Troubleshooting • Huge Latency When Receiving Data Through UART

Hi,

I'm trying to receive data from a LiDAR sensor using a UART on my Raspberry Pi 4. Since I'm already using UART 1 for other purposes, I've enabled UART 2 by adding to my /boot/config.txt. I'm using PySerial to open and read data from the serial port.
Here is how I'm connecting to the port:When I continuously print the output of the LiDAR sensor to the console, there is about 5-10 seconds of delay until the proper value is displayed. If I instead use a USB-to-serial converter and connect to /dev/ttyUSB0, there is no delay and everything works fine. For this reason, I feel like the Raspberry Pi is somehow introducing latency. I've tried switching to UART 3, instead of UART 2, but the same latency appears.
I don't know much about serial communication, so I would appreciate any insight into why there is such a big delay when using the Raspberry Pi UARTs.

Thanks!

Felix

Statistics: Posted by felixxperron — Fri Mar 15, 2024 8:45 pm

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