isp_quad_encoder_wbtn.spin2

'' =================================================================================================
''
''   File....... isp_quad_encoder_wbtn.spin2
''   Purpose.... provide access to rotary values and button press (no smartpin use)
''   Authors.... Stephen M Moraco
''               -- Copyright (c) 2023 Iron Sheep Productions, LLC
''               -- see below for terms of use
''   E-mail..... stephen@ironsheep.biz
''   Started.... May 2023
''   Updated.... 12 May 2023
''
'' =================================================================================================
''

CON { app constants }

    ENC_STACK_SIZE_LONGS = 64

VAR

    LONG    position
    LONG    encBits
    LONG    encStack[ENC_STACK_SIZE_LONGS]

    LONG    pinEnc0
    LONG    pinEnc1
    LONG    pinEncBtn

pub null()

'' This is not a top-level object

PUB start(pnEnc0, pnEnc1, pnBtn)

    'debug(`term term1 size 5 2 textsize 42 color blue)
    'debug(`term term2 size 20 2 textsize 42 color yellow)
    pinEnc0 := pnEnc0
    pinEnc1 := pnEnc1
    pinEncBtn := pnBtn

    cogspin(NewCog, TaskContinuousEncoder(), @encStack)

    repeat
        'debug(`term1 '`(position/4)' 10)    ' 10 == NewLine
        'debug(`term2 'bits=`%(encBits)' 10)    ' 10 == NewLine
        waitms(200)
        if ina.[pinEncBtn] == 0  ' Q: btn pressed? (no debounce)
            position~

VAR

    long    sampleCt

PRI TaskContinuousEncoder()
'' read quad encoder signles on pins 1 & 2, update postion based on change
    position := 0
    encBits := -1
    sampleCt := -1
    encBits := getNExtEncValueNot(encBits)
    repeat
        case encBits
            %00:
                encBits := getNExtEncValueNot(encBits)
                if encBits == %01
                    position--
                elseif encBits == %10
                    position++
            %01:
                encBits := getNExtEncValueNot(encBits)
                if encBits == %11
                    position--
                elseif encBits == %00
                    position++
            %10:
                encBits := getNExtEncValueNot(encBits)
                if encBits == %00
                    position--
                elseif encBits == %11
                    position++
            %11:
                encBits := getNExtEncValueNot(encBits)
                if encBits == %10
                    position--
                elseif encBits == %01
                    position++

pri getNExtEncValueNot(wasValue) : newValue
    sampleCt++
    repeat
        newValue := ina.[pinEnc1..pinEnc0]
    until newValue <> wasValue
    debug("enc: #", udec_(sampleCt), " bits=", ubin_(newValue), ", ", sdec(position))

CON { license }

{{

 -------------------------------------------------------------------------------------------------
  MIT License

  Copyright (c) 2023 Iron Sheep Productions, LLC

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
 =================================================================================================

}}