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E (100167) uart: uart_set_pin(559): tx_io_num error
Posted: Wed Aug 17, 2022 9:36 pm
by cederom
Hello world
I have problem running UART in the following configuration:
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UART(1, tx=19, rx=35, baudrate=115200)
I get this error:
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E (100167) uart: uart_set_pin(559): tx_io_num error
According to QuickRef (
https://docs.micropython.org/en/latest/ ... serial-bus):
Any GPIO can be used for hardware UARTs using the GPIO matrix, so to avoid conflicts simply provide tx and rx pins when constructing.
The setup is:
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MicroPython v1.18 on 2022-01-17; ESP32 module with ESP32
Any hints welcome
Re: E (100167) uart: uart_set_pin(559): tx_io_num error
Posted: Thu Aug 18, 2022 2:59 am
by marcidy
no problems on v1.19.1 using an ESP32 devkit-c-v4
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>>> from machine import UART
>>> u = UART(1, tx=19, rx=35, baudrate=115200)
>>>
Re: E (100167) uart: uart_set_pin(559): tx_io_num error
Posted: Thu Aug 18, 2022 3:04 am
by cederom
Well, turned out to be my bug
Some part of the code that was defining the hardware on the fly swapped 19 with 35 and obviously IO35 can be input only
Sorry for the noise!!
By the way, I have managed to successfully use UART1 to serve two different devices attached to a different GPIO ports, one at time, by calling
with different parameters, and that makes code portable among ESP32 and ESP32-C3 (C3 has only two UART, one used for System Console)
Note:
does not only turns off the port but also destroys the object and it cannot be initialized again
I have proposed a PR that updates documentation a bit:
https://github.com/micropython/micropython/pull/9067.