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'set the wait period 'define the High state 'define the Low state
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{{ Defining high and low states will allow us to invert these when we use buffers to amplify the output from the prop chip. We will then make low=1 and high=0 thus inverting all the values throughout the program. }} PUB Go DIRA[DataBit7..DataBit0]:=%11111111 DIRA[RegSelect] := High 'the DIRA[ReadWrite] := High 'the DIRA[Enable] := High 'the INITIALIZE_LCD waitcnt(1_000_000+cnt) CLEAR repeat 4 SEND_CHAR ("A") repeat 4 SEND_CHAR ("b") POSITION (1,2) repeat 4 SEND_CHAR ("C") repeat 4 SEND_CHAR ("d") repeat
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'the lines for the LCD are outputs lines for the LCD are outputs lines for the LCD are outputs lines for the LCD are outputs
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'initialize the LCD 'wait for LCD to start up 'clear the LCD 'print 4 'A's 'print 4 'a's 'move to POSITION: line 2, space 1 'print 4 'B's 'print 4 'b's 'this is a parking loop to keep the system 'from shutting down. It just loops here 'see what cursor does if it is omitted
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program 14-1 Implementation of LCD Use for Our Experiments (Listing of Methods Available within LCDRoutines ) (continued) PRI INITIALIZE_LCD waitcnt(500_000+cnt) 'The addresses and data used here are 'specified in the Hitachi data sheet for 'display. YOU MUST CHECK THIS FOR YOURSELF OUTA[RegSelect] := Low 'these three lines are specified to write OUTA[ReadWrite] := Low 'the initial set up bits for the LCD OUTA[Enable] := Low 'See Hitachi HD44780 data sheet 'display. YOU MUST CHECK THIS FOR YOURSELF. SEND_INSTRUCTION (%0011_0000) 'Send 1st waitcnt(49_200+cnt) 'wait SEND_INSTRUCTION (%0011_0000) 'Send 2nd waitcnt(1_200+cnt) 'wait SEND_INSTRUCTION (%0011_0000) 'Send 3rd waitcnt(12_000+cnt) 'wait SEND_INSTRUCTION (%0011_1000) 'Sets DL=8 bits, N=2 lines, F=5x7 font SEND_INSTRUCTION (%0000_1111) 'Display on, Cursor on, Blink on SEND_INSTRUCTION (%0000_0001) 'clear LCD SEND_INSTRUCTION (%0000_0110) 'Move Cursor, Do not shift display 'Clear the LCD display and go home
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PUB CLEAR SEND_INSTRUCTION (%0000_0001)
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PUB POSITION (LINE_NUMBER, HOR_POSITION) | CHAR_LOCATION 'Pos crsr 'HOR_POSITION : Horizontal Position : 1 to 16 'LINE_NUMBER : Line Number : 1 or 2 CHAR_LOCATION := (HOR_POSITION-1) * 64 'figure location CHAR_LOCATION += (LINE_NUMBER-1) + 128 'figure location SEND_INSTRUCTION (CHAR_LOCATION) 'send the instr to position cursor PUB SEND_CHAR (DISPLAY_DATA) 'set up for writing to the display CHECK_BUSY 'wait for busy bit to clear before sending OUTA[ReadWrite] := Low 'Set up to read busy bit OUTA[RegSelect] := High 'Set up to read busy bit OUTA[Enable] := High 'Set up to toggle bit H>L OUTA[DataBit7..DataBit0] := DISPLAY_DATA 'Ready to SEND data in OUTA[Enable] := Low 'Toggle the bit H>L PUB CHECK_BUSY | BUSY_BIT 'routine to check busy bit OUTA[ReadWrite] := High 'Set to read the busy bit OUTA[RegSelect] := Low 'Set to read the busy bit DIRA[DataBit7..DataBit0] := %0000_0000 'Set the entire port to input REPEAT 'Keep doing it till clear OUTA[Enable] := High 'set to 1 to get ready to toggle H>L bit BUSY_BIT := INA[DataBit7] 'the busy bit is bit 7 of the byte read OUTA[Enable] := Low '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 the port back to outputs
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(continued)
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program 14-1 Implementation of LCD Use for Our Experiments (Listing of Methods Available within LCDRoutines ) (continued) PUB SEND_INSTRUCTION (DISPLAY_DATA) 'set up for writing instructions CHECK_BUSY 'wait for busy bit to clear before sending OUTA[ReadWrite] := Low 'Set up to read busy bit OUTA[RegSelect] := Low 'Set up to read busy bit OUTA[Enable] := High 'Set up to toggle bit H>L OUTA[DataBit7..DataBit0] := DISPLAY_DATA 'Ready to READ data in OUTA[Enable] := Low 'Toggle the bit H>L
Program 14-1 will be improved upon, added to, and then broken up into its various methods as our skills improve. Once we have worked up a comprehensive set of methods, the methods will be placed in an object called LCDRoutines4, from where we will be able to call whatever method we need in any of the programs we develop. You do not have to worry about the details of this at this time. It will all be explained later in 21. The final versions of the programs LCDRoutines4 and Utilities are also listed in Appendix A. LCDRoutines4 is the 4-bit version of LCDRoutines. The Spin language is designed to allow the easy sharing of previously developed programs by third-party users. You are welcome to use any of the software developed in this book for use in any way you see fit as per the terms of the MIT license described in the preface of this book. You should also develop some expertise in using other objects in the object exchange maintained by Parallax so that you do not have to reinvent the wheel from time to time. Get familiar with the object exchange. It is a very useful resource for beginners.
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