用C#怎么写UART、SPI、I2C、CAN总线上测试时的数据程序？

针对 树莓派 封装的 UWP应用 类，以下代码未经测试，聊以抛砖引玉：

using System

using System.Collections.Generic

using System.Linq

using System.Text

using System.Threading.Tasks

using Windows.Devices.Gpio

using Windows.Storage.Streams

using Windows.Devices.Enumeration

using Windows.Devices.SerialCommunication

using Windows.Devices.I2c

using Windows.Devices.Spi

namespace SlotAgentApp.Services

{

public class DevicesHelper

{

public static void GPIO(int eLevel=0, int ioPortNumber = 5)

{

// 获得系统板载缺省GPIO controller

GpioController gpio = GpioController.GetDefault()

if (gpio == null)

return// 如果系统板载无可用GPIO，则返回

// 打开指定的GPIO

using (GpioPin pin = gpio.OpenPin(ioPortNumber))

{

// Latch HIGH value first. This ensures a default value when the pin is set as output

pin.Write(eLevel==0? GpioPinValue.Low: GpioPinValue.High)

// 设置IO为输出方向

pin.SetDriveMode(GpioPinDriveMode.Output)

} //关闭 pin - will revert to its power-on state

}

#region 示例代码

/*

（一）GPIO接口使用

*/

public void GPIO()

{

// Get the default GPIO controller on the system

GpioController gpio = GpioController.GetDefault()

if (gpio == null)

return// GPIO not available on this system

// Open GPIO 5

using (GpioPin pin = gpio.OpenPin(5))

{

// Latch HIGH value first. This ensures a default value when the pin is set as output

pin.Write(GpioPinValue.High)

// Set the IO direction as output

pin.SetDriveMode(GpioPinDriveMode.Output)

} // Close pin - will revert to its power-on state

}

/*

（二） UART接口

Pin 8 - UART0 TX

Pin 10- UART0 RX

下面的例子先是初始化UART0，然后做了一次读 *** 作和一次写 *** 作

*/

public async void Serial()

{

string aqs = SerialDevice.GetDeviceSelector("UART0") /* Find the selector string for the serial device */

var dis = await DeviceInformation.FindAllAsync(aqs) /* Find the serial device with our selector string */

SerialDevice SerialPort = await SerialDevice.FromIdAsync(dis[0].Id) /* Create an serial device with our selected device */

/* Configure serial settings */

SerialPort.WriteTimeout = TimeSpan.FromMilliseconds(1000)

SerialPort.ReadTimeout = TimeSpan.FromMilliseconds(1000)

SerialPort.BaudRate = 9600

SerialPort.Parity = SerialParity.None

SerialPort.StopBits = SerialStopBitCount.One

SerialPort.DataBits = 8

/* Write a string out over serial */

string txBuffer = "Hello Serial"

DataWriter dataWriter = new DataWriter()

dataWriter.WriteString(txBuffer)

uint bytesWritten = await SerialPort.OutputStream.WriteAsync(dataWriter.DetachBuffer())

/* Read data in from the serial port */

const uint maxReadLength = 1024

DataReader dataReader = new DataReader(SerialPort.InputStream)

uint bytesToRead = await dataReader.LoadAsync(maxReadLength)

string rxBuffer = dataReader.ReadString(bytesToRead)

}

/*

使用上面的例子时，需要在Package.appxmanifest 中修改下权限修改如下

<Capabilities>

<DeviceCapability Name="serialcommunication">

<Device Id="any">

<Function Type="name:serialPort" />

</Device>

</DeviceCapability>

</Capabilities>

*/

/*

（三）I2C 总线

Pin 3 - I2C1 SDA

Pin 5 - I2C1 SCL

下面的例子首先初始化I2C1 然后向地址为0x40的I2C设备写数据

*/

public async void I2C()

{

// Get a selector string for bus "I2C1"

string aqs = I2cDevice.GetDeviceSelector("I2C1")

// Find the I2C bus controller with our selector string

var dis = await DeviceInformation.FindAllAsync(aqs)

if (dis.Count == 0)

return// bus not found

// 0x40 is the I2C device address

var settings = new I2cConnectionSettings(0x40)

// Create an I2cDevice with our selected bus controller and I2C settings

using (I2cDevice device = await I2cDevice.FromIdAsync(dis[0].Id, settings))

{

byte[] writeBuf = { 0x01, 0x02, 0x03, 0x04 }

device.Write(writeBuf)

}

}

/*

（四） SPI 总线

Pin 19 - SPI0 MOSI

Pin 21 - SPI0 MISO

Pin 23 - SPI0 SCLK

Pin 24 - SPI0 CS0

Pin 26 - SPI0 CS1

下面的例子向SPI0 做了一次写 *** 作

*/

public async void SPI()

{

// Get a selector string for bus "SPI0"

string aqs = SpiDevice.GetDeviceSelector("SPI0")

// Find the SPI bus controller device with our selector string

var dis = await DeviceInformation.FindAllAsync(aqs)

if (dis.Count == 0)

return// "SPI0" not found on this system

// Use chip select line CS0

var settings = new SpiConnectionSettings(0)

// Create an SpiDevice with our bus controller and SPI settings

using (SpiDevice device = await SpiDevice.FromIdAsync(dis[0].Id, settings))

{

byte[] writeBuf = { 0x01, 0x02, 0x03, 0x04 }

device.Write(writeBuf)

}

}

#endregion

}

}

方法如下：

1、先到淘宝或者电脑商城找一个USB转rs232的转换器，最好是光电隔离的那种。

2、然后打开电脑，先把转化器的光盘放到电脑光驱里面，然后把USB转RS232电缆连接到电脑的USB接口，电脑会自动查找并且安装。

3、安装完成以后，打开电脑-属性-设备管理器会看见多了一个端口com#，#是端口号。

4、把三菱的编程线连接到USB转RS232的9针插头上，读取plc，在传输设置中双击“串行”图标，选择com#就可以了。

5、编程软件的com口和电脑的com一致。

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