Time

millis(), micros(), delay(), delayMicroseconds(). More...

Functions
unsigned long	millis (void)
	Milliseconds since the board started.
unsigned long	micros (void)
	Microseconds since the board started, with 1 µs resolution (4 µs on an Uno).
void	delay (unsigned long)
	Waits a number of milliseconds.
void	delayMicroseconds (unsigned int us)
	Waits a number of microseconds, exactly, by busy-waiting.

Detailed Description

millis(), micros(), delay(), delayMicroseconds().

All use the RP2040's microsecond timer, so they are exact at every Tools > CPU Speed setting.

Function Documentation

delay()

void delay

(

unsigned long

)

Waits a number of milliseconds.

Interrupts, USB Serial and tones keep running. Calls yield() while waiting. With FreeRTOS it blocks the calling task, so other tasks run meanwhile (FreeRTOS).

Examples

AnalogAveraging.ino, AnalogBurst.ino, AnalogDifferential.ino, AnalogMillivolts.ino, AnalogReadMultiple.ino, FreeRtosTasks.ino, I2CScanner.ino, MulticoreBasics.ino, SpiLoopback.ino, and UsbPdPower.ino.

delayMicroseconds()

void delayMicroseconds

(

unsigned int

us

)

Waits a number of microseconds, exactly, by busy-waiting.

Parameters

us	Time in µs.

micros()

unsigned long micros

(

void

)

Microseconds since the board started, with 1 µs resolution (4 µs on an Uno).

Returns

Time in µs. Goes back to 0 after about 71.6 minutes, so compare times by subtracting: micros() - start.

millis()

unsigned long millis

(

void

)

Milliseconds since the board started.

Returns

Time in ms. Goes back to 0 after about 49.7 days.

Examples

AnalogBurstBackground.ino, FreeRtosQueue.ino, MulticoreFifo.ino, and UsbPdPower.ino.