ced7d5a34f
According to STM32 Manual, the USART RXNE flag will be clear automatically after read to the USART_DR register[1], so the call to USART_ClearITPendingBit is unnecessary. [1]: See RM0090 Reference Manual p.992, Bit 5
board info: STM32F4 discovery http://www.st.com/internet/evalboard/product/252419.jsp note: in drivers/stm32f4xx_conf.h /* Redefine the HSE value; it's equal to 8 MHz on the STM32F4-DISCOVERY Kit */ #define HSE_VALUE ((uint32_t)8000000)