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Posted on October 01, 2012 at 09:55Hello, I try to use the usart1 pa9 as tx and pa10 as rx with the following code  /* Enable GPIO clock */  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);   //PA9 ,PA10  /* Enable USART clock */  RCC_APB2PeriphC...