83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
/*
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Deep Sleep with External Wake Up
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=====================================
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This code displays how to use deep sleep with
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an external trigger as a wake up source and how
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to store data in RTC memory to use it over reboots
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This code is under Public Domain License.
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Hardware Connections
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======================
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Push Button to GPIO 33 pulled down with a 10K Ohm
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resistor
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NOTE:
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======
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Only RTC IO can be used as a source for external wake
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source. They are pins: 0,2,4,12-15,25-27,32-39.
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Author:
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Pranav Cherukupalli <cherukupallip@gmail.com>
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*/
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#define BUTTON_PIN_BITMASK 0x200000000 // 2^33 in hex
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RTC_DATA_ATTR int bootCount = 0;
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/*
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Method to print the reason by which ESP32
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has been awaken from sleep
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*/
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void print_wakeup_reason(){
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esp_sleep_wakeup_cause_t wakeup_reason;
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wakeup_reason = esp_sleep_get_wakeup_cause();
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switch(wakeup_reason)
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{
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case 1 : Serial.println("Wakeup caused by external signal using RTC_IO"); break;
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case 2 : Serial.println("Wakeup caused by external signal using RTC_CNTL"); break;
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case 3 : Serial.println("Wakeup caused by timer"); break;
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case 4 : Serial.println("Wakeup caused by touchpad"); break;
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case 5 : Serial.println("Wakeup caused by ULP program"); break;
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default : Serial.println("Wakeup was not caused by deep sleep"); break;
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}
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}
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void setup(){
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Serial.begin(115200);
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delay(1000); //Take some time to open up the Serial Monitor
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//Increment boot number and print it every reboot
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++bootCount;
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Serial.println("Boot number: " + String(bootCount));
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//Print the wakeup reason for ESP32
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print_wakeup_reason();
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/*
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First we configure the wake up source
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We set our ESP32 to wake up for an external trigger.
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There are two types for ESP32, ext0 and ext1 .
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ext0 uses RTC_IO to wakeup thus requires RTC peripherals
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to be on while ext1 uses RTC Controller so doesnt need
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peripherals to be powered on.
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Note that using internal pullups/pulldowns also requires
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RTC peripherals to be turned on.
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*/
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esp_sleep_enable_ext0_wakeup(GPIO_NUM_33,1); //1 = High, 0 = Low
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//If you were to use ext1, you would use it like
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//esp_sleep_enable_ext1_wakeup(BUTTON_PIN_BITMASK,ESP_EXT1_WAKEUP_ANY_HIGH);
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//Go to sleep now
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Serial.println("Going to sleep now");
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esp_deep_sleep_start();
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Serial.println("This will never be printed");
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}
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void loop(){
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//This is not going to be called
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}
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