本程序是上位机与DSP通讯，DSP以FIFO的接收中断方式接收上位机的数据，再将数据发回给上位机-This procedure is the communication between PC and DSP, DSP receiver FIFO interrupt to the host computer receives the data, then the data is sent back to the host computer

下面代码是基于DSP28系列的DSP通信源代码，此段代码对需要了解SPI的中断的同志会有很大的帮助。-The following code is DSP28 series DSP communication based on the source code, this code on the need to understand the SPI interrupt comrades will be of great help.