I am trying to communicate between a serial port on a motherboard and a usb ftdi chip.
The ftdi chip is plugged into a windows machine and is assigned the label COM3. I used putty to set the baud rate to 115200, 8 bit, no parity, no flow and 1 stop bit:
The serial port on the motherboard has the standard pinout,:
And I have the grounds connected and the rx/tx connections properly swizzled.
I am running ubuntu server 18.04.2 on the machine with the serial port and I am using tio to setup the serial port:
clifford#Ryzen-Server:~$ sudo tio --baudrate 115200 --databits 8 --flow none --stopbits 1 --parity none /dev/ttyS0
But all I seem to be able to send/receive is gibberish:
So I have obviously missed something, but I am not sure what. If anyone has any ideas, I would appreciate the help.
Related
I am using SIM7600 module with Beaglebone board connected thru UART2. It works well with ppp on /dev/ttyS2.
Since the application wants the GPS info simultaneously, trying to use CMUX with the n_gsm driver as given here
https://github.com/Rtone/cmux
The modem responds with OK for AT+CMUX=0,0,5,127,0,0,200.
The tty devices for the virtual ports 1 to 4 are created in the linux - /dev/ttyGSM[1-4].
But no serial port utilities work.
Anyone has any experience in this.
i am working on a distance sensing app for android using arduino and ultrasound sensor.I found code that uses Abd for communication between android and arduino. The Abd used is for Arduino mega which has many more ports as compared to arduino Uno.I searched for Adb for uno but couldn't find it can anyone help me in finding Adb for Uno.If nothelp me with mapping of I/O ports form mega to uno.
int the adb of Mega :
DDRE 0x40 refers to Port E bit 6
DDRJ 0x08 refers to Port J bit 3
DDRJ 0x04 refers to Port J bit 2
So I need to move those IO pins to pins that Uno supports within Ports A,B,C,D and change the the DDRE & DDRJ references accordingly.
For two devices to communicate through USB one of them must act as a HOST device.
When connecting Arduino to your PC, your PC is the host.
When connecting Android to your PC, your PC is the host.
When connecting Android to the USB port of Arduino Mega, Arduino is the host.
If you (somehow) connected Android to Arduino UNO's single USB, There are no host and so they can't communicate.
You can over come this limitation by buying Arduino Uno's Host Usb Shield and connect Android to that Shield.
I've got my sim900 module working with arduino by using their software serial library, however, I want to eliminate arduino from the equation and have serial communication directly to sim900 module.
I'm using putty as my terminal emulator. It's serial is configured to COM1 19200 8 N 1 the same as device manager configuration for this port.
I connect straight from hardware serial on my PCs motherboard into serial-to-ttl interface board which connects to sim900 module. The board has 4 pins - VCC GND TX RX. They're all connected to my sim900 hardware serial as follows: VCC=5V GND=GND TX=TX RX=RX (Yes I know that it's always actually TX=RX and RX=TX, but when I connect it that way my interface board doesn't blink any led to indicate a transfer whereas it does when I connect TX=TX and RX=RX). The switch on the module is set to hardware serial pins as well.
So the only thing that happens when I send AT commands such as AT or ATI and press enter is that puttys cursor comes back to the beginning of command that I typed. No response.
I'm thinking that I'm not doing something that the arduinos software serial port is doing when it sends commands to sim900.
Can anyone help please ? It's literally been days of trying different configurations with no results.
In that time besides getting sim900 working with arduino software serial I verified that the hardware serial port on my motherboard is working correctly and the interface board is working correctly as well.
I am currently connecting 2 PCs using serial communication and at this time I am using a USB to Serial converter, then a serial cable, then another USB to Serial converter going into the other PC in order to get the communication sent and received.
Is there a way to program the USB ports as COM ports without these converters and still be able to transfer the serial data over the USB using software rather than hardware, thus eliminating the need for the conversions and rather have just a straight USB cable to USB cable connection?
Thanks!
Background
I am trying to connect to a serial GSM - modem of Wavecom type.
I was able to communicate with the modem using the guide
http://www.easysw.com/~mike/serial/serial.html
on my Ubuntu machine.
but when I tried to connect it through a device with serial port and running on Linux kernel Linux 2.6.14.7-tiny1-WR1.3al_small I get junk data returned. I have tried all of the baud values to connect to the modem. It connected on 115200 baud value when it was working, but the same value does not work from this Kernel. Its a ARM target machine. note : I cross compiled the code for ARM
Question
Do I need a driver for a modem to just be connected through a serial terminal Program ?
Please make sure that the RS232/TTL converter of your ARM board is working correctly. for example you can connect it to your Ubuntu machine at first and transmit something with a terminal program.
question : 1 ) Do i need a driver for Modem to just be connected through a Serial Terminal Program ?
No.You can connect to your GSM modem simply by having a serial port and a terminal program.