_pcm_11.c example that enters LPM4.5 with a wake-up from GPIO pin.

William

0 Kevin Prior over 8 years ago in reply to William Goh

Prodigy 70 points

Hello William,

thank you for your answer.
I have already registered and defined that function in my application.
Furthermore I have tried to clear the interrupt flags before shutting down the uC and have checked the registers directly before shutdown(interrupt flags cleared and enabled).

The example pcm_lpm35_rtc_wakeup.c is not working. When the minute has passed the isr RTC_C_IRQHandler is called. Instead of a reset the controller continues after the PCM_shutdownDevice(PCM_LPM35_VCORE0); function, leaves the main and therefore crashes.

Thanks for the advice to look at the msp432p401x_pcm_11.c example. I just have tested the example and it works fine.

Kevin

0 John P. Morrison over 8 years ago in reply to Kevin Prior

TI__Intellectual 2405 points

Kevin,

I found the following example code for TI-RTOS LPM4.5 (power shutdown). Note, this example is not intended to wakeup from GPIO so it must be modified some to work that way.

http://dev.ti.com/tirex/#/?link=Software%2FSimpleLink%20MSP432%20SDK%2FExamples%2FDevelopment%20Tools%2FMSP-EXP432P401R%20-%20Rev%202.x%20(Red)%2FTI%20Drivers%2Fpowershutdown%2FTI-RTOS%2FCCS%20Compiler%2Fpowershutdown

The modifications that I have found to work are the following:

1. Change the GPIO_wwrite() function to a GPIO_toggle() function so that you can see this working. (Can't use debugger in LPM4.5)
2. Change the notify function so that P1.1 is not set to outputPin. (I used (PIN_ALL16 &(~GPIO_PIN1)) as the 2nd parameter for lines 94 & 100 which are the PORT_PA lines.
3. Include this register level command in your main_tirtos.c file right before Board_initGeneral(). PCM->CTL1 = PCM_CTL1_KEY_VAL;

This is working for me so that the LED will toggle each time I press S1; please let me know if it works for you also.

EDIT:

Just for future users' reference:

NOTE: I went back and looked at this again today, and realized I missed a step to explain this properly. You should also add these header files to maintirtos.c

/* Driverlib Header files */

#include <ti/devices/msp432p4xx/driverlib/driverlib.h>

0 Kevin Prior over 8 years ago in reply to John P. Morrison

Prodigy 70 points

Hello John,

Thank you very much for your help!

It's working now in my project! The register level command PCM->CTL1 = PCM_CTL1_KEY_VAL before the Board_initGeneral() was the solution.

I have tried this register command before, but I added this command after the Board_initGeneral(). This worked unfortunately only for one shutdown and wakeup.

Thanks for the very fast support & kind regards

Kevin

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RTOS/MSP432P401R: Wakeup from GPIO is not working