PIC16Fxxx的LCD驱动程序(适用于HD44780兼容的驱动器)

bsfLCD_CNTL,E ; Clock nibble intoLCD
bcfLCD_CNTL,E
return
;
;*******************************************************************
;* clrLCD - Clear the contents of the LCD *
;*******************************************************************
clrLCD
movlw CLR_DISP ; Send the command to clear display
call SendCmd
return
;
;*******************************************************************
;* L1homeLCD - Moves the cursor to home position on Line 1 *
;*******************************************************************
L1homeLCD
movlw DD_RAM_ADDR|0x00 ; Send command to move cursor to
call SendCmd ; home position on line 1
return

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;*******************************************************************
;* L2homeLCD - Moves the cursor to home position on Line 2 *
;*******************************************************************
L2homeLCD
movlw DD_RAM_ADDR|0x28 ; Send command to move cursor to
call SendCmd ; home position on line 2
return

;*******************************************************************
;* Delay - Generic LCD delay (1.024mS @ 4MHz) *
;* Since the microcontroller can not read the busy flag of the *
;* LCD, a specific delay needs to be executed between writes to *
;* the LCD. *
;*******************************************************************
Delay_1MS ; 2 cycles for call
clrf Count ; 1 cycle to clear counter variable
Dloop
nop
decfsz Count,F ; These two instructions provide a
goto Dloop ; (256 * 3) -1 cycle count
return ; 2 cycles for return
;
;*******************************************************************
;* Delay - 1mS base delay *
;* input : W Reg. *
;* *
;*******************************************************************
Delay_MS
movwf Count1
;
DLop1 call Delay_1MS
decfsz Count1,F
goto DLop1
return
;
END

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