Windows 物联网 Raspberry Pi 3 C# RTC DS3231

Question

这个 post 可能看起来与 Windows 物联网和 DS3231 RTC 时钟重复但它似乎对我不起作用。我没有在这种环境中使用 i2c 的经验。

我的预期功能是，

在启动时检查是否有任何网络连接来更新系统时钟
如果离线，系统将从 DS3231 读取 datetime 并更新系统 datetime
datetime 与 datepicker 的任何变化或 timepicker 它将更新 DS3231

我的问题是

如何检查网络可用性以更新系统时钟。

阅读 DS3231 使用 i1cdevice.writeread 需要分别 write read address 吗？ i2c 是否会自动读取所有数据，直到收到 stop 位，或者我必须设置一个计数器？

private const byte DS3231_I2C_WADDR = 0xD0;
private const byte DS3231_I2C_RADDR = 0xD1;
private I2cDevice DS3231_RTC; 

byte[] i2CWriteBuffer;
byte[] i2CReadBuffer;

private async void Read_DS3231_RTC()
{
    var settings = new I2cConnectionSettings(DS3231_I2C_RADDR);
    settings.BusSpeed = I2cBusSpeed.StandardMode;
    var controller = await I2cController.GetDefaultAsync();
    DS3231_RTC = controller.GetDevice(settings);

    try
    {
        DS3231_RTC.WriteRead(new byte[] { DS3231_I2C_RADDR }, i2CReadBuffer);
        }
    catch (Exception e)
    {
        StatusMessage.Text = "Fail to Init I2C:" + e.Message;
        return;
    }
}

写入DS3231 时间设置有dateicker & timepicker 设置 datetime 后，我如何更新为 DS3231

private void DatePicker_DateChanged(object sender, DatePickerValueChangedEventArgs e)
{
    DateTimeSettings.SetSystemDateTime(e.NewDate.UtcDateTime);
    SetTime_DS3231();
}

private void TimePicker_TimeChanged(object sender, TimePickerValueChangedEventArgs e)
{
    var currentDate = DateTime.Now.ToUniversalTime();

    var newDateTime = new DateTime(currentDate.Year,
                                   currentDate.Month,
                                   currentDate.Day,
                                   e.NewTime.Hours,
                                   e.NewTime.Minutes,
                                   e.NewTime.Seconds);

    DateTimeSettings.SetSystemDateTime(newDateTime);
}

谢谢。

Answer 1

1.How to check for network availibility to update system clock.

您可以使用 NetworkInterface class 的 GetIsNetworkAvailable 方法来检查是否已连接互联网。您可以从此主题中获得有关如何在通用 Windows 平台中检查互联网连接类型的更多知识 .

bool isInternetConnected = NetworkInterface.GetIsNetworkAvailable();

2.to read from DS3231 using i1cdevice.writeread requires to write read address separately? does the i2c automatically reads all the data until stop bit is received or i have to setup a counter ?

没必要分开写读。 WriteRead 方法执行原子操作，将数据写入设备所连接的 inter-integrated 电路 (I2 C) 总线，然后从中读取数据，并在写入和读取操作之间发送重启条件。第二个参数是要从 I2 C 总线读取数据的缓冲区。缓冲区的长度决定了从 device.It 请求多少数据不会自动停止，直到停止位为 received.If I2 C 设备在整个缓冲区被读取之前否定确认数据传输，将会有错误（错误代码 0x8007045D）。

3.to write to DS3231 there are dateicker & timepicker for time setting upon setting the datetime how could I update to DS3231

如TRS在话题Windows中回复的物联网和DS3231 RTC时钟 ,he/she提供设置时钟的方法

新更新：

    private async void SetTime_DS3231(DateTime dt)
    {
        int SlaveAddress = 0x68;

        try
        {
            // Initialize I2C
            var Settings = new I2cConnectionSettings(SlaveAddress);
            Settings.BusSpeed = I2cBusSpeed.StandardMode;

            if (AQS == null || DIS == null)
            {
                AQS = I2cDevice.GetDeviceSelector("I2C1");
                DIS = await Windows.Devices.Enumeration.DeviceInformation.FindAllAsync(AQS);
            }

            using (I2cDevice Device = await I2cDevice.FromIdAsync(DIS[0].Id, Settings))
            {
                byte write_seconds = decToBcd((byte)dt.Second);
                byte write_minutes = decToBcd((byte)dt.Minute);
                byte write_hours = decToBcd((byte)dt.Hour);
                byte write_dayofweek = decToBcd((byte)dt.DayOfWeek);
                byte write_day = decToBcd((byte)dt.Day);
                byte write_month = decToBcd((byte)dt.Month);
                byte write_year = decToBcd((byte)(dt.Year%100));

                byte[] write_time = { 0x00, write_seconds, write_minutes, write_hours, write_dayofweek, write_day, write_month, write_year };

                Device.Write(write_time);

            }
        }
        catch (Exception ex)
        {
            System.Diagnostics.Debug.Write(ex.Message);
        }
    }

    private static byte decToBcd(byte val)
    {
        return (byte)(((int)val / 10 * 16) + ((int)val % 10));
    }

Windows 物联网 Raspberry Pi 3 C# RTC DS3231

Windows IoT Raspberry Pi 3 C# RTC DS3231

c#

uwp

raspberry-pi3

windows-iot-core-10

real-time-clock