Download se3910-3

SE-3910
Real-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 Yoder
Slide 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
system
a.
b.
c.
d.
e.
Hardware only design
Software only design
Designed to run on a general purpose computer
A combination of hardware and software
Always written in C++
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
2
Whole-class Quiz! (2)
• What is the key factor which defines a real
time system versus a non real time system
a.
b.
c.
d.
e.
Fast I/O
Small systems
Meets deadlines
High speed operation
Correct logic
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
3
Whole-class Quiz! (3)
What is the voltage across R2?
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
4
Ohm’s Law
http://www.gtsparkplugs.com/images/Simple_Ohms_Law.jpg
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
5
Upcoming Quiz:Topics
• Prelab video – questions similar to the quiz at
the end of Dr. Schilling’s video
• Practiced
– How to burn up your Beaglebone
• Not yet practiced:
– Beaglebone I/O circuits
– Locating a pin on board
• (will supply necessary figures!)
– Label amplitude, peak-to-peak voltage, pulseSE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
width, etc. on a waveform
& compute Veff
Much Material: Dr. Schilling
6
How to Burn Up Your Beaglebone
… for fun and profit …
• Clean up:
– Plug ground into power
• By using alternate power supply
– Overpower: >5.1 V input
• By using alternate power supply
– Putting power on IO pins before powering
• By using alternate power supply
– Putting 5V into 3.3 V to the expansion headers
• By plugging into the wrong pin
• Even through resistor!
SE-3910 - Dr. Josiah Yoder
– Analog max voltage even lower - 1.8 V
Slide style: Dr. Hornick
Much Material: Dr. Schilling
7
PC
Contains separate
•Microprocessor(s)
•Memory
•Peripheral (I/O)
device HW
• serial port
•
•
•
•
•
•
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
parallel port
USB port
Bluetooth port
IR port
AGP port
WiFi port,…
8
Beaglebone
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
9
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
10
Expansion
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
11
A Cape
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
12
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
13
Finding GPIO Port
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
14
Resistor
Switch
Ground
Battery
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
15
A simple input circuit
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
16
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?
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
17
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
18
ITM QTY REF
PART
1
1
PCB
2
2 P1, P2 2x23 HDR FE
3
1 P3
8 PIN HDR FE
4
2 S1, S2 BUTTONS
5
2 D1, D2 LEDS
6
2 R1, R2 RESISTOR
7
1 BR1
BREADBOARD
8
1
JMPR WIRE KIT
DESCRIPTION
2-LAYER 3.4" x 2.15"
DUAL - STRAIGHT SOCKET STRIP .025" SQ. PINS
CONN HEADER FEMALE 8 POS 0.1" GOLD
SWITCH TACT SPST-NO .05A 24V
LED GREEN 3MM 568NM 20mA 2.12V
RES 470 OHM 1/4W 5% CF MINI
WHT ADHSV SLDRLSS BRDBRD 170 TIE PT 1.8" x 1.37"
10 x 14 LNGTH .1" .2" .3" .4" .5" .6" .7" .8" .9" 1" 2" 3" 4" 5"
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
DISTR PART #
MLE
DK
DK
DK
DK
PLU
SQR
SSHQ-123-D-08-F-LF
PPPC081LFBN-RC
B3F-1000
WP7104SGC
CFM14JT470R
1490
19
Class Example
SE-3910 - Dr. Josiah Yoder
Slide style: Dr. Hornick
Much Material: Dr. Schilling
20