practic_les5_ada_usart1_tx

-- WeAct BlackPill STM32F411CEU6 -- USART1 TX -->GPIOA Pin9 -- * HSI=16 MHz,APB2ENR = 16MHz -- * Bps/Par/Bits : 115200/-/8N1 -- * Hardware Flow Control = No -- * Software Flow Control = No -- * --