I checked with out hw engineer and rx is indeed pulled! My hunch here is that the auto 485 creates some problems with the serial fifos, because the fifo is full but I never get the UART_DATA event. If I disable the 485 mode and do it by hand, this problem disappeares.

Hi everybody,
I'm using an ESP32 with IDF 5.4.1. I'm using all three serial ports: UART0 is for debug messages, UART1 is on an RS485 bus, and UART2 receives command. I'm mostly concerned about UART1 on the 485 mode.

I configure it quite simply:


uart_config_t poor_uart_config = {
.baud_rate ...