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103 lines
4.2 KiB
103 lines
4.2 KiB
# The MIT License (MIT)
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#
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# Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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# pylint: disable=too-few-public-methods
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"""
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`adafruit_register.i2c_bcd_datetime`
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====================================================
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Binary Coded Decimal date and time register
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* Author(s): Scott Shawcroft
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"""
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__version__ = "1.3.1"
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__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_Register.git"
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import time
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def _bcd2bin(value):
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"""Convert binary coded decimal to Binary
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:param value: the BCD value to convert to binary (required, no default)
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"""
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return value - 6 * (value >> 4)
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def _bin2bcd(value):
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"""Convert a binary value to binary coded decimal.
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:param value: the binary value to convert to BCD. (required, no default)
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"""
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return value + 6 * (value // 10)
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class BCDDateTimeRegister:
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"""
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Date and time register using binary coded decimal structure.
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The byte order of the register must* be: second, minute, hour, weekday, day (1-31), month, year
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(in years after 2000).
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* Setting weekday_first=False will flip the weekday/day order so that day comes first.
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Values are `time.struct_time`
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:param int register_address: The register address to start the read
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:param bool weekday_first: True if weekday is in a lower register than the day of the month
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(1-31)
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:param int weekday_start: 0 or 1 depending on the RTC's representation of the first day of the
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week
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"""
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def __init__(self, register_address, weekday_first=True, weekday_start=1):
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self.buffer = bytearray(8)
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self.buffer[0] = register_address
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if weekday_first:
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self.weekday_offset = 0
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else:
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self.weekday_offset = 1
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self.weekday_start = weekday_start
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def __get__(self, obj, objtype=None):
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# Read and return the date and time.
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with obj.i2c_device:
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obj.i2c_device.write(self.buffer, end=1, stop=False)
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obj.i2c_device.readinto(self.buffer, start=1)
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return time.struct_time((_bcd2bin(self.buffer[7]) + 2000,
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_bcd2bin(self.buffer[6]),
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_bcd2bin(self.buffer[5 - self.weekday_offset]),
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_bcd2bin(self.buffer[3]),
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_bcd2bin(self.buffer[2]),
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_bcd2bin(self.buffer[1] & 0x7F),
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_bcd2bin(self.buffer[4 + self.weekday_offset] -
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self.weekday_start),
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-1,
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-1))
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def __set__(self, obj, value):
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self.buffer[1] = _bin2bcd(value.tm_sec) & 0x7F # format conversions
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self.buffer[2] = _bin2bcd(value.tm_min)
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self.buffer[3] = _bin2bcd(value.tm_hour)
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self.buffer[4 + self.weekday_offset] = _bin2bcd(value.tm_wday + self.weekday_start)
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self.buffer[5 - self.weekday_offset] = _bin2bcd(value.tm_mday)
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self.buffer[6] = _bin2bcd(value.tm_mon)
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self.buffer[7] = _bin2bcd(value.tm_year - 2000)
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with obj.i2c_device:
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obj.i2c_device.write(self.buffer)
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