use barcode scanner in asp.net ; Latch in the Data ; Make Sure Proper Delay is In Place in Software

Create QR-Code in Software ; Latch in the Data ; Make Sure Proper Delay is In Place

; Latch in the Data ; Make Sure Proper Delay is In Place
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; Delay 160 usecs
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Painting QR-Code In C#.NET
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; Do the 8 Bit Initialization ; Wait 15 msecs
Encode QR Code 2d Barcode In VS .NET
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Encoding QR-Code In .NET Framework
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; Initialize the I/O Port ; Save the Value ; Clear the Shift Register
QR Code Creation In Visual Basic .NET
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; Shift Out Each Bit ; 5 is the Current MSB ; Shift Out the Next Highest Bit
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Data Matrix Creation In None
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APPENDIX G
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decfsz Dlay, f goto $ - 7 bsf DataPort, DataPin if (Freq > 8000000) if (Freq < 16000000) nop else goto $ + 1 endif endif bcf DataPort, DataPin call Dlay5 bsf DataPort, DataPin if (Freq > 8000000) if (Freq < 16000000) nop else goto $ + 1 endif endif bcf DataPort, DataPin bsf Dlay, Dlay160Bit1 if (Dlay160Bit2 != -1) bsf Dlay, Dlay160Bit2 endif decfsz Dlay, f goto $ - 1 bsf DataPort, DataPin if (Freq > 8000000) if (Freq < 16000000) nop else goto $ + 1 endif endif bcf DataPort, DataPin bsf Dlay, Dlay160Bit1 if (Dlay160Bit2 != -1) bsf Dlay, Dlay160Bit2 endif decfsz Dlay, f goto $ - 1 movlw 0x022 movwf LCDTemp movlw 6 movwf Dlay bsf ClockPort, ClockPin bcf ClockPort, ClockPin
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Encode EAN13 In Objective-C
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; Latch in the Data ; Make Sure Proper Delay is In Place
Decoding Data Matrix 2d Barcode In Visual C#.NET
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Code 128 Code Set B Generator In Objective-C
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; Send another 0x03 to the LCD ; Make Sure Proper Delay is In Place
Bar Code Creation In .NET
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Recognizing GS1 128 In Visual C#
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; Delay 160 usecs
EAN128 Printer In Objective-C
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Encoding Bar Code In Objective-C
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; Send another 0x03 to the LCD ; Make Sure Proper Delay is In Place
; Delay 160 usecs
; Initialize the I/O Port ; Save the Value ; Clear the Shift Register
REUSE, RETURN, AND RECYCLE
decfsz Dlay, f goto $ - 3 movwf Dlay bcf DataPort, DataPin btfsc LCDTemp, 5 bsf DataPort, DataPin bsf ClockPort, ClockPin bcf ClockPort, ClockPin rlf LCDTemp, f decfsz Dlay, f goto $ - 7 bsf DataPort, DataPin if (Freq > 8000000) if (Freq < 16000000) nop else goto $ + 1 endif endif bcf DataPort, DataPin bsf Dlay, Dlay160Bit1 if (Dlay160Bit2 != -1) bsf Dlay, Dlay160Bit2 endif decfsz Dlay, f goto $ - 1 movlw 0x028 call LCDIns movlw 0x010 call LCDIns movlw 0x001 call LCDIns movlw 0x006 call LCDIns movlw 0x00E call LCDIns return endm
; Shift Out Each Bit ; 5 is the Current MSB ; Shift Out the Next Highest Bit
; Latch in the Data ; Make Sure Proper Delay is In Place
; Delay 160
secs
; Set Interface Length ; Turn Off Display ; Clear Display RAM ; Set Cursor Movement ; Turn on Display/Cursor
When you execute the two-wire LCD interface, you will find that it takes up about twice the number of instructions as any of the other methods and takes six or more times to run. Its chief advantage is the requirement for only two I/O pins to operate. I should point out that all these LCD interfaces will work properly with interrupts enabled and processing. If any operations are interrupted, then the timings will be stretched out (which is not a problem). The only issue would be if minimum processing times were interrupted.
APPENDIX G
NRZ SERIAL I/O
Throughout this book I have worked with RS-232 as a method of interfacing to the PIC microcontroller. In this section I want to give you two different ways of creating a bit banging interface using very easy-to-use macros. Using these macros, you should be able to implement an NRZ serial interface in literally minutes for your application. The rst method is a traditional bit banging interface that can be used by both lowend and mid-range PIC microcontrollers that do not have built-in UART (or USART) ports. To set up the serial interfaces, the macro
NRZSerialNI Macro TXPort, TXPin, RXPort, RXPin, Polarity, Rate, Freq
is invoked, where TXPort and TXPin, along with RXPort and RXPin, are used to de ne the transmit port and the receive port, respectively. As I will discuss in the next section, these pairs of pins can be combined into a single de ne to make the de nition easier. The polarity of the signals is de ned as Pos for positive or positive logic and Neg for negative or inverted logic (useful for interfacing to RS-232 directly through a current-limiting resistor). Rate is the data rate (in bits per second), and Freq is the speed the processor is executing at in hertz. For the traditional bit banging interface, the macro can be invoked anywhere in the code, but I recommend doing so at the end of the application for mid-range PIC microcontrollers and at the start of the application, after putting in a jump around the code, in low-end microcontrollers. When the macro is expanded, the bit delay calculations are made, and the bit banging serial receive and transmit subroutines are inserted into the application. The macros can be used by either low-end or mid-range PIC microcontrollers without modi cation. The macro code is
NRZSerialNI Macro TXPort, TXPin, RXPort, RXPin, Polarity, Rate, Frequency variable BitDlay BitDlay = Frequency / (4 * Rate) SerialRX ; Receive 8-N-1 if (Polarity == Pos) btfsc RXPort, RXPin ; Wait for a Bit to Come in else btfss RXPort, RXPin endif goto $ - 1 DlayMacro BitDlay / 2 ; Wait 1/2 a Bit to Con rm
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