a Universal Asynchronous Receiver/Transmitter, better known as serial port

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Is it possible to use the mini UART and PL011 UART together on a rpi B+? [duplicate]

How to get more than one uart interface is a quite interesting question that I was not able to fully answer for my rPi Model B+ v.2 - the one with the extended 40pin connectors. To avoid this beeing ...
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15 views

Serial line hangs after first call

I have written a short program to monitor a serial line using the uart on GPIO-Pin 8/10. It works fine the first time I start the program, but hangs without any output the 2nd time I call it. To be ...
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0answers
33 views

Connecting Adafruit NFC breakout and serial console at the same time

I am electronics newbie but have some programming background. My current hobby project is to make a "thing" which does things based on which NFC badge is waved at it. The tutorial [1] I am following ...
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2answers
99 views

9 Data Bits on UART pins?

I am wondering if it is possible to send 9 data bits framed with a start/stop bit at 1.25MBaud. I am currently using PySerial to configure the UART pins on the pi. I've stumbled across a few ...
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2answers
40 views

ttyAMA0 disabled but still shows one boot message

I'm trying to use the UART for my own purposes. I'm using Raspbian I've edited cmdline.txt and inittab but I still get the one line message Uncompressing Linux... done, booting the kernel. How ...
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1answer
43 views

UART cannot send

UART on my pi cannot send data, I can receive data from another machine, but I cannot send any data using the 'tx' pin of UART. I also try to connect 'tx' and 'rx' on my pi, but still no data is sent ...
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21 views

PIGPIO: Can child process use the parent initilized pigpio library?

I have a parent process (which is a basic tcp server). This process calls gpioInitialise() before forking a child process which polls gpio pins for input. After forking the child, the parent process ...
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19 views

SPI to soft UART

Is there a way to use the SPI on pi for UART communications without any external hardware? Is there a library in C for this?
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89 views

RPI ERROR: Unable to open NFC device

I am currently following this guide: https://learn.adafruit.com/adafruit-nfc-rfid-on-raspberry-pi/testing-it-out After completing all the steps - inputting into the console: $ cd examples/ $ sudo ...
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366 views

Receive data from uart! Raspberry Pi mono c#

I'm new and I wanted your help please... From today, after updating libraries Mono C# on my Raspberry Pi Rev 2 Type B (wheezy), the communication via serial no longer works, it seems to me very ...
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339 views

Set default baud rate on /dev/ttyAMA0 and keep after reboot

I have a ITead Studio GPS attached to my RasPi Model B 2.0's UART serial port and it's specifications require baud rate to be set at 38400. I am using gpsd on Raspbian, which attempts to use baud ...
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1answer
66 views

Identifying USB devices [closed]

I have several RS232 to TTL UART converters plugged into my Pi. The problem is that their device assignments change sporadically. Sometimes the first device gets /dev/ttyUSB0, and another time ...
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1answer
138 views

Debugging problem with GPIO serial pins

I've been trying to run a port of a small RTOS called ChibiOS on my Raspberry Pi, and am having trouble with the serial communications. Specifically, when I use a UART connected at 3.3V to the GPIO ...
2
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1answer
164 views

Disable Raspberry Pi UART

Is it possible to disable UART in Raspberry Pi?? I undid what I have done to enable UART in Raspberry Pi, but UART pins(8 and 10) can't be freed because when I tested with an LED, it glows on ...
2
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1answer
208 views

Redirecting stdout and stderr to UART

I am building my own cross-linux-from-scratch (CLFS) system for Raspberry Pi. I already build whole system, I prepared SD card and now I try to boot. I am redirecting all kernel output to serial ...
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2answers
417 views

UART/Serial communication w/ mono

I have a diplay w/ touch functionality, that communicates via either I2C, SPI or Serial (datasheet). I want to use it in a mono-application. The display has sufficient power and is connected ...
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3answers
449 views

RF transceiver and XBee module, both need UART?

I'm working an a home automation project, using a Raspberry Pi. What I want to do is connect an RF 433 MHz transmitter to control RF-controlled light switches, and a ZigBee/XBee module to connect to ...
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0answers
230 views

Real Time Acquiring of ECG waveform and display on a web page for Raspberry Pi

Is it possible to display ECG waveform on a web page in real time for Raspberry Pi?? If so, please tell me how?? The ECG waveform will be acquired by MSP430 and will be sent via the serial port to ...
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1answer
86 views

remote command execution over UART

I have connected my computer to the raspi over UART and was wondering if I could remotely execute a command. My intention is to log stats of my raspi CPU usage on my computer at specific intervals. I ...
2
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1answer
430 views

Testing bluetooth communication on RaspberryPi

I am a beginner at RaspberryPi programing so I hope the question doesn’t sound dumb. I would like to test a communication between two bluetooh modules in SPP mode. Is it possible to connect them both ...
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2answers
679 views

Virtual UART ports

I want to use a Rpi to interface with 3 atmega ics in an embedded system but the pi seems to only have one uart port. I know arduino can emulate a serial connection over two io pins, will this be ...
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1answer
1k views

Enabling the UART port on a Raspberry PI

what does this statement imply: By default the serial port on the Raspberry PI is configured for console input/output. dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 ...
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1answer
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using serial interface /dev/ttyAMA0 crashes Raspberry Pi

I've disabled console on the GPIO serial interface, lowered the speed to 9600 and had some communications observed with minicom and a simple cat /dev/ttyAMA0 talking to an arduino all ok. Now for ...
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2answers
450 views

Disable DTR on ttyUSB0

I'm connecting from Pi to Arduino-clone board. The problem is, that I need to disable DTR line, in order to prevent Arduino from resetting on connect. I have read that on RPi is not possible to ...
2
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1answer
344 views

Same output on TXD and RXD

I wanted to read some data from an external microcontroller via the UART, but couldn't get any communication working. After checking the RXD and TXD pins, I saw that there is also a signal on the ...
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132 views

Can I use the TX pin as a normal GPIO output alongside serial communications on the UART?

I'm using the raspberry pi's UART to interface with a third-party radio. At startup, the radio reads its RX pin (the pi's TX pin) to determine which baud rate should be used. I'm using Gordon's ...
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1answer
1k views

Problem with UART

I've a Raspberry Pi Model B. I want to connect its serial output to my PC and view the logs generated by it. My serial to USB converter board uses FTDI FT232RL and supports both 3.3V and 5V (using a ...
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1answer
221 views

Is there a way to make a regular GPIO pin into a Tx UART pin?

I'm working on a project that is going to need two different UART interfaces. Is there a way to make a regular GPIO pin into a Tx UART pin, I don't need an Rx pin too. Is there a software solution ...
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3answers
340 views

UART sends but not receives but works if tx-rx are bridged

I havve this strange problem.. When I connect TX and RX pins together (GPIO 14 and GPIO 15, Rev1) and I run minicom, I see everything that I type.. so it works. But when I connect Tx Rx with an USB ...
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1answer
537 views

Why am I seeing some garbage bytes at the serial console login?

When I log into my serial console using screen /dev/ttyUSB0 115200, I see some garbage in the output: �� Arch Linux 3.6.11-10-ARCH+ (ttyAMA0) raspberry login: root �Password: Login incorrect ...
2
votes
1answer
670 views

Raspberry Pi on AVC-LAN / IEBus

I'm planning on using my Raspberry Pi in my car as an XBMC server. I'll be able to select songs/videos using the Android remote control app, but it occurred to me that it would be really neat if I ...
2
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1answer
866 views

USART resending Problem via console

I have some trouble with my USART interface. I short-circuited the RX and TX pins and tried to test sending stuff via the cli using these commands: sudo stty 200 -F /dev/ttyAMA0 cat /dev/ttyAMA0 ...
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248 views

Receive on usb bluetooth and send it to uart

Is there any easy way to receive data on cheap usb bluetooth dongle and all of data send to the UART in raspberry? Thanks for the answers!
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1answer
309 views

Do I even need a second board?

I am trying to use Raspberry Pi to stream and audio/video feed, and will probably be installing FFmpeg to do most of the work. I am trying to connect a camera and a microphone to the Pi board so that ...
3
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2answers
3k views

UART serial interrupt routine

Is there a simple way to use the registers as an interrupt trigger? I can make the application run in a new pid and poll for serial input using fork() I just need to read data, no write needed This ...
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6answers
5k views

How to get more than one uart interface

Ok, I have one uart interface (TXD GPIO 14, RXD GPIO 15). I want at least one more uart interface. Possible solutions: Bit banging: Use two unrelated spare GPIOs. I understand that timing is a ...
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2answers
1k views

UART Output working on 57600 Baud but with 115200 only gibberish

I've got a strange problem with serial output. Using Wheezy and 8 Databits, 1 Stopbit, NoFlowcontroll, NoParity (config as stated in eLinux Wiki). With 57600 Baud everything works fine but with 115200 ...
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3answers
664 views

How do I connect my printer to the serial GPIO pins?

I've purchased a Mini Thermal Printer from Adafruit. The documnetation states: This printer is ideal for interfacing with a microcontroller, you simply need a 3.3V to 5V TTL serial output from ...
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2answers
9k views

How do you set the UART speed?

How should you set the baud rate of the UART Bonus question: What baud rates are available on the RPi? Edit: Since reading up from Steve's answer, I have found that there are two UARTs available. ...