Problems with UART2 when resetting ESP32 (it has been already fixed over the web)

[euquiq]

Hi!

I use the three hardware serial ports on my ESP32. Problem is that when I restart the ESP32, UART1 and UART2 are corrupted. That is: I cannot get anything through them, no matter what.

I did google it, and found out that this already has been discussed in here and other places:

https://www.esp32.com/viewtopic.php?t=4960

But never actually been fixed.

So the manual patch for now was:

1. search for espressif\esp32\cores\esp32\esp32-hal-uart.c
2. Find the sub void uartFlush(uart_t* uart)
3. And replace the whole sub with:

void uartFlush(uart_t* uart)
{
    if(uart == NULL)
    {
    return;
    }
    UART_MUTEX_LOCK();
    while(uart->dev->status.rxfifo_cnt != 0 || (uart->dev->mem_rx_status.wr_addr != uart->dev->mem_rx_status.rd_addr))
    {
       READ_PERI_REG(UART_FIFO_REG(uart->num));
    }
UART_MUTEX_UNLOCK();
}

I am posting this iisue as reminder that the problem is still here, but there is already a "fix" (at least for me, it gives me back UART2 after an ESP.restart())

Regards,

Enrique

[me-no-dev]

Here it is :) 12ca9e8