I bought an hdmi switch which has a rs-232 serial port to control input and output.
The problem is that I don't have software to use that interface and no expirience programing with it.
The only thing I have is a page of documentation about the the port on the switch.
documentation
I tried using that information by typing some of the codes into a serial debugger. Obviously I had no luck with my attempt due to no expirience with the serial port.
I hope someone can help me understanding the documentation.
Thanks in advance RedCrafter_LP.
Related
My custom board with Atmel SAMD21 microcontroller (same as Arduino MKR Zero) is not making a USB port since yesterday. The board was working fine before that.
Please suggest ways to resolve this issue. What are the possible reasons for such an issue?
Since reset is equivalent to powering the board ON and OFF which has not resolved the issue, can burning the bootloader again help?
Further information:
The board seems fine. It powers ON and OFF in the usual manner.
This problem with the USB port connection happened while I was trying to upload the code.
The USB pin connections on the board have been checked as well as tested with different USB wires.
Appreciate your help.
Solutions to the problem:
External Hardware Reset -- using a reset button (that I externally managed to solder) -- to get into bootloader mode and start the program from the beginning
Burning bootloader again may also work (theoretically) - I have not tried and tested it.
For detailed understanding - follow this post - https://forum.arduino.cc/t/atmel-samd21-microcontroller-not-making-a-usb-port-anymore/882504/5
I just bough NUC120, and there is nothing less than expected. What sparked my interest is, as stated on page 17-18 on the datasheet, It able to do UART communication. So far, I only use the USB port to uploading the firmware via ISP using NuMicro ISP Programming Tools. I've noticed (correct me if I'm wrong) that its the same concept with Arduino boards, where the USB port can be used to both programming and communication. I have do my research for several days, but still can't find how to do serial communication between Nuvoton and PC, since when I do programming using NuMicro, I use "USB" connection type, and on my PC, there is no COM PORT listed.
My question, Is it possible to do serial communication via Nuvoton USB port? If its possible, can you please point me where to look?
Thanks in advance. Please tell if I should add more details about this question.
You can find the examples in the BSP documentation. Look for samples of USBD_VCOM. To be able to communicate with your PC, you have to install the driver of Virtual COM manually
Please pardon me if this question comes as a little too basic but I have tried searching almost everywhere but haven't found a clue.
I am using the esp8266 module and have uploaded the firmware in it. I have also set it as "Access point" so that other modules are able to connect with it. My problem is that I want to control it pro-grammatically through an 8051 micro-controller. I have searched online and there is a lot of documentation on how it program it through arduino, but that doesn't solve it for me. I want to use assembly language to build a serial protocol that communicates the data from 8051 to esp8266 and then to the connected modules (such as Android device).
My question really is, "would it be possible to just connect TX/RX of 8051 to RX/TX of esp8266 and write a code in assembly that transfers data as I desire to esp8266? Or, do I have to do something else?".
At the moment the only documented way for a host controller (the 8051 in your case) to talk to the ESP8266 is to use the serial port (there is a slave SPI port but the mechanism for driving it isn't known yet). So you will have to make up a little protocol to send and receive commands and data (assuming that the standard support for an enhanced AT command set isn't sufficient for you).
The baud rate can go a lot higher than the default 115200bps, if you need it to (although I'm not sure if the 8051 could keep up).
I recently completed this project with my Arduino (a fairly new hobby for me):
http://www.instructables.com/id/Make-a-24X6-LED-matrix/?ALLSTEPS
I can change the code to make whatever messages I want scroll accross the matrix but I thought it might be cool to have live information, like stock quotes, scroll accross. I think I could figure out how to do that except I would like to use it at work where there are lots of firewalls in place and I doubt Arduino software is on the approved list of programs. Is it possible to send messages to the Arduino through a USB without installing any drivers?
No it is impossible because data in Arduino is sent via serial command, the USB is only for convenience, but arduino work with FTD driver that emulate a serial connection. You should choose another type of connection bluetooth or wifi.
Hope this help you.
I am currently linux API like sigio,sigaction, etc. to interface with serial ports in Linux. And for a GUI I am using Qt 4.2. I know about 3rd party QextSerial but I would stay away from it. I also was tinkering with QSocketNotifier as an alternative.
Can someone give a rough example to read/write from a serial port using QSockeNotifier?
Here are the docs for the class. And here is an example for using QSocketNotifier with serial ports.
Also there was another question which might help you, it is written in Python, but pretty clear:
How do I watch a serial port with QSocketNotifier (linux)?