How can i solve the problem overflow of millis

This is my code If (millis() - t1 > 500){ …}

Hi,

Does anybody knows any library that is able to get the time in milliseconds from the ESP32 RTC? I need it because I'm interfacing a geophone and need the data with a correct timestamp and the sampling frequency is around 200 Hz.

Thanks in advance.

I want to make the pin high as soon as the code enters into the millis function and turn it off after some microseconds and again turn it on after some milliseconds. here I can create a microsecond delay using delayMcirosecond but how can create the delay in milliseconds as we can not use delay inside millis

Code: int Ad[] = {20, 7, 6, 9, 1, 7, 8, 1, 1, 1, 30, 8, 7}; float Af[] = {1, 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 23}; int Ap[] = {15, 25, 50, 50, 50, 90, 50, 50, 70, 50, 50, 50, 50};

int xa = sizeof(Ad) / sizeof(int); float ya = sizeof(Af) / sizeof(float); int za = sizeof(Ap) / sizeof(int);

void setup() { // put your setup code here, to run once: Serial.begin(115200); pinMode(26,OUTPUT);

} void w_a(int Ad1[], int x , float Af1[] , int y, int Ap1[], int z) { unsigned long previousMillis = 0; int i; for (i = 0; i < x; i++) { int d = Ad1[i] * 1000; float f = round((1 / Af1[i]) * 1000); int p = Ap1[i];

unsigned long currentMillis = millis();
previousMillis = currentMillis;
while (currentMillis - previousMillis < d)
{
  digitalWrite(26, HIGH);
  delayMicroseconds(p);
  digitalWrite(26, LOW);
  delay(f);
  currentMillis = millis();
}
previousMillis = currentMillis;

} }

void channel1_1() { int j = 0; for ( j = 0; j < 2; j++) { w_a(Ad, xa, Af, xa, Ap, xa); // A } }

void loop() { channel1_1(); }

Hey there! I am trying to implement non delay timer on Esp32 but every time I use millis() (tried micros() too) the Esp32 causes to panic. Is it a known issue? and how do you work around that?

Thanks

If your code includes many function on the main loop which call millis() for various timing needs, is it better to have a global variable which updates once per cycle with the value of millis() or is calling millis() seperatly many times perfectly fine?

We are talking 10-12 millis() calls per cycle at the moment.

The MCU is esp32