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#include "Timer.h"
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hw_timer_t * timer = NULL;
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volatile SemaphoreHandle_t timerSemaphore;
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portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED;
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volatile uint32_t isrCounter = 0;
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volatile uint32_t lastIsrAt = 0;
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void IRAM_ATTR onTimer(){
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// Increment the counter and set the time of ISR
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portENTER_CRITICAL_ISR(&timerMux);
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isrCounter++;
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lastIsrAt = millis();
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portEXIT_CRITICAL_ISR(&timerMux);
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// Give a semaphore that we can check in the loop
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xSemaphoreGiveFromISR(timerSemaphore, NULL);
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// It is safe to use digitalRead/Write here if you want to toggle an output
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}
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void setupTimer(){
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// Create semaphore to inform us when the timer has fired
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timerSemaphore = xSemaphoreCreateBinary();
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// Use 1st timer of 4 (counted from zero).
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// Set 80 divider for prescaler (see ESP32 Technical Reference Manual for more
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// info).
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timer = timerBegin(0, 80, true);
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// Attach onTimer function to our timer.
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timerAttachInterrupt(timer, &onTimer, true);
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// Set alarm to call onTimer function every second (value in microseconds).
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// Repeat the alarm (third parameter)
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timerAlarmWrite(timer, 1000000, true);
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// Start an alarm
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timerAlarmEnable(timer);
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}
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