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TMS320C6748: 串口收数

Part Number: TMS320C6748

C6748通过UART2接收外部串口设备发送的数据。如果C6748程序先运行,然后外部串口设备再发数,C6748可接收外部串口数据;如果外部串口设备先发数,C6748后运行,则C6748串口(UART2)接收不到外部数据(进不了UART2的中断服务函数),请教这是哪里的问题?C6748串口程序哪里有问题?