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THE BASIC STAMP 2 MICROCONTROLLER
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TABLE 15-8 PINS 1 2 3 4 5 6 7 to 14
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Hitachi 44780 Controlled LCD Interface DESCRIPTION/FUNCTION Ground Vcc Contrast Voltage RS -_Instruction/Register Select RW -_Write/Read Select E Clock Data I/O Pins
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Data sent to the LCD consists of either instructions (low on RS) or characters (high on RS). The instructions specify how the LCD is to operate and can be used to poll the LCD to determine when to send the next character or command. Table 15-9 lists the different pin and data bit values for sending commands and characters to the LCD. More comprehensive information on LCDs can be found on the Internet at the sites listed in the appendices. To demonstrate how simple it is to add and program an LCD to the BS2, the circuit shown in Fig. 15-13 with the parts listed in Table 15-10 was created. The circuit should be very easy to wire together as it was designed for taking advantage of the natural layout of the BS2 as shown in Fig. 15-14. The application code to display Robot Builder s Bonanza on the two rows of the LCD is:
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' BS2 LCD - Display a simple message on an LCD module '{$STAMP BS2} '{$PBASIC 2.50} ' Variables i VAR Byte Character VAR Byte LCDData VAR OUTH LCDE PIN 6 LCDRS PIN 7 '
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Character to Display Define LCD Pins on BS2
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Initialization DIRS = %1111111111000000 ' Make Most Significant 10 Bits LCDRS = 0: LCDE = 0 ' Initialize LCD interface PAUSE 20 ' Wait for LCD to reset itself LCDData = $30: PULSOUT LCDE, 300: PAUSE 5 ' Initialize LCD PULSOUT LCDE, 300: PULSOUT LCDE, 300 ' Force reset in LCDData = $38: PULSOUT LCDE, 300: PAUSE 5 ' Initialize/Set LCDData = $10: PULSOUT LCDE, 300 ' No Shifting LCDData = $01: PULSOUT LCDE, 300: PAUSE 5 ' Clear LCD LCDData = $06: PULSOUT LCDE, 300 ' Specify Cursor Move LCDData = $0C: PULSOUT LCDE, 300 ' Enable Display & Cursor
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TABLE 15-9 RS 4 0 0 0 RW 5 0 0 0 D7 14 0 0 0
Hitachi 44780 Command and Data Table D6 13 0 0 0 D5 12 0 0 0 D4 11 0 0 0 D3 10 0 0 0 D2 9 0 0 1 D1 8 0 1 ID D0 7 1 0 S Instruction/Description LCD I/O Pins Clear Display (takes 5 msecs) Move Cursor to "Home" (5 msecs) ID = 1, Increment Cursor after Write; S = 1, Shift Display when Written to D = 1, Turn Display; C = 1, Cursor On; B = 1, Cursor Blink SC = 1, Shift Display after Write; RL = 1, Shift Display Right Reset the 44780; DL = 1, 8 Data bits; DL = 0, 4 Data bits (D8 - D5); N = 1, 2 Display Lines; F = 1, 5 10 Font (Normally leave at 0) Move Cursor into Character Graphics RAM to "A"ddress Move Cursor to specific position on LCD to "A"ddress Poll the LCD "Busy Flag" Write "D"ata to LCD at Cursor Read "D"ata in LCD at Cursor
0 0 0 1 1
0 0 1 0 1
0 1 BF D D
1 A N/U D D
A A N/U D D
A A N/U D D
A A N/U D D
A A N/U D D
A A N/U D D
A A N/U D D
TABLE 15-10 BS2 LCDs 10k Programmer Misc.
BS2 LCD Experimentation Circuit Parts List Parallax BASIC Stamp 2 16 column by 2 row character Hitachi 44780 controlled LCD 10k Potentiometer BS2 Programmer/Communications Interface Breadboard, 3x AA Alkaline Battery Clip, Breadboard Wires, Power Switch
THE BASIC STAMP 2 MICROCONTROLLER
1 2 3
SOUT SIN ATN VSS P0 P1 P2 P3 P4 P5 P6 P7
VIN VSS _RES VDD P15 P14 P13 P12 P11 P10 P9 P8
24 23 22 21 20 19 18 17 16 15 14 13 14 13 12 11 10 9 8 7 6 5 4 3 2 1
0.1 uF
4 5 6 7
BASIC Stamp 2
B6 B5 B4 B3 B2 B1 B0 E R/W R/S CON Vdd Vss
Robot Builder s Bonanza
8 9 10 11
Hitachi 44780 Based LCD
FIGURE 15-13 Circuit for adding an LCD to a BS2.
Character = 1: i = 0 LCDRS = 1 ' Print Characters on DO ' Read Each Character LOOKUP i, ["Robot Builder s", 0], Character IF (Character <> 0) THEN LCDData = Character: PULSOUT LCDE, 300 i = i + 1 ENDIF LOOP UNTIL (Character = 0) LCDRS = 0 ' Move to Bottom Line LCDData = $C0: PULSOUT LCDE, 300 Character = 1: i = 0 LCDRS = 1 ' Print Characters on DO ' Read Each Character LOOKUP i, [" Bonanza", 0], Character IF (Character <> 0) THEN LCDData = Character: PULSOUT LCDE, 300 i = i + 1 ENDIF LOOP UNTIL (Character = 0) END ' Finished
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