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MSP430FR5969: I want to get out of the LMP4 mode without button interupt

Pukhraj Singh
Intellectual 375 points
Part Number: MSP430FR5969
Other Parts Discussed in Thread: MSP430WARE, MSP-EXP430FR5969

Hello TI Team, 

I am using an example code for MSP430FR5969, I want the device to go into LMP4 mode and after 60 seconds I should restart itself automatically without external interupt(Like a button). How can I achieve this

The code I am using is attached down this thread.

/* --COPYRIGHT--,BSD_EX
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 *                       MSP430 CODE EXAMPLE DISCLAIMER
 *
 * MSP430 code examples are self-contained low-level programs that typically
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 * be taken when combining code from several examples to avoid potential side
 * effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
 * for an API functional library-approach to peripheral configuration.
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 * --/COPYRIGHT--*/
//******************************************************************************
//   MSP430FR59xx Demo - Entering and waking up from LPM4.5 via P1.1 interrupt
//                       with SVS disabled
//
//   Description: Download and run the program. LED1 (or P4.6) will remain ON if
//                LPM4.5 is correctly entered. Use a button S2 (or P1.1) on the
//                EXP board to wake the device up from LPM4.5. This will enable
//                the LFXT oscillator and blink the LED2 (on P1.0).
//
//                This demo was tested on MSP-EXP430FR5969 LaunchPad.
//
//           MSP430FR5969
//         ---------------
//     /|\|            XIN|-
//      | |               | 32KHz Crystal
//      --|RST        XOUT|-
//        |               |
//        |           P1.0|---> LED2 (MSP-EXP430FR5969)
//        |           P4.6|---> LED1 (MSP-EXP430FR5969)
//        |               |
//        |           P1.1|<--- S2 push-button (MSP-EXP430FR5969)
//
//   William Goh / Andreas Dannenberg
//   Texas Instruments Inc.
//   June 2014
//   Built with IAR Embedded Workbench V6.10.3 & Code Composer Studio V6.0
//******************************************************************************

#include <msp430.h>

int main(void) {
    WDTCTL = WDTPW | WDTHOLD;               // Stop watchdog timer

    // Configure GPIO
    P1OUT = 0;                              // Pull-up resistor on P1.1
    P1DIR = 0xFF;                           // Set all but P1.1 to output direction

    P2OUT = 0;
    P2DIR = 0xFF;

    P3OUT = 0;
    P3DIR = 0xFF;

    P4OUT = 0;
    P4DIR = 0xFF;

    PJOUT = BIT4;                           // Set PJ.4 / LFXTIN to high
    PJDIR = 0xFFFF;

    // Determine whether we are coming out of an LPMx.5 or a regular RESET.
    if (SYSRSTIV == SYSRSTIV_LPM5WU) {
        PJSEL0 = BIT4;                      // For XT1

        // Clock System Setup
        CSCTL0_H = CSKEY >> 8;              // Unlock CS registers
        CSCTL1 = DCOFSEL_0;                 // Set DCO to 1MHz
        CSCTL2 = SELA__LFXTCLK | SELS__DCOCLK | SELM__DCOCLK;
        CSCTL3 = DIVA__1 | DIVS__1 | DIVM__1; // Set all dividers
        CSCTL4 &= ~LFXTOFF;

        // Configure LED pin for output
        P1DIR |= BIT0;

        // Disable the GPIO power-on default high-impedance mode to activate
        // previously configured port settings. The oscillator should now start...
        PM5CTL0 &= ~LOCKLPM5;

        do {
            CSCTL5 &= ~LFXTOFFG;            // Clear XT1 fault flag
            SFRIFG1 &= ~OFIFG;
        } while (SFRIFG1 & OFIFG);          // Test oscillator fault flag
    }
    else {
        // Configure P1.1 Interrupt
        P1OUT |= BIT1;                      // Pull-up resistor on P1.1
        P1REN |= BIT1;                      // Select pull-up mode for P1.1
        P1DIR = 0xFF ^ BIT1;                // Set all but P1.1 to output direction
        P1IES |= BIT1;                      // P1.1 Hi/Lo edge
        P1IFG = 0;                          // Clear all P1 interrupt flags
        P1IE |= BIT1;                       // P1.1 interrupt enabled

        P4OUT |= BIT6;                      // Turn on P4.6 (LED1) on EXP board
                                            // to indicate we are about to enter
                                            // LPM4.5

        // Disable the GPIO power-on default high-impedance mode to activate
        // previously configured port settings
        PM5CTL0 &= ~LOCKLPM5;


        PMMCTL0_H = PMMPW_H;                // Open PMM Registers for write
        PMMCTL0_L &= ~(SVSHE);              // Disable high-side SVS
        PMMCTL0_L |= PMMREGOFF;             // and set PMMREGOFF
        PMMCTL0_H = 0;                      // Lock PMM Registers

        // Enter LPM4 Note that this operation does not return. The LPM4.5
        // will exit through a RESET event, resulting in a re-start
        // of the code.
        __bis_SR_register(LPM4_bits);

        // Should never get here...
        while (1);
    }

    // Now blink the LED in an endless loop.
    while (1) {
        P1OUT ^= BIT0;                      // P1.0 = toggle
        __delay_cycles(100000);
    }
}
Thank you!
Best regards,
Pukhraj Singh
  • 0
    TI__Mastermind 28945 points

    Hey Pukhraj,

    What do you want to have on during your low power sleep?  The code example you are showing here is for LPM4.5.  In LPM4.5, everything this shutdown and only external wake-up is possible.  

    Will you have an RTC?  There is an LPM3.5 mode, which shutsdown everything but the RTC and then your RTC could wake you every 60 seconds.  It's very slightly higher power and, but I think this is probably the ideal mode for you.  

    Thanks,

    JD

  • 0 in reply to JD Crutchfield
    Intellectual 375 points

    So, can you share me the code for the LMP3.5 node where the device can go into sleep for 60 seconds and then wake up. Like I am able to download the code but the code is configured for 2 second interval. How do I change it so that the microcontroller is off for 60 seconds and then again power ON the GPIO's.

    Thankyou,

    Best regards,

    Pukhraj Singh

  • 0 in reply to Pukhraj Singh
    TI__Mastermind 28945 points

    Hey Pukhraj,

    Yes, as you mentioned, we have a LPM3.5 example that wakes from RTC every 2 seconds, here: https://dev.ti.com/tirex/explore/node?node=A__AAMul1n2VPAevkaO2S7xVw__msp430ware__IOGqZri__LATEST 

    To change from 2 seconds to 60 seconds, the easiest way would probably be to change the divider in InitRTC() and WakeUpLPM35() functions. 

    Thanks,

    JD 

  • 0 in reply to JD Crutchfield
    Intellectual 375 points

    Hello JD,

    I am very new to MSP430. It would be great if you can explain or edit what is needed to be changed in the divider parameter in InitRTC() and WakeUpLPM35() functions.

    Thank you!

    Best regards,

    Pukhraj Singh

  • 0 in reply to Pukhraj Singh
    TI__Mastermind 28945 points

    Pukhraj,

    Unfortunately, I haven't had a chance to dig in and give specific code change recommendations, but perhaps you can look at the RTC MSP Academy and hopefully it will help you out.  It's a written, interactive training.  It's written for a FR2x device, but you can probably follow somewhat closely along on the FR5x. 

    Thanks,

    JD 

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