ESP32 Forum

Hello, I am trying to read 9 bits with esp32 software or hardware, can you show me a way around this? You can share your samples with me.

Thanks.

9 bits of what, from where?

Uart you can use rmt or ulp

WiFive wrote: ↑

Sun Apr 17, 2022 2:01 am

Uart you can use rmt or ulp

9 bits receiver with RMT or UPL and an example?

ESP_Sprite wrote: ↑

Sat Apr 16, 2022 1:04 am

9 bits of what, from where?

I use two processor. One of them is ESP and the other is a different processor uart and these are connected to each other. The other processor is giving 9 bits of data.

9 bits of smoke signals?

ESP_Sprite wrote: ↑

Tue Apr 19, 2022 6:39 am

9 bits of smoke signals?

Incoming data is in the form of 9N1

Okay, so it's UART then?

In that case, refer to WiFives statement. The UART is incapable of receiving 9-bit data, so you'd have to use some other peripheral.

I think it is possible to receive or send 9 bytes using the parity bit.
SERIAL_8E1
But is it possible to set the parity bit manually on ESP UART ?
(parity = Mark / Space)

Well, you'd have to change the parity mode for each byte sent/received... which is fairly inefficient, as the UART normally uses a FIFO, but you'd have to bypass that (change parity, send 1 byte, wait until the fifo is empty etc) on Tx. Not sure how Rx would work.