nanoFramework.Iot.Device.Nrf24l01 1.2.570

nRF24L01 - 单片 2.4 GHz 收发器

nRF24L01 是一个用于全球 2.4 - 2.5 GHz ISM 波段的单片无线电收发器。

文档

• 绑定数据表可在此处找到 这里

电路板

注意：以下图表使用 Raspberry Pi。这可以用任何具有 2 个可用 SPI 的 MCU 实现。

用法

硬件要求

• nRF24L01 × 2
• 公/母跳线

nRF1 连接

• VCC - 3.3V (最佳)
• GND - GND
• MOSI - SPI0 MOSI (GPIO 10)
• MISO - SPI0 MISO (GPIO 9)
• SCK - SPI0 SCLK (GPIO 11)
• CSN - SPI0 CS0 (GPIO 8)
• CE - GPIO 23
• IRQ - GPIO 24

nRF2 连接

• VCC - 3.3V (最佳)
• GND - GND
• MOSI - SPI1 MOSI (GPIO 20)
• MISO - SPI1 MISO (GPIO 19)
• SCK - SPI1 SCLK (GPIO 21)
• CSN - SPI1 CS0 (GPIO 16)
• CE - GPIO 5
• IRQ - GPIO 6

代码

重要：在创建 SpiDevice 之前，务必正确设置 SPI 引脚，特别是针对 ESP32 的 SPI 引脚，确保已安装 nanoFramework.Hardware.ESP32 nuget

//////////////////////////////////////////////////////////////////////
// when connecting to an ESP32 device, need to configure the SPI GPIOs
// used for the bus
Configuration.SetPinFunction(21, DeviceFunction.SPI1_MOSI);
Configuration.SetPinFunction(22, DeviceFunction.SPI1_MISO);
Configuration.SetPinFunction(23, DeviceFunction.SPI1_CLOCK);
// Make sure as well you are using the right chip select

对于其他设备，如 STM32，请确保您使用的是您想使用的 SPI 通道的预置引脚。片选也可以预先设置。

SpiConnectionSettings senderSettings = new SpiConnectionSettings(1, 42)
{
    ClockFrequency = Nrf24l01.SpiClockFrequency,
    Mode = Nrf24l01.SpiMode
};

SpiConnectionSettings receiverSettings = new SpiConnectionSettings(2, 44)
{
    ClockFrequency = Nrf24l01.SpiClockFrequency,
    Mode = Nrf24l01.SpiMode
};
var senderDevice = SpiDevice.Create(senderSettings);
var receiverDevice = SpiDevice.Create(receiverSettings);

// SPI Device, CE Pin, IRQ Pin, Receive Packet Size
using (Nrf24l01 sender = new Nrf24l01(senderDevice, 23, 24, 20))
{
    using (Nrf24l01 receiver = new Nrf24l01(receiverDevice, 5, 6, 20))
    {
        // Set sender send address, receiver pipe0 address (Optional)
        byte[] receiverAddress = Encoding.UTF8.GetBytes("NRF24");
        sender.Address = receiverAddress;
        receiver.Pipe0.Address = receiverAddress;

        // Binding DataReceived event
        receiver.DataReceived += Receiver_ReceivedData;

        // Loop
        while (true)
        {
            sender.Send(Encoding.UTF8.GetBytes("Hello! .NET Core IoT"));

            Thread.Sleep(2000);
        }
    }
}

private static void Receiver_ReceivedData(object sender, DataReceivedEventArgs e)
{
    var raw = e.Data;
    var msg = Encoding.UTF8.GetString(raw);

    Debug.Write("Received Raw Data: ");
    foreach (var item in raw)
    {
        Debug.Write($"{item} ");
    }
    Debug.WriteLine();

    Debug.WriteLine($"Message: {msg}");
    Debug.WriteLine();
}

结果