【Micropython】ESP8266驱动DS1307读写操作以及同步RTC

【Micropython】ESP8266驱动DS1307读写操作以及同步RTC

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• 相关篇《【Micropython】ESP8266通过NTP同步本地RTC时间》

DS1307读取和设置时间代码

• 注释部分内容为写入时间到DS1307中。

from machine import I2C, Pin
import time

led = Pin(2,Pin.OUT)	#板载led
# configure the I2C bus
i2c = I2C(scl=Pin(5), sda=Pin(4), freq=400000)
# 写入时间到DS1307当中启用
# seconds = ((10 // 10) << 4) + (10 % 10)
# minutes = ((30 // 10) << 4) + (30 % 10)
# hours = ((0 // 10) << 4) + (0 % 10)
# weekday = 2 % 7 + 1
# day = ((19 // 10) << 4) + (19 % 10)
# month = ((4 // 10) << 4) + (4 % 10)
# year = ((2023 - 2000) // 10 << 4) + (2023 - 2000) % 10
# 写入时间到DS1307当中
# i2c.writeto_mem(0x68, 0x00, bytes([seconds, minutes, hours, weekday, day, month, year]))
while True:
#    led.on()    
    # send command to read current time
    i2c.writeto(0x68, bytes([0x00]))

    # read current time from DS1307
    data = i2c.readfrom(0x68, 7)
    seconds = (data[0] & 0x0f) + ((data[0] & 0x70) >> 4) * 10
    minutes = (data[1] & 0x0f) + ((data[1] & 0x70) >> 4) * 10
    hours = (data[2] & 0x0f) + (((data[2] & 0x30) >> 4) % 2) * 10
    weekday = data[3]
    day = (data[4] & 0x0f) + ((data[4] & 0x30) >> 4) * 10
    month = (data[5] & 0x0f) + ((data[5] & 0x10) >> 4) * 10
    year = (data[6] & 0x0f) + ((data[6] & 0xf0) >> 4) * 10
    print('20{:02}/{:02}/{:02} {:02}:{:02}:{:02}'.format(year, month, day, hours, minutes, seconds))
    led.value(not led.value())        # 反转LED状态
    time.sleep(1)                     # 休眠1秒   

从网络获取时间设置到DS1307

import machine
import ntptime
import network
import utime
from machine import  Pin
led = Pin(2,Pin.OUT)	#板载led
rtc_addr = 0x68
rtc_data = bytearray(7)

# 启动 RTC
def start_rtc():
    i2c.writeto(rtc_addr, b'\x00')  # 发送“控制寄存器”地址指令
    rtc_data[0] = i2c.readfrom(rtc_addr, 1)[0]
    if rtc_data[0] & 0x80 == 0:
        rtc_data[0] |= 0x80  # 设置“控制寄存器”的停止位
        i2c.writeto(rtc_addr, b'\x00' + rtc_data)

# 停止 RTC
def stop_rtc():
    i2c.writeto(rtc_addr, b'\x00')  # 发送“控制寄存器”地址指令
    rtc_data[0] = i2c.readfrom(rtc_addr, 1)[0]
    if rtc_data[0] & 0x80 != 0:
        rtc_data[0] &= 0x7F  # 清除“控制寄存器”的停止位
        i2c.writeto(rtc_addr, b'\x00' + rtc_data)

# 获取 RTC 时钟
def get_rtc_datetime():
    i2c.writeto(rtc_addr, b'\x00')
    rtc_data = bytearray(i2c.readfrom(rtc_addr, 7))
    year = 2000 + int(rtc_data[6])
    month = int(rtc_data[5] & 0x1F)
    day = int(rtc_data[4] & 0x3F)
    weekday = int(rtc_data[3])
    hour = int(rtc_data[2] & 0x3F)
    minute = int(rtc_data[1] & 0x7F)
    second = int(rtc_data[0] & 0x7F)
    return (year, month, day, weekday, hour, minute, second)

# 初始化 I2C
i2c = machine.I2C(scl=machine.Pin(5), sda=machine.Pin(4))
i2c.scan()  # 检测设备是否在线

# 启动 RTC
start_rtc()
# 连接网络
sta_if = network.WLAN(network.STA_IF)
sta_if.active(True)
sta_if.connect('#######', '********')
while not sta_if.isconnected():
  pass
# 获取网络时间（UTC 时间）
ntptime.settime()

# 设置 RTC 时钟 将设备本地时间写入 DS1307 RTC
utc_time = utime.mktime(utime.localtime())
local_timezone = 28800  # 本地时区为 GMT+8

tm = utime.localtime(utc_time + local_timezone)
year = tm[0] - 2000
month = tm[1]
day = tm[2]
weekday = tm[6] + 1
hour = tm[3]
minute = tm[4]
second = tm[5]

#写入时间到DS1307当中
i2c.writeto_mem(0x68, 0x00, bytes([second, minute, hour, weekday, day, month, year]))

# 获取 RTC 时钟
print(get_rtc_datetime())

# 停止 RTC
stop_rtc()
while True:

    print(get_rtc_datetime())
    led.value(not led.value())        # 反转LED状态
    utime.sleep(1)