se-3910 real-time systems week 3, class 1 – beaglebone documentation (cont.) – review/basic...

SE-3910Real-time Systems

• Week 3, Class 1– Beaglebone Documentation (cont.)– Review/Basic Circuits (cont.)

• Switches & Pull-up resistors• How to burn up your Beaglebone

– Review coding in C – UML diagrams (perhaps)

• Quiz Tomrrow at start of Lab 3– See later slide

SE-3910 - Dr. Josiah YoderSlide style: Dr. Hornick

Much Material: Dr. Schilling, Some from Dr. Hornick, etc.1

Whole-class Quiz! (1)

• What is the key item which defines an embedded system versus a non-embedded systema. Hardware only designb. Software only designc. Designed to run on a general purpose computerd. A combination of hardware and softwaree. Always written in C++


Much Material: Dr. Schilling2

Whole-class Quiz! (2)

• What is the key factor which defines a real time system versus a non real time systema. Fast I/Ob. Small systemsc. Meets deadlinesd. High speed operatione. Correct logic



Whole-class Quiz! (3)What is the voltage across R2?



Ohm’s Law



http://www.gtsparkplugs.com/images/Simple_Ohms_Law.jpg

Upcoming Quiz:Topics

• Prelab video – questions similar to the quiz at the end of Dr. Schilling’s video

• How to burn up your Beaglebone• Beaglebone I/O circuits• Locating a pin on board

– (will supply necessary figures!)

• Label amplitude, peak-to-peak voltage, pulse-width, etc. on a waveform & compute Veff



How to Burn Up Your Beaglebone… for fun and profit …• Plug ground into power• Throw at wall• Underpower? (Hmmmm…)• Overpower?• Get wet• Putting power on IO pins before powering • Putting 5V into to the expansion headers

– 3.3 V

• Analog max voltage even lower• Don’t ground an output



PC



Contains separate•Microprocessor(s)•Memory•Peripheral (I/O) device HW

• serial port• parallel port• USB port• Bluetooth port• IR port• AGP port• WiFi port,…

Beaglebone



Expansion



A Cape



Finding GPIO Port





Resistor

Switch

Ground

Battery

A simple input circuit



Power of a signal (If time)

• P = IV• I = V/R• P = …• Let R = 1 (Ohm)• What is the instantaneous power of a

sinusoid?• What is the average power of a sinusoid?• What is the average power of a PWM signal?





ITM QTY REF PART DESCRIPTION DISTR PART #1 1 PCB 2-LAYER 3.4" x 2.15" 2 2 P1, P2 2x23 HDR FE DUAL - STRAIGHT SOCKET STRIP .025" SQ. PINS MLE SSHQ-123-D-08-F-LF3 1 P3 8 PIN HDR FE CONN HEADER FEMALE 8 POS 0.1" GOLD DK PPPC081LFBN-RC4 2 S1, S2 BUTTONS SWITCH TACT SPST-NO .05A 24V DK B3F-10005 2 D1, D2 LEDS LED GREEN 3MM 568NM 20mA 2.12V DK WP7104SGC6 2 R1, R2 RESISTOR RES 470 OHM 1/4W 5% CF MINI DK CFM14JT470R7 1 BR1 BREADBOARD WHT ADHSV SLDRLSS BRDBRD 170 TIE PT 1.8" x 1.37" PLU 14908 1 JMPR WIRE KIT 10 x 14 LNGTH .1" .2" .3" .4" .5" .6" .7" .8" .9" 1" 2" 3" 4" 5" SQR

Class Example



se-3910 real-time systems week 3, class 1 – beaglebone documentation (cont.) – review/basic...

Documents

josiah yoderslide style

hornickmuch material

schillingwholeclass

schillingupcoming quiz

peak voltage

io pins

beaglebone documentation

vanalog max voltage