hterm | Browser terminal server using Google/Chrome 's hterm emulator | Emulator library
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kandi X-RAY | hterm Summary
hterm: Browser terminal server using Google/Chrome's hterm emulator
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QUESTION
Im trying to read a protocol through the USB/Serial port[ttyACM*/COM*]. I was supposed to receive a frame with the following pattern when the device returns the response:
| FF | 15 | 44 | 7D | 00 | 88 | 00 | 0D | 00 | 00 | 86 | 00 | 76 | 00 | 00 | 00 | 00 | 40 | 00 | A7 | FE | (21 hexbytes)
The configuration which i must use is the following:
- Baudrate: 2400
- Data bits: 8
- Parity: None
- Stop bits: 1
- Handshaking: None
Now when i try to read this using CuteCom on Linux or HTerm on Windows everything works fine and i get the frame exactly how i need it when i show it as hex.
HTerm:
Frame Response: FF 15 44 7C 00 88 00 00 7B 00 7C 00 73 00 1F 00 00 40 00 26 FE (21 hexbytes)
CuteCom:
Frame Response: ff 15 44 00 00 78 00 00 00 00 01 00 79 00 18 00 00 8d 00 f0 fe (21 hexbytes)
Now why is it that when i try to read the serial using picocom, i can't get the data that i need?
Picocom: picocom -b 2400 -r -l --omap crcrlf --imap 8bithex -f n /dev/ttyACM0
Frame Response: ff D 82 88 81 82 y@> fe (6 hexbytes?)
And what's up with the weird characters in the middle of the frame?
But more importantly when trying to receive the frame in python, which i'll be using to parse the package i also can't get the frame on the same format as cutecom/hterm:
Python [Code]:
...ANSWER
Answered 2020-Sep-03 at 19:16Turns out python is just conveniently changing the hex characters to ASCII. But the value stays the same so the frame can be used normally. While picocom is ignoring the null characters.
QUESTION
I have a Python script to communicate with a measuring instrument over a RS232 serial port. Everything works fine, but every time I turn on the PC (Windows 10) the communication doesn't work in the beginning. I have to open a serial terminal (for example hterm) press the "connect" and "disconnect" button. After that the Python script works as expected, reading and writing to and from the instrument is no problem. Here is a short example of the code:
...ANSWER
Answered 2020-May-15 at 17:33If you are using a third-party tool and then the script works fine, then I think there is some garbage data present in the buffers of either side, flushing the serial port on the hardware device and on the python script too might work and verify the data being received on the hardware device it is possible garbage is being appended on the commands, also try to use some header bits which keep errors at bay in this kind of communication.
Use some serial port sniffer to verify what is being sent, like this
QUESTION
I try to control a voltage source via RS485 (via a USB to RS485 converter). I use Standard C++ in Visual Studio. I wrote the following code. Writing works fine, the voltage source responds to all input, but reading back bytes is difficult for me. For example, the answer might be the following string: "12.000" (31 32 2E 30 30 30 0A)
...ANSWER
Answered 2020-Mar-16 at 19:16You get strange signs because bytes_to_receive
is not a null-terminated string. printf
keeps reading bytes until it sees a null (0) byte. You don't put a null byte in bytes_to_receive
, so it keeps printing until it goes off the end and finds one somewhere else.
ReadFile
tells you how many bytes were read, in dwBytesRead
, so you can add a null byte for printf
: bytes_to_receive[dwBytesRead] = '\0';
.
Make sure to increase the size of bytes_to_receive
to 8 because now you are writing one extra byte. Still pass 7 to ReadFile because you don't want to read 8 bytes - you are adding the null byte yourself after reading the data.
QUESTION
I'm triying to send data from a PSoc via UART to my PC where a want to store data with Qt. The PSoc sends 3 bytes of data. Theses 3 bytes are repeatet with a frequency of 2.5Hz. When I check the signals with my oscilloscope everything is fine. When I receive the data with the software HTerm also everything is as expected. When I use my code written in c++ with Qt I get the problem that not all data are received in Qt, only one third is in the memory. I expected that the signal readyRead is emitted with every new byte? But it seems that the signal is only emitted at the begin of the package of the 3 bytes. Also my qDebug output doesn't react on changes from the PSoc. So when I change values at PSoc the output in qDebug doesn't change.
I already tried reading 3 Bytes (serial->read(3)) and then I first received some single bytes and after a few readings I get the 3 bytes I sended but this is not so reproducible.
...ANSWER
Answered 2019-Nov-03 at 09:27You are only reading a fixed size with read.
Could it be that you get readyRead signals with varying bytes available but you only read fixed size of them
In your readyRead slot try to read all available bytes.
QUESTION
I'm trying to configure my C++ application to communicate with a device using the COM port. I can currently do it using the HTerm software:
However, when I try to do my C++ implementation, I can't read any byte from the port. This is my program, based in this answer:
...ANSWER
Answered 2019-Sep-10 at 14:52Maybe you need to disable handshaking:
QUESTION
E.g. in Travis, by printing travis_fold:start:
and travis_fold:end:
, which behave like escape codes for Travis, it will fold the text away.
See here about Travis folding.
See for example this output.
The same would be very useful in general for Linux/Unix terminals. Are there any ANSI escape sequences/codes extensions which do something like this (and of course corresponding terminal emulators which handle those)?
Existing escape code (and extensions):
- ANSI colors: list
- iTerm2 list, with some extended escape codes
- hterm list
- other extensions
- collected list
- superscript/subscript: here
- hyperlink support: overview in various emulators
- images: xterm.js, sixel
- current directory information: iTerm2
- generic HTML: DomTerm (article, article), GraphTerm, GateOne
ANSWER
Answered 2019-Jan-03 at 11:08Some list:
- DomTerm: supports it (details)
- Hyper: feature request
- xterm.js: feature request
- Final Term: supports it (article) but is no longer maintained
QUESTION
Here's my current setup: I have a C++ DLL that hooks one of its functions globally to every process running on the computer. The hooking is done in DLLMain
using the SetWindowsHookEx
winapi function, and I'm hooking to the WH_CBT
and WH_SHELL
events. I also have a C# application that loads the DLL with p/invoke (LoadLibrary()
) which triggers the installation of the hooks from DLLMain
. The handlers in the DLL are sending event information to the C# app through a named pipe.
Based on what I've read on the microsoft documentary, these events will be handled on the target process's thread, and have to be installed by a standalone C++ DLL (unlike WH_MOUSE_LL and WH_KEYBOARD_LL that can be installed by any application, even straight from a C# app using p/invoke).
So far everything works fine; the managed app is receiving data as it should. The problem arises when I shut down the application, because the handlers are still hooked, and therefore the DLL file is in use and can't be deleted.
Since the handler is not running in my application, but instead it's injected into other processes running on my computer, the C# app can't just simply call UnhookWindowsHookEx
or FreeLibrary
, because the pointer of the event handler belongs to other processes.
The question:
How can I trigger an unhook routine from the managed application that makes sure that the DLL is not in use anymore by any process?
Here's what i've tried:
The only solution that I wan able to come up with is to create an exit event (with CreateEvent
) and every time the handler receives WH_CBT
or WH_SHELL
message, it checks if the exit event is set, in which case it unhooks itself from the process it belongs to and returns before processing the message.
The problem with this approach is that after I shut down my application and unload the DLL, I have to wait until the remaining processes receive an WH event at least once, so the handler belonging to them can unhook itself.
Here's the code of the DLL:
...ANSWER
Answered 2018-Oct-15 at 21:05"The hooking is done in DLLMain" - that is the completely wrong place to handle this.
Every time the DLL is loaded into a new process, it is going to install a new set of Shell/CBT hooks, which you DO NOT want/need to happen. You only need 1 set.
The correct solution is to have your DLL export its InstallHooks()
and RemoveHooks()
functions, and then have ONLY your C# app call them AFTER it has loaded the DLL into itself. That single set of hooks will handle loading the DLL into all running processes as needed WITHOUT you having to call SetWindowsHookEx()
each time.
Also, DO NOT call UnhookWindowsHookEx()
from inside the hook callbacks themselves. Before the C# app exits, it should call RemoveHooks()
, which can then signal the hTerm
event before calling UnhookWindowsHookEx()
. The callbacks should simply exit if Continue()
returns false, nothing more. But DO NOT skip calling CallNextHookEx()
even if Continue()
returns false, as there may be additional hooks installed by other apps, and you DO NOT want to break them.
Try something more like this instead:
QUESTION
I have the nucleo board (nucleo-L4R5ZI) and want to write a code to be able to send data from a uC to a PC via the USB. I followed some tutorials, used STM32CubeMx, other solutions found across the Internet, but anyways I failed. I can open the vcp on the PC side (using Hterm, TeraTerm and Realterm), but cannot get any data.
I use Eclipse and the buildin debugger, which I flashed to JLink.
The main loop:
...ANSWER
Answered 2018-Jul-27 at 11:07This part look suspicious:
QUESTION
DECSET 1006
The encoding takes the form of CSI < Cb ; Cx ; Cy M when a button is pressed, and CSI < Cb ; Cx ; Cy m when a button is released, where:
...
ANSWER
Answered 2018-Jul-30 at 20:28Scroll wheel left/right aren't detected by xterm, hence undocumented: there's no predefined X event which corresponds to this (though some creative use may have been made for a particular device). If you're unsure about that, xev
is useful for showing the events (though interpreting them can be hard).
Regarding the link, it doesn't appear to be complete, unless you're using hterm. In any case, it's moved.
On the other hand, xterm detects scroll wheel up/down by button 4/5, using the translations
resource (see the default key-bindings in the manual). The names Btn4Up
, etc., are predefined in the X ToolKit to correspond with X events and (having been introduced in X11 in 1987) predate by roughly ten years their use for wheel mouse encoding. While it's possible to extend those events, I haven't seen that it's been done (or used by vim, for that matter).
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