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

Drawing QR Code ISO/IEC18004 in Software Understanding a 16-CharaCter-by-2-Line LCd dispLay

Understanding a 16-CharaCter-by-2-Line LCd dispLay
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program 21-10
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Usable LCD Methods in LCDRoutines (continued)
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PUB PRINT (the_line)
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'This routine handles more than one Char 'called as PRINT(string("the_line")) '"the_line" contains pointr to line 'because we have to point to the line 'zero terminated but will not use that. 'use the string size instead. Easier index:=0 'Reset the counter we are using repeat 'repeat for all chars in the list temp:= byte[the_line][index++]'temp contains the char pointed by index SEND_CHAR (temp) 'send the 'pointed to' char to the LCD while index<strsize(the_line) ' till the last char is sent
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{{Position cursor }} PUB POSITION (LINE_NUMBER, HOR_POSITION) | CHAR_LOCATION 'Pos the crsr 'Horizontal Position : 1 to 16 'specified by the two numbers 'Line Number : 1 or 2 CHAR_LOCATION := (LINE_NUMBER-1) * 64 'figr loc. See Hitachi data CHAR_LOCATION += (HOR_POSITION-1) + 128 'figr loc. See Hitachi data SEND_INSTRUCTION (CHAR_LOCATION) 'send the instr to pos crsr {{Check for busy }} PUB 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 of the byte read 'INA is the 32 input pins on the PROP and we 'are reading data bit 7 which is on pin 15! OUTA[Enable] := 0 'make the enable bit go low for H>L toggle WHILE (BUSY_BIT == 1) 'do it as long as the busy bit is 1 DIRA[DataBit7..DataBit0] := %1111_1111 'set back to outputs {{Print decimal }} PUB PRINT_DEC (VALUE) | TEST_VALUE'for printing values in decimal format IF (VALUE < 0) 'if it is a negative value -VALUE 'change it to a positive SEND_CHAR("-") 'and print a - sign on the LCD ' TEST_VALUE := 1_000_000_000 'we get indiv digits by comp to this 'value. div by 10 to get the nxt val REPEAT 10 'T 10 digits maximum in our system (continued)
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sophistiCated totaL LCd ControL
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program 21-10
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Usable LCD Methods in LCDRoutines (continued)
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IF (VALUE => TEST_VALUE) 'see if bigger than testValue SEND_CHAR(VALUE / TEST_VALUE + "0") 'divide to get the digit VALUE //= TEST_VALUE 'figure for the next digit RESULT~~ 'result we can pass it on below ELSEIF (RESULT OR TEST_VALUE == 1) 'if then div was even SEND_CHAR("0") 'so we sent out a zero TEST_VALUE /= 10 'we divide by 10 to test for the next digit {{Print Hex }} PUB PRINT_HEX (VALUE, DIGITS) 'for printing values in HEX format VALUE <<= (8 - DIGITS) << 2 ' specify up to 8 digits, FFFFFFFF max REPEAT DIGITS 'do each digit SEND_CHAR(LOOKUPZ((VALUE <-= 4) & $F : "0".."9", "A".."F")) 'use lookup table to select character {{Print Binary }} ' PUB PRINT_BIN (VALUE, DIGITS) 'for printing values in BINARY format VALUE <<= 32 - DIGITS '32 binary digits is the max for our system REPEAT DIGITS 'Repeat for each digit desired SEND_CHAR((VALUE <-= 1) & 1 + "0") 'send a 1 or a 0 {{Clear screen }} PUB CLEAR 'Clear the LCD display and go home SEND_INSTRUCTION (%0000_0001) ' clear screen and go home command {{Go to position 1,1 }} PUB HOME SEND_INSTRUCTION (%0000_0011) {{Print spaces }} PUB SPACE (qty) repeat (qty) PRINT(STRING(" "))
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'go to position 1,1. 'Not cleared
'Prints spaces, for between numbers
In order to make the LCD routines useful, they need to be amenable to thorough testing from time to time. To do that, we need a program that tests all the routines automatically and then automatically displays what is going on in the LCD (see Program 21-11). This will be especially useful when we have to make a change to a routine and need to ensure that it still works with everything else the way we intended.
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