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

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0answers
30 views

Change the slides of ppt using UART

I am new in raspberry pi. I have interfaced the bluetooth module with raspberry pi which has UART in it. Now I want to change the slides of my ppt through the UART. How can I do this thing? I am ...
0
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1answer
24 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 ...
0
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0answers
38 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 ...
2
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1answer
82 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 ...
4
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2answers
328 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 ...
4
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2answers
515 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 ** ...
3
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1answer
46 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 ...
0
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2answers
150 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 ...
0
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1answer
53 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 ...
0
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0answers
59 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. ...
0
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1answer
44 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 ...
1
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1answer
30 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 ...
0
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1answer
141 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 ...
1
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1answer
126 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 ...
0
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0answers
53 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 ...
0
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0answers
144 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, ...
1
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0answers
32 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, ...
0
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1answer
65 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 ...
0
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2answers
189 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 ...
1
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0answers
87 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 ...
1
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1answer
239 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: ...
1
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0answers
237 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 ...
2
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1answer
559 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
143 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
40 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
210 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
314 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 ...
0
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0answers
477 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
289 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.
0
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2answers
571 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 ...
1
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0answers
106 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 ...
2
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0answers
509 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
678 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 ...
2
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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 ...
1
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2answers
5k 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 ...
1
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1answer
170 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 ...
2
votes
1answer
359 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
312 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
1k 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 ...
0
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0answers
57 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
333 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 ...
3
votes
2answers
841 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
667 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
213 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 ...
1
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0answers
171 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 ...
0
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0answers
123 views

SPI to soft UART [duplicate]

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?
1
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0answers
1k 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 ...
0
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1answer
2k 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
187 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
244 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 ...