Flowcode Support Board

Hello ESP32 experts,
Hello Matrix team,

I would like to write to the following ESP32 UART register in order to invert the output signal:


UART_TXD_INV Set this bit to invert the level of the UART TxD signal. (R/W)

Can sombody please teach me what is the correct C-code /syntax in order to change this UART register.

Many thanks in advance
Dirk

Hi Dirk,
The function you need is ...

esp_err_t uart_set_line_inverse(uart_port_t uart_num, uint32_t inverse_mask);

Where uart_num is 0,1,2 etc, corresponding to Flowcode Channels 1,2,3
So if you are using Channel2, UART1, then the C code you require is ...

Hello Leigh,

wonderful perfect support!!!!

I can confirm it works in ESP32 hard. Pls. see following Scope Screen Shoot.

Many thanks!!

Dirk

Hello Leigh,

today I came again into the need in order to invert ESP32 UART lines. Since the above TX invert commands works very well I have the need to invert the UART RX line too.

I`ll tried modified command but unfortunately this is not working. At least if you put that command in the C-Box it re-inverts the TX line back.

Any ideas are welcome to overcome this problem.




BR
Dirk

Hi Leigh,

I played a bit with the Syntax / Command and my the following was accepted by the compiler and the TX output is inverted too.
In the next days I can check if the UART RX port is accepting the inverted incoming signal too.

Further thoughts from your side are still welcome.

BR

Dirk

Hi Dirk,
Yes, that's the correct way, as the second parameter is an ORed mask of the wires that need to be inverted
Leigh