barcode scanner sdk vb.net Figure 17-3 Setup for reading a fixed frequency in Software

Painting Denso QR Bar Code in Software Figure 17-3 Setup for reading a fixed frequency

Figure 17-3 Setup for reading a fixed frequency
QR Code Reader In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
QR Code 2d Barcode Creation In None
Using Barcode maker for Software Control to generate, create QR Code image in Software applications.
reading FrequenCies
QR-Code Reader In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
Draw QR Code JIS X 0510 In C#
Using Barcode maker for .NET framework Control to generate, create QR image in VS .NET applications.
Figure 17-4 Schematic of how cycle time components are identified Program 17-4 Reading a Generated Frequency
Encoding QR Code JIS X 0510 In VS .NET
Using Barcode creation for ASP.NET Control to generate, create QR Code JIS X 0510 image in ASP.NET applications.
QR Code Printer In Visual Studio .NET
Using Barcode drawer for VS .NET Control to generate, create QR Code JIS X 0510 image in .NET framework applications.
{{05 Oct 09 Harprit Sandhu FreqCounter.Spin Propeller Tool Ver 1.2.6 The program reads the frequency of a signal on the Input line and displays it on the LCD. The signal is read as the number of waves in 1 second. Three Cogs are used COG GO reads the frequency COG COG_LCD displays values on LCD COG FREQ_GEN generates the frequency }} CON _CLKMODE=XTAL1+ PLL2X _XINFREQ = 5_000_000 input =26 output =27 VAR long long long long long long
Print QR Code In VB.NET
Using Barcode printer for VS .NET Control to generate, create QR Code JIS X 0510 image in .NET applications.
Draw EAN-13 In None
Using Barcode generator for Software Control to generate, create EAN13 image in Software applications.
'The system clock spec 'crystal 'line for input for what is to be read 'line for output of what is generated 'these are the variables 'For CogOne 'For freq_gen 'read frequency
Code 128 Code Set A Printer In None
Using Barcode generator for Software Control to generate, create Code 128 Code Set C image in Software applications.
Making DataMatrix In None
Using Barcode creator for Software Control to generate, create DataMatrix image in Software applications.
Stack[50] Stack1[50] Frequency startTMRi StopTMR elapsed
UCC - 12 Creator In None
Using Barcode printer for Software Control to generate, create UCC - 12 image in Software applications.
UPC A Printer In None
Using Barcode drawer for Software Control to generate, create Universal Product Code version A image in Software applications.
OBJ LCD : "LCDRoutines4" UTIL : "Utilities"
International Standard Book Number Drawer In None
Using Barcode creation for Software Control to generate, create ISBN - 13 image in Software applications.
Bar Code Encoder In C#.NET
Using Barcode drawer for .NET Control to generate, create barcode image in .NET applications.
'These are the methods we will need 'for controlling the LCD 'for general methods (continued)
Encoding Barcode In Java
Using Barcode creation for Java Control to generate, create bar code image in Java applications.
Make GS1 - 13 In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create GTIN - 13 image in ASP.NET applications.
Creating and reading FrequenCies
Painting UCC - 12 In C#
Using Barcode drawer for VS .NET Control to generate, create UPC Code image in VS .NET applications.
EAN13 Creation In Visual Basic .NET
Using Barcode maker for .NET framework Control to generate, create EAN 13 image in .NET applications.
Program 17-4
Painting Code 39 In Objective-C
Using Barcode creator for iPad Control to generate, create Code39 image in iPad applications.
Bar Code Encoder In VB.NET
Using Barcode drawer for .NET framework Control to generate, create barcode image in .NET framework applications.
Reading a Generated Frequency (continued)
PUB GO 'This is the main method in this program Cognew (COG_LCD, @Stack) 'create Cog_TWO Cognew (FREQ_GEN, @Stack1) 'create freq generator dira[input]~ repeat repeat while ina[input]==0 'hold at low startTMR:=cnt 'start timer repeat while ina[input]==1 'hold at high repeat while ina[input]==0 'hold at low stopTMR:=cnt 'read timer elapsed:=stopTMR-startTMR frequency:=10_000_000/elapsed PRI COG_LCD LCD.INITIALIZE_LCD REPEAT LCD.POSITION (1,1) LCD.PRINT(STRING("FRQ=")) LCD.PRINT_DEC(Frequency) LCD.SPACE(2) PRI FREQ_GEN dira[output]~~ repeat outa[output]~~ waitcnt(clkfreq/5000+cnt) outa[output]~ waitcnt(clkfreq/5000+cnt) 'This is the display, the LCD 'initialize up the LCD 'Routine to write to the LCD ' 'Frequency 'print freq 'erase old data
'change the 5000 to change freq 'change the 5000 to change freq
Program 17-4 first waits at a low signal and then waits for a rising edge. As soon as the rising edge is detected, the system counter is read and the program starts looking for the signal to go back to a low condition. It then waits for the next rising edge. As soon as the next rising edge is detected, one full wave has gone by, the counter is read again, and the frequency is calculated by dividing the clock frequency by the counts between rising edges. The answer is displayed on the LCD. The frequency that we are reading is being generated in the freq_gen method. We can change the value (5000) in the two waitcnt lines to change the frequency being generated. Things could be made a little more interesting by reading a potentiometer and making the frequency a function of the potentiometer reading.
Reading and CReating Pulses
Reading Pulse Widths
We are going to investigate the electronic signals generated by a Memsic 2125 accelerometer (as provided by Parallax). This device provides electrical information on two lines that represent the horizontal error/tilt of the sensor in the X and Y directions. That is all I want to say at this time to keep all avenues of investigation open, meaning that we will assume that that is all we know about the sensor as we start our investigation. Let s see what we can find out about the device. This sensor will be used again in 27 on the self-leveling table. When we are working with microprocessors, the information of interest to us is often expressed as a series of varying pulse widths. We need to develop the expertise to read these pulse widths. How we read a pulse width depends on how long the pulse width is. There is a limit on how short a pulse width we can read with any microprocessor based on the speed of the processor and the instruction set available to respond to pulses. There is also a kind of a limit on how long a pulse we can read because long pulses may tax our patience, and other devices are better at measuring long intervals than microprocessors. Let s agree that for our purposes anything over 0.25 seconds is a long time. (As a matter of fact, that s a really long time when talking about microprocessors.) In that we are working in a parallel-processing environment, we can assign one of the cogs to determine how long the pulse width is. Once the width has been determined, it is placed in the shared memory so that all cogs that need to know what the pulse width is can get the information from this one location. If there is a need to know when the information was last refreshed, a flag can be set and cleared when the information is set and read, respectively. One flag will be required for each cog that is going to read the information if it is critical that all the cogs read the information before it is updated.
Copyright © OnBarcode.com . All rights reserved.