barcode scanner sdk vb.net Understanding a 16-CharaCter-by-2-Line LCd dispLay in Software

Encoding QR Code 2d barcode in Software Understanding a 16-CharaCter-by-2-Line LCd dispLay

Understanding a 16-CharaCter-by-2-Line LCd dispLay
Denso QR Bar Code Reader In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
QR Creator In None
Using Barcode creation for Software Control to generate, create QR Code image in Software applications.
program 21-8
QR Reader In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
Quick Response Code Printer In Visual C#
Using Barcode generator for VS .NET Control to generate, create QR Code JIS X 0510 image in .NET framework applications.
Comprehensive LCD Control (Demonstration) (continued)
Quick Response Code Creator In .NET Framework
Using Barcode creator for ASP.NET Control to generate, create Quick Response Code image in ASP.NET applications.
QR-Code Creator In .NET Framework
Using Barcode drawer for .NET framework Control to generate, create Quick Response Code image in .NET framework applications.
Delays in the print routines have been eliminated to speed things up. The output blinks "Hello world" and 1234567890"on the two lines. }} CON _CLKMODE=XTAL1 + PLL2X _XINFREQ = 5_000_000 DataBit0 = 8 DataBit7 = 15 RegSelect = 16 ReadWrite = 17 Enable = 18 waitPeriod =5_000_000 high =1 low =0 VAR long index long char_index
QR Code Creation In VB.NET
Using Barcode generator for .NET Control to generate, create QR Code 2d barcode image in Visual Studio .NET applications.
Generate Data Matrix 2d Barcode In None
Using Barcode creator for Software Control to generate, create Data Matrix image in Software applications.
'The system clock spec 'the oscillator frequency 'Data uses 8 bits from 'lines 8 to 15 'The three control lines, register select 'Read Write and 'Enable line 'set the wait period, about 1/2 sec 'define the High state 'define the Low state
Making Barcode In None
Using Barcode generation for Software Control to generate, create bar code image in Software applications.
Generating Code 39 Full ASCII In None
Using Barcode generation for Software Control to generate, create Code 39 Full ASCII image in Software applications.
'used to count the chars in the string 'used to count the chars in the string
Code 128 Code Set C Maker In None
Using Barcode creation for Software Control to generate, create Code-128 image in Software applications.
UPC-A Supplement 2 Printer In None
Using Barcode generation for Software Control to generate, create UPC Symbol image in Software applications.
PUB START DIRA[16..18]~~ 'set these 8 lines to outputs INITIALIZE_LCD 'this initializes LCD DIRA[DataBit7..DataBit0] := %1111_1111 '11 lines LCD as outputs DIRA[RegSelect] := 1 'select the register for the LCD DIRA[ReadWrite] := 1 'set to write DIRA[Enable] := 1 'enable operation repeat 'this loops forever initialize_lcd 'init the LCD waitCnt(waitPeriod + cnt) 'wait to see it clear position (1,1) ' go to pos 1,1 PRINT(string("Hello world")) 'display text message POSITION (2, 1) 'pos to line 2 position 1 PRINT_DEC (1234567890) 'print the number waitCnt(waitPeriod + cnt) 'wait before looping PRI INITIALIZE_LCD waitcnt(500_000+cnt) OUTA[RegSelect] := 0 OUTA[ReadWrite] := 0 OUTA[Enable] := 0 SEND_INSTRUCTION (%0011_1000) SEND_INSTRUCTION (%0000_0001) SEND_INSTRUCTION (%0000_1100) 'The addresses and data used here are 'specified in the Hitachi data sheet for the 'display. YOU MUST CHECK THIS FOR YOURSELF. 'three lines are specified so we can write 'the initial set up bits for the LCD 'See Hitachi HD44780 data sheet 'Sets DL=8 bits, N=2 lines, F=5x7 font 'clears the LCD 'Display on, Cursor off, Blink off (continued)
RM4SCC Printer In None
Using Barcode creator for Software Control to generate, create British Royal Mail 4-State Customer Barcode image in Software applications.
Making EAN13 In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create EAN13 image in ASP.NET applications.
sophistiCated totaL LCd ControL
Painting GS1 - 13 In VS .NET
Using Barcode printer for Reporting Service Control to generate, create GS1 - 13 image in Reporting Service applications.
DataMatrix Generation In None
Using Barcode creation for Font Control to generate, create DataMatrix image in Font applications.
program 21-8
Print USS-128 In None
Using Barcode drawer for Font Control to generate, create UCC.EAN - 128 image in Font applications.
Barcode Creator In None
Using Barcode generation for Office Word Control to generate, create bar code image in Word applications.
Comprehensive LCD Control (Demonstration) (continued)
Bar Code Printer In Objective-C
Using Barcode encoder for iPhone Control to generate, create barcode image in iPhone applications.
Reading EAN / UCC - 13 In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
SEND_INSTRUCTION (%0000_0110) 'Move Cursor, Do not shift display {this blank line ends this method} PRI CLEAR 'Clear the LCD display and go home SEND_INSTRUCTION (%0000_0001) ' clear screen, go home command {this blank line ends this method} PRI PRINT (the_line) 'routine handles more Chars at a time 'called as PRINT(string("the_line")) " 'the line" contains the pointer to the line. 'because we have to point to the line 'zero terminated but we will not use that. 'We will use the string size instead. 'This was is easier to understand index:=0 'Reset the counter to count chars sent repeat 'repeat for all chars in the list char_index:= byte[the_line][index++] 'contains the char/byte 'pointed to by the index SEND_CHAR (char_index) ' 'pointed to' char to the LCD while index<strsize(the_line) ' till last char is sent 'Pos the crsr 'at location CHAR_LOCATION := (LINE_NUMBER-1) * 64 'fig loc. See Hitachi data sht CHAR_LOCATION += (HOR_POSITION-1) + 128 'fig loc. See Hitachi data sht SEND_INSTRUCTION (CHAR_LOCATION) ' position cursor
PRI POSITION (LINE_NUMBER, HOR_POSITION) | CHAR_LOCATION
PRI SEND_CHAR (DISPLAY_CHAR) 'set up for writing to the display CHECK_BUSY 'wait for busy bit to clear OUTA[ReadWrite] := 0 'Set up to read busy bit OUTA[RegSelect] := 1 'Set up to read busy bit OUTA[Enable] := 1 'Set up to toggle bit H>L OUTA[DataBit7..DataBit0] := DISPLAY_CHAR 'Ready to SEND data in OUTA[Enable] := 0 'Toggle the bit H>L PRI CHECK_BUSY | BUSY_BIT 'routine to check busy bit OUTA[ReadWrite] := 1 'Set to read the busy bit OUTA[RegSelect] := 0 'Set to read the busy bit DIRA[DataBit7..DataBit0] := %0000_0000 'Set to be an input REPEAT 'Keep doing it till clear OUTA[Enable] := 1 'set to 1 to toggle H>L this bit BUSY_BIT := INA[DataBit7] 'the busy bit is bit 7 'INA is the 32 input pins on the PROP, we 'are reading data bit 7 on pin 15! OUTA[Enable] := 0 'make the enable low for H>L toggle (continued)
Understanding a 16-CharaCter-by-2-Line LCd dispLay
program 21-8
Comprehensive LCD Control (Demonstration) (continued)
WHILE (BUSY_BIT == 1) 'as long as the busy bit is 1 DIRA[DataBit7..DataBit0] := %1111_1111 ' data port back to outputs PRI SEND_INSTRUCTION (DISPLAY_DATA) 'set up for writing instructions CHECK_BUSY 'wait for busy bit to clear OUTA[ReadWrite] := 0 'Set up to read busy bit OUTA[RegSelect] := 0 'Set up to read busy bit OUTA[Enable] := 1 'Set up to toggle bit H>L OUTA[DataBit7..DataBit0] := DISPLAY_DATA 'Ready to READ data in OUTA[Enable] := 0 'Toggle the bit H>L PRI PRINT_DEC (VALUE) | TEST_VALUE IF (VALUE < 0) -VALUE SEND_CHAR("-") TEST_VALUE := 1_000_000_000 'for print vals in deci format 'if it is a negative value 'change it to a positive 'and print a - sign on the LCD 'we comp to this 'value REPEAT 10 'There are 10 digits maximum IF (VALUE => TEST_VALUE) 'see if our num > than testValue SEND_CHAR(VALUE / TEST_VALUE + "0") ' divide to get the digit VALUE //= TEST_VALUE 'figure for the nxt digit RESULT~~ 'result so we can pass it on ELSEIF (RESULT OR TEST_VALUE == 1) 'then division was even SEND_CHAR("0") 'so we sent out a zero TEST_VALUE /= 10 ' test the next digit 'for printing values in HEX format 'you can specify up to 8 digits or 'FFFF FFFF max REPEAT DIGITS 'do each digit SEND_CHAR(LOOKUPZ((VALUE <-= 4) & $F : "0".."9", "A".."F")) 'use look up table to select character
Copyright © OnBarcode.com . All rights reserved.