ESP32 pico uart problem 115200Bd and 921600Bd

Post by **stefan.erni** » Thu Oct 02, 2025 2:11 pm

Hi Ben

I like to use M5 Atom lite, because it is very small board.

https://docs.m5stack.com/en/core/ATOM%20Lite
The connection to the pc is just working correctly if I add an IRQ in the program

And with 921600Bd it's received always wrong char even with IRQ.

Unfortunately, it doesn't work any better with the Atom S3 and Atom C3.
viewtopic.php?t=3223

working nice

: 2025-10-02_14-40-08.PNG (100.38 KiB) Viewed 39 times

Not OK without IRQ

: 2025-10-02_14-38-35.PNG (101.55 KiB) Viewed 39 times

post_uart_speed1.fcfx: (10.78 KiB) Downloaded 4 times

.
remark to 921600Bd:

With an ESP32 WROOM 32E and CH340C, the connection to the App Developer works perfectly with 92100Bd.

: 2025-10-02_15-01-22.PNG (479.87 KiB) Viewed 39 times