Table of Contents
ItimerStart()
ItimerStart() starts the configured callback timer.
bool ItimerStart()
bool ItimerStart(uint8_t timerNumber)
Commands
| Command | Arguments | Return Value | Operation |
|---|---|---|---|
ItimerStart() | None | bool | Starts the configured callback timer. |
Example
This uses the default callback timer (Timer2). The callback changes only a flag; serial output runs in loop().
volatile bool tick = false; void onTimer() { tick = true; } void setup() { Serial.begin(115200); if (!ItimerSet(1000, onTimer)) return; // Configure the callback and interval first. if (!ItimerStart()) return; // Start the configured default callback timer. } void loop() { if (tick) { noInterrupts(); tick = false; interrupts(); Serial.println(F("tick")); } }
Precautions
- The callback runs in an interrupt. Change only a flag there; do not call
delay(),Serial, I2C or SPI in it. - The callback timer without a timer number uses Timer2. Do not use it together with
tone()or PWM output that uses Timer2. - When specifying another hardware timer, check for conflicts with PWM, analog output and high-speed counter functions using it.
- Starting before
ItimerSet()has configured the timer returns false.