ESP32 Forum

Hello,

I'm trying to use uart_echo example as the base for my code. I want to read 4 bytes (with 4800 baud rate), then transmit them back, but the problem is I get about 20ms delay between Rx & Tx.

The code is so simple, but I can't understand what is the problem. Can anyone help me? I'm so confused.

P.S.: I tryed the uart_event example also, but the problem remains the same.

Your issue is likely that the uart hardware tries to minimize interrupts, that is, it will wait until there is no more data incoming for a while before software actually receives the data. You could set that timeout to 0 using uart_set_rx_timeout() and see if that solves the issue.

ESP_Sprite wrote: ↑

Tue May 24, 2022 1:57 am

Your issue is likely that the uart hardware tries to minimize interrupts, that is, it will wait until there is no more data incoming for a while before software actually receives the data. You could set that timeout to 0 using uart_set_rx_timeout() and see if that solves the issue.

Thank you for your support. I've tested your suggestion, but it didn't work. Plus, I'm not sure how that would work.