Introduction to Wireless Sensor Networks Tiny OS Overview

Organizational Class Website www. engineering. uiowa. edu/~ece 195/2005/ Class Time Monday 4: 30 -5:

Think Back – Mote Subsystems The University of Iowa. Copyright© 2005 3 A. Kruger

MCU Components Flash RAM Power Management I/O ALU The University of Iowa. Copyright© 2005

Memory registers Flash RAM scratch stack The University of Iowa. Copyright© 2005 5 A.

Compile-Link Cycle • Compilation - translate high-level language to assembly language LOOP: MOV AX,

Linking Our code 00101001 01000101 11100101 10001001 … Image LJMP _printf Libraries 00101011 01000111

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

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

Tiny. OS Tutorial • Website: – http: //www. tinyos. net/tinyos 1. x/doc/tutorial/lesson 1. html

Tiny. OS Tutorial • Concept concurrency model – Executes only one program – Two

Application: Blink Think of as “bind to”. The left side binds an interface to

Homework • Tiny OS Tutorial –http: //www. tinyos. net/tinyos 1. x/doc/tutorial/lesson 1. html •

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Organizational Class Website www. engineering. uiowa. edu/~ece 195/2005/ Class Time Monday 4: 30 -5: 20 Room 4511 SC Thursday 12: 30 -1: 20 Room 3220 SC Please note that the room numbers are different for Mondays and Thursdays. Office Hours Monday 5: 20 -6: 20 Room 1126 SC Thursday 1: 30 -2: 30 Room 1126 SC Other By appointment Room 523 C SHL The University of Iowa. Copyright© 2005 2 A. Kruger

Compile-Link Cycle • Compilation - translate high-level language to assembly language LOOP: MOV AX, 0 x 02 LJMP _printf DEC AX JNZ LOOP for (i=0; i<=2 -1; i++) printf(“%dn”, i); • Assembly – translate assembler into machine language LOOP: MOV AX, 0 x 02 LJMP _printf DEC AX JNZ LOOP The University of Iowa. Copyright© 2005 00101001 01000101 LJMP _printf 11100101 10001001 … 6 A. Kruger

Linking Our code 00101001 01000101 11100101 10001001 … Image LJMP _printf Libraries 00101011 01000111 11100101 10101001 … Linker 00101001 01000101 11100101 10001001 … 00101011 01000111 11100101 10101001 … _printf OS services 00101011 01000111 11100101 10101001 The University of Iowa. Copyright© 2005 7 A. Kruger

Tiny. OS Tutorial • Website: – http: //www. tinyos. net/tinyos 1. x/doc/tutorial/lesson 1. html • Concept: nes. C – OS, Libraries, and Applications are written in nes. C – C-like language – Compiler: ncc • Concept: components The University of Iowa. Copyright© 2005 10 A. Kruger

Tiny. OS 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 • nes. C code are susceptible to race conditions The University of Iowa. Copyright© 2005 11 A. Kruger

Application: Blink Think of as “bind to”. The left side binds an interface to an configuration Blink { implementation on the right } implementation { components Main, Blink. M, Single. Timer, Leds. C; Main. Std. Control -> Blink. M. Std. Control; Main. Std. Control -> Single. Timer. Std. Control; Blink. M. Timer -> Single. Timer; Blink. M. Leds -> Leds. C; } Components that uses interface The University of Iowa. Copyright© 2005 Components that provides interface 12 A. Kruger

Homework • Tiny OS Tutorial –http: //www. tinyos. net/tinyos 1. x/doc/tutorial/lesson 1. html • Monday – Demo in Sensors Lab in IIHR WTA – http: //www. uiowa. edu/~maps/h/hwta 1. htm – Will post signs The University of Iowa. Copyright© 2005 13 A. Kruger