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; Make Sure Proper Delay is In Place
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; Make Sure Proper Delay is In Place
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; Least Signi cant Nybble Second
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; Make Sure Proper Delay is In Place
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; Make Sure Proper Delay is In Place
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; Delay 160 usecs
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APPENDIX G
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bsf Dlay, Dlay160Bit2 endif decfsz Dlay, f goto $ - 1 movf LCDTemp, w andlw 0x0FC btfsc STATUS, Z call Dlay5 return LCDChar movwf LCDTemp if (DataBit == 0) swapf LCDTemp, w andlw 0x00F else andlw 0x0F0 endif movwf DataPort bsf RSPort, RSPin if (Freq > 8000000) if (Freq < 16000000) nop else goto $ + 1 endif endif bsf EPort, EPin if (Freq > 8000000) if (Freq < 16000000) nop else goto $ + 1 endif endif bcf EPort, EPin if (DataBit == 0) movf LCDTemp, w andlw 0x00F else swapf LCDTemp, w andlw 0x0F0 endif movwf DataPort bsf RSPort, RSPin if (Freq > 8000000) if (Freq < 16000000) nop
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; Have to Delay 5 msecs
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; Send the Character to the LCD ; Save the Value ; Most Signi cant Nybble First
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; Make Sure Proper Delay is In Place
; Make Sure Proper Delay is In Place
; Least Signi cant Nybble Second
; Make Sure Proper Delay is In Place
REUSE, RETURN, AND RECYCLE
else goto $ + 1 endif endif bsf EPort, EPin if (Freq > 8000000) if (Freq < 16000000) nop else goto $ + 1 endif endif bcf EPort, EPin bsf Dlay, Dlay160Bit1 if (Dlay160Bit2 != -1) bsf Dlay, Dlay160Bit2 endif decfsz Dlay, f goto $ - 1 return LCDInit call Dlay5 call Dlay5 call Dlay5 if (DataBit == 0) movlw 0x003 else movlw 0x030 endif movwf DataPort if (Freq > 8000000) if (Freq < 16000000) nop else goto $ + 1 endif endif bsf EPort, EPin if (Freq > 8000000) if (Freq < 16000000) nop else goto $ + 1 endif endif bcf EPort, EPin call Dlay5
; Make Sure Proper Delay is In Place
; Delay 160 usecs
; Do the 8 Bit Initialization ; Wait 15 msecs
; Send the Reset Instruction
; Make Sure Proper Delay is In Place
; Make Sure Proper Delay is In Place
APPENDIX G
bsf EPort, EPin if (Freq > 8000000) if (Freq < 16000000) nop else goto $ + 1 endif endif bcf EPort, EPin bsf Dlay, Dlay160Bit1 if (Dlay160Bit2 != -1) bsf Dlay, Dlay160Bit2 endif decfsz Dlay, f goto $ - 1 bsf EPort, EPin if (Freq > 8000000) if (Freq < 16000000) nop else goto $ + 1 endif endif bcf EPort, EPin bsf Dlay, Dlay160Bit1 if (Dlay160Bit2 != -1) bsf Dlay, Dlay160Bit2 endif decfsz Dlay, f goto $ - 1 if (DataBit == 0) movlw 0x002 else movlw 0x020 endif movwf DataPort if (Freq > 8000000) if (Freq < 16000000) nop else goto $ + 1 endif endif bsf EPort, EPin if (Freq > 8000000) if (Freq < 16000000) nop else
; Send Another Reset Instruction ; Make Sure Proper Delay is In Place
; Delay 160 usecs
; Send the Third Reset Instruction ; Make Sure Proper Delay is In Place
; Delay 160 usecs
; Send the Data Length Speci cation
; Make Sure Proper Delay is In Place
; Make Sure Proper Delay is In Place
REUSE, RETURN, AND RECYCLE
goto $ + 1 endif endif bcf EPort, EPin bsf Dlay, Dlay160Bit1 if (Dlay160Bit2 != -1) bsf Dlay, Dlay160Bit2 endif decfsz Dlay, f goto $ - 1 movlw 0x028 call LCDIns movlw 0x010 call LCDIns movlw 0x001 call LCDIns movlw 0x006 call LCDIns movlw 0x00E call LCDIns return endm
; Delay 160 usecs
; Set Interface Length ; Turn Off Display ; Clear Display RAM ; Set Cursor Movement ; Turn on Display/Cursor
I recommend that you put all the I/O pins and the 4-bit DataPort on the same 8-bit I/O port. The reasons for doing this is that when using this code, writes to the DataPort will change the output values of other registers. To avoid any potential problems, put the 7 bits together in the same PORT, and use the other bit only for input. The last LCD interface macro that I am providing you with is the two-wire LCD interface. This interface is quite a bit slower than the others that I have presented, but it uses the fewest PIC microcontroller I/O pins. The circuit schematic for this interface was shown earlier in the book (as are the schematics for all the LCD interfaces). The LCD2 macro requires only the Dlay and LCDTemp variables.
LCD2 Macro ClockPort, ClockPin, DataPort, DataPin, Freq variable Dlay5Value, Dlay160Value, Dlay160Bit1 = -1, Dlay160Bit2 = -1 variable BitCount = 0, i variable Value = 128, Bit = 7 Dlay5Value = ((5007 * (Freq / 1000) / 4000) / 7) + 256 Dlay160Value = (163 * (Freq / 1000) / 4000) / 3 while (Bit >= 0) ; Find the Number of Bits and their ; Positions in Dlay160Value
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