RTC only can not wake up by RTC alarm

Hi,

Team will work on this and will provide an update on the same.

Thanks & regards,

Sivaraj K

Great that you have read the wiki page. Attached is a modified version of wiki file for alarm. It is a reference and have not been confirmed on HW. Please share your code afterward.

As for the >30.5us requirement, it is for external WAKEUP input only.

7888.wakeup_abb.c.rtf

Regards.

Hello Steve

Thanks for your help.  Now, the wakeup from RTC Alarm can work well according to your document.

1: From the program behavior,  I found the system will restart completly after wakeup,  right or wrong?

2: And another question is where the DSP instruction will stop after power BG_PD and LDO_PD is setted by 1.

For example,  after WU_DIR input & LDO & BG shutdown,  the remaining instructions can not be excutted.

Is it right?

asm(" *port(#0x1930) = #0x0006 "); //WU_DIR input & LDO & BG shutdown

// following instruction can or can not continue?

asm(" *port(#0x1920) = #0x803F "); //clear interrupt flags

// Enter RTC-only

while (1){

.............

.......

}

Regards
William Zhu

Thanks for your help.  Now, the wakeup from RTC Alarm can work well according to your document.

Steve: That's great! Please post your working code for others to share.

1: From the program behavior,  I found the system will restart completly after wakeup,  right or wrong?

A1: Since RTC-Only mode shuts down all LDOs powering the device, specifically the DSP, as such. when power is backed up, it is same as a restart from beginning.

2: And another question is where the DSP instruction will stop after power BG_PD and LDO_PD is setted by 1.

A2: The DSP will continue to execute instructions till the power drops down below the minimum operation level (you can find it in datasheet). The time is various, thus, you should assume valid operation stops after power BG_PD and LDO_PD is set.

Regards.

Hi Steve

Please read following code.  There are three wakeup method, including external wakeup, RTC alarm and RTC

periodic interrup.   I choose periodic interrup for 1 second.   Please check the following code.

This instruction can enable it.

asm(" *port(#0x1924) = #0x0022 "); //EXTINTEN enabled and second periodic interrup

When this program is running,  Led will light and delay a long time,  and then be turned off for 1 second.

This procedure will repeat again and again.  It proves periodic interrup works well as our expected.

void main(void) {

        Uint16 temp1920, temp1924;

        Uint32 i;

        // when system wake up  the led will be last a long time.  It's easy to judge wakeup is successful or not.   

        for(i=0; i<10000000; i++);    // delay and watch LED

       asm(" @#IFR0_L = #0xffff || mmap() "); // clear int flags
        asm(" @#IER0_L = #0x0000 || mmap() "); // set RTC int
        asm(" @#IFR1_L = #0xffff || mmap() "); // clear int flags
        asm(" @#IER1_L = #0x0004 || mmap() "); // set RTC int
        asm(" bit(ST1,#11) = #0 "); // GLOBAL INTERRUPT ENABLE


// RTC configure


        asm(" *port(#0x1920) = #0x803F "); //clear interrupt flags

        asm(" *port(#0x1900) = #0x0001 "); //RTCINTEN enabled

        asm(" *port(#0x1924) = #0x0022 "); //EXTINTEN enabled and second periodic interrup

        asm(" *port(#0x1930) = #0x0000 "); //WU_DIR input


        do // waiting until RTC interrupt is enabled in the RTC domain could take 2 RTC clocks for write to propagate

        {

                temp1924 = *(volatile ioport unsigned int *) (0x1924);

        } while ((temp1924&0x0022)==0);


        temp1920 = *(volatile ioport unsigned int *) (0x1920);

        if ((temp1920&0x0022)!=0)

        {

                asm(" *port(#0x1920) = #0x803F "); //clear interrupt flags

        }


        asm(" *port(#0x1930) = #0x0006 "); //WU_DIR input & LDO & BG shutdown

        asm(" *port(#0x1920) = #0x803F "); //clear interrupt flags


// Enter RTC-only

        while (1)

        {

                temp1920 = *(volatile ioport unsigned int *) (0x1920);

                if ((temp1920&0x0022)!=0)

                {

                asm(" *port(#0x1920) = #0x803F "); //clear interrupt flags

                asm(" *port(#0x1930) = #0x0006 "); //WU_DIR input & LDO & BG shutdown

                asm(" *port(#0x1920) = #0x803F "); //clear interrupt flags

                }

        }

}

// Interrupt code

interrupt void rtc_isr (void)
{

    asm(" @#IFR1_L = #0xffff || mmap() "); // clear int flags
    
    asm(" *port(#0x1920) = #0x803F "); // clear flags
    
    asm(" *port(#0x1930) = #0x0006 "); //WU_DIR input & LDO & BG shutdown
    
    asm(" *port(#0x1920) = #0x803F "); // clear flags
    
    asm(" *port(#0x1924) = #0x0022 ");  //EXTINTEN enabled and second periodic interrup

}