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PRI PRINT_HEX (VALUE, DIGITS) VALUE <<= (8 - DIGITS) << 2
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PRI PRINT_BIN (VALUE, DIGITS) 'for printing values in BINARY format VALUE <<= 32 - DIGITS '32 digits is the max for our system REPEAT DIGITS 'Repeat for digits desired SEND_CHAR((VALUE <-= 1) & 1 + "0") 'send a 1 or a 0 {this blank line ends this method}
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Program 21-8 demonstrates that we have learned how to write both text and numbers to the LCD. The routine to write binary numbers (Print Hex) is also included, but it was not demonstrated in the program. Test the program for yourself to confirm that it actually works. The rule for tests is, if you have the time and expertise, test it for yourself. Do not take anyone s word for it.
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sophistiCated totaL LCd ControL
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We will not want to have to include all these routines in every object we write, so let s set up a couple objects in which to store the routines as public methods so they can be called up from any object we write. We will create two objects to do this:
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One to contain all the LCD routines One to contain the miscellaneous methods we need from time to time
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We will call the two files LCDRoutines and Utilities to make them easy to remember. We can include these in our future objects with the OBJ code by including the lines shown in Program 21-9 in each program.
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program 21-9 Calling Routine with OBJ Block Designations
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OBJ LCD : "LCDRoutines" UTIL : "Utilities"
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'We will be using 'We will be using
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METHODS in this program METHODS in this program
LCDRoutines contains the following methods at this time (we will add more methods as we need them):
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
When we put it all together, we get the code shown in Program 21-10. The routines have been taken from the programs we have developed so far, with a few simple additions. This program is in 8-bit mode.
program 21-10 Usable LCD Methods in LCDRoutines
{{21 Sep 09 Harprit Sandhu LCDRoutines.spin Propeller Tool Ver 1.2.6 21 Program 10 LCD ROUTINES (continued)
Understanding a 16-CharaCter-by-2-Line LCd dispLay
program 21-10
Usable LCD Methods in LCDRoutines (continued)
The following are the names of the methods described in this program. INITIALIZE_LCD INITIALIZE_LCD4 not yet working right. 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 DataBit0 = 8 DataBit1 = 9 DataBit2 = 10 DataBit3 = 11 DataBit4 = 12 DataBit5 = 13 DataBit6 = 14 DataBit7 = 15 RegSelect = 16 ReadWrite = 17 Enable = 18 high =1 low =0 VAR byte byte temp index
Initialize made more robust, misc unnecessary calls removed.
'all the constants used by all the METHODS 'in this program have to be listed here 'The system clock spec '10 MHz 'Data uses 8 bits from here on
'All these bits don't need to be named but 'are named so that they can be called by 'name if the need ever arises
'The three control lines ' ' {define the High state} {define the Low state} 'these are the variables we will use. 'for use as a pointer 'to count characters
PUB Go INITIALIZE_LCD repeat print(String("1234567890 L1")) position(2,1) print(String("On second line"))
(continued)
sophistiCated totaL LCd ControL
program 21-10
Usable LCD Methods in LCDRoutines (continued)
waitcnt(3_000_000+cnt) clear waitcnt(3_000_000+cnt) {{initialize the LCD to use 8 lines of data Includes a 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(5_000_000+cnt) 'specified in the Hitachi data sheet DIRA[DataBit0..Enable]~~ 'YOU MUST CHECK THIS FOR YOURSELF. SEND_INSTRUCTION (%0011_0000) 'Send 1 waitcnt(49_200+cnt) 'wait SEND_INSTRUCTION (%0011_0000) 'Send 2 waitcnt(1_200+cnt) 'wait SEND_INSTRUCTION (%0011_0000) 'Send 3 waitcnt(12_000+cnt) 'wait SEND_INSTRUCTION (%0011_1000) 'Sets DL=8 bits, N=2 lines, F=5x7 font SEND_INSTRUCTION (%0000_1110) 'Display on, Blink on, Sq Cursor off SEND_INSTRUCTION (%0000_0110) 'Move Cursor, Do not shift display SEND_INSTRUCTION (%0000_0001) 'clears the LCD POSITION (1,1) {{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 b 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..DataBit0] := D_DATA 'Ready to READ data in OUTA[Enable] := 0 'Toggle the bit H>L to Xfer the data {{Sends a character to the LCD }} PUB SEND_CHAR (D_CHAR) 'set up for writing to the display CHECK_BUSY 'wait for busy bit to clear OUTA[ReadWrite] := 0 'Set up to read busy bit OUTA[RegSelect] := 1 'Set up to read busy bit OUTA[Enable] := 1 'Set up to toggle bit H>L OUTA[DataBit7..DataBit0] := D_CHAR 'Ready to SEND data in OUTA[Enable] := 0 'Toggle the bit H>L {{Print a line of characters to the LCD uses variables index and temp }}
(continued)
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