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. Chung-Ta King. National . Tsing. . Hua. University. CS 4101 . Introduction to Embedded Systems. Introduction. In this lab, we will learn. The interrupt of Timer_A in MSP430. The interrupt of port P1 in MSP430. 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. 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. 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 | . Busy waiting. SFRs for . Interrupt. IP: Interrupt Priority Register. IE: Interrupt Enable Register. SCON contains RI, TI. TCON contains EX0, EX1, TF0, TF1. The 8051 has five interrupt sources.. . Two . Computer Science & Engineering Department. Arizona State University . Tempe, AZ 85287. Dr. Yann-Hang Lee. yhlee@asu.edu. (480) 727-7507. Preemptive Context Switching. Hardware Interrupt. Thread A. The materials of this lecture can be found in A7-A8 (3. rd. Edition) and B7-B8 (4. th. Edition). . The MIPS memory . Actually, everything above 0x7fffffff is used by the system.. What is in there?. 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 . s and. . Time. r. s. An. . embed. d. ed. . s. y. s. t. em. . h. a. v. e. . t. o. . r. espo. n. d. . t. o. . e. v. e. n. ts. . whe. r. e. . t. i. m. i. ng. . i. s. . a. . k. e. y. c. on. s. . OR. A Software-generated CALL (internally derived from the execution of an instruction or by some other internal event. An interrupt is used to cause a temporary halt in the execution of program. .