__HAL_UART_GET_FLAG

__HAL_UART_GET_FLAG是一个宏定义，用于获取UART标志位的状态。在这个例子中，它被用于检查UART的空闲标志位是否被触发。如果空闲标志位被触发，表示接收到了一帧数据。\[2\]
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