It will be possible communicates with 7 bits + 2 stop bits, in Stm32f103c8t6?

[A Bravos]

I need to make a device that communicates (modbus) with a product that uses the rs232 protocol, with 7 bits and 2 stop bits. I use CubeMx and HAL libs. There is some process to do this. As is known in STM32, only have 8 and 9 bits in length.

[Tesla DeLorean]

The stop bit is just a high bit, the UART shifts least significant bit first. Worst case you should be able to mask DR on reads, and OR on high bits on writes to DR

[A Bravos]

Thank you Clive Two.Zero for your response.

I think DR (reading / writing) means date? But what's the setup on CubeMx? 8bits N 1 or other option.

Thanks for the information

Bravos

[Tesla DeLorean · Accepted solution]

Yes 8N1 would work

Sending as

USART1->DR = data | 0x80;

Receiving as

data = USART1->DR & 0x7F;

[A Bravos]

Thank you again Clive Two.Zero for your response.

It's working