serial-port

问题 I am writing an application on Ubuntu Linux in C++ to read data from a serial port. It is working successfully by my code calling select() and then ioctl(fd,FIONREAD,&bytes_avail) to find out how many bytes are available before finally obtaining the data using read() . My question is this: Every time select returns with data, the number of bytes available is reported as 8. I am guessing that this is a buffer size set somewhere and that select returns notification to the user when this buffer

问题 Hi to all i am new here and i have heard a lot about this website that it really helps you out. Hope you will be able to help me out!. I have a very simple program which its only aim is to read from a serial port and prints it on the console window in C# for 2000 times. I am just turning a variable resistor on a micro-controller that's all Here below is the code using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO.Ports; namespace Testing

问题 Not a whole lot to say here other than this doesn't work, and I have no idea why. The serial output on the Arduino is nothing. The output on the C# code goes down to waiting for a response and then nothing. The Bluetooth card LED on the Arduino goes green when I start the C# program so there is a connection being made. Just nothing else. Arduino Code #include <SoftwareSerial.h> //Software Serial Port #define RxD 8 // This is the pin that the Bluetooth (BT_TX) will transmit to the Arduino (RxD

问题 I have a question regarding UART controller. Is UART controller a general name? i mean that if we use RS-232 protocol, we should name this UART controller, RS-232 controller and if we use RS-485 as protocol, we should call this UART controller, a RS-485 controller and so on? I've noticed that we generally say network controller (protocols:Ethernet, token ring,ATM,..) and if the protocol implemented is Ethernet for example, we say Ethernet controller. Is it a correct comparison between UART

问题 I have been working on an Arduino/Raspberry Pi project where I have found myself learning not just Python but Twisted Python as well; so I apologize in advance for my newbness. I am trying to keep it simple for now and just trying to send a char at any one time between the two devices. So far I am able to send from the Raspberry Pi to the Arduino and effectively turn its LED off/on just as expected. However I cannot seem to generate Twisted code which will detect anything coming from the

问题 So I'm working in Unity3D, programming in C#, and I heard that one can read data from a Bluetooth adaptor via SerialPort. I have several Bluetooth USB adaptors that I've tried to connect on my PC using this method. However, when I try to open the SerialPort, I get an error message that says port does not exist. I only included the code relevant to the question, but portI is a string ("COM11" or "COM12") and PortIn is of type SerialPort. void OnGUI() { GUI.Label(new Rect(btnX, btnY, btnW, btnH

问题 I'm trying to read Bluetooth Low Energy transmitted data programtically using Ruby. Bluetooth Low Energy technology provides no support for the Serial Port Profile (SPP) in the standard Specification v4.0. With older Bluetooth communication methods, one can just read the serial port for Bluetooth incoming data ( /dev/tty.Bluetooth-Incoming-Port ). Clearly, this won’t work for Bluetooth Low Energy, given it works almost completely differently. I came across a few tools like LightBlue and XCode

问题 I have an app where I read from the serialport, everything goes fine, until I close the app. When I click on the [X] the app simply hangs, the UI: unresponsive. I read from the port in the DataReceived event handler, and I close the port when FormClosed happens: private void MainForm_FormClosed(object sender, FormClosedEventArgs e) { mySerialPort.Close(); } 回答1: It's not a bug. The only reason it would hang when you close it is because in the event handler of your SerialPort object, you're

问题 I found several threads speacking about this subject, but after read them I don't have a clear idea about my problem. We have a external device (something like a tomtom device, I mean, not an accessory) and we want to connect this device to an android device. And we want to have serial communication between the external device and the android device using a USB connection. (At this time we have communication between the external device and other non android devices using RS232 interface, but

问题 I'm revisiting a communications protocol parser design for a stream of bytes (serial data, received 1 byte at a time). The packet structure (can't be changed) is: || Start Delimiter (1 byte) | Message ID (1 byte) | Length (1 byte) | Payload (n bytes) | Checksum (1 byte) || In the past I have implemented such systems in a procedural state-machine approach. As each byte of data arrives, the state machine is driven to see where/if the incoming data fits into a valid packet a byte at a time, and