UART Echo Example not working as expected in ESP32C3 Qemu (QEMU-150)

[lcgamboa]

The idf UART Echo Example not working as expected in ESP32C3 Qemu.
In the figure below on the left is the output on a real C3 chip and on the right the output of Qemu's ESP32C3 for keys typed in sequence ( 1, 2 , 3 ...).

The example works correctly with Qemu for ESP32.

[o-marshmallow]

Hi @lcgamboa ,

Thanks for reporting this issue. As far as I know, this example requires an external USB-to-UART adapter as it uses another UART controller than the default one, with given pins from Kconfig.

I cannot reproduce what you are getting, even on the real chip. What is your configuration for this example?

[lcgamboa]

I'm sorry I forgot to let you know that I modified the code to use the default pins for ease of use with many different processors. I modified the lines 29 and 30 of file uart_echo_example_main.c from :

#define ECHO_TEST_TXD (CONFIG_EXAMPLE_UART_TXD)
#define ECHO_TEST_RXD (CONFIG_EXAMPLE_UART_RXD)

to:

#define ECHO_TEST_TXD (UART_PIN_NO_CHANGE)
#define ECHO_TEST_RXD (UART_PIN_NO_CHANGE)

[o-marshmallow]

Hi @lcgamboa ,

Thanks for the details, I also needed to use the UART port number 0 in the menuconfig to reproduce the issue.
I will investigate this issue.