10. Interrupts

This chapter deals with generation of interrupts on ARM Cortex M4 Tiva C Series microcontrollers. Whenever a switch is pressed, there are two ways to read its input, one is through polling and other is through interrupt. The algorithm mentioned in Chap. 9 in Sect. 2 is polling method. In that, processor is always checking the state of the pin, which is actually wasting the clock cycles of the processor to keep on checking the input, these clock cycles could be used to perform some other task which can improve the efficiency of the processor. As when switch is pressed, state is changing from logic high to logic low, and this state change on the GPIO pin itself requests the processor to perform certain task. This will lead to development of efficient system and these requests to the processors are known as interrupts.