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

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1answer
36 views

Cannot send data from RaspberryPi to Arduino using UART

I want to send data from RaspberryPi to Arduino UNO using UART. I tried sending my data 10 times to Arduino but it received it once. It reads as follows. Connected to PC pi: ÿpi: ÿpi: ÿ 1) I ...
0
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1answer
40 views

Enable PL011 UART transmit/receive FIFO

How can we set pl011 uart with transmit fifo and receive fifo enable in raspberry pi?
0
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1answer
18 views

UART Configuration for custom bittage

How does one configure the UART for custom data/parity/stop bits? If you give an example, can you make it 115200/16/none/1? OS is raspbian on A+
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0answers
37 views

Asynchronous Socket Server and UART integration problem [closed]

I'm developing a raspberry pi socket server that when receiving the data it sends it to UART and when receiving a data from UART it sends to the server via sockets using python . It's like Raspy ...
0
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1answer
63 views

Raspberry Pi RFID interfacing

I am trying to interface my raspberry pi to a RFID reader, to make an library management system. I have brought a RFID reader whose data sheet can be found here. I have found a python program which ...
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0answers
71 views

Connect RFID/NFC reader/writer using UART or SPI?

I have an Raspberry Pi model B, and I want to hook up this RFID/NFC reader I got. This is the one I have. It has TX, RX, VCC, and GND. When I try to hook up TXD -> RXD and RXD -> TXD (or TXD -> TXD ...
0
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1answer
126 views

Uart TxD & RxD voltage

What's voltage of RPi pins 14 & 15 (RxD & TxD)? I want to use an octocouplers, so I'm very interested in voltage parameter.
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2answers
142 views

How should I properly communicate 2 Raspberry Pi via UART?

I'm testing serial communication with Python pyserial module. I try to communicate some strings between two Raspberry Pi's ... I tested transmitter and receiver code at same device connecting it's ...
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0answers
77 views

UART serial output pin held high, can't read usable information

I'm working on a home automation project where my Pi will be interfacing several picaxe chips using an UART serial connection. Even though I've installed Minicom on the Raspberry Pi and disabled the ...
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0answers
321 views

Using Raspberry Pi with Arduino GSM/GPRS Shield

Raspberry Pi Model B GEEETECH Arduino GPRS Shield V1.0 (bought from: bit.ly/1G0KYR7) ^ Similar somewhat to: Seeed's GPRS Shield V1.0 | Link: seeedstudio.com/wiki/GPRS_Shield_V1.0 (has more ...
0
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0answers
315 views

read a RFID card MiFare 1k classic through a PN532 uart reader with serial.read()

I'm trying to read my rfid card MiFare 1k classic with a PN532 breakout board through UART with a simple python script. I installed libnfc, the nfc-poll example program reads my card perfectly fine. I ...
1
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1answer
387 views

PiGPIO Library Example for Bit-Banging a UART

The PiGPIO library http://abyz.co.uk/rpi/pigpio/index.html mentions that one of it's features is "software serial links using any user gpio". I take this to mean that you can use it to generate a ...
1
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2answers
1k views

How can I test if the serial / UART is good on a raspberry pi?

I've purchased a used raspberry pi and have followed the instructions from Wolf Paulus's Journal to connect to the pi from my computer using a PL2303 USB adapter. The specs on the PL2303 adapter say ...
1
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1answer
110 views

Is it possible to connect zigbee and a GSM modem over the same RX, TX GPIO pins of Pi?

I would like to connect a XBee module (Zigbee) and also a GSM modem for voice and SMS. From what I have seen, mostly both uses the Rx, Tx pins of Pi for serial communication. Other option would be to ...
1
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1answer
266 views

Unable receive character properly in UART

I am trying to send and receive character using UART (GPIO14 as Tx & GPIO15 as Rx). I can transmit character successfully which I can check on minicom. Now I have short my RX and Tx pin so that I ...
1
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3answers
209 views

115200 Baud Rate Problem for Raspberry Pi /dev/ttyAMA0 vs /dev/ttyUSB0 with XBee Radios

I'm have 2 XBee Radios and 2 Raspberry Pis. I have the 2 communicating with the XBee radios set to 9600 Baud on the TX and RX lines from the Raspberry Pi. I recently bumped the XBee radio default ...
1
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1answer
782 views

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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0answers
39 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 ...
2
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0answers
221 views

Connecting Adafruit NFC breakout and serial console at the same time [closed]

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 ...
2
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2answers
471 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 ...
3
votes
2answers
244 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 ...
3
votes
1answer
138 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 ...
0
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0answers
87 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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0answers
73 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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217 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 ...
0
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796 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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0answers
982 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 ...
0
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1answer
107 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 ...
0
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1answer
177 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
votes
1answer
291 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
votes
1answer
294 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 ...
1
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2answers
802 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 ...
1
vote
3answers
829 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 ...
0
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1answer
325 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 ...
2
votes
1answer
111 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
votes
1answer
624 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 ...
3
votes
2answers
1k 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 ...
0
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1answer
1k views

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 ...
3
votes
4answers
763 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
votes
1answer
448 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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0answers
171 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 ...
2
votes
1answer
2k 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 ...
2
votes
1answer
307 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 ...
2
votes
3answers
475 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 ...
3
votes
1answer
817 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
878 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
votes
1answer
1k 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 ...
0
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1answer
268 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!
0
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1answer
312 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 ...