thermal printer feed does not work properly, neither bitmap

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

thermal printer feed does not work properly, neither bitmap

Post by einlagerfeuer »

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!
result of A_printertest
result of A_printertest
IMG_3998.JPG (84.35 KiB) Viewed 3741 times
feed
feed
IMG_3999.JPG (57.65 KiB) Viewed 3741 times

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

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

Post by inonoob »

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

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

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

Post by PixelDemon »

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!

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

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

Post by Ramondes »

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

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

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

Post by costelano »

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

void Adafruit_Thermal::begin

and before closing bracket "}" insert the reset command again:

Code: Select all

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.

User avatar
adafruit2
 
Posts: 22149
Joined: Fri Mar 11, 2005 7:36 pm

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

Post by adafruit2 »

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

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

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

Post by lcorrea »

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.

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

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

Post by Va_Le »

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:
Modified &quot;printertest.py&quot; from the Tutorials original printertest
Modified "printertest.py" from the Tutorials original printertest
1.jpg (525.46 KiB) Viewed 2355 times
Printer-Selftest. Printed at holding the feed-button at the same time turning on the power.
Printer-Selftest. Printed at holding the feed-button at the same time turning on the power.
2.jpg (733.07 KiB) Viewed 2355 times

Any ideas / help?

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

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

Post by Va_Le »

I think my problem is anywhere inside the Adafruit_Thermal.py

here it is:

Code: Select all

#*************************************************************************
# 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')


User avatar
adafruit2
 
Posts: 22149
Joined: Fri Mar 11, 2005 7:36 pm

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

Post by adafruit2 »

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

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

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

Post by zooto68 »

I fixed this by changing this line:

#define printBreakTime 8 // 500 uS

from 15 to 8

in the library .cpp file

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