94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
/*
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Deep Sleep with Touch Wake Up
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=====================================
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This code displays how to use deep sleep with
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a touch as a wake up source and how to store data in
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RTC memory to use it over reboots
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This code is under Public Domain License.
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Author:
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Pranav Cherukupalli <cherukupallip@gmail.com>
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*/
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#define Threshold 40 /* Greater the value, more the sensitivity */
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RTC_DATA_ATTR int bootCount = 0;
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touch_pad_t touchPin;
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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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/*
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Method to print the touchpad by which ESP32
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has been awaken from sleep
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*/
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void print_wakeup_touchpad(){
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touch_pad_t pin;
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touchPin = esp_sleep_get_touchpad_wakeup_status();
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switch(touchPin)
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{
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case 0 : Serial.println("Touch detected on GPIO 4"); break;
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case 1 : Serial.println("Touch detected on GPIO 0"); break;
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case 2 : Serial.println("Touch detected on GPIO 2"); break;
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case 3 : Serial.println("Touch detected on GPIO 15"); break;
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case 4 : Serial.println("Touch detected on GPIO 13"); break;
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case 5 : Serial.println("Touch detected on GPIO 12"); break;
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case 6 : Serial.println("Touch detected on GPIO 14"); break;
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case 7 : Serial.println("Touch detected on GPIO 27"); break;
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case 8 : Serial.println("Touch detected on GPIO 33"); break;
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case 9 : Serial.println("Touch detected on GPIO 32"); break;
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default : Serial.println("Wakeup not by touchpad"); break;
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}
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}
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void callback(){
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//placeholder callback function
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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 and touchpad too
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print_wakeup_reason();
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print_wakeup_touchpad();
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//Setup interrupt on Touch Pad 3 (GPIO15)
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touchAttachInterrupt(T3, callback, Threshold);
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//Configure Touchpad as wakeup source
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esp_sleep_enable_touchpad_wakeup();
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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 will never be reached
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}
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