感谢题主的邀请,我来说下我的看法:
您题目中所说的设备应该是USBCAN分析仪吧!如果是这类设备的话,那它一般都是不用特地去安装驱动的,所有的驱动程序都会在我们把设备连入电脑的几分钟之内自动安装上。因为USBCAN分析仪至少都拥有一个CAN总线通道,那我们在设备的驱动程序安装完毕之后,就可以前往设备管理器中寻找相应的CAN总线端口,USBCAN有几个CAN总线通道就有几个端口,现在你清楚了吗?如果您需要能够自动安装驱动程序的CAN总线控制卡设备的话,可以前往我们的网站进行具体的咨询,欢迎来访。
在CAN通信中,使用某个固定波特率的情况下,总线的通信流量就将是一个固定值,比如使用1Mbps的波特率,则该总线上100%负载率就是1秒的时间内可传输1Mbit的数据。当总线的平均利用率达到70%以上时,总线的通信将有可能出现拥堵的现象,极端情况下将有可能造成错误帧的出现,所以对于CAN通信需要严格控制好通信的负载率。
如下方图片若是就是我平时做程序开发时使用USBCAN-II这款CAN卡配合其专用的CANTEST软件做的一个测试截图,可以直接通过曲线的变化来实时监控我总线上的实际通信流量,以使我可以很方便的处理好程序中数据发送的时序问题。
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
}
}
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