Description
USB的传输可在后台进行;后台中断服务程序和前台主程序循环之间的数据交换可以通过事件标志和数据缓冲区来实现。当PDIUSBD12从USB收到一个数据包,即对CPU产生一个中断请求,CPU立刻响应中断。在中断服务程序中,固件将数据包从PDIUSBD12内部缓冲区移到循环数据缓冲区
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