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ESP32 UART and an IRQ
Posted: Thu Jun 26, 2025 9:44 am
by stefan.erni
Hi Ben
I have a small pogram to show the problem.
The uart is just working correct if I add an IRQ.
The IRQ can call an empty macro and 10 Second long

- 2025-06-26_10-32-50.PNG (116.07 KiB) Viewed 41 times
here the result without IRQ and with IRQ
without IRQ:

- 2025-06-26_10-28-00.PNG (5.28 KiB) Viewed 41 times
with IRQ:

- 2025-06-26_10-29-30.PNG (5.23 KiB) Viewed 41 times
Re: ESP32 UART and an IRQ
Posted: Thu Jun 26, 2025 11:03 pm
by mnfisher
Can't replicate this problem: Seems to work AOK using channel 1 or 3 with or without the interrupt.
This was on a 'clean' build - I use a new directory for every file - I wonder if you've changed any settings in menuconfig that are 'upsetting' the output (attempting to output something at a different baud rate??)
Do you have BT enabled?
Even so - having an empty timer interrupt seems an unlikely fix?
Try using the batch file from the last post of
viewtopic.php?t=2966&hilit=batch+file+e ... uild+speed - this gives a 'fresh' configuration for each project - just note you need to use compile to hex and set the com port in the batch file - however I use it for all eps32 projects - it it works well...
Matin