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Newest 'uart' Questions - Raspberry Pi Stack Exchange
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Learn more about TeamsQuestions tagged [uart]
a Universal Asynchronous Receiver/Transmitter, better known as serial port
383 questions
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1
vote
1
answer
49
views
Losing bytes in UART Rpi 4
I am sending a message from a PC to a RaspberryPi 4 using C232HD-DDHSP-0 through the TX and RX GPIO pins:
from pyftdi.serialext import serial_for_url
import time
import sys
def send_uart_data(...
- 139
2
votes
2
answers
320
views
Raspberry Pi update 20250402 resulted in no serial port
I just did full-update on 2x Pizero2 and on Pi 3B+ all using standard 64bit OS from the Pi imager.
Test run of program failed on serial port ... and I find that /dev/serial0 is missing.
I then ran ...
0
votes
0
answers
50
views
Sending at commands to sim7600 and not receiving a response on Raspberry Pi Zero
I have been searching for a few days but I have not found any results. I have a Raspberry Pi Zero 2 W and a sim7600 hat and I want to send at commands to it using a program I wrote. When I use minicom ...
1
vote
1
answer
294
views
Raspberry Pi 4B UART Pins
The Raspberry Pi 4B has 6 Uart Pins.
I want to use at least two of them but dont get them to work.
ls -al /dev/ttyAMA*
crw-rw---- 1 root dialout 204, 64 Oct 17 00:03 /dev/ttyAMA0
dmesg | grep tty
[ ...
1
vote
0
answers
287
views
connect RFID - RC522 directly to a PC using USB to TTL converter [closed]
I want to connect RFID - RC522 (Link: https://robu.in/product/rc522-rfid-card-reader-module-13-56mhz/) directly to a PC (Ubuntu 20.04) using CP2102(6-pin) USB 2.0 to TTL UART serial converter(Link: ...
1
vote
0
answers
98
views
Latency problem with GStreamer pipeline
I have 2 CM4 boards with 2gb(tx) and 1gb(rx) rams. I use stream transmit and receive using 2 raspberry connected with UART(921600 baud). On sender side i use this pipeline
gst-launch-1.0 -vvvv -e ...
0
votes
0
answers
39
views
Using custom baudrate on /dev/ttyAMA0
I am in the process of building an RC car, and to do this, I need to receive information from a receiver outputting S.BUS. S.BUS is a protocol that makes use of the UART running at 100000 baud. ...
-1
votes
1
answer
40
views
The Raspberry Pi 3B+ and the stm32 also encountered an error when communicating
I’m working on a project that involves communication via UART between a Raspberry Pi 3B and an STM32F103 microcontroller. Here’s a brief overview of the task:
The Raspberry Pi performs object ...
0
votes
1
answer
46
views
Receiving String Data From Secondary Arduino on Main Raspberry PI I2C
I am working on a project where I'm trying to implement 14 RDM630 RFID sensors that will send any recorded RFID tags to the Main RPi. Unfortunately, these sensors use RS232 communication, and it seems ...
0
votes
0
answers
37
views
U-Boot on alternative pins
My GPIO 14/15 pins (and I believe UART0 and UART1) are broken, so I cannot use the default serial port for U-Boot.
How can I get U-Boot to boot on a different serial port on my Raspberry Pi 4B?
0
votes
1
answer
376
views
Minimal config.txt for enabling UART0
I am attempting to connect to the UART0 on my Raspberry Pi 4B. I have shorted together GPIO pins 14 and 15 (pins 8 an 10 on the header). I then run picocom /dev/ttyAMA0 and see if it's echoing (it ...
0
votes
0
answers
167
views
how to decode sbus in uart?
I need to read the sbus signal coming from my receiver mc7rb-v2 using raspberry pi 5, I have made a signal inverter as stated in the manual of the receiver and connected to uart pin, I use pyserial to ...
0
votes
1
answer
105
views
Raspberry Pi Zero W UART, Bluetooth, and USB
I have a Raspberry Pi with Bluetooth using the /dev/ttyAMA0 and a UART using /dev/ttyS0. Is it also possible to use the USB as another UART? Are pins 14 and 15 tied to the USB as well?
0
votes
0
answers
56
views
Which UART can I use to send character to Raspberry Pi during boot process?
I am using Raspberry Pi 3 model B and Raspberry Pi 4 model B. I connect 3 pins: GND, GPIO14 (UART_TX) and GPIO15 (UART_RX) with my PC and use Minicom to display the boot message. However, I can not ...
2
votes
1
answer
2k
views
When is the 'disable-bt' dtoverlay necessary?
I have a Pi 3B+. There are a number of resources out there that suggest it is necessary to enable the disable-bt overlay in order to make use of the serial UART on GPIO 14 & 15. E.g., this ...
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