Periodic Operation

Digital I/O
Analog I/O
Advanced I/O
Time
Math
Trigonometry
Random Numbers
Bits and Bytes
Interrupts
Serial Comm.

Servo Motor
Stepping Motor
Character LCD
EEPROM
SPI
I²C (Wire)
SD Card
SD (File Operations)
Ethernet
Ethernet (Server)
Ethernet (Client)
Firmata
Periodic Operation
Power Save
Clock (RTC)
SoftwareSerial
Utility

This library allows users to call a function periodically.

attachCyclicHandler

Description

Specifies a cyclic call back function. The specified call back function is called at the cycle specified by this function.

Syntax

attachCyclicHandler(unsigned char number, void(*)(unsigned long) function, unsigned int time)

Parameters

number: ID (0 to 7)
function: Function of the interval timer interrupt
time: Interval time in ms

Returns

None

detachCyclicHandler

Description

Turns off the interval call back function.

Syntax

detachCyclicHandler(unsigned char number)

Parameters

number: ID (0 to 7)

Returns

None

Note

The cyclic handler is executed in loop.

attachIntervalTimerHandler

Description

Specifies a call back function executed in the interval timer interrupt handler. The specified call back function is called every 1ms of the interval timer interrupt once it's attached.

Syntax

attachIntervalTimerHandler(void(*)(unsigned long) function)

Parameters

function: Name of the handler

Returns

None

detachIntervalTimerHandler

Description

Turns off the call back function in the interval timer interrupt handler.

Syntax

detachIntervalTimerHandler()

Parameters

None

Returns

None

attachMicroIntervalTimerHandler

Description

Specifies a call back function executed in the interval timer interrupt handler. The specified call back function is called in time specified parameter[us].

Syntax

attachIntervalTimerHandler(void(*)(unsigned long) function, uint16_t interval)

Parameters

function: Name of the handler
interval: Interval time[us]

Returns

None

Remark

The following libraries can be called in the handler:
pinMode(), digitalWrite(), digitalRead(), millis(), micros(), delayMicroseconds(), min(), max(), constrain(), map(), lowByte(), highByte(), bitRead(), bitWrite(), bitSet(), bitClear(), bit(), randomSeed(), random()
Note: pinMode(), digitalWrite() may use the pins that are used in function loop(), which may causes a mis-operation.
tone() is disabled after setting a function. Modify HOOK_TIMER_CHANNEL when you want to change from tone().

detachIntervalTimerHandler

Description

Turns off the call back function in the interval timer interrupt handler.

Syntax

detachIntervalTimerHandler()

Parameters

None

Returns

None

This example calls the cyclic function every 100ms, and outputs the returned time every 500ms.

        #include <Arduino.h>
        void test_cyclic_handler(unsigned long u32ms);
        unsigned long time;
            
        void setup()
        {
            Serial.begin(9600);
            attachCyclicHandler(0, test_cyclic_handler, 100);
        }
            
        void loop()
        {
            Serial.println(time);
            delay(500);
        }
            
        void test_cyclic_handler(unsigned long u32ms)
        {
            time = u32ms;
        }