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C6654 EMIF+EDMA3实现ping-pong buffer或者环形buffer传输例程?

我目前做一个项目,需要实现C6654通过EMIFA高速读写FPGA的双口RAM做算法处理,要用EDMA3实现ping-pong buffer或者环形buffer,有没有相关的例程可供参考?