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185 lines
7.1 KiB
185 lines
7.1 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_alarm`
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====================================================
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Binary Coded Decimal alarm 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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ALARM_COMPONENT_DISABLED = 0x80
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FREQUENCY = ["secondly", "minutely", "hourly", "daily", "weekly", "monthly"]
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class BCDAlarmTimeRegister:
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"""
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Alarm date and time register using binary coded decimal structure.
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The byte order of the registers must* be: [second], minute, hour, day,
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weekday. Each byte must also have a high enable bit where 1 is disabled and
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0 is enabled.
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* If weekday_shared is True, then weekday and day share a register.
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* If has_seconds is True, then there is a seconds register.
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Values are a tuple of (`time.struct_time`, `str`) where the struct represents
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a date and time that would alarm. The string is the frequency:
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* "secondly", once a second (only if alarm has_seconds)
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* "minutely", once a minute when seconds match (if alarm doesn't seconds then when seconds = 0)
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* "hourly", once an hour when ``tm_min`` and ``tm_sec`` match
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* "daily", once a day when ``tm_hour``, ``tm_min`` and ``tm_sec`` match
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* "weekly", once a week when ``tm_wday``, ``tm_hour``, ``tm_min``, ``tm_sec`` match
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* "monthly", once a month when ``tm_mday``, ``tm_hour``, ``tm_min``, ``tm_sec`` match
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:param int register_address: The register address to start the read
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:param bool has_seconds: True if the alarm can happen minutely.
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:param bool weekday_shared: True if weekday and day share the same register
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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 (Monday)
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"""
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# Defaults are based on alarm1 of the DS3231.
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def __init__(self, register_address, has_seconds=True, weekday_shared=True, weekday_start=1):
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buffer_size = 5
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if weekday_shared:
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buffer_size -= 1
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if has_seconds:
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buffer_size += 1
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self.has_seconds = has_seconds
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self.buffer = bytearray(buffer_size)
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self.buffer[0] = register_address
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self.weekday_shared = weekday_shared
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self.weekday_start = weekday_start
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def __get__(self, obj, objtype=None):
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# Read the alarm register.
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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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frequency = None
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i = 1
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seconds = 0
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if self.has_seconds:
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if (self.buffer[1] & 0x80) != 0:
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frequency = "secondly"
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else:
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frequency = "minutely"
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seconds = _bcd2bin(self.buffer[1] & 0x7f)
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i = 2
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minute = 0
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if (self.buffer[i] & 0x80) == 0:
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frequency = "hourly"
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minute = _bcd2bin(self.buffer[i] & 0x7f)
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hour = 0
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if (self.buffer[i + 1] & 0x80) == 0:
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frequency = "daily"
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hour = _bcd2bin(self.buffer[i + 1] & 0x7f)
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mday = None
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wday = None
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if (self.buffer[i + 2] & 0x80) == 0:
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# day of the month
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if not self.weekday_shared or (self.buffer[i + 2] & 0x40) == 0:
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frequency = "monthly"
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mday = _bcd2bin(self.buffer[i + 2] & 0x3f)
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else: # weekday
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frequency = "weekly"
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wday = _bcd2bin(self.buffer[i + 2] & 0x3f) - self.weekday_start
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# weekday
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if not self.weekday_shared and (self.buffer[i + 3] & 0x80) == 0:
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frequency = "monthly"
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mday = _bcd2bin(self.buffer[i + 3] & 0x7f)
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if mday is not None:
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wday = (mday - 2) % 7
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elif wday is not None:
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mday = wday + 2
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else:
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# Jan 1, 2017 was a Sunday (6)
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wday = 6
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mday = 1
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return (time.struct_time((2017, 1, mday, hour, minute, seconds, wday, mday, -1)), frequency)
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def __set__(self, obj, value):
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if len(value) != 2:
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raise ValueError("Value must be sequence of length two")
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# Turn all components off by default.
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for i in range(len(self.buffer) - 1):
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self.buffer[i + 1] = ALARM_COMPONENT_DISABLED
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frequency_name = value[1]
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error_message = "%s is not a supported frequency" % frequency_name
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if frequency_name not in FREQUENCY:
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raise ValueError(error_message)
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frequency = FREQUENCY.index(frequency_name)
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if frequency <= 1 and not self.has_seconds:
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raise ValueError(error_message)
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# i is the index of the minute byte
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i = 2 if self.has_seconds else 1
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if frequency > 0 and self.has_seconds: # minutely at least
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self.buffer[1] = _bin2bcd(value[0].tm_sec)
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if frequency > 1: # hourly at least
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self.buffer[i] = _bin2bcd(value[0].tm_min)
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if frequency > 2: # daily at least
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self.buffer[i + 1] = _bin2bcd(value[0].tm_hour)
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if value[1] == "weekly":
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if self.weekday_shared:
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self.buffer[i + 2] = _bin2bcd(value[0].tm_wday + self.weekday_start) | 0x40
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else:
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self.buffer[i + 3] = _bin2bcd(value[0].tm_wday + self.weekday_start)
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elif value[1] == "monthly":
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self.buffer[i + 2] = _bin2bcd(value[0].tm_mday)
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with obj.i2c_device:
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obj.i2c_device.write(self.buffer)
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