PPT-Interrupts

Tami Meredith PhD CSCI 3431 Why Devices need CPU access Eg NIC has a full buffer it needs to empty These device needs are often asynchronous and unrelated to the currently executing process. An Integrated Approach to Architecture and Operating Systems. Chapter 4. Processor Implementation. ©Copyright 2008 Umakishore Ramachandran and William D. Leahy Jr.. Interrupts, Traps and Exceptions. of the lecture. :. Chandana. :. 1. . Introduction. 2. Example . 3. Definition . 4. Vector table and . Maskable. /. nonmaskable. interrupts . ________________________________________________. Hao. :. Anurag Dwivedi. Let Us Revise. Micro-Controllers. A small . computer integrated . in . a single IC. Has I/O pins, . RAM and Memory. We Use . Atmega. 16. Software Used. CvAvr. : Editor and Compiler. Interrupt Descriptor Table. Slide #. 2. IDT specified as a segment using the IDTR register . Slide #. 3. Calling the IRQ handler. Interrupt Context. Exceptions. First 32 IRQ vectors in IDT. Correspond to events generated by the CPU. Lesson 11. Arduino Interrupts. Arduino Interrupts. 1. Interrupts Overview. An interrupt is a hardware event. The processor stops what it was doing and calls the code at a specific location, determined by the type of interrupt. Design of Microprocessor-Based Systems. Mark . Brehob. University of Michigan. Lecture 6. : Interrupts. January 30. th. . Slides developed in part by . Prof. Dutta. Announcements. Behind due to snow…. Mutual Exclusion with Hardware Support. Thomas Plagemann. With slides from. Otto J. Anshus & Tore Larsen. (University of Tromsø). and Kai Li. (. Princeton University. ). Preemptive Scheduling. Interrupt Handling. David Ferry, Chris Gill. CSE 522S - Advanced Operating Systems. Washington University in St. Louis. St. Louis, MO 63130. 1. Why Interrupts?. Interrupts allow a currently executing process to be preempted. Fall 2009. Kipp Schoenwald. Stephen . Hunte. Joseph Storey. Outline. Interrupts . Vectors and Vector Table. Flow Chart. Applications. Example 1. Example 2. Thermistors. Theory. Applications. Opto-isolators. Interrupts. . Prof. Chung-Ta King. Department of Computer Science. National Tsing Hua University, Taiwan. Materials from . MSP430 Microcontroller Basics. , John H. Davies, Newnes, 2008. 1. From Clock to Timer to CPU. David Ferry, Chris Gill. CSE 422S - Operating Systems Organization. Washington University in St. Louis. St. Louis, MO 63130. 1. Why Interrupts?. Interrupts allow a currently executing process to be preempted. Opto. -isolators, . Triacs. , and Thermistors. Alex Buchanan. Aaron May. Peter Ngo. Reason for Interrupts. You might want a certain subroutine executed immediately after a request from an external device or from an internal program, providing certain conditions are met.. Fall 2014. Hadi Esmaeilzadeh. hadi@cc.gatech.edu. . Georgia Institute of Technology. Some slides adopted from Prof. . Milos . Prvulovic. Better Devices. Now SW, KEY can be read. Problem: several instructions needed to detect change. disable interrupts // Must finish put on queue of threads waiting for lock set guard to 0 call switch enable interrupts else value BUSY guard 0 LockRelease Why disable interrupts N