PropCAM 4-bit Parallel Driver

┌───────────────────────────────────────┐
│     PropCAM 4-bit Parallel Driver     │
│         Author: Phil Pilgrim          │
│(c) Copyright 2006 Bueno Systems, Inc. │
│   See end of file for terms of use.   │
└───────────────────────────────────────┘

This is a 4-bit parallel driver for the Parallax PropCAM. It interfaces the Kodak KAC9630
to the P8X32A Propeller chip via the sensor's four most significant data outputs.

Revision History

2006.07.17: v0.1 Alpha release.
2013.09.23: v1.0 Initial release

Contact Information

Phil Pilgrim: propeller@phipi.com

Introduction

This driver interfaces the PropCAM's KAC9630 image sensor to the Parallax P8X32A Propeller chip via the sensor's D7..D4 data pins.

Data from the sensor is stored in a designated grayscale buffer, packed two pixels per byte. From here it can be dispayed on a video monitor and/or processed for things like motion detection, sizing, sorting, pattern recognition, etc.

This object launches two additional cogs, which are used for image acquisition. In continuous acquisition modes it launches a third cog for scheduling and performing the acquisitions. It also provides the timing and user interface required for the camera's various operating modes.

External Connections

The PropCAM-DB, when used with this object, is plug-compatible with the Parallax Propeller Backpack (#28327). When used with other Propeller boards, connect as follows:
                                Top View    
                    ┌─────────────────────────────┐
                    │                             │
                    │                             │
               n/c ┼──• •─── n/c   +3.3V        │
               P0  ┼──• •─── P1      ┬          │
               P2  ┼──• •─── P3       4.7K     │
              SCL  ┼──• •─────────────┻──── SDA │
            VSYNC  ┼──• •─── MCLK (10 MHz)      │
               Gnd ┼──• •─── +3.3V              │
                    │                             │
                    │                             │
                    │                             │
                    │                             │
                    │                             │
                    └─────────────────────────────┘
If the Propeller module does not provide the required pull-up on SDA, you can solder a jumper across the PropCAM's J2 through-holes to deploy its onboard 4.7K pull-up. NOTE: Only P3..P0 can be used for parallel data from the KAC9630 sensor. If those pins are not available, use one of the serial drivers instead.

Constants

Fixed Values

Fixed characteristics of the sensor and of this driver oject.

Parameter Array

Index names for parameter array passed to the start method.

Start Routine Args

Constants for setting argument to start method

Exposure Type Names

Constants for setting EXP_TYPE

Acquisition Mask Names

Constants for calling acquire

Instance Variables


SOURCE CODE...
  long  Evens[6], Odds[6], EvenSum, OddSum, Exp100
  long  Stack[64]
  word  GrayBufAddr, ParamsAddr
  word  Begin, Skip, Width, TakeItEven, TakeItOdd
  byte  OddCog, EvenCog, LoopCog, TakeIt, AcqMode, Started, Lock
  byte  Scl, Sda, Vsync, Mclk


Public Spin Methods


start(mode, pins, params)

Start the image capture object. Starts two additional cogs, plus a third if CONTINUOUS mode is selected.

Parameters:
mode: one of SNAPSHOT, TRIGGERED, CONTINUOUS, TIMED, or SYNCED.
pins: pointer to a byte array containing pin numbers for Scl, Sda, Vsync, Mclk, Data, and HSync, in that order.
params: the address of a 10-word parameter block. (See Parameter Array in CONstants section.)
Return: true on success; false on failure..
Example: success := img.start(img#CONTINUOUS, @PinList, @ParamList)
Start the image capture in CONTINUOUS mode (starts 3 cogs), using pins in byte array PinList,
and parameters in word array ParamList.

SOURCE CODE...
PUB start(mode, pins, params) : retval | exp

  stop
  AcqMode := mode
  bytemove(@Scl, pins, 4)
  if mode <> SNAPSHOT
    if LoopCog := cognew(do_loop(params), @Stack) + 1
      retval := true
    else
      retval := false
  else
    retval := _start(params)
  if retval
    waitcnt(cnt + clkfreq >> 3)


stop

Stop the image capture object.

Return: true if object had been Started; false if there was nothing to stop.
Example: success := img.stop
Stop the image capture object, and assign result to variable success.

SOURCE CODE...
PUB stop

  if Started
    if LoopCog
      cogstop(LoopCog - 1)
      LoopCog~
    if EvenCog
      cogstop(EvenCog - 1)
      EvenCog~
    if OddCog
      cogstop(OddCog - 1)
      OddCog~
    clear_buf
    ctra~
    dira~
    Started~
    if Lock
      lockret(Lock - 1)
    return true
  else
    return false


set_exp(new_exp_type, new_exp_time, new_gain, new_target)

Set exposure parameters.

Parameters:
new_exp_type: the type of exposure control (FIXED, AUTOEXP, AUTOGAIN, or AUTOBOTH)
new_exp_time: exposure time in tens of microseconds (20 - 2047)
new_gain: sensor gain (0 -31)
new_target: target average pixel value (normalized to 0-15), times 100.
Return: none
Example: set_exp(cam#AUTOGAIN, 1667, 15, 800)
Set to operate with automatic gain control, a fixed exposure time of 1/60th second (16670 usec), a starting gain of 15, and a target average pixel value of 8.00 out of 15.00.

SOURCE CODE...
PUB set_exp(new_exp_type, new_exp_time, new_gain, new_target)

  repeat while lockset(Lock - 1)
  word[ParamsAddr][EXP_TYPE] := new_exp_type #> FIXED <# AUTOBOTH
  word[ParamsAddr][EXP_TIME] := new_exp_time #> MIN_EXP <# MAX_EXP
  word[ParamsAddr][GAIN] := new_gain #> MIN_GAIN <# MAX_GAIN
  word[ParamsAddr][TARGET] := new_target #> 0 <# 1500
  lockclr(Lock - 1)


acquire(take)

Acquire an image from the PropCAM and write it to memory.

Parameters:
take: a bit-mapped parameter that determines how the image is acquired.
(See bit definitions in Acquisition Mask Names in CONstants section.)
Return: true when acquisition is complete; false if object was never Started.
Example: success := img.acquire(img#GRAB)
Grab a single frame (both even and odd lines) and store into the grayscale buffer. Save true or false in variable success.

SOURCE CODE...
PUB acquire(take) | dummy

  if not Started
    return false
  if AcqMode == SNAPSHOT
    _acquire(0, take)
    return true
  else
    TakeIt := take
    repeat while TakeIt & 3
    return true


Private Spin Methods


do_loop(params)

Operate PropCAM in CONTINUOUS mode as a separate cog.

Parameters:
params: same as passed to start
Return: none. Starts as new cog.

SOURCE CODE...
PRI do_loop(params) | timer, time0, sync_loc, pll, take

  case AcqMode
    SYNCED:
      sync_loc := word[params][SYNC_ADDR]
      wait_sync(sync_loc, 1)
      wait_sync(sync_loc, 0)
      time0 := cnt
      wait_sync(sync_loc, 1)
      time0 := (cnt - time0) << 1
      
    CONTINUOUS:
      time0~
      
    TIMED:
      time0 := word[params][TIME_INTERVAL] << 16 ~> 16
      if time0 < 0
        time0 := clkfreq / (||time0 <# 30)
      else
        time0 *= clkfreq
                  
  if _start(params)
    timer := cnt
    repeat
      if time0
        waitcnt(timer += time0)
      take := TakeIt | TakeIt >> 4
      pll := _acquire(sync_loc, take)
      if (take)
        TakeIt &= !GRAB
      if AcqMode == SYNCED
        timer += pll * time0 >> 6
        time0 += pll * 256


_start(params)

Low-level start method.

Parameters:
params: same as passed to start.
Return: true on success; false on failure.

SOURCE CODE...
PRI _start(params) | height, i, buf_addr, left, top

  ParamsAddr := params
  left := word[params][LEFT_PIX] & $FFF8
  top := word[params][TOP_PIX]
  GrayBufAddr := word[params][GRAY_BUF_ADDR]
  Width := word[GrayBufAddr][1] & $FFF8
  height := word[GrayBufAddr][0]
  if left + 128 > Width or top + 96 > height
    return false
  GrayBufAddr += 4 
  Skip :=  Width - 64
  Begin := GrayBufAddr + (top * Width + left) >> 1

  dira := 1 << Mclk | 1 << Vsync | 1 << Scl
  frqa := 1 << 29
  ctra := %00100 << 26 | Mclk

  clear_buf

  Evens[0] := @Exp100
  Evens[1] := constant(1344 + 378)
  Evens[2] := Skip
  Evens[3] := @TakeItEven
  Evens[4] := 1 << Vsync
  Evens[5] := @EvenSum
  
  Odds[0] := @Exp100
  Odds[1] := constant(2688 + 378)
  Odds[2] := Skip
  Odds[3] := @TakeItOdd
  Odds[4] := 1 << Vsync
  Odds[5] := @OddSum

  Started~~
  if EvenCog := cognew(@entry, @Evens) + 1 and OddCog := cognew(@entry, @Odds) + 1 and Lock := locknew + 1
    _config(1, %0000_0101)
    '_config(1, %0100_0001)
    _config(8, $80) 
  else
    stop
  return Started


clear_buf

Clear the gray-level acquisition buffer to all black.

Return: none.

SOURCE CODE...
PRI clear_buf | i

  return

  repeat i from 0 to 95
    longfill(Begin + (Width >> 1) * i, 0, 16)


wait_sync(sync_loc, state)

Wait for sync in overlay driver to equal state. (Sync alternates on every vertical sync.)

Parameters:
sync_loc: address of the overlay driver's sync byte.
state: sync state.
Return: returns after sync state == state.

SOURCE CODE...
PRI wait_sync(sync_loc, state)

  repeat while (byte[sync_loc] <> 0) ^ (state <> 0) 


_acquire(sync_loc, now)

Internal acquisition method, called by acquire and by do_loop.

Parameters:
sync_loc: address of image overlay sync byte.
now: lower four bits defined by Acquisition Mask in CONstants section.

SOURCE CODE...
PRI _acquire(sync_loc, now) : sync |  avgpix, exp, sens, targ

  TakeItEven := (Begin + ((WIDTH / PIXELS_PER_LONG) << 2) & (now & EVEN_TO_ODD <> 0)) & (now & GRAB_EVEN <> 0)
  TakeItOdd := (Begin + ((WIDTH / PIXELS_PER_LONG) << 2) & (now & ODD_TO_EVEN == 0)) & (now & GRAB_ODD <> 0)
  exp := word[ParamsAddr][EXP_TIME] #> MIN_EXP <# MAX_EXP
  Exp100 := exp * 800
  sens := word[ParamsAddr][GAIN] #> MIN_GAIN <# MAX_GAIN
  _config(2, sens)
  _config(3, exp & $FF)
  _config(5, exp >> 8)
  sync := 0
  outa[Vsync]~~
  waitcnt(cnt + 10000)
  outa[Vsync]~
  repeat while (TakeItEven or TakeItOdd)
  if byte[sync_loc]
    sync := 1
  avgpix := (EvenSum + OddSum) * 100 / constant(SAMPLES_PER_SUM * PIXEL_DEPTH / 16)
  word[ParamsAddr][AVG_PIX] := avgpix <# 1500

  repeat while lockset(Lock - 1)
  targ := word[ParamsAddr][TARGET]
  case word[ParamsAddr][EXP_TYPE] #> FIXED <# AUTOBOTH
  
    AUTOEXP:
      exp := (exp * (90 + 10 * targ / (avgpix + 1)) / 100) #> MIN_EXP <# MAX_EXP
      word[ParamsAddr][EXP_TIME] := exp
      
    AUTOGAIN:
      if avgpix < targ * 94 / 100
        sens := sens + 1 <# $1f
      elseif avgpix > targ * 106 / 100
        sens := sens - 1 #> 0
      word[ParamsAddr][GAIN] := sens
        
    AUTOBOTH:
      if avgpix < targ * 94 / 100 and (sens < $0f or exp == MAX_EXP)
        sens := sens + 1 <# 31
      elseif avgpix > targ * 108 / 100 and (sens > $0f or exp == MIN_EXP)
        sens := sens - 1 #> 0
      else
        exp := (exp * (90 + 10 * targ / (avgpix + 1)) / 100) #> MIN_EXP <# MAX_EXP
      word[ParamsAddr][EXP_TIME] := exp
      word[ParamsAddr][GAIN] := sens

  lockclr(Lock - 1)
        
  if byte[sync_loc]
    sync |= 2
  case sync
    0, 1: sync := -1
    2:    sync := 0
    3:    sync := 1

  return sync


_config(register, data)

Write configuration information to sensor chip register.

Parameters:
register: sensor chip's register address.
data: byte to write in register.
Return: none

SOURCE CODE...
PRI _config(register, data)

  outa[Scl]~~
  dira[Sda]~
  outa[Sda]~
  dira[Sda]~~
  outa[Scl]~
  _write($88)
  _write(register)
  _write(data)
  dira[Sda]~~
  outa[Scl]~~
  dira[Sda]~


_write(data)

Low-level I2C write method.

Parameters:
data: byte to write to I2C

SOURCE CODE...
PRI _write(data)

  repeat 8
    dira[Sda] := data & $80 == 0
    outa[Scl]~~
    data <<= 1
    outa[Scl]~
  dira[Sda]~
  outa[Scl]~~
  repeat while ina[Sda]
  outa[Scl]~


PASM Code


SOURCE CODE...
entry         mov       par_ptr,par
              rdlong    exp_100,par_ptr
              add       par_ptr,#4
              rdlong    init_wait,par_ptr
              add       par_ptr,#4
              rdlong    vskip,par_ptr
              add       par_ptr,#4
              rdlong    snap,par_ptr
              add       par_ptr,#4
              rdlong    _vsync,par_ptr
              add       par_ptr,#4
              rdlong    sumaddr,par_ptr

:frame        waitpne   _vsync,_vsync
              waitpeq   _vsync,_vsync
              mov       time,cnt
              rdlong    _time,exp_100
              add       time,_time
              add       time,init_wait
              rdword    snapping,snap
              wrword    $,snap
              mov       ptr,snapping
              mov       line_ctr,#ROWS_PER_FRAME / 2
              mov       pixsum,#0
              
:line         waitcnt   time,interline

              movi      line_buf+0,ina
              shr       line_buf+0,#4
              movi      line_buf+0,ina
              shr       line_buf+0,#4
              movi      line_buf+0,ina
              shr       line_buf+0,#4
              movi      line_buf+0,ina
              shr       line_buf+0,#11
              
              movi      line_buf+1,ina
              shr       line_buf+1,#4
              movi      line_buf+1,ina
              shr       line_buf+1,#4
              movi      line_buf+1,ina
              shr       line_buf+1,#4
              movi      line_buf+1,ina
              shl       line_buf+1,#5
              
              movi      line_buf+2,ina
              shr       line_buf+2,#4
              movi      line_buf+2,ina
              shr       line_buf+2,#4
              movi      line_buf+2,ina
              shr       line_buf+2,#4
              movi      line_buf+2,ina
              shr       line_buf+2,#11
              
              movi      line_buf+3,ina
              shr       line_buf+3,#4
              movi      line_buf+3,ina
              shr       line_buf+3,#4
              movi      line_buf+3,ina
              shr       line_buf+3,#4
              movi      line_buf+3,ina
              shl       line_buf+3,#5
              
              movi      line_buf+4,ina
              shr       line_buf+4,#4
              movi      line_buf+4,ina
              shr       line_buf+4,#4
              movi      line_buf+4,ina
              shr       line_buf+4,#4
              movi      line_buf+4,ina
              shr       line_buf+4,#11
              
              movi      line_buf+5,ina
              shr       line_buf+5,#4
              movi      line_buf+5,ina
              shr       line_buf+5,#4
              movi      line_buf+5,ina
              shr       line_buf+5,#4
              movi      line_buf+5,ina
              shl       line_buf+5,#5
              
              movi      line_buf+6,ina
              shr       line_buf+6,#4
              movi      line_buf+6,ina
              shr       line_buf+6,#4
              movi      line_buf+6,ina
              shr       line_buf+6,#4
              movi      line_buf+6,ina
              shr       line_buf+6,#11
              
              movi      line_buf+7,ina
              shr       line_buf+7,#4
              movi      line_buf+7,ina
              shr       line_buf+7,#4
              movi      line_buf+7,ina
              shr       line_buf+7,#4
              movi      line_buf+7,ina
              shl       line_buf+7,#5
              
              movi      line_buf+8,ina
              shr       line_buf+8,#4
              movi      line_buf+8,ina
              shr       line_buf+8,#4
              movi      line_buf+8,ina
              shr       line_buf+8,#4
              movi      line_buf+8,ina
              shr       line_buf+8,#11
              
              movi      line_buf+9,ina
              shr       line_buf+9,#4
              movi      line_buf+9,ina
              shr       line_buf+9,#4
              movi      line_buf+9,ina
              shr       line_buf+9,#4
              movi      line_buf+9,ina
              shl       line_buf+9,#5
              
              movi      line_buf+10,ina
              shr       line_buf+10,#4
              movi      line_buf+10,ina
              shr       line_buf+10,#4
              movi      line_buf+10,ina
              shr       line_buf+10,#4
              movi      line_buf+10,ina
              shr       line_buf+10,#11
              
              movi      line_buf+11,ina
              shr       line_buf+11,#4
              movi      line_buf+11,ina
              shr       line_buf+11,#4
              movi      line_buf+11,ina
              shr       line_buf+11,#4
              movi      line_buf+11,ina
              shl       line_buf+11,#5
              
              movi      line_buf+12,ina
              shr       line_buf+12,#4
              movi      line_buf+12,ina
              shr       line_buf+12,#4
              movi      line_buf+12,ina
              shr       line_buf+12,#4
              movi      line_buf+12,ina
              shr       line_buf+12,#11
              
              movi      line_buf+13,ina
              shr       line_buf+13,#4
              movi      line_buf+13,ina
              shr       line_buf+13,#4
              movi      line_buf+13,ina
              shr       line_buf+13,#4
              movi      line_buf+13,ina
              shl       line_buf+13,#5
              
              movi      line_buf+14,ina
              shr       line_buf+14,#4
              movi      line_buf+14,ina
              shr       line_buf+14,#4
              movi      line_buf+14,ina
              shr       line_buf+14,#4
              movi      line_buf+14,ina
              shr       line_buf+14,#11
              
              movi      line_buf+15,ina
              shr       line_buf+15,#4
              movi      line_buf+15,ina
              shr       line_buf+15,#4
              movi      line_buf+15,ina
              shr       line_buf+15,#4
              movi      line_buf+15,ina
              shl       line_buf+15,#5
              
              movi      line_buf+16,ina
              shr       line_buf+16,#4
              movi      line_buf+16,ina
              shr       line_buf+16,#4
              movi      line_buf+16,ina
              shr       line_buf+16,#4
              movi      line_buf+16,ina
              shr       line_buf+16,#11
              
              movi      line_buf+17,ina
              shr       line_buf+17,#4
              movi      line_buf+17,ina
              shr       line_buf+17,#4
              movi      line_buf+17,ina
              shr       line_buf+17,#4
              movi      line_buf+17,ina
              shl       line_buf+17,#5
              
              movi      line_buf+18,ina
              shr       line_buf+18,#4
              movi      line_buf+18,ina
              shr       line_buf+18,#4
              movi      line_buf+18,ina
              shr       line_buf+18,#4
              movi      line_buf+18,ina
              shr       line_buf+18,#11
              
              movi      line_buf+19,ina
              shr       line_buf+19,#4
              movi      line_buf+19,ina
              shr       line_buf+19,#4
              movi      line_buf+19,ina
              shr       line_buf+19,#4
              movi      line_buf+19,ina
              shl       line_buf+19,#5
              
              movi      line_buf+20,ina
              shr       line_buf+20,#4
              movi      line_buf+20,ina
              shr       line_buf+20,#4
              movi      line_buf+20,ina
              shr       line_buf+20,#4
              movi      line_buf+20,ina
              shr       line_buf+20,#11
              
              movi      line_buf+21,ina
              shr       line_buf+21,#4
              movi      line_buf+21,ina
              shr       line_buf+21,#4
              movi      line_buf+21,ina
              shr       line_buf+21,#4
              movi      line_buf+21,ina
              shl       line_buf+21,#5
              
              movi      line_buf+22,ina
              shr       line_buf+22,#4
              movi      line_buf+22,ina
              shr       line_buf+22,#4
              movi      line_buf+22,ina
              shr       line_buf+22,#4
              movi      line_buf+22,ina
              shr       line_buf+22,#11
              
              movi      line_buf+23,ina
              shr       line_buf+23,#4
              movi      line_buf+23,ina
              shr       line_buf+23,#4
              movi      line_buf+23,ina
              shr       line_buf+23,#4
              movi      line_buf+23,ina
              shl       line_buf+23,#5
              
              movi      line_buf+24,ina
              shr       line_buf+24,#4
              movi      line_buf+24,ina
              shr       line_buf+24,#4
              movi      line_buf+24,ina
              shr       line_buf+24,#4
              movi      line_buf+24,ina
              shr       line_buf+24,#11
              
              movi      line_buf+25,ina
              shr       line_buf+25,#4
              movi      line_buf+25,ina
              shr       line_buf+25,#4
              movi      line_buf+25,ina
              shr       line_buf+25,#4
              movi      line_buf+25,ina
              shl       line_buf+25,#5
              
              movi      line_buf+26,ina
              shr       line_buf+26,#4
              movi      line_buf+26,ina
              shr       line_buf+26,#4
              movi      line_buf+26,ina
              shr       line_buf+26,#4
              movi      line_buf+26,ina
              shr       line_buf+26,#11
              
              movi      line_buf+27,ina
              shr       line_buf+27,#4
              movi      line_buf+27,ina
              shr       line_buf+27,#4
              movi      line_buf+27,ina
              shr       line_buf+27,#4
              movi      line_buf+27,ina
              shl       line_buf+27,#5
              
              movi      line_buf+28,ina
              shr       line_buf+28,#4
              movi      line_buf+28,ina
              shr       line_buf+28,#4
              movi      line_buf+28,ina
              shr       line_buf+28,#4
              movi      line_buf+28,ina
              shr       line_buf+28,#11
              
              movi      line_buf+29,ina
              shr       line_buf+29,#4
              movi      line_buf+29,ina
              shr       line_buf+29,#4
              movi      line_buf+29,ina
              shr       line_buf+29,#4
              movi      line_buf+29,ina
              shl       line_buf+29,#5
              
              movi      line_buf+30,ina
              shr       line_buf+30,#4
              movi      line_buf+30,ina
              shr       line_buf+30,#4
              movi      line_buf+30,ina
              shr       line_buf+30,#4
              movi      line_buf+30,ina
              shr       line_buf+30,#11
              
              movi      line_buf+31,ina
              shr       line_buf+31,#4
              movi      line_buf+31,ina
              shr       line_buf+31,#4
              movi      line_buf+31,ina
              shr       line_buf+31,#4
              movi      line_buf+31,ina
              shl       line_buf+31,#5

              movs      :slice,#line_buf
              movs      :second,#line_buf+1
              mov       n,#LONGS_PER_ROW
              
:slice        mov       x,0-0
              and       x,_0x0000ffff
              
:second       mov       y,0-0
              and       y,_0xffff0000
              or        x,y 
              test      snapping,snapping wz
if_nz         wrlong    x,ptr
              and       x,#$0f
              add       pixsum,x

              add       ptr,#4
              add       :slice,#2
              add       :second,#2

              djnz      n,#:slice

:nxtline      add       ptr,vskip
              djnz      line_ctr,#:line 

              wrlong    pixsum,sumaddr
              wrword    zero,snap
              jmp       #:frame
              
_0x0000ffff   long      $0000ffff
_0xffff0000   long      $ffff0000
zero          long      0

interline     long      2688

line_buf      res       32
par_ptr       res       1
exp_100       res       1
sumaddr       res       1
pixsum        res       1
init_wait     res       1
vskip         res       1
_vsync        res       1
snap          res       1
snapping      res       1
line_ctr      res       1
x             res       1
y             res       1
n             res       1
ptr           res       1
time          res       1
_time         res       1


License

┌──────────────────────────────────────────────────────────────────────────────────────┐
│                            TERMS OF USE: MIT License                                 │                                                            
├──────────────────────────────────────────────────────────────────────────────────────┤
│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.                                         │
└──────────────────────────────────────────────────────────────────────────────────────┘