Beginning Arduino Programming by Brian Evans

Author:Brian Evans
Language: eng
Format: epub, pdf
Publisher: Apress®
Published: 2011-10-10T16:00:00+00:00

attachInterrupt()

The attachInterrupt() function enables hardware interrupts and links a hardware pin to an ISR to be called when the interrupt is triggered. This function also specifies the type of state change that will trigger the interrupt. Its syntax follows:

attachInterrupt(interrupt, function, mode)

The first parameter is the number of the interrupt. On the Arduino Uno there are only two possible hardware interrupts, 0 and 1, which correspond to digital pins 2 and 3 respectively. Note that this parameter refers to the interrupt number and not the pin number. The second parameter is the name of the function that will serve as the interrupt service routine that we will want to execute when the interrupt is triggered. Finally, we have the mode that represents the specific state change that will cause the interrupt to trigger. There are four possible modes, as shown in Figure 7-7, which include LOW, CHANGE, RISING, and FALLING.

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