PPT-Interrupt and Time Management in µC/OS-III

Akos Ledeczi EECE 6354 Fall 2017 Vanderbilt University Interrupt Basics Context Interrupt Service Routine ISR EnableDisable Nesting Interrupt disable time Interrupt response time between interrupt and start of user ISR execution. On/off state change. Living with the Lab. Gerald Recktenwald. Portland State University. gerry@pdx.edu. 2. User input features of the fan. Potentiometer for speed control. Continually variable input makes sense for speed control. Dr A . Sahu. Dept of Computer Science & Engineering . IIT . Guwahati. Outline. Introduction to peripheral. Non peripheral but outside MPU. Memory (RAM) . Type of peripheral (I/O). Characteristics of peripheral (I/O). Dr A . Sahu. Dept of Comp Sc & . Engg. . . IIT . Guwahati. Outline. NIC . Cards. Registers TX/RX, Statistics Counter. Network . Device . Driver (Skeleton). Kernel Counter. Jiffies, RTC, kernel timer. Tami Meredith, Ph.D.. CSCI 3431. Why?. Devices need CPU access. E.g., NIC has a full buffer it needs to empty. These device needs are often asynchronous and unrelated to the currently executing process. Akos Ledeczi. EECE . 6354. , Fall . 2015. Vanderbilt University. Interrupt Basics. Context. Interrupt Service Routine (ISR). Enable/Disable. Nesting. Interrupt disable time. Interrupt response: time between interrupt and start of user ISR execution. KL25 Timer Peripherals. PIT - Periodic Interrupt Timer. Can generate periodically generate interrupts or trigger DMA (direct memory access) transfers. TPM - Timer/PWM Module. Connected to I/O pins, has input capture and output compare support. An Integrated Approach to Architecture and Operating Systems. Chapter . 10. Input/Output. and Stable Storage. ©Copyright 2008 Umakishore Ramachandran and William D. Leahy Jr.. 10.1 Communication between the CPU and the I/O devices. 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. Lecture 5. Timer and Interrupts. Networked Embedded Systems. Pengyu. . Zhang. What time is the Apple Watch tracking?. Clock. (all the time | sec) . Alarm. (all the time | sec). Stopwatch . (when open | . Chapter 1 – Introduction (Pgs 3 – 42). Architecture Review. SGG see a computer system as:. Hardware : CPU, Memory, I/O, . communication. . *Operating System* - The rest of the course. Applications: Programs that do stuff (. Sachin. . Katti. EE107 . Fall 2017. Lecture . 3. Timers and Interrupts. What time is the Apple Watch tracking?. Clock. (all the time | sec) . Alarm. (all the time | sec). Stopwatch . (when open | . 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. Practice Exam Review Notes for LP1 posted. Review session: Next Monday during lecture.. Reminder: Lab 6 re-demo opportunity at office hours this week. Working on getting . Boilercasts. setup. supposed to be up today . MEGHA DEY. Linux Kernel Engineer. AGENDA. Evolution of I/O virtualization. Scalable I/O Virtualization (SIOV) architecture. The interrupt story so far. Need for Interrupt Message Store. Interrupt Message Store advantages.