barcode scanner sdk vb.net program 21-13 Listing for Program LCDRoutines4 in Software

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program 21-13 Listing for Program LCDRoutines4
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{{21 Sep 09 Harprit Sandhu LCDRoutines4.spin Propeller Tool Version 1.2.6 21 Program 13 and Appendix LCD ROUTINES for a 4-bit data path. (continued)
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4-bit Mode
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program 21-13
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Listing for Program LCDRoutines4 (continued)
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The following are the names of the methods described in this program. INITIALIZE_LCD PRINT (the_line) POSITION (LINE_NUMBER, HOR_POSITION) | CHAR_LOCATION SEND_CHAR (DISPLAY_CHAR) SEND_CHAR (DISPLAY_CHAR) PRINT_DEC (VALUE) | TEST_VALUE PRINT_HEX (VALUE, DIGITS) PRINT_BIN (VALUE, DIGITS) CLEAR HOME SPACE (QTY) Revisions 04 Oct 09 }} CON _CLKMODE=XTAL1 + PLL2X _XINFREQ = 5_000_000 DataBit4 = 12 DataBit5 = 13 DataBit6 = 14 DataBit7 = 15 RegSelect = 16 ReadWrite = 17 Enable = 18 high =1 low =0 Inv_high =0 Inv_low =1 VAR byte byte temp index
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'all the constants used by all the METHODS 'in this program have to be listed here 'The system clock spec. 2 X multiplier 'ext crystal is 5 MHz, so 10 MHz operation 'are named so that they can be called by 'name if the need ever arises ' ' 'The three control lines 'The three control lines 'The three control lines 'define the High state 'define the Low state 'define the Inverted High state 'define the Inverted Low state 'these are the variables we will use 'for use as a pointer 'to count characters
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PUB Go INITIALIZE_LCD repeat print(String("4bit mode line 1")) position(2,1) print(String("4bit mode line 2")) waitcnt(clkfreq/4+cnt) clear
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Understanding a 16-CharaCter-by-2-Line LCd dispLay
program 21-13
Listing for Program LCDRoutines4 (continued)
waitcnt(clkfreq/4+cnt) {{initialize the LCD to use 4 lines of data Includes the half-second delay, clears the display and positions to 1,1 no variables used }} PUB INITIALIZE_LCD 'The addresses and data used here are waitcnt(150_000+cnt) 'specified in the Hitachi data sheet for the DIRA[DataBit4..Enable]~~ 'display. YOU MUST CHECK THIS FOR YOURSELF. SEND_INSTRUCTION (%0011) 'Send 1st waitcnt(49_200+cnt) 'wait SEND_INSTRUCTION (%0011) 'Send 2nd waitcnt(1_200+cnt) 'wait SEND_INSTRUCTION (%0011) 'Send 3rd waitcnt(12_000+cnt) 'wait SEND_INSTRUCTION (%0010) 'set for 4 bit mode waitcnt(12_000+cnt) 'wait SEND_INSTRUCTION2 (%0010_1000) ' waitcnt(12_000+cnt) SEND_INSTRUCTION2 (%0000_1100) ' waitcnt(12_000+cnt) SEND_INSTRUCTION2 (%0000_0110) ' waitcnt(12_000+cnt) SEND_INSTRUCTION2 (%0000_0001) 'waitcnt(12_000+cnt) POSITION (1,1) 'Sets DL=4 bits, N=2 lines, F=5x7 font 'wait 'Display on, Blink on, Sq Cursor off 'wait 'Move Cursor, Do not shift display 'wait 'clears the LCD 'wait
{{Sends instructions as opposed to a character to the LCD no variables are used }} PUB SEND_INSTRUCTION (D_DATA) 'set up for writing instructions CHECK_BUSY 'wait for busy bit to clear before sending 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..DataBit4] := D_DATA 'Ready to READ data in OUTA[Enable] := 0 'Toggle the bit H>L to Xfer the data {{Sends an instruction as opposed to a character to the LCD no variables are used }} PUB SEND_INSTRUCTION2 (D_DATA) 'set up for writing instructions CHECK_BUSY 'wait for busy bit to clear before sending OUTA[ReadWrite] := 0 'Set up to read busy bit (continued)
4-bit Mode
program 21-13
Listing for Program LCDRoutines4 (continued)
OUTA[RegSelect] := 0 OUTA[Enable] := 1 OUTA[DataBit7..DataBit4] OUTA[Enable] := 0 OUTA[Enable] := 1 OUTA[DataBit7..DataBit4] OUTA[Enable] := 0
'Set up to read busy bit 'Set up to toggle bit H>L := D_DATA>>4 'Ready to READ data in 'Toggle the bit H>L to Xfer the data 'Set up to toggle bit H>L := D_DATA 'Ready to READ data in 'Toggle the bit H>L to Xfer the data
{{Sends a single character to the LCD in two halves }} PUB SEND_CHAR (D_CHAR) 'set up for writing to the display CHECK_BUSY 'wait for busy bit to clear before sending OUTA[ReadWrite] := 0 'Set up to send data OUTA[RegSelect] := 1 'Set up to send data OUTA[Enable] := 1 'go high OUTA[DataBit7..DataBit4] := D_CHAR>>4 'Send high 4 bits OUTA[Enable] := 0 'Toggle the bit H>L OUTA[Enable] := 1 'go high again OUTA[DataBit7..DataBit4] :=D_CHAR 'send low 4 bits OUTA[Enable] := 0 'Toggle the bit H>L {{Print a line of characters to the LCD uses variables index and temp }} PUB PRINT (the_line) 'This routine handles more than one Char at a time 'called as PRINT(string("the_line")) '"the_line" contains the pointer to line. Line is 'because we have to point to the line 'zero terminated but we will not use that. We will 'use the string size instead. Easier to understand index:=0 'Reset the counter we are using to count chars sent repeat 'repeat for all chars in the list temp:= byte[the_line][index++] 'temp contns 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 {{Position cursor }} PUB POSITION (LINE_NUMBER, HOR_POSITION) | CHAR_LOCATION 'Line Number : 1 to 4 'Horizontal Position : 1 to 20 'specified by the two numbers CHAR_LOCATION := (LINE_NUMBER-1) * 64 'figure location. See Hitachi CHAR_LOCATION += (HOR_POSITION-1) + 128 'figure location. See Hitachi ' CHAR_LOCATION += (HOR_POSITION-1) + 128 ' CHAR_LOCATION += (HOR_POSITION-1) + 128 SEND_INSTRUCTION2 (CHAR_LOCATION) ' instr to position cursor (continued)
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