Software or Hardware 9 Bit

[ecevitbatu]

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.

[ESP_Sprite]

9 bits of what, from where?

[WiFive]

Uart you can use rmt or ulp

[ecevitbatu]

Uart you can use rmt or ulp

9 bits receiver with RMT or UPL and an example?

[ecevitbatu]

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.

[ESP_Sprite]

9 bits of smoke signals?

[ecevitbatu]

9 bits of smoke signals?

Incoming data is in the form of 9N1

[ESP_Sprite]

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.

[A001FF]

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)

[ESP_Sprite]

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.