f9micro/f9-kernel — pull request #85 by KunYi (2014-04-18 14:02:50+00:00)
Title: fix debug port use USART1 can not work bug.

Because RCC enable bit of USART1 is RCC_APB2RSTR_USART1RST (bit4)
not RCC_APB1RSTR_USART2RST (bit 17)