topic Re: Cannot wakeup from SNVS mode in SLN-LOCAL2-IOT development kit in i.MX RT Crossover MCUs

Cannot wakeup from SNVS mode in SLN-LOCAL2-IOT development kit

dashdwan — Mon, 01 Nov 2021 10:43:45 GMT

Hi,

I have already posted the same issue here which was advised to post in this community.

I have have been modifying the source code since last week and yet the wakeup pin doesn't seems working.

This is how the Low power mode was entered.

I had also tried configuring the WAKEUP pin as:

This did not worked!!

Then I was advised to set WAKEUP as NMI. I changed it as:

Yet, I don't see any progress!!

Please help me set the wakeup pin; is there any other configurations i should modify?

Re: Cannot wakeup from SNVS mode in SLN-LOCAL2-IOT development kit

kerryzhou — Tue, 02 Nov 2021 07:22:56 GMT

Hi @dashdwan ，

Welcome to the MIMXRT community, I would like to help you.

Please note, WAKEUP pin is the special pin, not the GPIO pin. You may mix the pin which can wake up the low power with the WAKEUP pin.

Please read this RT1060 low power application note at first:

https://www.nxp.com/docs/en/application-note/AN12245.pdf

So, please check the low power mode you want to use, if you use system idle, low power idle, suspend these low power mode, you add the other GPIO for the interrupt, it's OK to wake up the low power.

But, if you want to use the SNVS, then you just can use the special WAKEUP PIN, GPIO5_IO00, no other GPIO pins.

Wish it helps you!

If you still have questions about it, please kindly let me know.

Best Regards,

Kerry

Re: Cannot wakeup from SNVS mode in SLN-LOCAL2-IOT development kit

dashdwan — Tue, 02 Nov 2021 07:34:03 GMT

Hi Kerry,
Thanks for responding.

I need to use the SNVS mode. As i mentioned in the previous thread, I tried entering the SNVS mode as mentioned in the Application Note (as shown below):

After this when i give a low signal to the WAKEUP pin, it should wake the target right?

But this is not happening in my case. I wanted to know whether there is any additional changes to be made in order to wake up the device from SNVS mode. Could you please help me with that?

Also, feel free to correct me if I have got any of the points wrong.

Re: Cannot wakeup from SNVS mode in SLN-LOCAL2-IOT development kit

kerryzhou — Tue, 02 Nov 2021 07:41:29 GMT

HI @dashdwan

Tell me which detail pin in the SLN-LOCAL2-IOT hardware you used as the WAKEUP pin, just help you to check it.

BTW, how do you determine the chip is not waked up.

Best Regards,

Kerry

Re: Cannot wakeup from SNVS mode in SLN-LOCAL2-IOT development kit

dashdwan — Tue, 02 Nov 2021 09:00:56 GMT

I have used the L6 pin (GPIO5) as wakeup pin:

I am implementing an LED blink function like the code snippet shown below.

void led_task(void *arg)
{
while(1)
{
RGB_LED_SetColor(LED_COLOR_GREEN);
vTaskDelay(3000);
RGB_LED_SetColor(LED_COLOR_PURPLE);
vTaskDelay(3000);
RGB_LED_SetColor(LED_COLOR_YELLOW);
vTaskDelay(3000);
RGB_LED_SetColor(LED_COLOR_WHITE);
vTaskDelay(3000);
RGB_LED_SetColor(LED_COLOR_RED);
vTaskDelay(5000);

SNVS->LPCR |= SNVS_LPCR_TOP_MASK;
while(1)
{
}
}
}

I tested with this code, the system stops the LED blinking, but doesn't start again after initiating the wakeup.

I hope it's clear.

Re: Cannot wakeup from SNVS mode in SLN-LOCAL2-IOT development kit

kerryzhou — Tue, 02 Nov 2021 10:03:25 GMT

Hi @dashdwan ,

Thanks for your information.

Your used referece code checking, you are using the RT1060 SDK code:

SDK_2_10_1_EVK-MIMXRT1060\boards\evkmimxrt1060\demo_apps\power_mode_switch\rtos

Right?

Please confirm it!

if you are not use the above code, you need to make sure the wakeup pin configuration in the pin_mux.c

/* GPIO configuration of SD_PWREN on WAKEUP (pin L6) */
gpio_pin_config_t SD_PWREN_config = {
.direction = kGPIO_DigitalInput,
.outputLogic = 0U,
.interruptMode = kGPIO_IntRisingEdge
};
/* Initialize GPIO functionality on WAKEUP (pin L6) */
GPIO_PinInit(GPIO5, 0U, &SD_PWREN_config);
/* Enable GPIO pin interrupt on WAKEUP (pin L6) */
GPIO_PortEnableInterrupts(GPIO5, 1U << 0U);

IOMUXC_SetPinMux(IOMUXC_SNVS_WAKEUP_GPIO5_IO00, 0U);

void APP_WAKEUP_GPT_IRQn_HANDLER(void)
{
GPT_ClearStatusFlags(APP_WAKEUP_GPT_BASE, kGPT_OutputCompare1Flag);
GPT_StopTimer(APP_WAKEUP_GPT_BASE);
LPM_DisableWakeupSource(APP_WAKEUP_GPT_IRQn);

xSemaphoreGiveFromISR(s_wakeupSig, NULL);
portYIELD_FROM_ISR(pdTRUE);
__DSB();
}

Tomorrow, I will help you to test it on my SLN-LOCAL2-IOT board, then give you feedback.

Best Regards,

kerry

Re: Cannot wakeup from SNVS mode in SLN-LOCAL2-IOT development kit

dashdwan — Tue, 02 Nov 2021 10:18:02 GMT

Hi @kerryzhou

Thanks for your response. I am using a different SDK right now, so I will try these changes in the pin_mux.c file and get back to you soon.

Re: Cannot wakeup from SNVS mode in SLN-LOCAL2-IOT development kit

dashdwan — Tue, 02 Nov 2021 14:27:36 GMT

Hi @kerryzhou

I tried the configurations mentioned in the previous post, except this (i guess this function has few more dependencies):

void APP_WAKEUP_GPT_IRQn_HANDLER(void)
{
GPT_ClearStatusFlags(APP_WAKEUP_GPT_BASE, kGPT_OutputCompare1Flag);
GPT_StopTimer(APP_WAKEUP_GPT_BASE);
LPM_DisableWakeupSource(APP_WAKEUP_GPT_IRQn);

xSemaphoreGiveFromISR(s_wakeupSig, NULL);
portYIELD_FROM_ISR(pdTRUE);

__DSB();
}

Still i was unable to wake the target.

Re: Cannot wakeup from SNVS mode in SLN-LOCAL2-IOT development kit

kerryzhou — Wed, 03 Nov 2021 09:54:39 GMT

Hi @dashdwan

Today, I porting one low power SNVS mode, and wake up with the WAKEUP pin(TP1->GND J7_1) , it works OK.

Please use my attached code, you can download the code to the SLN-LOCAL2-IOT board, after POR, the led will blinking blue, then enter SNVS mode, when you use the WAKEUP pin connect to GND, chip reset, the blue led blinking again.

Check my video:

(view in My Videos)

Wish it helps you!

If you still have questions about it, please kindly let me know!

Best Regards,

Kerry

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Re: Cannot wakeup from SNVS mode in SLN-LOCAL2-IOT development kit

dashdwan — Fri, 05 Nov 2021 06:04:29 GMT

Hi @kerryzhou

Thanks a lot! This code worked for me. But i have 2 queries on this:

I suspect, on waking up, does the program restart from main function itself? It doesn't seem to resume from the same point where it was sent to SNVS mode. What do you think about this?
Could you please elaborate what were those changes made by you in the code to get this wake up? I'd just like to know why it wasn't working for me. Is there any functions to be added or any other configuration changes?

Re: Cannot wakeup from SNVS mode in SLN-LOCAL2-IOT development kit

kerryzhou — Fri, 05 Nov 2021 10:03:22 GMT

Hi @dashdwan

Answer your questions:

1 I suspect, on waking up, does the program restart from main function itself? It doesn't seem to resume from the same point where it was sent to SNVS mode. What do you think about this?

- Answer: Yes, the SNVS mode wake is the reset boot. It's correct. if you need to resume from the low power enter area, you need to use other low power mode instead of the SNVS mode.

2 Could you please elaborate what were those changes made by you in the code to get this wake up? I'd just like to know why it wasn't working for me. Is there any functions to be added or any other configuration changes?

- Answer: In fact, if your low power code configuration is correct, my previous mentioned wakeup code is OK. As the WAKEUP pin will trigger the interrupt to wakeup.

Wish it helps you!

Best Regards,

Kerry

Re: Cannot wakeup from SNVS mode in SLN-LOCAL2-IOT development kit

dashdwan — Fri, 05 Nov 2021 14:26:16 GMT

Thanks @kerryzhou

One more quick query,

Does suspend mode wake also reset boot?

Re: Cannot wakeup from SNVS mode in SLN-LOCAL2-IOT development kit

kerryzhou — Mon, 08 Nov 2021 03:17:55 GMT

Hi @dashdwan

Sorry for my later reply!

Suspend also reset wakeup.

above suspend, it is the continue wakeup.

Press A for enter: Over RUN - System Over Run mode
Press B for enter: Full RUN - System Full Run mode
Press C for enter: Low Speed RUN - System Low Speed Run mode
Press D for enter: Low Power RUN - System Low Power Run mode
Press E for enter: System Idle - System Wait mode
Press F for enter: Low Power Idle - Low Power Idle mode
Press G for enter: Suspend - Suspend mode
Press H for enter: SNVS - Shutdown the system

Wish it helps you!

Best Regards,

Kerry