March 23, 2017 - Calling micros() twice is in a row, takes nearly 50uS. Something line: uint32_t t0 = micros(); uint32_t t1 = micros(); uint32_t delta_t = t1 - t0; printf( "Delta = %u\n", delta_t ); // this prints around 51 on my system. Looking at the i...

September 16, 2020 - Hi all, Being aware of the following bug with micros() function in ESP32 arduino, I have jumped into the FOCutils.cpp file and seen that the bug is probably called ☹ The bug is explained here: https://github.com/espressif/arduino-esp32/issues/1168 Trust me micros() is not reliable with ESP32.

What Is micros() and Why Use It? The micros() function tells you how many microseconds have passed since the ESP32 started running. It’s like having an ultra-fast stopwatch in your program.

The fix is simple: ESP32 has timers with hardware predividers, so this small piece of code just sets up TIMG0_T0 to run on 1 MHz, dividing APB clock by 80. Then, micros() is just two instructions to read the 32-bit micros value from the timer.

May 31, 2022 - Hi everyone, I would like to measure a pulse duration of 32us (4 clock cycles at 125kHz). Therefor I set an interrupt on the according pin. The interrupt is triggered with the rising and falling edge and store the start & endtime with the funktion micros() in two diffrent variables.

April 26, 2018 - Board: ESP32 DEVKITV1 Core Installation/update date: 25/apr/2018 IDE name: Arduino IDE/IDF component Flash Frequency: 80Mhz Upload Speed: 115200 · micros() returns strange values when using arduino-esp32 as component of esp-idf, millis() returns ...

August 17, 2023 - TimeInUs = micros(); Seconds = TimeInMs / 1000000; Minutes = Seconds / 60; Hours = Minutes / 60; And you’d be better off using the millis() function instead if you need a larger time interval in the milliseconds range.

March 12, 2022 - On ESP32, micros() takes about 150 cycles. I'm using 80MHz CPU clock to avoid wasting power, delayMicroseconds() calls micros() at least twice. This means delayMicroseconds() takes at least 330 cycles, corresponding to a delay of more th...

unsigned long IRAM_ATTR micros() { return (unsigned long) (esp_timer_get_time()); } How can i solve this, without hacking the library? Is there a way to add an offset by app to esp_timer_get_time()? - Perhaps by using a wake stub, which adds a sleep time offset immediately after wake up? - Or is there a way to overwite the micros() function of arduino-esp32 with a customized version?

January 14, 2020 - uint32_t base = getBaseTime(); unsigned long startTime = micros(); waitForElapsedNs(base, 3000); unsigned long plus3us = micros(); waitForElapsedNs(base, 3000*1000); unsigned long plus3ms = micros(); waitForElapsedNs(base, 3000); unsigned long immediately = micros(); waitForElapsedNs(base, 1000*1000*1000); unsigned long plus1s = micros(); waitForElapsedNs(base, 3000); unsigned long another = micros(); Serial.print("3us later "); Serial.println(plus3us - startTime); Serial.print("3ms laster "); Serial.println(plus3ms - startTime); Serial.print("Immediately return "); Serial.println(immediately - startTime); Serial.print("1 second "); Serial.println(plus1s - startTime); Serial.print("Immediately "); Serial.println(another - startTime); The "immediately" and "another" should be returning VERY fast, with the while loop dropping out almost immediately.

March 3, 2018 - Here is the code test code: void test() { unsigned long startUs = micros(); unsigned long startMs = millis(); while (millis() < startMs + 10000) delay(1); unsigned long nowUs = micros(); unsigned long nowMs = millis(); Serial.printf("milliseconds elapsed: %ld\n", nowMs - startMs); Serial.printf("microseconds elapsed: %ld\n", nowUs - startUs); } When I call this test() function near program initialization, this is what I get: milliseconds elapsed: 10000 microseconds elapsed: 9999563

Hi All, Please let me know if anyone has achieved this type of micro seconds delay support in application firmware. I need 10 and 40 microseconds delay support as per request. ... The arduino-esp32 core achieves this using the following code for the delayMicroseconds() func.

May 18, 2017 - How I found it specifically in my case is I have a function that is passed the reference of either millis or micros to use to determine timing mathmatics for frequency calculations. It was expecting the pointer to be an unsigned long because that's what micros and millis are in everything Arduino, except for ESP32's codebase.

Get time in microseconds since boot. ... Get the timestamp when the next timer will expire. This function returns the alarm time of the timer that will expire soonest across all dispatch methods (TASK and ISR).

This function returns the number of microseconds since esp_timer was initialized, which usually happens shortly before app_main function is called.

October 17, 2017 - How to Get an Arduino Micros() Function With 0.5us Precision: I love Arduino microcontroller programming, and I regularly use it in aerospace research, as well as in home projects. As I work on my many home projects, however, I frequently find myself needing a very precise timer.

The micros() function returns the number of microseconds from the time, the Arduino board begins running the current program. This number overflows i.e. goes back to zero after approximately 70 minutes.

June 5, 2025 - This function returns the number of microseconds since the Arduino board began running the current program.