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Newest 'serial' Questions - Raspberry Pi Stack Exchange
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Learn more about TeamsQuestions tagged [serial]
is the process of sending data one bit at a time, sequentially, over a communication channel or computer bus. Traditionally "serial" relates to a three (or more with hardware handshaking) wire system (TIA-232-F), now using ∓25V Voltages. Technically speaking the specialized SPI (Serial Peripheral Interface) and I2C (Inter-Integrated Circuit) buses are serial communication systems as well - use one of those tags if they would be more appropriate!
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2
votes
1
answer
101
views
Unexpected characters at serial port opening (Arduino Mega to Raspberry Pi via TTL-232R)
I'm using an Arduino Mega to send data via serial communication to a Raspberry Pi 5. The connection is made through a TTL-232R cable (TTL serial on the Arduino side, USB on the Raspberry Pi side). On ...
2
votes
2
answers
338
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
1
answer
174
views
Modbus RTU serial communications
Is it possible to connect up a rasp pi to communicate to a generic ModBus industrial control board using serial communications I think with GPIO pinning and UART? Or would you recommend using some ...
0
votes
0
answers
54
views
0
votes
0
answers
55
views
Raspberry pi zero 2w serial communication error with sc16is740 on spi1
I have a raspberry pi zero with spi0 connected to w5500 and spi1 connected to sc16is740. The w5500 Interrupt pin is connected to GPIO25 and RsTn pin is connected to GPIO17 while the sc16is740 ...
0
votes
0
answers
52
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 ...
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
381
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 ...
-1
votes
1
answer
77
views
Unable to use UART and Bluetooth in RPi3 with audio output simulatneously
I am using Rpi 3b+ and I am trying to use the Bluetooth and UART simultaneously.
with ls -l /dev:
Serial 0 - ttyAMA0
Serial 1 - ttyS0
I had to use the UART (for reading coordinates in GPS) and ...
0
votes
1
answer
64
views
2
votes
1
answer
2k
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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 ...
-1
votes
1
answer
181
views
Rpi Pico receiving on multiple UARTs by C-SDK [closed]
How make by C-SDK
same Rpi Pico receiving on multiple UARTs
0
votes
1
answer
666
views
Communication between two RP2040 devices with micropython
I have two RP2040 devices, one a Raspberry Pi Pico W(H), and one a Waveshare RP2040 LCD 1.28 device. I am trying to send data from the Waveshare to the Pico through a USB cable (USB-C on the ...
0
votes
1
answer
278
views
How to disable sysrq on UART
I am trying to talk to a device over serial (ttyAMA0 or serial0) and it works, but sometimes I get the following TX from my rpi4, which crashes the device I talk to:
[22763.820857] sysrq: HELP : ...
0
votes
0
answers
124
views
Timeout Issues in PySerial. Arduino randomly starts timing out
from get_connected_arduinos import get_arduinos
serial_devices = []
def initialize(serial_device):
print("initializing", serial_device)
try:
serial_device["serial"]...
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