Code:
'****************************************************************************************************
'* Name : RE test WJS.pbp *
'* Author : WJ Sherwood *
'* Notice : Copyright (c) 2021 *
'* : All Rights Reserved *
'* Date : 07/02/21 *
'* Device : 16F1788 *
'* Version : 1 (PBP 3.0.10.4) *
'* Notes : Spurious "I'm Alive" serial traffic following RE action (still) and corrupt chars if *
'* : Pause at line 75 (following MaxLimit = 60) removed - what am I missing? *
'* : *
'* : REa portb.6, REb portb.5, REsw portb.4 all pulled up, active low. *
'* : *
'****************************************************************************************************
'=========================================================================================================
' CONFIGURE DEVICE
'=========================================================================================================
#CONFIG ; 16F1788.
__config _CONFIG1, _FOSC_INTOSC & _WDTE_ON & _PWRTE_ON & _MCLRE_ON & _CP_OFF & _CPD_OFF & _BOREN_OFF & _CLKOUTEN_OFF & _IESO_OFF & _FCMEN_OFF
__config _CONFIG2, _WRT_OFF & _VCAPEN_OFF & _PLLEN_OFF & _LVP_OFF & _BORV_HI & _LPBOR_OFF
#ENDCONFIG
' -----[ Initialization ]---------------------------------------------------------------------------------
TRISA = %00000000 ' Set I/O.
TRISB = %01111111 ' Set I/O.
TRISC = %00000000 ' Set I/O.
define OSC 4
OSCCON = %01101010 ' 4Mhz (F1788).
'define OSC 32
' OSCCON = %11110000 ; 32 MHz,
ANSELA = 0 ; all digital
ANSELB = 0 ; all digital
' Define LCD connections
DEFINE LCD_DREG PORTA ' LCD Data Port
DEFINE LCD_DBIT 0 ' Starting Data Bit
DEFINE LCD_RSREG PORTA ' Register Select Port
DEFINE LCD_RSBIT 4 ' Register Select Bit
DEFINE LCD_EREG PORTA ' Enable Port
DEFINE LCD_EBIT 7 ' Enable Bit
DEFINE LCD_BITS 4 ' Data Bus Size
DEFINE LCD_LINES 2 ' Number of Lines on LCD
'=========================================================================================================
' PIN ASSIGNMENTS, SYSTEM CONSTANTS, TEMPORARY VARIABLES
'=========================================================================================================
' Rotary Encoder stuff
Old_Bits VAR BYTE bank0 ' Encoder port bits before change.
New_Bits VAR BYTE bank0 ' Encoder port bits after change.
RotEnc1_val VAR word bank0 ' Connected to PORTB<6:5>.
MaxLimit var word bank0 ' Used for setting upper limit for encoder counts.
RotEncDir VAR BIT bank0 ' Direction of rotation bit.
ButtPush var bit bank0 ' Flag shows button was pushed, allows quick exit from Int handler.
REdec var bit bank0 ' Flag shows RE decrement, allows quick exit from Int handler.
REinc var bit bank0 ' Flag shows RE increment, allows quick exit from Int handler.
Include "MODEDEFS.BAS" ' Include Shiftin/out modes.
INCLUDE "DT_INTS-14.bas" ' Needs to be assembled with MPASM **********
INCLUDE "ReEnterPBP.bas" ; Include if using PBP interrupts
OPTION_REG.6 = 0 ' INTEDG set to interrupt on falling edge.
' OPTION_REG.6 = 1 ' INTEDG set to interrupt on rising edge.
' IOCBP = %01110000 ; REa portb.6, REb portb.5 pos edge trigger
IOCBN = %01110000 ; REa portb.6, REb portb.5, REsw portb.4 neg edge trigger - falling edge only.
IOCBF = 0 ; Reset the PortB flag.
INTCON = %11001000 ; GIE, PEIE, IOCIE.
MaxLimit = 60 ' Menu value limit.
' pause 100 ' Let everything settle...
latc.6 = 1 ' Prevent garbled serial - newer PICs, inverted.
serout2 PORTC.6,16468,[13,10,"I'm Alive",13,10,10]
ASM
INT_LIST macro ; IntSource, Label, Type, ResetFlag?
INT_Handler IOC_INT, _Rot_Encoder, PBP, yes ; Newer PICs.
endm
INT_CREATE ; Creates the interrupt processor .
ENDASM
@ INT_ENABLE IOC_INT ; Newer PICs.
Old_Bits = PORTB & (%01100000) ; RE uses B.6,B.5 - REa and REb.
Main:
if PortB.4 = 0 then ' Check if Encoder pushbutton was pushed.
while PortB.4 = 0:wend ' Wait for release.
pause 50 ' Debounce delay.
serout2 PORTC.6,16468,[13,10,"ButtPush = 1, RE ",dec5 RotEnc1_val]
endif
if REdec or REinc = 1 then
serout2 PORTC.6,16468,[13,10,"RE_val ",dec5 RotEnc1_val]
REdec = 0:REinc = 0 ' Reset the flags.
endif
goto main ' endless loop waiting for INT.
'---[IOC - interrupt handler]---------------------------------------------------
' Don't forget 4 counts per detent (Quadrature).
Rot_Encoder:
New_Bits = PORTB & (%01100000) ' Set port bits for Encoder's chosen A and B channels.
IF (New_Bits & %01100000) = (Old_Bits & %01100000) then DoneRotEnc ' No change.
RotEncDir = New_Bits.6 ^ Old_Bits.5 ' Bit XOR compare to get direction of rotation.
if RotEncDir = 0 then ' CCW so decrement.
if PORTB.6 and PORTB.5 = 1 then ' Only when RE both pins high (convert quad counts to singles).
RotEnc1_val = RotEnc1_val - 1 ' Decrement the count.
if RotEnc1_val => 65530 then RotEnc1_val = 0 ' Limit the max.
if RotEnc1_val <= 4 then RotEnc1_val = 0 ' Limit the min.
REdec = 1 ' Flag the event.
endif
ELSE ' RotEncDir = 1, CW so increment.
if PORTB.6 and PORTB.5 = 1 then ' Only when RE both pins high (convert quad counts to singles).
RotEnc1_val = RotEnc1_val + 1 ' Increment the count.
if RotEnc1_val >= MaxLimit then RotEnc1_val = MaxLimit ' Limit the count.
REinc = 1 ' Flag the event.
endif
ENDIF
DoneRotEnc:
Old_Bits = New_Bits
INTCON.0 = 0 ; Clean up and exit - clear IOCIF.
IOCBF = 0 ; Reset the flag.
@ INT_RETURN
end
Re: Rotary encoder with DT interrupts
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