Source code for adafruit_thermal_printer.thermal_printer_264

# SPDX-FileCopyrightText: 2017 Tony DiCola for Adafruit Industries
# SPDX-License-Identifier: MIT


Thermal printer control module built to work with small serial thermal
receipt printers.  Note that these printers have many different firmware
versions and care must be taken to select the appropriate module inside this
package for your firmware printer:

* thermal_printer_2168 = Printers with firmware version 2.168+.
* thermal_printer = The latest printers with firmware version 2.68 up to 2.168
* thermal_printer_264 = Printers with firmware version 2.64 up to 2.68.
* thermal_printer_legacy = Printers with firmware version before 2.64.

* Author(s): Tony DiCola
from micropython import const

import adafruit_thermal_printer.thermal_printer as thermal_printer

__version__ = "0.0.0-auto.0"
__repo__ = ""

# Internally used constants.
_INVERSE_MASK = const(1 << 1)  # Not in 2.6.8 firmware

# Legacy behavior class for printers with firmware 2.64 up to 2.68.
# See the comments in to understand how this class overrides
# methods which change for older firmware printers!
[docs]class ThermalPrinter(thermal_printer.ThermalPrinter): """Thermal printer for printers with firmware version 2.64 up to (but NOT including) 2.68. """ # Barcode types. These vary based on the firmware version so are made # as class-level variables that users can reference (i.e. # ThermalPrinter.UPC_A, etc) and write code that is independent of the # printer firmware version. UPC_A = 65 UPC_E = 66 EAN13 = 67 EAN8 = 68 CODE39 = 69 ITF = 70 CODABAR = 71 CODE93 = 72 CODE128 = 73 def __init__( self, uart, byte_delay_s=0.00057346, dot_feed_s=0.0021, dot_print_s=0.03 ): """Thermal printer class. Requires a serial UART connection with at least the TX pin connected. Take care connecting RX as the printer will output a 5V signal which can damage boards! If RX is unconnected the only loss in functionality is the has_paper function, all other printer functions will continue to work. The byte_delay_s, dot_feed_s, and dot_print_s values are delays which are used to prevent overloading the printer with data. Use the default delays unless you fully understand the workings of the printer and how delays, baud rate, number of dots, heat time, etc. relate to each other. """ super().__init__( uart, byte_delay_s=byte_delay_s, dot_feed_s=dot_feed_s, dot_print_s=dot_print_s, ) # Inverse on older printers (pre 2.68) uses a print mode bit instead of # specific commands. inverse = thermal_printer.ThermalPrinter._PrintModeBit(_INVERSE_MASK)