Introduction to Wireless Sensor Networks

Introduction to Wireless Sensor Networks TinyOS Overview 10 February 2005

Organizational Class Website www.engineering.uiowa.edu/~ece195/2005/ Class Time Office Hours

Think Back – Mote Subsystems

Flash RAM Power Management I/O ALU MCU Components

Memory Flash registers RAM scratch stack

Compile-Link Cycle • Compilation - translate high-level language to assembly language • Assembly – translate assembler into machine language • LOOP: • MOV AX,0x02 • LJMP _printf • DEC AX • JNZ LOOP for (i=0;i<=2-1;i++) printf(“%d\n”,i); • LOOP: • MOV AX,0x02 • LJMP _printf • DEC AX • JNZ LOOP • 00101001 • 01000101 • 11100101 • 10001001 • … LJMP _printf

Linking Our code • 00101001 • 01000101 • 11100101 • 10001001 • … Image LJMP _printf • 00101001 • 01000101 • 11100101 • 10001001 • … • 00101011 • 01000111 • 11100101 • 10101001 • … Libraries Linker • 00101011 • 01000111 • 11100101 • 10101001 • … _printf OS services • 00101011 • 01000111 • 11100101 • 10101001

Compile Write Code (editor) Program Mote Assemble (programmer, ISP, serial, etc.) Link Test Modify Code Program Development Cycle

Programming Mote • Downloading binary image into device • Connect to programmer • Run programming software

TinyOS Tutorial • Website: • http://www.tinyos.net/tinyos-1.x/doc/tutorial/lesson1.html • Concept: nesC • OS, Libraries, and Applications are written in nesC • C-like language • Compiler: ncc • Concept: components

TinyOS Tutorial • Concept concurrency model • Executes only one program • Two threads • Tasks • Hardware event handlers • Task • Functions. Once scheduled, runs to completion. No preemption. • Hardware event handlers • Run to completion, may preempt execution of functions or other event handlers • async keyword • nesC code are susceptible to race conditions

Think of as “bind to”. The left side binds an interface to an implementation on the right Components that uses interface Components that provides interface Application: Blink configuration Blink {}implementation { components Main, BlinkM, SingleTimer, LedsC; Main.StdControl -> BlinkM.StdControl; Main.StdControl -> SingleTimer.StdControl; BlinkM.Timer -> SingleTimer.Timer; BlinkM.Leds -> LedsC;}

Homework • Tiny OS Tutorial • Monday • Demo in Sensors Lab in IIHR WTA • http://www.uiowa.edu/~maps/h/hwta1.htm • Will post signs • http://www.tinyos.net/tinyos-1.x/doc/tutorial/lesson1.html

Introduction to Wireless Sensor Networks