60 lines
1.5 KiB
Python
60 lines
1.5 KiB
Python
"""
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UART based message handler for CircuitPython logging.
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Adafruit invests time and resources providing this open source code.
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Please support Adafruit and open source hardware by purchasing
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products from Adafruit!
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Written by Dave Astels for Adafruit Industries
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Copyright (c) 2018 Adafruit Industries
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Licensed under the MIT license.
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All text above must be included in any redistribution.
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"""
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#pylint:disable=missing-super-argument
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# Example:
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#
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# import board
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# import busio
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# from uart_handler import UartHandler
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# import adafruit_logging as logging
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#
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# uart = busio.UART(board.TX, board.RX, baudrate=115200)
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# logger = logging.getLogger()
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# logger.addHandler(UartHandler(uart))
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# logger.level = logging.INFO
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# logger.info('testing')
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from adafruit_logging import LoggingHandler
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class UartHandler(LoggingHandler):
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"""Send logging output to a serial port."""
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def __init__(self, uart):
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"""Create an instance.
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:param uart: the busio.UART instance to which to write messages
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"""
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self._uart = uart
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def format(self, level, msg):
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"""Generate a string to log.
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:param level: The level at which to log
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:param msg: The core message
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"""
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return super().format(level, msg) + '\r\n'
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def emit(self, level, msg):
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"""Generate the message and write it to the UART.
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:param level: The level at which to log
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:param msg: The core message
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"""
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self._uart.write(bytes(self.format(level, msg), 'utf-8'))
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