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