Code:
'***************************************************************************
'* Name : RHKeypad.pbp *
'* Author : Demon *
'* Date : Apr 14 2015 *
'* Version : 1.0 *
'* Notes : 4 x 4 Keypad on Port B *
'* *
'* B0 = Row 1 *
'* B1 = Row 2 *
'* B2 = Row 3 *
'* B3 = Row 4 *
'* B4 = Column 1 *
'* B5 = Column 2 *
'* B6 = Column 3 *
'* B7 = Column 4 *
'* *
'* Pull-up resistors are enabled. *
'* Set rows to output. *
'* Set columns to input. *
'* Process each row one at a time: *
'* Set selected row to 0 (VSS), other rows to 1 (VDD). *
'* Pressing a button in that row connects the pin to VSS. *
'* Check columns if a pin is connected to VSS. *
'* *
'* Hardware : PIC 18F4550, 20mhz crystal *
'* MeLabs U2 Programmer v4.32 *
'* Lab X1 board *
'* Software : PIC Basic Pro v2.60C *
'* MicroCode Studio Plus v2.2.1.1 *
'* MPASM v5.46 *
'***************************************************************************
'--- if you use these, you must comment the ones in the .inc file ---
@ __CONFIG _CONFIG1L, _PLLDIV_5_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_2_1L
@ __CONFIG _CONFIG1H, _FOSC_HSPLL_HS_1H
@ __CONFIG _CONFIG2L, _PWRT_OFF_2L & _BOR_ON_2L & _BORV_1_2L & _VREGEN_ON_2L
@ __CONFIG _CONFIG2H, _WDT_OFF_2H
@ __CONFIG _CONFIG3H, _CCP2MX_ON_3H & _PBADEN_OFF_3H & _LPT1OSC_OFF_3H & _MCLRE_ON_3H
@ __CONFIG _CONFIG4L, _STVREN_ON_4L & _LVP_OFF_4L & _ICPRT_OFF_4L & _XINST_OFF_4L
;--- Oscillator speed ----------------------------------------------------------
DEFINE OSC 48
;--- Setup Registers -----------------------------------------------------------
ADCON1 = %00001111 ' A/D CONTROL REGISTER 1
' Bit 7-6 Unimplemented: Read as 0
' Bit 5 VCFG1: Voltage Reference Configuration bit (VREF- source)
' 1 = VREF- (AN2)
' 0 = VSS
' Bit 4 VCFG0: Voltage Reference Configuration bit (VREF+ source)
' 1 = VREF+ (AN3)
' 0 = VDD
' Bit 3-0 PCFG3:PCFG0: A/D Port Configuration Control bits:
' 1111 = All digital on Port A
' See datasheet for table
INTCON2 = %00000000 ' INTERRUPT CONTROL REGISTER 2
' Bit 7 RBPU: PORTB Pull-up Enable bit
' 1 = All PORTB pull-ups are disabled
' 0 = PORTB pull-ups are enabled by individual port latch values
' Bit 6 INTEDG0: External Interrupt 0 Edge Select bit
' 1 = Interrupt on rising edge
' 0 = Interrupt on falling edge
' Bit 5 INTEDG1: External Interrupt 1 Edge Select bit
' 1 = Interrupt on rising edge
' 0 = Interrupt on falling edge
' Bit 4 INTEDG2: External Interrupt 2 Edge Select bit
' 1 = Interrupt on rising edge
' 0 = Interrupt on falling edge
' Bit 3 Unimplemented: Read as 0
' Bit 2 TMR0IP: TMR0 Overflow Interrupt Priority bit
' 1 = High priority
' 0 = Low priority
' Bit 1 Unimplemented: Read as 0
' Bit 0 RBIP: RB Port Change Interrupt Priority bit
' 1 = High priority
' 0 = Low priority
;--- Setup Port directions -----------------------------------------------------
TRISA = %00000000
TRISB = %11110000 ' Set columns to input, rows to output
TRISC = %00000000
TRISD = %00000000
TRISE = %00000000
;--- Pins ----------------------------------------------------------------------
Column1 VAR PORTB.4
Column2 VAR PORTB.5
Column3 VAR PORTB.6
Column4 VAR PORTB.7
;--- Setup LCD -----------------------------------------------------------------
DEFINE LCD_DREG PORTD ' Set LCD data port
DEFINE LCD_DBIT 4 ' Set starting data bit
DEFINE LCD_RSREG PORTE ' Set LCD register select port
DEFINE LCD_RSBIT 0 ' Set LCD register select bit
DEFINE LCD_EREG PORTE ' Set LCD enable port
DEFINE LCD_EBIT 1 ' Set LCD enable bit
DEFINE LCD_BITS 4 ' Set LCD bus size
DEFINE LCD_LINES 2 ' Set number of lines on LCD
DEFINE LCD_COMMANDUS 1000 ' Set command delay time in microseconds
DEFINE LCD_DATAUS 50 ' Set data delay time in microseconds
;--- Variables (Constants) -----------------------------------------------------
Row1 CON %00001110 ' Set selected row to VSS, others to VDD
Row2 CON %00001101
Row3 CON %00001011
Row4 CON %00000111
;--- Program Start -------------------------------------------------------------
Start:
PAUSE 1500 ' wait for PIC and LCD to stabilize
LCDOUT $FE,1,"18F4550 Keypad "
;--- Main Program --------------------------------------------------------------
ProgramMain:
PORTB = Row1 ' select row 1
IF Column1 = 0 THEN LCDOUT $FE,$C0,"Row 1, Column 1"
IF Column2 = 0 THEN LCDOUT $FE,$C0,"Row 1, Column 2"
IF Column3 = 0 THEN LCDOUT $FE,$C0,"Row 1, Column 3"
IF Column4 = 0 THEN LCDOUT $FE,$C0,"Row 1, Column 4"
PORTB = Row2 ' select row 2
IF Column1 = 0 THEN LCDOUT $FE,$C0,"Row 2, Column 1"
IF Column2 = 0 THEN LCDOUT $FE,$C0,"Row 2, Column 2"
IF Column3 = 0 THEN LCDOUT $FE,$C0,"Row 2, Column 3"
IF Column4 = 0 THEN LCDOUT $FE,$C0,"Row 2, Column 4"
PORTB = Row3 ' select row 3
IF Column1 = 0 THEN LCDOUT $FE,$C0,"Row 3, Column 1"
IF Column2 = 0 THEN LCDOUT $FE,$C0,"Row 3, Column 2"
IF Column3 = 0 THEN LCDOUT $FE,$C0,"Row 3, Column 3"
IF Column4 = 0 THEN LCDOUT $FE,$C0,"Row 3, Column 4"
PORTB = Row4 ' select row 4
IF Column1 = 0 THEN LCDOUT $FE,$C0,"Row 4, Column 1"
IF Column2 = 0 THEN LCDOUT $FE,$C0,"Row 4, Column 2"
IF Column3 = 0 THEN LCDOUT $FE,$C0,"Row 4, Column 3"
IF Column4 = 0 THEN LCDOUT $FE,$C0,"Row 4, Column 4"
PAUSE 50 ' Simple debounce delay
Goto ProgramMain ' Loop
END
Robert
4 x 4 Keypad on Port B (18F4550 with Lab X1)
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