AN3129 Datasheet, PDF (1/12 Pages) STMicroelectronics – Real-time performance using FIQ interrupt handling in SPEAr MPUs

AN3129
Application note
Real-time performance using FIQ interrupt handling
in SPEAr MPUs
Introduction
This application note provides information for software developers on how to use the (FIQ)
(fast interrupt request) mechanism with Linux in the SPEAr embedded MPU family.
It is divided into four sections:
Section 1 describes the interrupt logic on SPEAr platform.
Section 2 provides a detailed introduction to the FIQ interrupt handling hardware
mechanism and interrupt latency in the Linux kernel.
Section 3 describes the FIQ interrupt handler software.
Section 4 gives the results of interrupt latency measurements performed with Linux running
on a SPEAr evaluation board.
January 2010
Doc ID 16927 Rev 1
1/12
www.st.com