48 lines
1.2 KiB
Python
48 lines
1.2 KiB
Python
"""
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Script to set the RTC using the browser time.
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/usr/bin/python3 /var/www/nebuleair_pro_4g/RTC/set_with_browserTime.py '$rtc_time'
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"""
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import sys
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from datetime import datetime
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import smbus2
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# DS3231 I2C address
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DS3231_ADDR = 0x68
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REG_TIME = 0x00
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def dec_to_bcd(dec):
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"""Convert decimal to BCD."""
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return (dec // 10 * 16) + (dec % 10)
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def set_rtc(bus, year, month, day, hour, minute, second):
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"""Set the RTC time."""
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second_bcd = dec_to_bcd(second)
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minute_bcd = dec_to_bcd(minute)
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hour_bcd = dec_to_bcd(hour)
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day_bcd = dec_to_bcd(day)
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month_bcd = dec_to_bcd(month)
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year_bcd = dec_to_bcd(year - 2000) # RTC stores years since 2000
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bus.write_i2c_block_data(DS3231_ADDR, REG_TIME, [
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second_bcd, minute_bcd, hour_bcd, 0x01, day_bcd, month_bcd, year_bcd
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])
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def main():
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if len(sys.argv) != 2:
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print("Usage: python3 set_rtc.py 'YYYY-MM-DD HH:MM:SS'")
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sys.exit(1)
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rtc_time_str = sys.argv[1]
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rtc_time = datetime.strptime(rtc_time_str, '%Y-%m-%d %H:%M:%S')
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bus = smbus2.SMBus(1)
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set_rtc(bus, rtc_time.year, rtc_time.month, rtc_time.day,
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rtc_time.hour, rtc_time.minute, rtc_time.second)
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print(f"RTC updated to: {rtc_time}")
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if __name__ == "__main__":
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main()
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