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saves another 4 lines, the LCD can be controlled with a minimum for six lines. We will connect all 11 lines for now to allow uninhibited experimentation. The Spin language does not have a print command as such built into it. It is possible to send a target device one character at a time, but strings are not permitted. We will first create a command to send the LCD one character at a time and then build up a routine that will allow us to send a string. Here are the other commands needed:
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Initialize the LCD. Clear the LCD. Position the cursor at a given line and horizontal position. Send character (already mentioned). Send command. Print a string. Print a decimal value. Print a hexadecimal value. Print a binary value. Print a space (or spaces) to overwrite old information.
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We also need to be able to send the LCD certain nonprinting instructions, and this is done with the send command instruction mentioned in the preceding list. Let s first build up the methods that control the LCD; they use the Register Select line, the Read/Write line, and the Enable line. We set the LCD up for initial use by sending it some special instructions that specify the number of bits, number of lines, font size, cursor condition, and other factors. These instructions and their proper uses are described in the Hitachi manual.
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initiaLizing the LCd
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Before we can do anything with it, we have to initialize the liquid crystal display. The commands we have to send to the LCD are specified in the Hitachi manual. Setting this up consists of sending the commands shown in Program 21-1.
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program 21-1 Code Segment for Initializing the LCD
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PRI INITIALIZE_LCD waitcnt(150_000+cnt)
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'The addresses and data used here are 'specified in the Hitachi data sheet for the 'display. YOU MUST CHECK THE DATA SHEET. OUTA[RegSelect] := 0 'These lines are specified to write OUTA[ReadWrite] := 0 'the initial set up bits for the LCD OUTA[Enable] := 0 'See Hitachi HD44780 data sheet ' SEND_INSTRUCTION (%0011_1000) 'Sets DL=8 bits, N=2 lines, F=5x7 font waitcnt(50_000+cnt)' 'wait for instruction to execute SEND_INSTRUCTION (%0000_1111) 'Display on, Cursor on, Blink on waitcnt(12_000+cnt) 'wait for instruction to execute SEND_INSTRUCTION (%0000_0110) 'Move Cursor, Do not shift display waitcnt(12_000+cnt) 'wait for instruction to execute
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At the end of these instructions, you are ready to communicate with the LCD.
CLearing the LCd
The next command we need is one that clears the LCD no matter what it may have in its display. This will be the first instruction we send the LCD after a program startup and whenever we want to clear the display. The instructions for effecting an LCD clear are shown in Program 21-2.
program 21-2 Code Segment to Clear the LCD
PUB CLEAR SEND_INSTRUCTION (%0000_0001)
'Clear the LCD display and go home 'to the 1,1 position
positioning the CUrsor on a given Line and at a given horizontaL position
Now that we know how to initialize the LCD and how to clear it, we are ready to position the cursor at the desired line and the desired horizontal position so that the first character can be displayed where we want. We have to pass a line number and the horizontal position to this method. We define these two variables at the top of the method, as is standard practice in Spin. These are local variables. The code for positioning the cursor is shown in Program 21-3.
program 21-3 Code Segment to Position the Cursor
PUB POSITION (LINE_NUMBER, HOR_POSITION) | CHAR_LOCATION 'Position the cursor at location '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 instr to pos crsr
Note that character location is calculated twice. The first line determines the horizontal position for the output. The next lines add 128 to the value calculated for line 1, or 129 if it is calculated for line 2. This is as specified in the Hitachi manual.
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