Hi, @eng.m_mahmoud
This is the UHCI example, but please know that this is just an example, it may be unstable. you can refer to it and rewrite your own driver
thanks !!

Hi, please try the master branch.

I mean the non-PDM mode configuration

Hi, @chris_oz

I saw the datasheet, The documentation says that this MIC uses a industry-standard 24-bit I²S interface. When using the I2S interface, what are your configuration parameters?

The serial ports used by master esp32 as shown in the attachment picture. You mean when serial1 and serial2 are not sending data,output high level, will cause serial0 to a intermediate level,and the serial sending would be abnormal? If all of the 3 serial ports are sending at the same time,output l...

I think this may be the reason. For example, when A needs to send data to D. At this time B and C are in the IDLE state( output high level). the low level of A output will be pulled by B and C, at intermediate level (perhaps 1.5V) . Can you look at the waveform with an oscilloscope ?

Do you use RS485 or directly connect the gpio of the four UARTs together?

Hi, lalleglad I think you don't need to use callbacks. The following code may meet your needs: #include <stdio.h> #include <string.h> #include "freertos/FreeRTOS.h" #include "freertos/queue.h" #include "freertos/task.h" #include "driver/uart.h" #include "driver/gpio.h" #define ECHO_TEST_TXD (GPIO_NU...

HI, raldone01

thank you for reporting this issue. we will fix this issue soon

Hi, kuhatovuk

Thanks for reporting this issue. We will fix it soon.