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

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Send uart commands through bluetooth

I bought a raspberry pi 3. I ordered the Move controller it's a Kickstarter project. They use the phone to send uart commands through Bluetooth and they put a Dev documentation online. What I fail ...
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21 views

Raspberry pi HMI display as input?

I would like to know if it is possible to use an hmi display such as the nextion displays with the pi as a user input display and communicate the info over to the pi using serial communication? if ...
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1answer
71 views

How to communicate between Pi 3 and an Arduino using UART from GPIO?

I need to transfer data between Arduino and Pi. I have an Pi 3, and I used a simple circuit with a voltage divider to deal with 3.3v vs 5v logic levels. But I got nothing. Then, I used only Pi3 with ...
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2answers
36 views

Trouble receiving UART data?

I am working on a project. And thetask is to collect the data from a washing machine using a raspberry pi. I have followed many tutorials, and for reference I have mentioned the steps below, Set up: ...
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1answer
24 views

How tp get USB to USB UART console without linux

I'm trying to develop my own OS kernel from scratch for the raspberry pi and I want to be able to debug my code from my computer over putty through a cable. Now I've did a little googling and found ...
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25 views

UART print is not functioning in pi 3 but functions in pi 1 [duplicate]

I have 1.disabled the serial communication using raspi-config 2.edited console=tty with /boot/cmdline.txt 3.wrote python code for both read and write (with 9600 baudrate) in both pi 1 and pi 3 It ...
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2answers
125 views

How to disable DMA when using UART on the Raspberry Pi 2

I have a latency issue when using UART on Raspberry Pi 2 and I want to disable DMA when using UART driver. I know that the Raspberry Pi 2 uses ampa_pl011 and I don't want use DMA. Can you tell me how ...
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58 views

uart interbyte time too long

I have problem about interbyte time with application using uart driver on raspberry pi 2. Interbyte time is time that each data byte sent via UART is delayed from the previous byte. With my ...
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1answer
35 views

Using RX, TX pins with IoT Core

I was trying to find some references about this topic but I didn't find any, so I decided to post this question first before buying something that won't work. Does IoT Core supports this? If so can ...
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2answers
82 views

Ultimate GPS hat gets a lock, but no data shows on ttyAMA0

I'm trying to get an Adafruit Ulitmate GPS Hat to work on my new RPi3 /boot/cmdline.txt has been modified to remove references to ttyAMA0: pi@gpsp3:/boot $ more /boot/cmdline.txt ...
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1answer
98 views

How to Create shortcut that appends text to /boot/config.txt

I am trying to do the following with a shortcut on the Desktop : echo "dtoverlay=pi3-miniuart-bt" >> /boot/config.txt systemctl disable hciuart I have tried to put it in a script but when I ...
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1answer
520 views

Pi 3 Boot with UART console

I use Raspberry Pi 3 with image "RASPBIAN JESSIE" which is 2016-02-26 build. I plug in micro-usb to power on. Then I use USB to TTL adapter to try to login. I've set baud rate 115200, and connect GND, ...
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40 views

Make sure serial data sent

I am trying to sent data to an Arduino Nano via serial using python, but it doesn't work yet. Is there a way to ensure that what I am trying to send was sent? (This is in order to understand where ...
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2answers
159 views

How to free the UART pins of Raspberry pi B+ from acting as a kernel console?

I have a Raspberry Pi B+ for my project with Raspbian Jessie OS installed on it.. I have to receive "Real-time" electric current values coming from a wireless Nordic module. So to start this serial ...
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40 views

Can't type in 'minicom' for UART communication

I am trying to communicate with another module (simcom cim900a) using UART. My Raspbian is Jessie, and I did as I saw in a few manuals, but not all of them are working for Jessie: delete from ...
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1answer
71 views

Trying to communicate over a serial connection between RPi and Picaxe 18M2 Microcontroller?

I am trying to get a serial connection between an RaspberryPi and a Picaxe 18M2 Microcontroller. I found out that I should build the following cirucit because the Rasperry and the Microcontroller have ...
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81 views

Data Communication between two raspberry pi's via GPIO

Good day I am currently implementing an autonomous quadcopter with stereo vision using raspberry Pi. One (Let's call this Pi_1) is responsible for stereo vision the other is responsible for motor ...
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1answer
179 views

Adafruit Ultimate GPS HAT Connections

I have been messing around with this GPS HAT for a few days now. I do have it working, although I have multiple modules running at once on stacked breadboards. My main question is on AdaFruit's ...
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479 views

Binary garbage on the UART when powering the RPi

I have a strange issue I cannot figure out. I have a thermal printer (https://www.adafruit.com/products/597) plugged to the UART (/dev/ttyAMAO). I configured the RPi to remove the console on ...
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3answers
783 views

True 9-bit serial port data?

I have an existing, half complete, vending machine project running on an Atmel UTC, which I want to port to the Pi. In order to talk to peripherals, such as coin acceptor, it has to support ModBus ** ...
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1answer
72 views

Strange issue on UART (via FTDI USB <--> RS-232 adapter)

I'm trying to establish a high speed UART communication. Since ttyAMA0 is not quite good at 1+ Mbaud, decided to use FTDI adapter (based on FT232RL chip) instead. I've tested an adapter on my laptop ...
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305 views

Disable UART at boot time

I am trying to shut down the UART when the Raspbian is booting and use its pins as GPIO-s.(Raspbian was installed with NOOBS.) I followed the instructions described here. I downloaded the .cts file at ...
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80 views

Using only TXD, without RXD?

Can you use the TXD pin by itself, so that the UART is read only from the RXD on the device it is being sent to? My plan is to have a transistor on the RXDI (RXD in) pin of the Pi that can be turned ...
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75 views

Bit banging/Software uart RPI2 Model B

I have model B RPI2. I am already using one uart on it. is there any software/bit-banging uart library available ? On search i found here. but it don't have any example code. ...
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49 views

Rpi to arduino via USB

I am a little bit hazy about the serial ports on the RPI. I am using GPIO pins 14 and 15 to connect to my GPS. Can I at the same time use the USB port to connect serially to an Arduino? Or is there ...
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31 views

Packet time is measured different timing by Logic analyzer during Ping are different?

I was pinging in serial line(UART) using SLIP in PI 2. Ping was reporting certain time. Also, I was using logic analyzer to check the complete duration of packet start to packet end. I found out that ...
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210 views

cannot increase UART clock frequency

I would like to increase UART speed. So, I followed this page. http://www.thedevilonholiday.co.uk/raspberry-pi-increase-uart-speed/ I added init_uart_clock=64000000 and rebooted pi. But, still I got ...
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1answer
184 views

Running Simultaneous Processes

I have a Raspberry Pi 2 Model B and am running Raspbian. I have a capture device (USB easycap) connected to the pi, and it is recognized and am able to open the video capture stream in VLC. I also ...
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69 views

UART Issues with Mono at Startup

I have developed a .NET application running in Mono on Raspbian that communicates to a PIC microcontroller via serial. The application is working well when I start it manually, however I would like to ...
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258 views

How can I make the ITEAD PN532 work on the R-Pi via UART?

I have used the Adafruit PN532 before on the R-Pi (A and B+) via UART and it works just fine but I haven’t been able to make it work for the ITEAD. The ITEAD supports I2C, SPI and UART. On this link, ...
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39 views

xterm-256color behavior on Mac OS X

I have succeeded getting a minimalist connection between my Mac and my Raspberry Pi (RPi). With one USB-Serial adapter cable, I login to my RPi and do command-line work, even using Vim to edit files, ...
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83 views

How to force RPi to wait for data from UART?

Like above: how to force RPi to wait for data from UART and do not terminate the program ? I solved my problem with connection between RPi and BT Module and Arduino but the program I wrote is closing ...
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262 views

Kernel log ONLY on serial console (UART)

How to configure kernel, config.txt and cmdline.txt to get all kernel logs (starting from boot) in serial console (UART) only? To clarify: I don't want to see any kernel log on HDMI monitor I don't ...
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119 views

Control the inclinometer with RS232 or UART

I have bought an inclinometer today to try some things. Inclinometer has two communication port; RS232 and UART. Which one should I select? Actually I tried both but none of them worked. I have ...
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1answer
293 views

Resetting a Raspberry Pi from a USB (CH340G) UART

I want to use a CH340G USB UART to connect to the console of my raspberry pis - something like this: ...
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312 views

Connecting multiple devices with UART

So, I have the following components: Gertbot SparqEE Shield My aim is to connect these to a Raspberry Pi Model B+, so that they can work together. There are no issues when I connect these ...
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1answer
832 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 ...
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186 views

Enable PL011 UART transmit/receive FIFO

How can we set pl011 uart with transmit fifo and receive fifo enable in raspberry pi?
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1answer
43 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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254 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 ...
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1answer
424 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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644 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 ...
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343 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
824 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
123 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
622 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 ...
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813 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 ...
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1answer
2k 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 ...
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2answers
7k 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 Raspberry Pi from my computer using a PL2303 USB adapter. The specifications on the ...
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183 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 ...