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Setting Up a 16-CharaCter-by-2-Line LiqUid CryStaL diSpLay
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tabLe 14-1
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pinoUt ConneCtionS for a typiCaL 16 2 LCd
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Pin no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
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Symbol VSS VDD VO RS R/W E DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 BL BL
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DeScriPtion Logic ground. Logic power 5 volts. Contrast of the display. Can usually be grounded. Register select. Read/Write. Enable. These are the three control lines.
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This is one port or eight lines of data. Half the port can also be used. See the data sheet. Backlight power. Backlight ground. These two lines can be ignored.
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figure 14-1 lcD placement on the perf board installed at extreme right, as low as possible. (eight-bit path shown.)
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tabLe 14-2
Wiring ConneCtionS betWeen the propeLLer and the LCd
Pin no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Symbol VSS VDD VO RS R/W E DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 BL BL
ProPeller Pin Ground 5 volts Ground P18 P17 P16 P15 P14 P13 P12 P11 P10 P9 P8
Data can be transferred to the LCD either 8 bits at a time or 4 bits at a time. Initially, we will wire up all eight lines of the data bus, but once we get the LCD working, we will change over to 4-bit mode so that we can free up four lines for other uses. The Spin code we will be using to access the LCD is listed in Program 14-1. This code will display four A s and four a s on line 1 and four B s and four b s on line 2 when everything is wired up correctly and the program is downloaded and run. Wire up the LCD and run the program to confirm this. The code for this program is listed here so you can see what we are doing, but the code will not be explained at this time so that we can move on to the experiments as soon as possible. The various routines will be placed in an LCDRoutines4 program, and we will be able to call every method in LCDRoutines4 by its name from our programs. We will not have to type in any of this code again. All this is explained in 21, which is devoted to a very detailed explanation of how an LCD needs to be set up and the programs written to access the features we have in mind. The listing provided here also demonstrates the ability of the Spin language to create electronic diagrams within the Spin language with the Parallax font. Only the diagram for this exercise was drawn with the Parallax font in this book. All other diagrams were drawn in AutoCAD because at this time the Parallax font does not permit the creation of logic gates and some other elements that need to be documented for our experiments.
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I understand that this deficiency is to be remedied in a future version of the chip and may well be in place by the time you read these words.
program 14-1 Implementation of LCD Use for Our Experiments (Listing of Methods Available within LCDRoutines ) {{11 Sep 09 Harprit Sandhu LCDminimal.spin Propeller Tool Ver 1.2.6 14 Program 1 PROGRAM TO BEGIN USING THE LCD A minimal LCD implementation to allow us to use the LCD in our experiments immediately. This program is an absolutely minimal implementation to make the LCD usable. You can work on improving it. We will improve it later. POWER ETC: - - BASIC CONNECTIONS 1 0 9 8 7 6 5 4 3 X X G 3 2 1 0 9 8 7 6 FOR THE EDUCATION KIT ARE STANDARD Propeller CHIP CONNECTIONS AND ARE 0 1 2 3 4 5 6 7 G B R 3 8 9 0 1 2 3 4 5 NOT SHOWN HERE 5VDC --------- G 5 G S W E 0 1 2 3 4 5 6 7 --------- 16 CHAR BY 2 LINE LCD DISPLAY GND 8 BIT MODE Schematic Revisions
(continued)
Setting Up a 16-CharaCter-by-2-Line LiqUid CryStaL diSpLay
program 14-1 Implementation of LCD Use for Our Experiments (Listing of Methods Available within LCDRoutines ) (continued) Pin assignments are assigned as constants because the pins are fixed. These numbers reflect the actual wiring on the board between the Propeller and the 16x2 LCD display. If you want the LCD on other lines, that would have to be specified here. We are going to use 8-bit mode to transfer data for now. All these numbers refer to lines on the Propeller. }} CON _CLKMODE=XTAL1 + PLL2X _XINFREQ = 5_000_000 RegSelect ReadWrite Enable DataBit0 DataBit7 waitPeriod high low = 16 = 17 = 18 = 8 = 15 =500_000 =1 =0
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