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diff --git a/F2024/coe718/labs/lab2/report/movs.png b/F2024/coe718/labs/lab2/report/movs.png new file mode 100755 index 0000000..ee5b99f --- /dev/null +++ b/F2024/coe718/labs/lab2/report/movs.png Binary files differdiff --git a/F2024/coe718/labs/lab2/report/out.pdf b/F2024/coe718/labs/lab2/report/out.pdf new file mode 100644 index 0000000..70a20bf --- /dev/null +++ b/F2024/coe718/labs/lab2/report/out.pdf Binary files differdiff --git a/F2024/coe718/labs/lab2/report/profiling.png b/F2024/coe718/labs/lab2/report/profiling.png new file mode 100755 index 0000000..4fd13b6 --- /dev/null +++ b/F2024/coe718/labs/lab2/report/profiling.png Binary files differdiff --git a/F2024/coe718/labs/lab2/report/report.md b/F2024/coe718/labs/lab2/report/report.md new file mode 100644 index 0000000..0cbd9c4 --- /dev/null +++ b/F2024/coe718/labs/lab2/report/report.md @@ -0,0 +1,208 @@ +# Objective + +This lab project dives into embedded ARM programming by managing GPIO pins through various methods. +Each method achieves the same effect, +but with different performance characteristics. +Further, unique ARM architecture optimizations such as conditional execution and barrel shifting are explored. + +# Implementation + +## Software + +Building on the first lab, +Lab 2 requires exploring the compiled assembly of the project. +To set up the debugging environment, +several features were first enabled in the simulator: + +- _Execution Profiling > Show Times_: Used to measure CPU time for relevant sections of the code +- _C/C++ > Optimization > (O0|O3)_: Toggles compiler optimizations. + Although -O0 is measurably slower, + it is useful for inspecting raw instructions coherently before the compiler mangles the output for performance. + +Once enabled, +the debugger should provide output containing instructions alongside the corresponding c code, +notice the instructions with their respective execution time: + + + +## Hardware + +The project requires access to the GPIO pins of the board for LED access, +the SysTick implementation for introducing necessary delay, +as well as the LCD for debugging purposes. +The user manual for the LPC17xx chip was heavily consulted, +for gathering memory addresses useful for programming I/O, +and configuring the SysTick timer to provide useful interrupts. + +# Assignment + +The program can be logically considered as a small state machine, +that is configured to change state every 500ms. +Each state represents one of the three methods of accessing GPIO pins, +using its execution time to toggle an individual LED on GPIO ports 1 and 2. + +The `main()` function in this program is only used for chip configuration, +only running a few lines of code before looping indefinitely. +After initializing the LED ports, +the _SysTick_ timer is configured using the internal clock, +which will run its interrupt handler periodically. +This handler callback function is delegated the actual logic of the program, +which will run as the main thread is looping through no-ops. +The `SysTick_Handler()` function is used to implement the state transitions: +it is designed to run each millisecond, +but will accumulate a configured value of _ticks_ before actually transitioning. + +Each method of addressing is handled within its own function. +The decision to wrap the execution of each method within a function was made to present neat boundaries for measuring execution time of each method. +An example run is shown: + + + +The compiler is usually able to optimize out any static calculations through static analysis, +and each function will likely be inlined in _-O3 mode_, +thus, this method provides consistent measurements of the relevant part of each function: +writing bits to the specified addresses. + +# Results + +| Method | Time (-O0) | Time (-O3) | % Improvement | +| -------------------- | ---------- | ---------- | ------------- | +| Masking | 0.510us | 0.120us | 76.4% | +| `BitBand()` function | 0.180us | 0.040us | 77.8% | +| Direct Bit Banding | 1.470us | 0.250us | 82.9% | + +: Comparing performance of each method and optimization improvements + +Masking and direct bit banding offer measurably slower execution once results are normalized. +Since they are writing to the GPIO interfaces first, +the internal logic of the chip responsible for controlling GPIO is invoked, +adding a runtime penalty. +The function method bypasses this extraneous GPIO logic +-- writing directly to the register -- +and thus offers the best performance. + +All methods receive a large, +yet roughly similar improvement when compiled with optimizations, +which is to be expected. + +# Appendix + +``` +/* bitband.c*/ + +#include "LPC17xx.h" +#include "GLCD.h" + +#include <stdio.h> + +//------- ITM Stimulus Port definitions for printf ------------------- // +#define ITM_Port8(n) (*((volatile unsigned char *)(0xE0000000+4*n))) +#define ITM_Port16(n) (*((volatile unsigned short*)(0xE0000000+4*n))) +#define ITM_Port32(n) (*((volatile unsigned long *)(0xE0000000+4*n))) + +#define DEMCR (*((volatile unsigned long *)(0xE000EDFC))) +#define TRCENA 0x01000000 + +struct __FILE { int handle; }; +FILE __stdout; +FILE __stdin; + +int fputc(int ch, FILE *f) { + if (DEMCR & TRCENA) { + while (ITM_Port32(0) == 0); + ITM_Port8(0) = ch; + } + return(ch); +} +//------------------------------------------------------------------- // + +#define __USE_LCD 0 // Uncomment to use the LCD +#define __FI 1 // Font index 16x24 + +// Bit Band Macros used to calculate the alias address at run time +#define ADDRESS(x) (*((volatile unsigned long *)(x))) +#define BitBand(x, y) ADDRESS(((unsigned long)(x) & 0xF0000000) | 0x02000000 |(((unsigned long)(x) & 0x000FFFFF) << 5) | ((y) << 2)) + +#ifdef __USE_LCD +static inline void method2lcd(unsigned char* msg) { + GLCD_DisplayString(6, 8, __FI, msg); +} +#endif + +// Simple register masking +static void method_mask(){ + LPC_GPIO1->FIOPIN ^= (1 << 28); + LPC_GPIO2->FIOPIN ^= (1 << 2); +} + +// Define pointer with bitband method +static void method_function(){ + volatile unsigned long* bit1 = &BitBand(&LPC_GPIO1->FIOPIN, 29); + volatile unsigned long* bit2 = &BitBand(&LPC_GPIO2->FIOPIN, 3); + + static _Bool state = 1; + + *bit1 = *bit2 = state; + state = !state; +} + +// Raw bitbanding +static void method_bitbanding() { + const size_t addr1 = 0x22000000 + (0x2009C034 * 32UL) + (31 * 4); + const size_t addr2 = 0x22000000 + (0x2009C054 * 32UL) + (4 * 4); + + static _Bool state = 1; + + ADDRESS(addr1) = ADDRESS(addr2) = state; + state = !state; +} + +void SysTick_Handler(void) { + static size_t tick = 0; + static size_t state = 0; + + if (tick++ < 500) { return; } + tick = 0; + + // Uses MOVS instruction to implement jump table + if (state == 0) { method_mask(); state++; } + else if (state == 1) { method_function(); state++; } + else if (state == 2) { method_bitbanding(); state = 0; } + + #ifdef __USE_LCD + if (state == 1) { method2lcd("MASK "); } + else if (state == 2) { method2lcd("FUNCTION"); } + else if (state == 0) { method2lcd("BITBAND "); } + #endif +} + +int main(void){ + LPC_SC->PCONP |= (1 << 15); /* enable power to GPIO & IOCON */ + LPC_GPIO1->FIODIR |= 0xB0000000; /* LEDs on PORT1 are output */ + LPC_GPIO2->FIODIR |= 0x0000007C; /* LEDs on PORT2 are output */ + + // Configure SysTick with interrupt and internal clock source + ADDRESS(0xE000E010) = (1 << 0) | (1 << 1) | (1 << 2); + + // Run handler every 1ms + ADDRESS(0xE000E014) = 99999; + + #ifdef __USE_LCD + GLCD_Init(); /* Initialize graphical LCD (if enabled */ + + GLCD_Clear(White); /* Clear graphical LCD display */ + GLCD_SetBackColor(Blue); + GLCD_SetTextColor(Yellow); + GLCD_DisplayString(0, 0, __FI, " COE718 Lab 2 "); + GLCD_SetTextColor(White); + GLCD_DisplayString(1, 0, __FI, " bitband.c "); + GLCD_DisplayString(2, 0, __FI, " Watch the LEDs! "); + GLCD_SetBackColor(White); + GLCD_SetTextColor(Blue); + GLCD_DisplayString(6, 0, __FI, "Method:"); + #endif + + // Let SysTick callback run in background + while (1) {} +} +``` diff --git a/F2024/coe718/labs/lab2/report/ryeU_logo.png b/F2024/coe718/labs/lab2/report/ryeU_logo.png new file mode 100644 index 0000000..f9a8187 --- /dev/null +++ b/F2024/coe718/labs/lab2/report/ryeU_logo.png Binary files differdiff --git a/F2024/coe718/labs/lab2/report/times.txt b/F2024/coe718/labs/lab2/report/times.txt new file mode 100755 index 0000000..f4920a3 --- /dev/null +++ b/F2024/coe718/labs/lab2/report/times.txt @@ -0,0 +1,4 @@ + -O0 -O3 +Masking: 0.510us 0.120us +Function: 0.180us 0.040us +Bitband: 1.470us 0.250us \ No newline at end of file diff --git a/F2024/coe718/labs/lab2/report/title.aux b/F2024/coe718/labs/lab2/report/title.aux new file mode 100644 index 0000000..23c9134 --- /dev/null +++ b/F2024/coe718/labs/lab2/report/title.aux @@ -0,0 +1,8 @@ +\relax +\providecommand\babel@aux[2]{} +\@nameuse{bbl@beforestart} +\providecommand\hyper@newdestlabel[2]{} +\providecommand\HyField@AuxAddToFields[1]{} +\providecommand\HyField@AuxAddToCoFields[2]{} +\babel@aux{english}{} +\gdef \@abspage@last{1} diff --git a/F2024/coe718/labs/lab2/report/title.log b/F2024/coe718/labs/lab2/report/title.log new file mode 100644 index 0000000..0545480 --- /dev/null +++ b/F2024/coe718/labs/lab2/report/title.log @@ -0,0 +1,399 @@ +This is pdfTeX, Version 3.141592653-2.6-1.40.26 (TeX Live 2024/Arch Linux) (preloaded format=pdflatex 2024.9.19) 25 SEP 2024 09:29 +entering extended mode + restricted \write18 enabled. + %&-line parsing enabled. +**title.tex +(./title.tex +LaTeX2e <2023-11-01> patch level 1 +L3 programming layer <2024-02-20> +(/usr/share/texmf-dist/tex/latex/base/article.cls +Document Class: article 2023/05/17 v1.4n Standard LaTeX document class +(/usr/share/texmf-dist/tex/latex/base/size12.clo +File: size12.clo 2023/05/17 v1.4n Standard LaTeX file (size option) +) +\c@part=\count188 +\c@section=\count189 +\c@subsection=\count190 +\c@subsubsection=\count191 +\c@paragraph=\count192 +\c@subparagraph=\count193 +\c@figure=\count194 +\c@table=\count195 +\abovecaptionskip=\skip48 +\belowcaptionskip=\skip49 +\bibindent=\dimen140 +) +(/usr/share/texmf-dist/tex/generic/babel/babel.sty +Package: babel 2024/02/07 v24.2 The Babel package +\babel@savecnt=\count196 +\U@D=\dimen141 +\l@unhyphenated=\language5 + +(/usr/share/texmf-dist/tex/generic/babel/txtbabel.def) +\bbl@readstream=\read2 +\bbl@dirlevel=\count197 + +(/usr/share/texmf-dist/tex/generic/babel-english/english.ldf +Language: english 2017/06/06 v3.3r English support from the babel system +Package babel Info: Hyphen rules for 'british' set to \l@english +(babel) (\language0). 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a/F2024/coe718/labs/lab2/report/title.tex b/F2024/coe718/labs/lab2/report/title.tex new file mode 100644 index 0000000..d2f83f4 --- /dev/null +++ b/F2024/coe718/labs/lab2/report/title.tex @@ -0,0 +1,85 @@ +\documentclass[a4paper, 12pt]{article} +\usepackage[english]{babel} +\usepackage[top=1in, bottom=1in, left=1.25in, right=1.25in]{geometry} +\usepackage{graphicx} +\usepackage{tabularx, array} +\usepackage{multirow} +\usepackage[colorlinks=true, urlcolor=blue]{hyperref} + +\renewcommand{\arraystretch}{1.5} + +\begin{document} +\begin{titlepage} +\begin{center} +\includegraphics[width=0.4\textwidth]{ryeU_logo.png} \\ +Faculty of Engineering, Architecture and Science + +\vspace{0.5cm} + +\textbf{Department of Electrical and Computer Engineering} + +\vspace{0.5cm} + +\begin{tabularx}{0.8\textwidth} { + | >{\centering\arraybackslash}X + | >{\centering\arraybackslash}X |} +\hline +Course Number & COE 718\\ +\hline +Course Title & Embedded Systems Design\\ +\hline +Semester/Year & F2024\\ +\hline +Instructor & Dr. Gul Khan\\ +\hline +\end{tabularx} + +\vspace{0.5cm} + +\begin{tabularx}{\textwidth} { + | >{\centering\arraybackslash}X + | >{\centering\arraybackslash}X |} +\hline +\textbf{\Large ASSIGNMENT No.} & Lab 2\\ +\hline +Assignment Title & Exploring ARM Cortex M3 Features \\ +\hline +\end{tabularx} + +\vspace{0.5cm} + +\begin{tabularx}{\textwidth} { + | >{\centering\arraybackslash}X + | >{\centering\arraybackslash}X |} +\hline +Submission Date & Tuesday, September 25\\ +\hline +Due Date & Wednesday, September 25\\ +\hline +\end{tabularx} + +\vspace{0.5cm} + +\begin{tabularx}{\textwidth} { + | >{\centering\arraybackslash}X + | >{\centering\arraybackslash}X |} +\hline +Student Name & Kleidi Bujari\\ +\hline +Student ID & 501040047\\ +\hline +\rule{0pt}{4em} + \raisebox{1.5em}{Signature*} & \raisebox{1.5em}{ \it{Kleidi Bujari} }\\ +\hline +\end{tabularx} + +\vspace{0.5cm} + +\begin{minipage}{\textwidth} +*By signing above you attest that you have contributed to this written lab report and confirm that all work you have contributed to this lab report is your own work. Any suspicion of copying or plagiarism in this work will result in an investigation of Academic Misconduct and may result in a â0â on the work, an âFâ in the course, or possibly more severe penalties, as well as a Disciplinary Notice on your academic record under the Student Code of Academic Conduct, which can be found online at: \url{www.ryerson.ca/senate/current/pol60.pdf}. +\end{minipage} +\end{center} +\end{titlepage} +\end{document} + +Collapse |
