![]() ![]() This code implements a classic strategy known as polling. #define INPUT_PIN 0 // digital input pin 0 Hardware interrupts are meanwhile triggered by hardware whether internal such as a real time clock indicating a second has elapsed or external via a signal on an interrupt capable digital IO pin.Ĭonsider an Arduino program which checks a digital IO pin each time through the loop function that toggles a boolean variable if the pin is low and then uses the value of that boolean variable to determine which other actions to take. A software interrupt is triggered by a software condition such as an error like division by zero. Microprocessors typically provide for a range of interrupts which are divided into two flavors, software interrupts and hardware interrupts. An interrupt stops the microprocessor from following the normal flow and causes it to execute a different block of code, typically resuming the normal flow of your code once done. These instructions, even the branching instructions, are the normal flow of your program. Some of those instructions are what we call flow control or branching instructions which cause execution to take different paths, think if-else statement blocks. Normally a microprocessor executes a set of instructions, your code, in a sequence. ![]() Interrupts when used correctly simplify code, speed execution on hardware, and allow projects to do more with less powerful hardware. Interrupts have a reputation for being tricky and an unnecessary complication to just get code running. ![]()
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