ESP32 Forum

Posted: **Thu Jul 06, 2017 10:37 pm**

I'm doing this to sleep my device:

esp_deep_sleep_enable_ext0_wakeup (GPIO_NUM_33, 0);

As my external pulse will remain LOW for a long time, I'd like to change the trigger level to the oposite.

I understand this can be done with a stub, but I'm not sure if it's really possible.

Is it possible, can anyone give an example?

Posted: **Fri Jul 07, 2017 2:29 am**

https://gist.github.com/igrr/54f7fbe051 ... d7fbecfeab

You have to change some stuff and add

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// Set level which will trigger wakeup
    SET_PERI_REG_BITS(RTC_CNTL_EXT_WAKEUP_CONF_REG, 0x1, level, RTC_CNTL_EXT_WAKEUP0_LV_S);

Posted: **Fri Jul 07, 2017 2:40 am**

There is a single bit you need to set or clear in order to change wakeup trigger level:
https://github.com/espressif/esp-idf/bl ... eep.c#L236

Posted: **Fri Jul 07, 2017 5:12 am**

Thank you both for your answers

I've tried with:

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static void RTC_IRAM_ATTR wake_stub()
{
  ets_printf(alive_prnt);
  SET_PERI_REG_BITS(RTC_CNTL_EXT_WAKEUP_CONF_REG, 0x1, 1, RTC_CNTL_EXT_WAKEUP0_LV_S);
}

the ets_printf is to know the function is executed. But it keeps having the same behavior, the esp goes to sleep and wakes up every time:

This is the serial output

rst:0x5 (DEEPSLEEP_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
wake_stub alive
ets Jun 8 2016 00:22:57

rst:0x7 (TG0WDT_SYS_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0x00
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0008,len:8
load:0x3fff0010,len:160
load:0x40078000,len:10632
load:0x40080000,len:252
entry 0x40080034
Boot number: 1
Wakeup was not caused by deep sleep
Going to sleep now
ets Jun 8 2016 00:22:57

This is repeated while I've the external source in LOW

Posted: **Fri Jul 07, 2017 5:43 am**

That's not what he meant. You also have to do the stuff at the bottom of the example gist.

Posted: **Fri Jul 07, 2017 6:03 am**

WiFive: sorry, i haven't noticed that you also mentioned the register to set wakeup level.

guillermop: The gist linked above *waits* while the input signal changes level again. You need to replace that part (https://gist.github.com/igrr/54f7fbe051 ... -L100-L111) with the line which will toggle the wakeup level setting. Something like

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int current_level = REG_GET_FIELD(RTC_CNTL_EXT_WAKEUP_CONF_REG, RTC_CNTL_EXT_WAKEUP0_LV);
REG_SET_FIELD(RTC_CNTL_EXT_WAKEUP_CONF_REG, RTC_CNTL_EXT_WAKEUP0_LV, !current_level);

Posted: **Sat Jul 08, 2017 9:54 am**

As I'm new with ESP, there some things I'm not familiar with, so as I understand now:

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#define PULSE_CNT_IS_HIGH() \
    ((REG_GET_FIELD(RTC_GPIO_IN_REG, RTC_GPIO_IN_NEXT) \
            & BIT(GPIO_NUM_33)) == 1)

PULSE_CNT_IS_HIGH (I've renamed) will check if the pin is still in high, which make the device wakes up.

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int current_level = REG_GET_FIELD(RTC_CNTL_EXT_WAKEUP_CONF_REG, RTC_CNTL_EXT_WAKEUP0_LV);

Will get the current level set in wakeup0

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REG_SET_FIELD(RTC_CNTL_EXT_WAKEUP_CONF_REG, RTC_CNTL_EXT_WAKEUP0_LV, !current_level);

Will set the opposite

That is what I've to wait the change

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do {
        while (PULSE_CNT_IS_HIGH()) {
          int current_level = REG_GET_FIELD(RTC_CNTL_EXT_WAKEUP_CONF_REG, RTC_CNTL_EXT_WAKEUP0_LV);
          REG_SET_FIELD(RTC_CNTL_EXT_WAKEUP_CONF_REG, RTC_CNTL_EXT_WAKEUP0_LV, !current_level);
        }
        // debounce, 10ms
        ets_delay_us(10000);
    } while (PULSE_CNT_IS_HIGH());

I'm almost sure I'm misunderstood something, I've also tried with other combinations but none of them give me the result I'm expecting

I appreciate your patience, sorry if what I'm doing is nonsense

Posted: **Sun Jul 09, 2017 7:44 am**

guillermop wrote:sorry if what I'm doing is nonsense

You're forgiven

Posted: **Sun Jul 09, 2017 9:12 pm**

WiFive wrote:
guillermop wrote:sorry if what I'm doing is nonsense
You're forgiven

Hahaha Thanks

after re-think about my problem I concluded that my approach was wrong, I was making a mountain out of a molehill.

So I solved first, storing the wake up level in the RTC memory. I've assigned the value of -1 to know if the device was booting for the first time or not.

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RTC_DATA_ATTR int wakeup_level = -1;

After that, I've checked the wake up level variable in memory, if it's the first time booting (-1) I assigned the stated I wanted, in this case LOW, otherwise the opposite current value

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if(wakeup_level == -1){
    wakeup_level = 0;
  }else{
    wakeup_level = !REG_GET_FIELD(RTC_CNTL_EXT_WAKEUP_CONF_REG, RTC_CNTL_EXT_WAKEUP0_LV);
  }

I finally set the external trigger with the value of wakeup_level

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esp_deep_sleep_enable_ext0_wakeup(GPIO_NUM_33, wakeup_level);

I don't know if it's the better/elegant solution for this problem, but at least it is working. Any suggestion will be appreciated.

Thanks you both for your help guys.

ESP32 Forum

[SOLVED] Change level wake after first wake up

[SOLVED] Change level wake after first wake up

Re: Change level wake after first wake up

Re: Change level wake after first wake up

Re: Change level wake after first wake up

Re: Change level wake after first wake up

Re: Change level wake after first wake up

Re: Change level wake after first wake up

Re: Change level wake after first wake up

Re: Change level wake after first wake up