It is this latched flag that actually generates the interrupt request. Most but not all interrupt requests are latched, which means the interrupt event sets a flag that stays set even if the interrupt event then goes away. Again this is in general terms, and different microcontroller designs may do things somewhat differently, but the basics remain the same. It's time to look a little closer at what happens in an interrupt request and response. Part 14: Introduction to Microcontrollers - Ada - 7 Segments and Catching ErrorsĪ Little More Detail About The Interrupt Mechanism.Part 13: Introduction to Microcontrollers - 7-segment displays & Multiplexing.Part 12: Introduction to Microcontrollers - Driving WS2812 RGB LEDs.Part 11: Introduction to Microcontrollers - Button Matrix & Auto Repeating.Part 10: Introduction to Microcontrollers - Buttons and Bouncing.Part 9: Introduction to Microcontrollers - More Timers and Displays.Part 8: Introduction to Microcontrollers - Adding Some Real-World Hardware.Part 7: Introduction to Microcontrollers - Timers.Part 6: Introduction to Microcontrollers - More On Interrupts.Part 5: Introduction to Microcontrollers - Interrupts.Part 4: Introduction to Microcontrollers - More On GPIO.Part 3: Introduction to Microcontrollers - Hello World.Part 2: Introduction to Microcontrollers - Further Beginnings.Part 1: Introduction to Microcontrollers - Beginnings.For example, Linux can disable acceptance of interrupts from the particular device or disable interrupt acceptance at all. As you can see, by manipulation on the Interrupt flag in the CPU and communication with interrupt controller, Linux kernel is able to control the interrupt acceptance. If CPU finds that there is waiting request AND Interrupt Enable flag is set in the internal CPU control register then CPU starts interrupt handling. CPU after completion of execution of each instruction CPU does check is there any waiting interrupt requests from the interrupt controller. Interrupt controller pass collected interrupt requests to the CPU sequentially. Interrupt controller is able to temporally disable particular interrupt request line (IRQL) and reenable it again (IRQL masking). It also responsible for determination of the order in which interrupt signals will be passed to CPU. These signals are multiplexed by interrupt controller, which is responsible for interrupt signals collection. They assert interrupt request lines when they want attention from operating system kernel. Peripheral hardware devices are responsible for interrupt generation. First of all participants involved in interrupt handling are peripheral hardware devices, interrupt controller, CPU, operating system kernel and drivers.
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