Announcements Outline for Today - Welcome to ECSE · 2016-09-14 · Lecture #3 September 1, 2016 9/1/2016 Lecture #3 2 Announcements Homework #2 (due before class) –submit file

Lecture #3 September 1, 2016

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AnnouncementsHomework #2 (due before class) – submit file on LMS. Submit a soft copy using LMS, everybody individually. Log onto the course LMS site

• Online Assignments• Homework 2• Upload your corrected HW2-vn.c file• Submit – Important to remember to do this.

Everybody must submit their own work.Add the provided pseudo-code for Lab 1-1 to your notebook, corrected for 1 team member's version of labQuiz 1 – in 2 classes (Mon Sept 15, sections 1,2; Tue Sept 13,sections 3,4) 40 minutes; Open book (printed manual), open printed notes No web pages, no past quizzes, no sharing, calculators allowed Coverage: number conversion, logic, pseudocode, and wiring Make sure you are registered for the correct section

Homework #3 on website: Online assessment – 30 min time limitREMINDER: No food or (container without lid) drink in the lab!

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Outline for Today

Procedures of Tools and Hardware: if you don’t have a toolbox from Elect Ccts or Elect Instrumentation you will need to purchase one for your team ($25)Hardware for switches and LEDS Switches are inputs, LEDs are used for Output

Worksheet #3Lab 1, part 1

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Teaching Assistants

Introduce Grading TAs Side A (podium left)

• Yogish Didgi Side B (podium right)

• Yogish Didgi

Introduce Helping TAs• Jeremy Ang•

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Lab Equipment & ProceduresYou will need to check out one logic probe per team each day of lab. Logic probes are located in a cabinet in the back right

corner of the room (as entering the main door). A TA will need to unlock the cabinet and hold your ID.

Students need to be responsible when using the equipment. If something is missing or not working, please let the TA or Instructor know. We will replace it.

Make sure logic probes are replaced at the end of class.


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Lab Equipment & ProceduresWire for your project can be found in the spare wire box and on the spools Please use the spare wire in the box before using

new wire from the spoolsLess cutting, less waste, less costRemember: red wires for 5V pwr, black wires for 0V gnd

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Lab Equipment & ProceduresEach group will be assigned protoboards A team MUST put their names on the bottom of it (get new label sticker if

needed)

At end of lab, return it to the corresponding numbered location in cabinets – REMEMBER THIS NUMBER Write the number of your protoboard on the inside cover of your lab notebook

Cabinets located on each side of the lab (in back)Unless told otherwise, keep the circuit on the protoboard when you store your equipment at the end of class

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Lab Equipment & ProceduresEach group will be assigned a bag of chips and components.These should be left with the protoboard - not taken home (so you won’t damage parts or forget to bring it to class).

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Lab Equipment & ProceduresNot all components are in your bagLEDs, resistors, and some other components can be found in the trays on the center table


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Lab Equipment & ProceduresClean up your station before leaving lab! Don’t just wipe wires onto floor!

Turn off power on car.Remember: no food or drink allowed in lab!

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Preparing for HardwareTake a few minutes and perform the following tasks (TAs will hand them out): If no one on the team owns a toolbox from Elect Ccts or Elect Instr

then 1 member will need to sign up to purchase one ($25) One student – get a protoboard and logic probe Partner – get a bag of parts and label Mount label on bottom of protoboard and write names, section # &

side, and semester on label Understand the protoboard nodes (see LITEC Manual, end of Ch.

2) Mount the protoboard on the car Connect the ribbon cable to the protoboard

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Lab Equipment & ProceduresAll partners should have a copy of your code Make sure all have a copy at end of each day

• One partner may be late/sick/gone next class Homework needs to be submitted on LMS

If equipment is broken, inform a TA so it can get replaced or repaired Please be careful, only limited supplies and

some equipment is custom built

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Wiring RulesPower/Ground and color convention All connections to power (+5V) use red wire All connections to ground use black wire Do not use red or black wires for any other

connectionsNo wires over chips Wire around them

Use tight wiring Easier to debug

Trim leads of resistors & LEDs


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Help ProceduresTAs there to help youBe aware there are onlyfour or five TAs in the room with up to 70 students We are limited

Try to use the resources available & trouble-shoot on your own first, then ask a TA if you cannot solve the problemIf TAs and professor are busy, please wait patiently

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Help ProceduresThere are also Open Shop hours posted in the lab and on-line The schedule is posted on the pillar in the center of the room TAs will be in the lab at those times to help if necessary

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Lab 1-1 OverviewLab 1 focuses on the hardware and the functions used to interface the hardware to the C8051Lab 1-1 specifically introduces the use of digital inputs and outputs Acquire digital input from external source Use this to determine a digital output

It is important to develop reusable code Use of functions in your programming

GOAL: Control 2 LEDs and a buzzer with two switches

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Common Digital GatesInverter

Buffer

(logic level unchanged, voltage level may change & current increased)

OR

X Q

7404

X Q 0 1 1 0

X Q

740774365

X Q 0 0 1 1

X Y Q 0 0 0 0 1 1 1 0 1 1 1 1

X

YQ

7432


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Common Digital GatesAND

NAND

There are many, many other digital circuits, but these are the common ones we will use.

X

YQ

7400

X Y Q 0 0 1 0 1 1 1 0 1 1 1 0

X

YQ

7408

X Y Q 0 0 0 0 1 0 1 0 0 1 1 1

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Hardware ComponentsRefer to the components when discussing the following slides Buffer chips LEDs Pushbuttons Slide switches

Note: voltage inputs/outputs corresponding to ‘On/Off’ are not necessarily ‘0/5 [V]’ Circuit examples

20Lecture #3

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Chip NumberingOn the physical chip, the pin numbers are arranged from the top-left around the chip in a counter-clockwise (CCW) direction.The top-left is found by locating the small dot or notch on the chip.

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Resistors & Potentiometers

Example of a resistor component:

Resistance value is indicated by the colored bars.Resistor color codes can be found in Appendix C of the lab manual and on the poster on center column in the lab.

Physical appearance Electrical symbol


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Light-Emitting DiodesLEDs are common components that provide a visible indication of a digital output.Diodes only allow current to flow through in one direction. From the cathode to the anode Must be a potential drop across it to emit light

Current (i)249/1/2016 Lecture #3

Application in CircuitConnect an LED and resistor in series Choose resistor to limit current in LED to rated value

• i<=10 mA Can use an output pin on microcontroller to turn on/off

Current (i)

Power+5V

Ground0V

Power+5V

Logic High – no current flowLogic Low – current flow

Use buffer gate to protect microcontroller(acts as a current sink)

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Switches

Different types of switches can provide digital input to the microprocessor. Pushbuttons provide different status only

when pressed. Slide switches can be placed in either status.

common

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Application in CircuitConnect a switch and resistor in series Resistor limits current and provides a voltage drop When open circuit, no current flow, no voltage drop

across resistor, therefore reading +5V at point A When closed circuit, current flows, voltage drops

across resistor, therefore reading 0V at point A Microcontroller can read the status at this point

Current (i)only when pressed

Power+5V

Ground0V

A - Voltage at this point w.r.t. ground is:High when not pressed (no current)Low when pressed


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Worksheets #3 and #4To prepare for Lab 1, we will begin with an example Port initialization and hardware circuit. Worksheet #3 uses hardware similar to Lab 1, part 1, but without the microprocessor control.One switch activates an LED and one activates a buzzer.This circuit can be used as the basis circuitry for Lab 1 (note the similarities). Use proper wiring conventions (neatness, wire color) Don’t disassemble it when finished!

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Hardware Wiring and TestingAdditional items in open supply in the Parts Drawers on the table in the middle of the room. Wire, Resistors Some special items like LEDs

Read the schematic for Worksheet #03.Plan the circuit layout on the protoboard.Connect wires and check. Remember to connect power and ground to the chip.

Turn on power.Verify correct function.Debug if necessary with logic probe.Enter procedure and results in Lab NotebookShow TA the result.Save your work for Lab 1, part 1.Lecture restarts in 30 minutes

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Lab 1, part 1 ObjectivesYour program for Lab 1, part 1 should (or some variation of): When the Slide switch is ‘off’ (input is a HIGH voltage), LED0 is

on, all other output devices are off When the Slide switch is ‘on’ and both Pushbuttons are pushed,

the Buzzer is turned on When the Slide switch is ‘on’ and only Pushbutton 1 is pushed,

the BiLED is green When the Slide switch is ‘on’ and only Pushbutton 2 is pushed,

the BiLED is red print LED and buzzer status to the screen Print button and switch states to the SecureCRT window

See Tutorials website for helpful info.309/1/2016 Lecture #3

Lab 1, part 1 Representation

C8051 Controller

Port 2 & 3

Switches (pushbutton, slide switch)Input

C code

Port 3Output

LED0 BicolorLEDbuzzer


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Lab 1, part 1 Schematic

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Inputs

Why do we need inputs? We want to send some type of information to

the system.What type of signals can we send? Digital (True/False, 1/0, High/Low, +5V/0V)

High for the C8051 microcontroller is ~3V, while logic gates need ~5V

Analog (variable voltage)

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Creating Digital InputsThe Goal: Communicate information to the microcontroller.The Approach: Force an input line to a TRUE or FALSE condition.Recommended practice: Make the input line either high or low at all times — do not let input lines float. Floating lines create the possibility of ambiguous

information at best, and undesirable information at worst.

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Creating Digital Inputs

The usual implementation:

R

Vcc

To input pin


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C Program for Lab 1, part 1Look on LMS Course material, Laboratory 1 for the lab1-1.c starting code. This code is incomplete in many ways

As we look over this example now, think of these questions: How can this be applied in this project? What modifications and additions need to be

made to meet our goals? Your pseudo-code should reflect these

considerations499/1/2016 Lecture #3

Sample CodeLets refer to the Sample code provided with Laboratory1-1. This code will control one LED with one switch You need to modify this code to control 2 LEDs and a

buzzer with two switches (as described previously) Things to note as a review of C programming

• Include header files – we need to include c8051_SDCC.h (website)

• Function prototypes – note what is returned/passed• Variable declarations – must declare at beginning of function• Use of indentation & brackets – proper use is very helpful• Function calls – need () for functions, not variables

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Lab Check-OffWhen you complete a lab assignment, you will need to demonstrate your lab to a TACheck-off procedure TAs/Prof from any section may check you off All partners should to be present (no credit if missing) Lab Notebook needs to be completed to that point You will be asked questions from the Demonstration

and Verification section at end of lab as well as some additional questions

All partners need to know lab well• Questions will be directed towards each partner individually

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Lab Notebooks

Don’t forget to keep your lab notebooks up-to-date! Details in Lab Manual Appendix B Part of lab check-off procedure


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Good Communication

Inform TAs of any partner changes over next week. After that, you will remain partners for rest of semesterYou will receive email updates from your grading TA Be sure to check your email

Thank you for your help in making this course run smoothly

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Connections to the Microcontroller

Each protoboard has an EVB Port Connector, see back cover of lab manual and pin sheetFor example, hardware connects to Port 3 by using pins 31-38.Review the numbering scheme on the protoboard connector block to EVB. Note the location of pins 1 and 2 to see how

they are sequenced.

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Additional Hardware Notes

Note: LEDs will only turn on for forward current flow. Reverse connections if they do not light. See lab manual. The same applies to the polarized buzzer (look for +).Slide protoboards into the slots on top of the car above EVB. This will ensure proper connection of the ribbon cable. Brown edge of cable should be at “low

number” end of pin connector.589/1/2016 Lecture #3

Next ClassHomework 3 is due before classC8051 SFRs & Port I/OContinue Lab 1, part 1

Before you leave Return your protoboard to cabinet slot that matches

number on protoboard. Parts bags should be left with protoboard. Return your toolbox (with everything put back) to the

TA by the back cabinet. Turn off your car.

Documents

Announcements Outline for Today - Welcome to ECSE · 2016-09-14 · Lecture #3 September 1, 2016 9/1/2016 Lecture #3 2 Announcements Homework #2 (due before class) –submit file