Lab46 Wiki

User Tools

Site Tools

You are here: start » haas » fall2020 » common » projects » led1
haas:fall2020:common:projects:led1

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
haas:fall2020:common:projects:led1 [2021/09/05 13:58] – [On your pi] wedgehaas:fall2020:common:projects:led1 [2021/09/05 14:01] (current) – external edit 127.0.0.1
Line 203: Line 203:
 With an expanded set of LED circuits, be sure to test the operation of each one. With an expanded set of LED circuits, be sure to test the operation of each one.
 =====Program===== =====Program=====
-It is your task to write a C program that interfaces successfully with four independently connected LED circuits, arranged in some orientation to ascertain an order or positioning, where your program will (in endless fashion, or until being manually interrupted) display a count (in binary) of values from 0 to 15 (then rollover, or reset).+It is your task to compile, run, expand upon, and understand a program to interface with a set of LEDs (light emitting diodes), a nice software-hardware connection, on your raspberry pi.
  
-If "1" means the LED in that position is ON, and "0" means the LED in that position is OFF, then you want to write a program that performs the following progression (over and over again):+The program files provided for this project are, while not complete, minimally functional. You merely have to get it on your pi, compile it, and run it, and expand it with the appropriate circuitry hooked up to the specified places. You will want to make sure you UNDERSTAND what is going on. So be sure to ASK QUESTIONS, and do so EARLY enough so that you aren't in a mad dash to make the deadline.
  
-<code> +In future projects you will start implementing more logic to attain further functionality.
-0 0 0 0 +
-0 0 0 1 +
-0 0 1 0 +
-0 0 1 1 +
-0 1 0 0 +
-0 1 0 1 +
-0 1 1 0 +
-0 1 1 1 +
-1 0 0 0 +
-1 0 0 1 +
-1 0 1 0 +
-1 0 1 1 +
-1 1 0 0 +
-1 1 0 1 +
-1 1 1 0 +
-1 1 1 1   <-- 15, the maximum value to display +
-0 0 0 0   <-- 0, we "roll over" and start again +
-0 0 0 1 +
-0 0 1 0 +
-... +
-</code> +
- +
-The program files provided for this project are, while not complete, a good base to start from. Be sure to ASK QUESTIONS, and do so EARLY enough so that you aren't in a mad dash to make the deadline. +
- +
-=====Bitwise logic===== +
-Since the off/on state of each LED is essentially binary in nature (or one bit of an overall sequence), why not utilize the powerful bitwise tools available to us in C? +
- +
-====bitwise-AND==== +
-C provides a bitwise AND operator, the **<nowiki>&</nowiki>** symbol, which can be used in equations to perform bitwise-AND operations: +
- +
-<code c> +
-char value  = 5;         // 00000101 in binary +
-value       = value & 6; //   00000101 +
-                         // & 00000110 +
-                         //   ======== +
-                         //   00000100 +
-</code> +
- +
-Remember the truth table for the AND: +
- +
-<code> +
-( AND ) +
-A B | X +
-====+=== +
-F F | F +
-F T | F +
-T F | F +
-T T | T +
-</code> +
- +
-Think of how this property could be used in combination with other concepts we've learned about in C to solve the problem at hand. +
- +
-====bitwise-iOR==== +
-C provides a bitwise inclusive OR operator, the **<nowiki>|</nowiki>** symbol, which can be used in equations to perform bitwise-iOR operations: +
- +
-<code c> +
-char value  = 5;         // 00000101 in binary +
-value       = value | 6; //   00000101 +
-                         // & 00000110 +
-                         //   ======== +
-                         //   00000111 +
-</code> +
- +
-Remember the truth table for the iOR: +
- +
-<code> +
-( iOR ) +
-A B | X +
-====+=== +
-F F | F +
-F T | T +
-T F | T +
-T T | T +
-</code> +
- +
-Think of how this property could be used in combination with other concepts we've learned about in C to solve the problem at hand. +
- +
-====bitwise-xOR==== +
-C provides a bitwise exclusive OR operator, the **<nowiki>^</nowiki>** symbol, which can be used in equations to perform bitwise-xOR operations: +
- +
-<code c> +
-char value  = 5;         // 00000101 in binary +
-value       = value ^ 6; //   00000101 +
-                         // & 00000110 +
-                         //   ======== +
-                         //   00000011 +
-</code> +
- +
-Remember the truth table for the xOR: +
- +
-<code> +
-( xOR ) +
-A B | X +
-====+=== +
-F F | F +
-F T | T +
-T F | T +
-T T | F +
-</code>+
  
-Think of how this property could be used in combination with other concepts we've learned about in C to solve the problem at hand. 
 ====Grabbing project resources (on lab46)==== ====Grabbing project resources (on lab46)====
 I have prepared a **grabit** for resources related to this project. To obtain: I have prepared a **grabit** for resources related to this project. To obtain:
Line 333: Line 233:
  
 ====On your pi==== ====On your pi====
-Implement the needed program on your pi in conjunction with testing and verifying operation of your properly hooked-up electronics circuit. When done, submit it on lab46.+Study and run this program on your pi in conjunction with testing and verifying operation of your properly hooked up electronics circuit. When done, submit it on lab46.
  
 To utilize the needed functionality for this project, you will need to ensure you have the following packages installed: To utilize the needed functionality for this project, you will need to ensure you have the following packages installed:
Line 414: Line 314:
   * Solutions not utilizing indentation to promote scope and clarity will be subject to a 25% overall deduction   * Solutions not utilizing indentation to promote scope and clarity will be subject to a 25% overall deduction
   * Solutions not organized and easy to read are subject to a 25% overall deduction   * Solutions not organized and easy to read are subject to a 25% overall deduction
 +
haas/fall2020/common/projects/led1.1630850314.txt.gz · Last modified: 2021/09/05 13:58 by wedge

Page Tools

Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Share Alike 4.0 International
CC Attribution-Share Alike 4.0 International Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki