nanoFramework.Iot.Device.Mcp7940xx 1.0.541

Mcp7940xx/MCP79400/MCP79401/MCP79402 - 具有SRAM的I²C实时时钟/日历

MCP7940M实时时钟/日历（RTCC）使用内部计数器跟踪小时、分钟、秒、日、月、年和星期几的时间。可以在所有计数器上配置闹钟，包括月份。

文档

数据表

原始代码是为ESP32编写的

用法

重要：在创建 I2cDevice 之前，请确保为 ESP32 正确设置了 I²C 引脚。为此，请确保安装了 nanoFramework.Hardware.Esp32 NuGet，并使用 Configuration 类配置这些引脚

//////////////////////////////////////////////////////////////////////
// when connecting to an ESP32 device, need to configure the I2C GPIOs used for the bus.
Configuration.SetPinFunction(Gpio.IO21, DeviceFunction.I2C1_DATA);
Configuration.SetPinFunction(Gpio.IO22, DeviceFunction.I2C1_CLOCK);

对于 STM32 等其他设备，请确保您正在使用想要的 I²C 总线的预设引脚。

以下示例演示了使用 Mcp7940xx 家族的时钟和闹钟功能。

using System;
using System.Device.I2c;
using System.Diagnostics;
using System.Threading;
using Iot.Device.Mcp7940xx;
using nanoFramework.Hardware.Esp32;

// Setup ESP32 I2C port.
Configuration.SetPinFunction(Gpio.IO21, DeviceFunction.I2C1_DATA);
Configuration.SetPinFunction(Gpio.IO22, DeviceFunction.I2C1_CLOCK);

// Setup Mcp7940m device. 
I2cConnectionSettings i2cSettings = new I2cConnectionSettings(1, Mcp7940m.DefaultI2cAddress);
I2cDevice i2cDevice = new I2cDevice(i2cSettings);

Mcp7940m clock = new Mcp7940m(i2cDevice, ClockSource.ExternalCrystal);
clock.SetTime(DateTime.UtcNow);
clock.StartClock(true);

// Set Alarm 1 to trigger on the 4th minute of every hour.
Mcp7940m.Alarm alarm1 = new Mcp7940m.Alarm(AlarmMatchMode.Minute, minute: 4);
clock.SetAlarm1(alarm1);
clock.EnableAlarm1();
Debug.WriteLine($"Alarm 1 : {clock.GetAlarm1()}");

// Set Alarm 2 to trigger every Wednesday.
Mcp7940m.Alarm alarm2 = new Mcp7940m.Alarm(AlarmMatchMode.DayOfWeek, dayOfWeek: DayOfWeek.Wednesday);
clock.SetAlarm2(alarm2);
clock.EnableAlarm2();
Debug.WriteLine($"Alarm 2 : {clock.GetAlarm2()}");

while (true)
{
    // Get current time.
    DateTime currentTime = clock.GetTime();
    Debug.WriteLine($"Time: {currentTime.ToString("yyyy/MM/dd HH:mm:ss")}");

    // Check if alarm 1 has triggered.
    if (clock.IsTriggeredAlarm1)
    {
        Debug.WriteLine("[ALARM 1]");

        // Clear alarm 1 flag.
        clock.ResetAlarm1();
    }

    // Check if alarm 2 has triggered.
    if (clock.IsTriggeredAlarm2)
    {
        Debug.WriteLine("[ALARM 2]");

        // Clear alarm 2 flag.
        clock.ResetAlarm2();

        // Turn off alarm 2.
        clock.DisableAlarm2();
    }

    // Wait for one second.
    Thread.Sleep(1000);
}

以下示例演示了访问 Mcp79401 的受保护 EEPROM 和 EUI。

using System;
using System.Device.I2c;
using System.Diagnostics;
using System.Threading;
using Iot.Device.Mcp7940xx;
using nanoFramework.Hardware.Esp32;

// Setup ESP32 I2C port.
Configuration.SetPinFunction(Gpio.IO21, DeviceFunction.I2C1_DATA);
Configuration.SetPinFunction(Gpio.IO22, DeviceFunction.I2C1_CLOCK);

// Setup Mcp79401 eeprom device. 
I2cConnectionSettings i2cSettings = new I2cConnectionSettings(1, Mcp79401.Eeprom.DefaultI2cAddress);
I2cDevice i2cDevice = new I2cDevice(i2cSettings);

Mcp79401.Eeprom eeprom = new Mcp79401.Eeprom(i2cDevice);

// Read and write to EEPROM.
byte byteAddress = 0;
eeprom.WriteByte(byteAddress, 0xA6);
byte value = eeprom.ReadByte(byteAddress);

// Read EUI from EEPROM.
byte[] eui = eeprom.ReadEui();