practic_les1_c_usart1

WeAct BlackPill STM32F411CEU6 GPIOC Pin13 --> LED USART1 TX -->GPIOA Pin9, RX -->GPIOA Pin10 * HSI=16 MHz,APB2ENR = 16MHz * Baud rate = 115200 * Stop bit=1 * no flow control * data =8 bit *