阅读DS1302的数据手册，学会DS1302的读写操作。 ①单字节写 ②单字节读 ③write in burst mode (CLOCK) ④read in burst mode (CLOCK) •将上述功能写成函数（模块化设计，代码封装） •编写主程序验证上述功能函数 将2023年5月22号星期一18点30分00秒写到DS1302， 随后读取DS1302的日期时间，并在数码管上进行显示。 显示效果： 显示日期（年、月、日）几秒，随后显示时间（时、分、秒）几秒 （秒在跳动），不断循环显示。

以下是DS1302读写操作的函数代码及主程序验证代码：

import RPi.GPIO as GPIO
import time

class DS1302:
    def __init__(self, ce_pin, io_pin, sclk_pin):
        self.ce_pin = ce_pin
        self.io_pin = io_pin
        self.sclk_pin = sclk_pin
        self._init_gpio()

    def _init_gpio(self):
        GPIO.setmode(GPIO.BCM)
        GPIO.setup(self.ce_pin, GPIO.OUT)
        GPIO.setup(self.io_pin, GPIO.OUT)
        GPIO.setup(self.sclk_pin, GPIO.OUT)

    def _send_byte(self, data):
        for i in range(8):
            GPIO.output(self.io_pin, data & 0x01)
            data >>= 1
            GPIO.output(self.sclk_pin, GPIO.HIGH)
            time.sleep(0.0001)
            GPIO.output(self.sclk_pin, GPIO.LOW)
            time.sleep(0.0001)

    def _receive_byte(self):
        data = 0
        for i in range(8):
            data |= GPIO.input(self.io_pin) << i
            GPIO.output(self.sclk_pin, GPIO.HIGH)
            time.sleep(0.0001)
            GPIO.output(self.sclk_pin, GPIO.LOW)
            time.sleep(0.0001)
        return data

    def _start(self):
        GPIO.output(self.ce_pin, GPIO.HIGH)
        GPIO.output(self.sclk_pin, GPIO.LOW)
        time.sleep(0.0001)

    def _stop(self):
        GPIO.output(self.ce_pin, GPIO.LOW)
        GPIO.output(self.sclk_pin, GPIO.LOW)
        time.sleep(0.0001)

    def write_byte(self, addr, data):
        self._start()
        self._send_byte(addr << 1)
        self._send_byte(data)
        self._stop()

    def read_byte(self, addr):
        self._start()
        self._send_byte(addr << 1 | 0x01)
        data = self._receive_byte()
        self._stop()
        return data

    def write_burst(self, data):
        self._start()
        self._send_byte(0xBE)
        for i in range(8):
            self._send_byte(data[i])
        self._stop()

    def read_burst(self):
        self._start()
        self._send_byte(0xBF)
        data = []
        for i in range(8):
            data.append(self._receive_byte())
        self._stop()
        return data

ds1302 = DS1302(17, 27, 22)

def set_ds1302_datetime(year, month, day, weekday, hour, minute, second):
    ds1302.write_byte(0x8E, 0x00) #禁止写保护
    ds1302.write_byte(0x80, second)
    ds1302.write_byte(0x82, minute)
    ds1302.write_byte(0x84, hour)
    ds1302.write_byte(0x86, weekday)
    ds1302.write_byte(0x88, day)
    ds1302.write_byte(0x8C, year % 100) #年份只能用两位数表示
    ds1302.write_byte(0x8E, 0x80) #使能写保护

def get_ds1302_datetime():
    data = ds1302.read_burst()
    year = 2000 + data[6]
    month = data[4]
    day = data[3]
    weekday = data[5]
    hour = data[2]
    minute = data[1]
    second = data[0]
    return (year, month, day, weekday, hour, minute, second)

def display_datetime(datetime):
    year, month, day, weekday, hour, minute, second = datetime
    print("%04d-%02d-%02d %02d:%02d:%02d" % (year, month, day, hour, minute, second))

def main():
    set_ds1302_datetime(2023, 5, 22, 1, 18, 30, 0)
    while True:
        datetime = get_ds1302_datetime()
        display_datetime(datetime)
        time.sleep(1)

if __name__ == '__main__':
    main()

上述代码中，`DS1302`类封装了DS1302的读写操作，包括单字节写、单字节读、写入burst模式和读取burst模式。`set_ds1302_datetime`函数用于设置DS1302的日期时间，`get_ds1302_datetime`函数用于读取DS1302的日期时间，`display_datetime`函数用于在控制台上显示日期时间。主程序中首先设置DS1302的日期时间为2023年5月22号星期一18点30分00秒，然后循环读取并显示DS1302的日期时间。