FRDM-K22 RTC wakeup

nesrinemhiri — Thu, 02 Nov 2017 16:52:24 GMT

I want to configure my FRDM-K22F to wakeup from VLLS2 mode each 1second using RTCn can someone help to configure this.

I download the SDK library but I didn't find such example

Thanks for help

Re: FRDM-K22 RTC wakeup

mjbcswitzerland — Sun, 05 Nov 2017 02:08:17 GMT

Hi Nesrine

I have attached a binary file for the FRDM-K22F that will set itself to the VLSS2 mode and wake up via RTC alarm interrupt after a short delay.
Note that the wake-up is via a reset so the code restarts each time.

This is the sequence seen on the VCOM interface (UART at 115200 Baud):

Hello, world... FRDM-K22F
OS Heap use = 0x0479 from 0x6000
WOKEN - restoring WAIT mode

Serial number: 00
Software version V1.4.012
Device identification: KINETIS

     Main menu
===================
1              Configure LAN interface
2              Configure serial interface
3              Go to I/O menu
4              Go to administration menu
5              Go to overview/statistics menu
6              Go to USB menu
7              Go to I2C menu

   Admin. menu
===================
up               go to main menu
show_config      Show configuration
save             Save configuration to FLASH
reject           Reset non-saved changes
restore          Restore factory settings
show_time        Display date/time
set_time         Set time hh:mm:ss
set_date         Set Date dd:mm:yyyy
show_alarm       Display alarm d/t
set_alarm        Set alarm (date)(+)[time]
del_alarm        Delete alarm
show_lp          Show low power mode and options
set_lp           [option] Set low power mode
reset            Reset device
last_rst         Reset cause
help             Display menu specific help
quit             Leave command mode

Hello - this will show you how to use a RTC alarm
to restart the processor from a low leakage mode
We'll check the RTC is running first..

1.01.1970 00:00:51

#
1.01.1970 00:00:52

#
1.01.1970 00:00:53

#Now we set an alarm to fire in 4s time..

New alarm set
1.01.1970 00:00:58

#and we command going to VLLS2 mode....

#zzzzzzzzz...(we will wake at the RTC alarm and recover via reset)

The sequence repeats over and over again - as per your requirement (although I set longer times so that it can be better monitored).

The code that I used is as follows:

extern void fnQuickTask1(TTASKTABLE *ptrTaskTable)
{
    QUEUE_HANDLE        PortIDInternal = ptrTaskTable->TaskID;           // queue ID for task input
    unsigned char       ucInputMessage[HEADER_LENGTH];                   // reserve space for receiving messages
    static int iState = 0;
    switch (iState++) {
    case 0:
        fnInitiateLogin(ES_SERIAL_LOGIN);                               // start command line interface
        fnCommandInput("4\r\n", 3, SOURCE_SERIAL);                      // move to the admin menu
        uTaskerMonoTimer(TASK_DEV_1, (DELAY_LIMIT)(1.0 * SEC), 1);
        break;
    case 1:
        fnDebugMsg("\r\nHello - this will show you how to use a RTC alarm\r\n");
        fnDebugMsg("to restart the processor from a low leakage mode\r\n");
        uTaskerMonoTimer(TASK_DEV_1, (DELAY_LIMIT)(1.0 * SEC), 1);
        break;
    case 2:
        fnDebugMsg("We'll check the RTC is running first..\r\n");
        uTaskerMonoTimer(TASK_DEV_1, (DELAY_LIMIT)(0.2 * SEC), 1);
        break;
    case 3:
    case 4:
    case 5:
        fnCommandInput("show_time\r\n", 11, SOURCE_SERIAL); // show the present time
        uTaskerMonoTimer(TASK_DEV_1, (DELAY_LIMIT)(1.1 * SEC), 1);
        break;
    case 6:
        fnDebugMsg("Now we set an alarm to fire in 4s time..\r\n");
        fnCommandInput("set_alarm +4\r\n", 14, SOURCE_SERIAL); // set a RTC alarm to fire 4s into the future
        uTaskerMonoTimer(TASK_DEV_1, (DELAY_LIMIT)(0.2 * SEC), 1);
        break;
    case 7:
        fnDebugMsg("and we command going to VLLS2 mode....");
        fnSetLowPowerMode(VLLS2_MODE);
        fnDebugMsg("zzzzzzzzz...(we will wake at the RTC alarm and recover via reset)");
        break;
    }

while (fnRead(PortIDInternal, ucInputMessage, HEADER_LENGTH) != 0) { // read input queue to clear timer events
}
}

I did this in the uTasker project and using a single task to demonstrate the operation flow.
In addition, I first used code to configure the RTC to run from the board's 32kHz crystal
fnStartRTC(0); // start the RTC if it isn't yet operating
and I enabled a wake-up interrupt on SW2 and also on the RTC

    INTERRUPT_SETUP interrupt_setup;                                     // interrupt configuration parameters
    interrupt_setup.int_type       = WAKEUP_INTERRUPT;                   // configure as wake-up interrupt
    interrupt_setup.int_handler    = wakeup_interrupt;
    interrupt_setup.int_priority   = PRIORITY_PORT_C_INT;                // interrupt priority level
    interrupt_setup.int_port       = PORTC;                              // the port that the interrupt input is on
    interrupt_setup.int_port_bits = PORTC_BIT1;                         // the input connected (SW2 on FRDM-K22F)
    interrupt_setup.int_port_sense = (IRQ_FALLING_EDGE | PULLUP_ON);     // interrupt is to be falling edge sensitive
    fnConfigureInterrupt((void *)&interrupt_setup);                      // configure wake-up on port

    interrupt_setup.int_port = PORT_MODULE;                              // define a wake-up interrupt on a module
    interrupt_setup.int_port_bits = (MODULE_RTC_ALARM);                  // wake-up on RTC alarm interrupt
    fnConfigureInterrupt((void *)&interrupt_setup);                      // configure wake-up from RTC alarm

You can get the uTasker project at the links below to simply do this and many much more power-ful things without loss of development time.

Regards

Mark

Kinetis: http://www.utasker.com/kinetis.html
K22:
- http://www.utasker.com/kinetis/FRDM-K22F.html
- http://www.utasker.com/kinetis/TWR-K22F120M.html
- http://www.utasker.com/kinetis/BLAZE_K22.html

Re: FRDM-K22 RTC wakeup

danielchen — Mon, 06 Nov 2017 06:45:20 GMT

Hi nesrine mhiri

Just add to Mark's good comments, you also can also refer to the power_mode_switch demo under the KSDK installation folder.

SDK_2.2_FRDM-K22F\boards\frdmk22f\demo_apps\power_mode_switch

This demo is to show how to switch to different power modes, and how to configure a wakeup source and wakeup the MCU from low power modes.

Regards

Daniel

Re: FRDM-K22 RTC wakeup

nesrinemhiri — Mon, 06 Nov 2017 12:16:03 GMT

Hello,

Thank you for your help :smileyhappy:

where can i find the code of this function : fnSetLowPowerMode(VLLS2_MODE);

I check the example power switch mode but it is very complicated, i need a simpler code on how to enter VLLS2 mode and wake up from this mode each 1s using RTC .

Nesrine

Re: FRDM-K22 RTC wakeup

mjbcswitzerland — Tue, 07 Nov 2017 09:23:24 GMT

As mentioned, you can get a complete solution from the uTasker project on GitHub:
https://github.com/uTasker/uTasker-Kinetis

The routine fnSetLowPowerMode(VLLS2_MODE);
does (for your processor):
SMC_STOPCTRL = (SMC_STOPCTRL_VLLSM_VLLS2);
SMC_PMCTRL = (SMC_PMCTRL_RUNM_NORMAL | SMC_PMCTRL_STOPM_LLS);
SYSTEM_CONTROL_REGISTER |= SLEEPDEEP;

which prepares for the sleep mode, which is subsequently set using wfi instruction.

Regards

Mark

P.S. Note also that SMC_PMPROT has to be written to to enable the required low power mode(s) that will be used.
Since this is a write-once register it is best written during the board start-up so that all modes that may be required at any future time point are enabled.

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