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LCD8 DataPort, EPort, EPin, RSPort, RSPin, RWPort, RWPin, Frequency
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is put in where DataPort is the 8-bit I/O port. EPort and EPin are the E clock definition. RSPort and RSPin are the RS LCD data type input. RWPort and RWPin are the pins used to poll the LCD for data reply (and are essentially unused). Frequency is the PIC microcontroller operating speed and is used to calculate the delay values. The only variable required for the LCD8 and LCD8Poll macros is the 8-bit variable Dlay. This macro should work with any low-end or mid-range PIC microcontroller. Note that the LCDPORTInit subroutine cannot be used with low-end PIC microcontrollers; to set up the I/O ports, you will have to create your own tris statements. The macro is
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LCD8 Macro DataPort, EPort, EPin, RSPort, RSPin, RWPort, RWPin, Freq variable Dlay5Value, Dlay160Value, Dlay160Bit1 = -1, Dlay160Bit2 = -1 variable BitCount = 0 variable Value = 128, Bit = 7 Dlay5Value = ((5007 * (Freq / 1000) / 4000) / 7) + 256
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REUSE, RETURN, AND RECYCLE
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Dlay160Value = (163 * (Freq / 1000) / 4000) / 3 ; Find the Number of Bits and their ; positions in Dlay160Value if ((Dlay160Value & Value) != 0) if (Dlay160Bit1 == -1) ; Set the Upper Bit Dlay160Bit1 = Bit else if (Dlay160Bit2 == -1) Dlay160Bit2 = Bit endif endif BitCount = BitCount + 1 endif Value = Value >> 1 Bit = Bit - 1 endw if (BitCount > 2) ; Just Want max two Bits if ((Dlay160Bit1 - 1) == Dlay160Bit2) Dlay160Bit1 = Dlay160Bit1 + 1 ; Shift Top up by 1 Dlay160Bit2 = -1 ; Delete Second else Dlay160Bit2 = Dlay160Bit2 + 1 ; Shift Bottom up by 1 endif endif Dlay5 ; Delay 5 msecs movlw (Dlay5Value & 0x0FF00) >> 8 movwf Dlay movlw Dlay5Value & 0x0FF subwf Dlay, w xorlw 0x0FF addwf Dlay, w btfsc STATUS, Z decfsz Dlay, f goto $ - 5 return LCDPORTInit bsf STATUS, RP0 movlw 0x000 movwf DataPort bcf EPort, EPin bcf RSPort, RSPin bcf RWPort, RWPin bcf STATUS, RP0 bcf EPort, EPin bcf RSPort, RSPin ; Initialize the I/O Ports ; ONLY used by mid-range while (Bit >= 0)
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APPENDIX G
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bcf RWPort, RWPin return LCDIns movwf DataPort bcf 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 bsf Dlay, Dlay160Bit1 if (Dlay160Bit2 != -1) bsf Dlay, Dlay160Bit2 endif decfsz Dlay, f goto $ - 1 andlw 0x0FC btfsc STATUS, Z call Dlay5 return LCDChar 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 ; Send the Instruction to the LCD
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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
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secs
; Have to Delay 5 msecs
; Send the Character to the LCD
; Make Sure Proper Delay is In Place
; Make Sure Proper Delay is In Place
REUSE, RETURN, AND RECYCLE
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 movlw 0x030 call LCDIns call Dlay5 movlw 0x030 call LCDIns movlw 0x030 call LCDIns movlw 0x038 call LCDIns movlw 0x010 call LCDIns movlw 0x001 call LCDIns movlw 0x006 call LCDIns movlw 0x00E call LCDIns return endm
; Delay 160 usecs
; Do the 8 Bit Initialization ; Wait 15 msecs
; Send the Reset Instruction
; Set Interface Length ; Turn Off Display ; Clear Display RAM ; Set Cursor Movement ; Turn on Display/Cursor
Looking at the Dlay160 code, you ll notice that I restricted the number of possible bit settings to two. If more than two are set, then I rst increment the lower bit value. If the lower bit value is immediately below the upper one, then I delete the lower one and increment the upper value. This ensures that I do not delay for less than the 160 s required by the LCD. The reason why I held the delay down to two cycles is to keep the delay code as simple as possible and avoid the need for invoking DlayMacro. The LCD8Poll macro produces slightly more sophisticated code than that produced by the LCD8 macro. Instead of providing hard-coded delays in the application, the code polls the LCD to see if the operation is complete before continuing. This is done by
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