barcode reader asp.net web application PIC MICROCONTROLLER APPLICATION BASICS in Software

Generator QR in Software PIC MICROCONTROLLER APPLICATION BASICS

PIC MICROCONTROLLER APPLICATION BASICS
Scan Denso QR Bar Code In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
QR Code ISO/IEC18004 Drawer In None
Using Barcode drawer for Software Control to generate, create QR Code image in Software applications.
TMRDlay = 4000000 / (1200 * 3 * 4) TMRDlay = TMRDlay - 8 PreScalerDlay = 0 PreScaler = 2 TMRReset = TMRDlay / PreScaler TMRActual = TMRReset * PreScaler TMRError = ((TMRDlay - TMRActual) * 100) / TMRDlay RTCActual = TMRActual + 9 RTCActual = ((RTCActual * 100000) / (4000000 / 4)) * 10 goto org Int: movwf movf movwf bcf movlw movwf movf btfsc goto movlw addwf btfss goto bsf byte bsf rrf movf andlw btfsc iorlw movwf goto Mainline 4 ; _w STATUS, w _status INTCON, T0IF 256 - TMRReset TMR0 TXCount, f STATUS, Z _DoRX 0x004 TXCount, f STATUS, DC _TXSendDlayCheck TXCount, 2 ; ; PIC microcontroller Interrupt Handler Save the Context Registers ; Jump Past the Interrupt Handler
Reading Quick Response Code In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
QR Code 2d Barcode Creation In Visual C#.NET
Using Barcode creator for VS .NET Control to generate, create QR Code ISO/IEC18004 image in Visual Studio .NET applications.
Reset the Timer Over ow Interrupt Reset the Timer
Encoding QR-Code In Visual Studio .NET
Using Barcode maker for ASP.NET Control to generate, create QR image in ASP.NET applications.
QR Code 2d Barcode Creation In .NET
Using Barcode creation for .NET Control to generate, create QR image in .NET framework applications.
If Transmitting, Can t Receive
Painting QR Code In Visual Basic .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create QR Code ISO/IEC18004 image in .NET applications.
EAN / UCC - 13 Creator In None
Using Barcode generation for Software Control to generate, create EAN / UCC - 14 image in Software applications.
Interrupt Transmit Increment Value Send the Next Byte
Barcode Drawer In None
Using Barcode generator for Software Control to generate, create barcode image in Software applications.
Encoding Data Matrix 2d Barcode In None
Using Barcode creation for Software Control to generate, create Data Matrix ECC200 image in Software applications.
Want to Increment 3x not Four for each
Paint Code 128 In None
Using Barcode creator for Software Control to generate, create Code 128A image in Software applications.
Code 39 Full ASCII Drawer In None
Using Barcode drawer for Software Control to generate, create USS Code 39 image in Software applications.
STATUS, C TXByte, f PORTB, w 0x0FF ^ (1 << 4) STATUS, C 1 << 4 PORTB _IntEnd ; Send Next Bit
Paint USPS Confirm Service Barcode In None
Using Barcode generation for Software Control to generate, create USPS PLANET Barcode image in Software applications.
Scanning Barcode In Visual Studio .NET
Using Barcode Control SDK for ASP.NET Control to generate, create, read, scan barcode image in ASP.NET applications.
Cycle 12 is the Bit Send
1D Barcode Generator In Java
Using Barcode creation for Java Control to generate, create 1D image in Java applications.
Encoding Code 128 In Objective-C
Using Barcode generator for iPhone Control to generate, create Code 128 Code Set B image in iPhone applications.
SERIAL I/O
ANSI/AIM Code 128 Drawer In Visual Basic .NET
Using Barcode drawer for VS .NET Control to generate, create Code 128 Code Set A image in VS .NET applications.
ECC200 Scanner In C#
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
_TXSendDlayCheck: btfss goto goto movlw movwf bcf goto
Barcode Creation In Visual Studio .NET
Using Barcode creation for Reporting Service Control to generate, create barcode image in Reporting Service applications.
Making Barcode In .NET
Using Barcode generator for Reporting Service Control to generate, create barcode image in Reporting Service applications.
Don t Send Bit, Check for Start Bit
TXCount, 0 ; Bit Zero Set (Byte to Send) _TXNothingtoCheck $ + 1 0x004 TXCount TX _IntEnd ; Nothing Being Sent ; ; Send Bit at Start of Cycle 12 Setup the Timer to Increment 3x
Output the Start Bit
_TXNothingtoCheck: movf xorlw btfsc clrf movf xorlw btfsc clrf goto TXCount, w 0x004 ; STATUS, Z TXCount TXCount, w ; 0x09C STATUS, Z TXCount _IntEnd
Zero (Originally) TXCount
Sent 10 Bits
Yes, Clear TXCount for Next Byte
_DoRX: ; #### - Put in Receive Interrupt Code ; ; RXCount Bit 1 Bit 0 ; 0 0
; ; ; ; movlw addwf btfss goto movf
- Waiting for Character to Come In 0 1 - Receiving Character 1 0 - Have Received Valid Character 1 1 - Error Receiving, Clear Buffer/RXCount
0x004 RXCount, f STATUS, DC _RXNo RXCount, w
Check for Bit
Nothing to Check for (Yet) At the End
PIC MICROCONTROLLER APPLICATION BASICS
xorlw btfsc goto bcf btfsc bsf rrf bsf goto
0x091 STATUS, Z _RXNo STATUS, C RX STATUS, C RXByte, f RXCount, 2 _IntEnd ; Read the Current Bit
; ; ; ; ;
Start Counting from 4 Finished Receiving Byte Check Last Bit Not Valid - Error Valid - Save Value
_RXAtEnd: btfss RX goto _RXOverrun movlw movwf goto _RXNo: movf xorlw btfsc goto btfsc goto btfss goto btfsc bcf bsf btfss goto RXCount, w 0x09D STATUS, Z _RXAtEnd RXCount, 0 _IntEnd RXCount, 3 _RXStart PORTB, 3 RXCount, 3 RXCount, 0 RXCount, 1 _IntEnd 2 RXCount _IntEnd
No Bit to Receive
Read with Stop Bit
; ; ;
Something Running - Yes, Skip Over Checking Start Bits
; ; ;
Nothing - Keep Waiting Mark it has Started Something Already Saved
_RXOverrun: movlw movwf goto 0x003 RXCount _IntEnd
; Error - Mark the Overrun
SERIAL I/O
_RXStart: btfsc bcf ; PORTB, 3 RXCount, 2
Check for Low
Don t Have a Start Bit
#### - Finished with the Receive Interrupt Code
_IntEnd: movf movwf swapf swapf ret e Mainline: bsf bsf bcf movlw movwf bcf call clrf clrf bsf bsf movlw movwf movlw call Loop: call addlw addlw btfss addlw addlw NRZReceive 255 - z z - a + 1 STATUS, C h 20 A ; ; ; ; ; ; Wait for a Serial Byte to be Received Get the High limit Add Lower Limit to Set Carry If Carry Set, then Lower Case Carry NOT Set, Restore Character Add A to restore the Character TX ; Initialize the Output Port STATUS, RP0 TX 0x0D0 + PreScalerDlay ; Set up the Timer OPTION_REG ^ 0x080 STATUS, RP0 Delay TXCount RXCount INTCON, T0IE INTCON, GIE 256 - TMRReset TMR0 * NRZSend ; ; ; ; Delay 200 msecs before Sending Make Sure Nothing is Happening On Boot Initialize the Interrupt Handler _status, w STATUS _w, f _w, w ; Restore the Context Registers
Start the Timer Going
Send out a Start Character
PIC MICROCONTROLLER APPLICATION BASICS
call goto
NRZSend Loop
NRZSend: movf btfss goto movwf bsf return
TXCount, f STATUS, Z $ - 2 TXByte TXCount, 0
; ; ; ;
Send the Value in WREG Serially Wait for Previous Data Sent Counter = 0 when Sent Indicate there is Data to Send
NRZReceive: btfss RXCount, 1 goto $ - 1 movf RXByte, w clrf RXCount bcf STATUS, C return Delay: clrf clrf decfsz goto decfsz goto return Dlay Dlay + 1 Dlay, f $ - 1 Dlay + 1, f $ - 3
; Wait for a New Character to be Received ; Bit 0 Set when Data Received ; ; Get the Received Byte Carry Reset - No Error
Note that in the code I do not receive anything while I am transmitting. This is because when data is being sent, the DS275 is also passing the sent signal back through the RX lines. This results in the code actually seeing its own data coming back as input data and, in the application, converting it and sending it back out. Sending the data back out causes it to be received again, and the application begins to operate as if it were in some kind of feedback loop, with no new data getting sent and the current byte never ending. Normally, when I write this algorithm, I allow simultaneous (known as full duplex) sending and receiving. This is not possible in this application because of operation of the DS275. The circuit that I used for this application is shown in Fig. 20.32. The breadboard wiring diagram is shown in Fig. 20.33, along with the bill of materials in Table 20.15. This was the last experiment that I completed, so, of course, it was the one that had the most problems. When I was writing this, I was trying to get Chap. 21 nished on
Copyright © OnBarcode.com . All rights reserved.