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由 goprife@gmail.com 提交于
fix warning in usart_sim.c git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2559 bbd45198-f89e-11dd-88c7-29a3b14d5316
8951089b
fix warning in usart_sim.c git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2559 bbd45198-f89e-11dd-88c7-29a3b14d5316