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use STM32CubeMX to get the initialization code,but UART9 not work,use the LL LibraryUART9 initializationvoid MX_UART9_Init(void) { LL_USART_InitTypeDef USART_InitStruct = {0}; LL_GPIO_InitTypeDef GPIO_InitStruct = {0}; LL_RCC_SetUARTCloc...