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thermal printer feed does not work properly, neither bitmap
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thermal printer feed does not work properly, neither bitmap

by einlagerfeuer on Fri Oct 27, 2017 5:24 pm

hello,

i just tested my mini thermal printer and found out these 2 issues, would be happy if you could help me solve them:

1) the test page prints out fine except the feed produces characters rather then just feeding the paper through the printer. it seems this occurs also on other functions, as the characters appear also on the top of the test page even with out feed being present (the characters are always the same "x(J")
2) the example sketch seems to print out ascii gibberish when trying to print the bitmap data

i am not sure which firmware my printer runs on, as i can not find any info about that other then "FW Version:1.00.48 NVT" - is this supposed to be the valid firmware? in the documentation and the sample sketches they usually contain just 3 numbers (e.g. 2.68)

thank you for you help!

IMG_3998.JPG
result of A_printertest
IMG_3998.JPG (84.35 KiB) Viewed 2310 times

IMG_3999.JPG
feed
IMG_3999.JPG (57.65 KiB) Viewed 2310 times

einlagerfeuer
 
Posts: 1
Joined: Fri Oct 27, 2017 4:59 pm

Re: thermal printer feed does not work properly, neither bit

by inonoob on Thu Nov 02, 2017 3:39 pm

Hey

I have the exact same issue as you described it. I dont't know what is wrong. I tried to fix it in the Adafruit_thermal.py but no luck so far. If I do the math 1 * 100 + 48 = 148 which I should put in the Adafruit_thermal.py but no changes either.

The printer is hooked to a Raspberry pi 2.

Maybe some else has the same issue.

my model: BT-2
Boot Version: 1.01.02
FW Version: 1.00.48 NVT
CG Version 1.00.2
Build date: Apr 19 2017
Build time: 23.18:41

Regards

Ino

inonoob
 
Posts: 1
Joined: Thu Nov 02, 2017 3:35 pm

Re: thermal printer feed does not work properly, neither bit

by PixelDemon on Thu Apr 05, 2018 9:13 am

Hey all,

i have the exact same problem with "FW Version:1.00.48 NVT". Printing bitmap results in rubbish, linefeed prints "x(J".
Have you found a solution in the meantime? Can Adafruit staff say something about that?

Thanks!

PixelDemon
 
Posts: 1
Joined: Thu Apr 05, 2018 9:11 am

Re: thermal printer feed does not work properly, neither bit

by Ramondes on Sat May 12, 2018 4:06 pm

Hello dear all,
I am facing the same problems. I would be glad if someone of the cracks could guide me out. My setup:
Arduino Mega
Adafruit mini thermal printer
The library given by Adafruit

Ramondes
 
Posts: 1
Joined: Sat May 12, 2018 4:02 pm

Re: thermal printer feed does not work properly, neither bit

by costelano on Mon Aug 13, 2018 11:12 am

The library is not adapted to the printer. To get rid of "x(J" you have to modify the Adafruit_Thermal.cpp from library.
Locate
Code: Select all | TOGGLE FULL SIZE
void Adafruit_Thermal::begin

and before closing bracket "}" insert the reset command again:
Code: Select all | TOGGLE FULL SIZE
reset();

This problem is caused by that wrong commands for setting the printer (DTR, Density, etc)

If you need other printer functions you have to modify the library according to your printer Commands manual.

costelano
 
Posts: 1
Joined: Mon Aug 13, 2018 11:03 am

Re: thermal printer feed does not work properly, neither bit

by adafruit2 on Sun Aug 19, 2018 2:28 pm

did this get resolved? all the printers have slight variations - for raspberry pi please use the 'printer driver' technique, that works best we've found

adafruit2
Site Admin
 
Posts: 19270
Joined: Fri Mar 11, 2005 7:36 pm

Re: thermal printer feed does not work properly, neither bit

by lcorrea on Thu Oct 25, 2018 10:57 am

Hi, to solve this try to remove the following lines from Adafruit_Thermal.cpp

in void Adafruit_Thermal::begin(uint8_t heatTime) {
.
.
.

writeBytes(11, heatTime, 40); // Heating dots, heat time, heat interval

and

writeBytes(ASCII_DC2, '#', (printBreakTime << 5) | printDensity);

Put a comment in front of theses lines

// writeBytes(11, heatTime, 40); // Heating dots, heat time, heat interval

and

//writeBytes(ASCII_DC2, '#', (printBreakTime << 5) | printDensity);

With theses changes it would be fine.

lcorrea
 
Posts: 1
Joined: Thu Oct 25, 2018 10:54 am

Re: thermal printer feed does not work properly, neither bit

by Va_Le on Mon Aug 26, 2019 3:32 am

Hi there!

I have the same "x(J"-problem here; the printer prints that before anything..

I am using a Raspberry PI3B+ and did all the steps in the "Internet of Things Printer for Raspberry Pi"-Tutorial.

See also the Images attached:

1.jpg
Modified "printertest.py" from the Tutorials original printertest
1.jpg (525.46 KiB) Viewed 924 times


2.jpg
Printer-Selftest. Printed at holding the feed-button at the same time turning on the power.
2.jpg (733.07 KiB) Viewed 924 times



Any ideas / help?

Va_Le
 
Posts: 3
Joined: Sat Aug 24, 2019 6:01 pm

Re: thermal printer feed does not work properly, neither bit

by Va_Le on Mon Aug 26, 2019 5:38 am

I think my problem is anywhere inside the Adafruit_Thermal.py

here it is:

Code: Select all | TOGGLE FULL SIZE
#*************************************************************************
# This is a Python library for the Adafruit Thermal Printer.
# Pick one up at --> http://www.adafruit.com/products/597
# These printers use TTL serial to communicate, 2 pins are required.
# IMPORTANT: On 3.3V systems (e.g. Raspberry Pi), use a 10K resistor on
# the RX pin (TX on the printer, green wire), or simply leave unconnected.
#
# Adafruit invests time and resources providing this open source code.
# Please support Adafruit and open-source hardware by purchasing products
# from Adafruit!
#
# Written by Limor Fried/Ladyada for Adafruit Industries.
# Python port by Phil Burgess for Adafruit Industries.
# MIT license, all text above must be included in any redistribution.
#*************************************************************************

# This is pretty much a 1:1 direct Python port of the Adafruit_Thermal
# library for Arduino.  All methods use the same naming conventions as the
# Arduino library, with only slight changes in parameter behavior where
# needed.  This should simplify porting existing Adafruit_Thermal-based
# printer projects to Raspberry Pi, BeagleBone, etc.  See printertest.py
# for an example.
#
# One significant change is the addition of the printImage() function,
# which ties this to the Python Imaging Library and opens the door to a
# lot of cool graphical stuff!
#
# TO DO:
# - Might use standard ConfigParser library to put thermal calibration
#   settings in a global configuration file (rather than in the library).
# - Make this use proper Python library installation procedure.
# - Trap errors properly.  Some stuff just falls through right now.
# - Add docstrings throughout!

# Python 2.X code using the library usu. needs to include the next line:
from __future__ import print_function
from serial import Serial
import time
import sys

class Adafruit_Thermal(Serial):

   resumeTime      =   0.0
   byteTime        =   0.0
   dotPrintTime    =   0.0
   dotFeedTime     =   0.0
   prevByte        =  '\n'
   column          =     0
   maxColumn       =    32
   charHeight      =    24
   lineSpacing     =     8
   barcodeHeight   =    50
   printMode       =     0
   defaultHeatTime =   120
   firmwareVersion =   268
   writeToStdout   = False

   def __init__(self, *args, **kwargs):
      # NEW BEHAVIOR: if no parameters given, output is written
      # to stdout, to be piped through 'lp -o raw' (old behavior
      # was to use default port & baud rate).
      baudrate = 19200
      if len(args) == 0:
         self.writeToStdout = True
      if len(args) == 1:
         # If only port is passed, use default baud rate.
         args = [ args[0], baudrate ]
      elif len(args) == 2:
         # If both passed, use those values.
         baudrate = args[1]

      # Firmware is assumed version 2.68.  Can override this
      # with the 'firmware=X' argument, where X is the major
      # version number * 100 + the minor version number (e.g.
      # pass "firmware=264" for version 2.64.
      self.firmwareVersion = kwargs.get('firmware', 268)

      if self.writeToStdout is False:
         # Calculate time to issue one byte to the printer.
         # 11 bits (not 8) to accommodate idle, start and
         # stop bits.  Idle time might be unnecessary, but
         # erring on side of caution here.
         self.byteTime = 11.0 / float(baudrate)

         Serial.__init__(self, *args, **kwargs)

         # Remainder of this method was previously in begin()

         # The printer can't start receiving data immediately
         # upon power up -- it needs a moment to cold boot
         # and initialize.  Allow at least 1/2 sec of uptime
         # before printer can receive data.
         self.timeoutSet(0.5)

         self.wake()
         self.reset()

         # Description of print settings from p. 23 of manual:
         # ESC 7 n1 n2 n3 Setting Control Parameter Command
         # Decimal: 27 55 n1 n2 n3
         # max heating dots, heating time, heating interval
         # n1 = 0-255 Max heat dots, Unit (8dots), Default: 7 (64 dots)
         # n2 = 3-255 Heating time, Unit (10us), Default: 80 (800us)
         # n3 = 0-255 Heating interval, Unit (10us), Default: 2 (20us)
         # The more max heating dots, the more peak current
         # will cost when printing, the faster printing speed.
         # The max heating dots is 8*(n1+1).  The more heating
         # time, the more density, but the slower printing
         # speed.  If heating time is too short, blank page
         # may occur.  The more heating interval, the more
         # clear, but the slower printing speed.

         heatTime = kwargs.get('heattime', self.defaultHeatTime)
         self.writeBytes(
           27,       # Esc
           55,       # 7 (print settings)
           11,       # Heat dots
           heatTime, # Lib default
           40)       # Heat interval

         # Description of print density from p. 23 of manual:
         # DC2 # n Set printing density
         # Decimal: 18 35 n
         # D4..D0 of n is used to set the printing density.
         # Density is 50% + 5% * n(D4-D0) printing density.
         # D7..D5 of n is used to set the printing break time.
         # Break time is n(D7-D5)*250us.
         # (Unsure of default values -- not documented)

         printDensity   = 10 # 100%
         printBreakTime =  2 # 500 uS

         self.writeBytes(
           18, # DC2
           35, # Print density
           (printBreakTime << 5) | printDensity)
         self.dotPrintTime = 0.03
         self.dotFeedTime  = 0.0021
      else:
         self.reset() # Inits some vars

   # Because there's no flow control between the printer and computer,
   # special care must be taken to avoid overrunning the printer's
   # buffer.  Serial output is throttled based on serial speed as well
   # as an estimate of the device's print and feed rates (relatively
   # slow, being bound to moving parts and physical reality).  After
   # an operation is issued to the printer (e.g. bitmap print), a
   # timeout is set before which any other printer operations will be
   # suspended.  This is generally more efficient than using a delay
   # in that it allows the calling code to continue with other duties
   # (e.g. receiving or decoding an image) while the printer
   # physically completes the task.

   # Sets estimated completion time for a just-issued task.
   def timeoutSet(self, x):
      self.resumeTime = time.time() + x

   # Waits (if necessary) for the prior task to complete.
   def timeoutWait(self):
      if self.writeToStdout is False:
         while (time.time() - self.resumeTime) < 0: pass

   # Printer performance may vary based on the power supply voltage,
   # thickness of paper, phase of the moon and other seemingly random
   # variables.  This method sets the times (in microseconds) for the
   # paper to advance one vertical 'dot' when printing and feeding.
   # For example, in the default initialized state, normal-sized text
   # is 24 dots tall and the line spacing is 32 dots, so the time for
   # one line to be issued is approximately 24 * print time + 8 * feed
   # time.  The default print and feed times are based on a random
   # test unit, but as stated above your reality may be influenced by
   # many factors.  This lets you tweak the timing to avoid excessive
   # delays and/or overrunning the printer buffer.
   def setTimes(self, p, f):
      # Units are in microseconds for
      # compatibility with Arduino library
      self.dotPrintTime = p / 1000000.0
      self.dotFeedTime  = f / 1000000.0

   # 'Raw' byte-writing method
   def writeBytes(self, *args):
      if self.writeToStdout:
         for arg in args:
            sys.stdout.write(chr(arg))
      else:
         self.timeoutWait()
         self.timeoutSet(len(args) * self.byteTime)
         for arg in args:
            super(Adafruit_Thermal, self).write(chr(arg))

   # Override write() method to keep track of paper feed.
   def write(self, *data):
      for i in range(len(data)):
         c = data[i]
         if self.writeToStdout:
            sys.stdout.write(c)
            continue
         if c != 0x13:
            self.timeoutWait()
            super(Adafruit_Thermal, self).write(c)
            d = self.byteTime
            if ((c == '\n') or
                (self.column == self.maxColumn)):
               # Newline or wrap
               if self.prevByte == '\n':
                  # Feed line (blank)
                  d += ((self.charHeight +
                         self.lineSpacing) *
                        self.dotFeedTime)
               else:
                  # Text line
                  d += ((self.charHeight *
                         self.dotPrintTime) +
                        (self.lineSpacing *
                         self.dotFeedTime))
                  self.column = 0
                  # Treat wrap as newline
                  # on next pass
                  c = '\n'
            else:
               self.column += 1
            self.timeoutSet(d)
            self.prevByte = c

   # The bulk of this method was moved into __init__,
   # but this is left here for compatibility with older
   # code that might get ported directly from Arduino.
   
   def begin(self, heatTime=defaultHeatTime):
      self.writeBytes(
        27,       # Esc
        55,       # 7 (print settings)
        11,       # Heat dots
        heatTime,
        40)       # Heat interval

   def reset(self):
      self.writeBytes(27, 64) # Esc @ = init command
      self.prevByte      = '\n' # Treat as if prior line is blank
      self.column        =  0
      self.maxColumn     = 32
      self.charHeight    = 24
      self.lineSpacing   =  6
      self.barcodeHeight = 50
      if self.firmwareVersion >= 264:
         # Configure tab stops on recent printers
         self.writeBytes(27, 68)         # Set tab stops
         self.writeBytes( 4,  8, 12, 16) # every 4 columns,
         self.writeBytes(20, 24, 28,  0) # 0 is end-of-list.

   # Reset text formatting parameters.
   def setDefault(self):
      self.online()
      self.justify('L')
      self.inverseOff()
      self.doubleHeightOff()
      self.setLineHeight(30)
      self.boldOff()
      self.underlineOff()
      self.setBarcodeHeight(50)
      self.setSize('s')
      self.setCharset()
      self.setCodePage()

   def test(self):
      self.write("Hello world!")
      self.feed(2)

   def testPage(self):
      self.writeBytes(18, 84)
      self.timeoutSet(
        self.dotPrintTime * 24 * 26 +
        self.dotFeedTime * (6 * 26 + 30))

   def setBarcodeHeight(self, val=50):
      if val < 1: val = 1
      self.barcodeHeight = val
      self.writeBytes(29, 104, val)

   UPC_A   =  0
   UPC_E   =  1
   EAN13   =  2
   EAN8    =  3
   CODE39  =  4
   I25     =  5
   CODEBAR =  6
   CODE93  =  7
   CODE128 =  8
   CODE11  =  9
   MSI     = 10
   ITF     = 11
   CODABAR = 12

   def printBarcode(self, text, type):

      newDict = { # UPC codes & values for firmwareVersion >= 264
         self.UPC_A   : 65,
         self.UPC_E   : 66,
         self.EAN13   : 67,
         self.EAN8    : 68,
         self.CODE39  : 69,
         self.ITF     : 70,
         self.CODABAR : 71,
         self.CODE93  : 72,
         self.CODE128 : 73,
         self.I25     : -1, # NOT IN NEW FIRMWARE
         self.CODEBAR : -1,
         self.CODE11  : -1,
         self.MSI     : -1
      }
      oldDict = { # UPC codes & values for firmwareVersion < 264
         self.UPC_A   :  0,
         self.UPC_E   :  1,
         self.EAN13   :  2,
         self.EAN8    :  3,
         self.CODE39  :  4,
         self.I25     :  5,
         self.CODEBAR :  6,
         self.CODE93  :  7,
         self.CODE128 :  8,
         self.CODE11  :  9,
         self.MSI     : 10,
         self.ITF     : -1, # NOT IN OLD FIRMWARE
         self.CODABAR : -1
      }

      if self.firmwareVersion >= 264:
         n = newDict[type]
      else:
         n = oldDict[type]
      if n == -1: return
      self.feed(1) # Recent firmware requires this?
      self.writeBytes(
        29,  72, 2, # Print label below barcode
        29, 119, 3, # Barcode width
        29, 107, n) # Barcode type
      self.timeoutWait()
      self.timeoutSet((self.barcodeHeight + 40) * self.dotPrintTime)
      # Print string
      if self.firmwareVersion >= 264:
         # Recent firmware: write length byte + string sans NUL
         n = len(text)
         if n > 255: n = 255
         if self.writeToStdout:
            sys.stdout.write(chr(n))
            for i in range(n):
               sys.stdout.write(text[i])
         else:
            super(Adafruit_Thermal, self).write(chr(n))
            for i in range(n):
               super(Adafruit_Thermal,
                 self).write(text[i])
      else:
         # Older firmware: write string + NUL
         if self.writeToStdout:
            sys.stdout.write(text)
         else:
            super(Adafruit_Thermal, self).write(text)
      self.prevByte = '\n'

   # === Character commands ===

   INVERSE_MASK       = (1 << 1) # Not in 2.6.8 firmware (see inverseOn())
   UPDOWN_MASK        = (1 << 2)
   BOLD_MASK          = (1 << 3)
   DOUBLE_HEIGHT_MASK = (1 << 4)
   DOUBLE_WIDTH_MASK  = (1 << 5)
   STRIKE_MASK        = (1 << 6)

   def setPrintMode(self, mask):
      self.printMode |= mask
      self.writePrintMode()
      if self.printMode & self.DOUBLE_HEIGHT_MASK:
         self.charHeight = 48
      else:
         self.charHeight = 24
      if self.printMode & self.DOUBLE_WIDTH_MASK:
         self.maxColumn  = 16
      else:
         self.maxColumn  = 32

   def unsetPrintMode(self, mask):
      self.printMode &= ~mask
      self.writePrintMode()
      if self.printMode & self.DOUBLE_HEIGHT_MASK:
         self.charHeight = 48
      else:
         self.charHeight = 24
      if self.printMode & self.DOUBLE_WIDTH_MASK:
         self.maxColumn  = 16
      else:
         self.maxColumn  = 32

   def writePrintMode(self):
      self.writeBytes(27, 33, self.printMode)

   def normal(self):
      self.printMode = 0
      self.writePrintMode()

   def inverseOn(self):
      if self.firmwareVersion >= 268:
         self.writeBytes(29, 66, 1)
      else:
         self.setPrintMode(self.INVERSE_MASK)

   def inverseOff(self):
      if self.firmwareVersion >= 268:
         self.writeBytes(29, 66, 0)
      else:
         self.unsetPrintMode(self.INVERSE_MASK)

   def upsideDownOn(self):
      self.setPrintMode(self.UPDOWN_MASK)

   def upsideDownOff(self):
      self.unsetPrintMode(self.UPDOWN_MASK)

   def doubleHeightOn(self):
      self.setPrintMode(self.DOUBLE_HEIGHT_MASK)

   def doubleHeightOff(self):
      self.unsetPrintMode(self.DOUBLE_HEIGHT_MASK)

   def doubleWidthOn(self):
      self.setPrintMode(self.DOUBLE_WIDTH_MASK)

   def doubleWidthOff(self):
      self.unsetPrintMode(self.DOUBLE_WIDTH_MASK)

   def strikeOn(self):
      self.setPrintMode(self.STRIKE_MASK)

   def strikeOff(self):
      self.unsetPrintMode(self.STRIKE_MASK)

   def boldOn(self):
      self.setPrintMode(self.BOLD_MASK)

   def boldOff(self):
      self.unsetPrintMode(self.BOLD_MASK)

   def justify(self, value):
      c = value.upper()
      if   c == 'C':
         pos = 1
      elif c == 'R':
         pos = 2
      else:
         pos = 0
      self.writeBytes(0x1B, 0x61, pos)

   # Feeds by the specified number of lines
   def feed(self, x=1):
      if self.firmwareVersion >= 264:
         self.writeBytes(27, 100, x)
         self.timeoutSet(self.dotFeedTime * self.charHeight)
         self.prevByte = '\n'
         self.column   =    0

      else:
         # datasheet claims sending bytes 27, 100, <x> works,
         # but it feeds much more than that.  So, manually:
         while x > 0:
            self.write('\n')
            x -= 1

   # Feeds by the specified number of individual pixel rows
   def feedRows(self, rows):
      self.writeBytes(27, 74, rows)
      self.timeoutSet(rows * dotFeedTime)
      self.prevByte = '\n'
      self.column = 0

   def flush(self):
      self.writeBytes(12) # ASCII FF

   def setSize(self, value):
      c = value.upper()
      if c == 'L':   # Large: double width and height
         size            = 0x11
         self.charHeight = 48
         self.maxColumn  = 16
      elif c == 'M': # Medium: double height
         size            = 0x01
         self.charHeight = 48
         self.maxColumn  = 32
      else:          # Small: standard width and height
         size            = 0x00
         self.charHeight = 24
         self.maxColumn  = 32

      self.writeBytes(29, 33, size)
      prevByte = '\n' # Setting the size adds a linefeed

   # Underlines of different weights can be produced:
   # 0 - no underline
   # 1 - normal underline
   # 2 - thick underline
   def underlineOn(self, weight=1):
      if weight > 2: weight = 2
      self.writeBytes(27, 45, weight)

   def underlineOff(self):
      self.writeBytes(27, 45, 0)

   def printBitmap(self, w, h, bitmap, LaaT=False):
      rowBytes = (w + 7) / 8  # Round up to next byte boundary
      if rowBytes >= 48:
         rowBytesClipped = 48  # 384 pixels max width
      else:
         rowBytesClipped = rowBytes

      # if LaaT (line-at-a-time) is True, print bitmaps
      # scanline-at-a-time (rather than in chunks).
      # This tends to make for much cleaner printing
      # (no feed gaps) on large images...but has the
      # opposite effect on small images that would fit
      # in a single 'chunk', so use carefully!
      if LaaT: maxChunkHeight = 1
      else:    maxChunkHeight = 255

      i = 0
      for rowStart in range(0, h, maxChunkHeight):
         chunkHeight = h - rowStart
         if chunkHeight > maxChunkHeight:
            chunkHeight = maxChunkHeight

         # Timeout wait happens here
         self.writeBytes(18, 42, chunkHeight, rowBytesClipped)

         for y in range(chunkHeight):
            for x in range(rowBytesClipped):
               if self.writeToStdout:
                  sys.stdout.write(
                    chr(bitmap[i]))
               else:
                  super(Adafruit_Thermal,
                    self).write(chr(bitmap[i]))
               i += 1
            i += rowBytes - rowBytesClipped
         self.timeoutSet(chunkHeight * self.dotPrintTime)

      self.prevByte = '\n'

   # Print Image.  Requires Python Imaging Library.  This is
   # specific to the Python port and not present in the Arduino
   # library.  Image will be cropped to 384 pixels width if
   # necessary, and converted to 1-bit w/diffusion dithering.
   # For any other behavior (scale, B&W threshold, etc.), use
   # the Imaging Library to perform such operations before
   # passing the result to this function.
   def printImage(self, image, LaaT=False):
      from PIL import Image

      if image.mode != '1':
         image = image.convert('1')

      width  = image.size[0]
      height = image.size[1]
      if width > 384:
         width = 384
      rowBytes = (width + 7) / 8
      bitmap   = bytearray(rowBytes * height)
      pixels   = image.load()

      for y in range(height):
         n = y * rowBytes
         x = 0
         for b in range(rowBytes):
            sum = 0
            bit = 128
            while bit > 0:
               if x >= width: break
               if pixels[x, y] == 0:
                  sum |= bit
               x    += 1
               bit >>= 1
            bitmap[n + b] = sum

      self.printBitmap(width, height, bitmap, LaaT)

   # Take the printer offline. Print commands sent after this
   # will be ignored until 'online' is called.
   def offline(self):
      self.writeBytes(27, 61, 0)

   # Take the printer online. Subsequent print commands will be obeyed.
   def online(self):
      self.writeBytes(27, 61, 1)

   # Put the printer into a low-energy state immediately.
   def sleep(self):
      self.sleepAfter(1) # Can't be 0, that means "don't sleep"

   # Put the printer into a low-energy state after
   # the given number of seconds.
   def sleepAfter(self, seconds):
      if self.firmwareVersion >= 264:
         self.writeBytes(27, 56, seconds & 0xFF, seconds >> 8)
      else:
         self.writeBytes(27, 56, seconds)

   def wake(self):
      self.timeoutSet(0)
      self.writeBytes(255)
      if self.firmwareVersion >= 264:
         time.sleep(0.05)            # 50 ms
         self.writeBytes(27, 118, 0) # Sleep off (important!)
      else:
         for i in range(10):
            self.writeBytes(27)
            self.timeoutSet(0.1)

   # Empty method, included for compatibility
   # with existing code ported from Arduino.
   def listen(self):
      pass

   # Check the status of the paper using the printers self reporting
   # ability. Doesn't match the datasheet...
   # Returns True for paper, False for no paper.
   def hasPaper(self):
      if self.firmwareVersion >= 264:
         self.writeBytes(27, 118, 0)
      else:
         self.writeBytes(29, 114, 0)
      # Bit 2 of response seems to be paper status
      stat = ord(self.read(1)) & 0b00000100
      # If set, we have paper; if clear, no paper
      return stat == 0

   def setLineHeight(self, val=32):
      if val < 24: val = 24
      self.lineSpacing = val - 24

      # The printer doesn't take into account the current text
      # height when setting line height, making this more akin
      # to inter-line spacing.  Default line spacing is 32
      # (char height of 24, line spacing of 8).
      self.writeBytes(27, 51, val)

   CHARSET_USA          =  0
   CHARSET_FRANCE       =  1
   CHARSET_GERMANY      =  2
   CHARSET_UK           =  3
   CHARSET_DENMARK1     =  4
   CHARSET_SWEDEN       =  5
   CHARSET_ITALY        =  6
   CHARSET_SPAIN1       =  7
   CHARSET_JAPAN        =  8
   CHARSET_NORWAY       =  9
   CHARSET_DENMARK2     = 10
   CHARSET_SPAIN2       = 11
   CHARSET_LATINAMERICA = 12
   CHARSET_KOREA        = 13
   CHARSET_SLOVENIA     = 14
   CHARSET_CROATIA      = 14
   CHARSET_CHINA        = 15

   # Alters some chars in ASCII 0x23-0x7E range; see datasheet
   def setCharset(self, val=0):
      if val > 15: val = 15
      self.writeBytes(27, 82, val)

   CODEPAGE_CP437       =  0 # USA, Standard Europe
   CODEPAGE_KATAKANA    =  1
   CODEPAGE_CP850       =  2 # Multilingual
   CODEPAGE_CP860       =  3 # Portuguese
   CODEPAGE_CP863       =  4 # Canadian-French
   CODEPAGE_CP865       =  5 # Nordic
   CODEPAGE_WCP1251     =  6 # Cyrillic
   CODEPAGE_CP866       =  7 # Cyrillic #2
   CODEPAGE_MIK         =  8 # Cyrillic/Bulgarian
   CODEPAGE_CP755       =  9 # East Europe, Latvian 2
   CODEPAGE_IRAN        = 10
   CODEPAGE_CP862       = 15 # Hebrew
   CODEPAGE_WCP1252     = 16 # Latin 1
   CODEPAGE_WCP1253     = 17 # Greek
   CODEPAGE_CP852       = 18 # Latin 2
   CODEPAGE_CP858       = 19 # Multilingual Latin 1 + Euro
   CODEPAGE_IRAN2       = 20
   CODEPAGE_LATVIAN     = 21
   CODEPAGE_CP864       = 22 # Arabic
   CODEPAGE_ISO_8859_1  = 23 # West Europe
   CODEPAGE_CP737       = 24 # Greek
   CODEPAGE_WCP1257     = 25 # Baltic
   CODEPAGE_THAI        = 26
   CODEPAGE_CP720       = 27 # Arabic
   CODEPAGE_CP855       = 28
   CODEPAGE_CP857       = 29 # Turkish
   CODEPAGE_WCP1250     = 30 # Central Europe
   CODEPAGE_CP775       = 31
   CODEPAGE_WCP1254     = 32 # Turkish
   CODEPAGE_WCP1255     = 33 # Hebrew
   CODEPAGE_WCP1256     = 34 # Arabic
   CODEPAGE_WCP1258     = 35 # Vietnam
   CODEPAGE_ISO_8859_2  = 36 # Latin 2
   CODEPAGE_ISO_8859_3  = 37 # Latin 3
   CODEPAGE_ISO_8859_4  = 38 # Baltic
   CODEPAGE_ISO_8859_5  = 39 # Cyrillic
   CODEPAGE_ISO_8859_6  = 40 # Arabic
   CODEPAGE_ISO_8859_7  = 41 # Greek
   CODEPAGE_ISO_8859_8  = 42 # Hebrew
   CODEPAGE_ISO_8859_9  = 43 # Turkish
   CODEPAGE_ISO_8859_15 = 44 # Latin 3
   CODEPAGE_THAI2       = 45
   CODEPAGE_CP856       = 46
   CODEPAGE_CP874       = 47

   # Selects alt symbols for 'upper' ASCII values 0x80-0xFF
   def setCodePage(self, val=0):
      if val > 47: val = 47
      self.writeBytes(27, 116, val)

   # Copied from Arduino lib for parity; may not work on all printers
   def tab(self):
      self.writeBytes(9)
      self.column = (self.column + 4) & 0xFC

   # Copied from Arduino lib for parity; may not work on all printers
   def setCharSpacing(self, spacing):
      self.writeBytes(27, 32, spacing)

   # Overloading print() in Python pre-3.0 is dirty pool,
   # but these are here to provide more direct compatibility
   # with existing code written for the Arduino library.
   def print(self, *args, **kwargs):
      for arg in args:
         self.write(str(arg))

   # For Arduino code compatibility again
   def println(self, *args, **kwargs):
      for arg in args:
         self.write(str(arg))
      self.write('\n')


Va_Le
 
Posts: 3
Joined: Sat Aug 24, 2019 6:01 pm

Re: thermal printer feed does not work properly, neither bit

by adafruit2 on Mon Aug 26, 2019 3:32 pm

could be a flow control thing...but we dont have a solution :/

adafruit2
Site Admin
 
Posts: 19270
Joined: Fri Mar 11, 2005 7:36 pm

Re: thermal printer feed does not work properly, neither bit

by zooto68 on Mon Jan 13, 2020 6:11 pm

I fixed this by changing this line:

#define printBreakTime 8 // 500 uS

from 15 to 8

in the library .cpp file

zooto68
 
Posts: 15
Joined: Thu Feb 05, 2009 12:54 pm

Please be positive and constructive with your questions and comments.