MSPM0G3519: MSPM0G3519 - Low Power mode Implementation with GPIO wake up

Sakhan

Part Number: MSPM0G3519

Hi,

I am working on MSPM0G3519 Low power mode implementation with GPIO wake up. I took the TIMER ISR example code and added the GPIO with enabled wake up feature.

#include "ti_msp_dl_config.h"

uint32_t switchInput =0;

int main(void)
{
    SYSCFG_DL_init();

    // NVIC_EnableIRQ(TIMER_0_INST_INT_IRQN);
    /* Calling WFI after calling DL_SYSCTL_enableSleepOnExit will result in
     * only ISR code to be executed. This is done to showcase the device's
     * low power consumption when sleeping.
     */
        DL_SYSCTL_setPowerPolicySTOP0();


    while (1) {

        DL_GPIO_togglePins(GPIO_LEDS_PORT,
                           GPIO_LEDS_USER_LED_1_PIN);

        /*
         * Enter STOP0
         */
        // __WFI();

        switchInput =
            DL_GPIO_readPins(GPIO_SWITCH_PORT,
                             GPIO_SWITCH_FastWakeup_PA12_PIN);

        delay_cycles(6000000);

        DL_GPIO_togglePins(GPIO_LEDS_PORT,
                           GPIO_LEDS_USER_LED_2_PIN);
    }
}

Please guide me to implement the GPIO wake up from Low Power mode.

Regards,

SaKhan

3 months ago

0 JD Crutchfield 3 months ago

TI__Mastermind 30560 points

Hey Sakhan,

First, you only need the "Wake" feature when you are using Shutdown mode. In this ultra-low power mode, everything is shut down except for a few pins which are configured for waking the MCU. For that, you have configured the pin correctly but waking from Shutdown mode will actually trigger a reset - would would start back at the top of your code.

In the above code, you are only going to STOP0 so you can use any pin, but instead of waking up the pin would trigger an interrupt. And returning from the interrupt, the device can be configured to run the rest of the code. Instead of configuring the pin for wake, you just need to enable an interrupt on the pin.

If you actually only need Stop or Standby mode, you can use this example to configure GPIO interrupts: https://dev.ti.com/tirex/explore/node?isTheia=false&node=A__AMEOxFB39VF.HUKTWpXCBw__MSPM0-SDK__a3PaaoK__LATEST

If you actually need to go all the way down to Shutdown, you will also need to also handle reset causes. Look at this example: https://dev.ti.com/tirex/explore/node?isTheia=false&node=A__AGIo1SxTurT2e9rEDNPs9A__MSPM0-SDK__a3PaaoK__LATEST

Thanks

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MSPM0G3519: MSPM0G3519 - Low Power mode Implementation with GPIO wake up