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CCS环境下，和FPGA通信（简单的传送数据），第一次通信成功后，再次通信陷入DOORBELL循环，必须重启才可以。求大神解答~陷入的循环如下：
#define DOORBELL (*(unsigned int *)0x02900180)
是doorbell没发过来么？
重启DSP就能OK？还是要重启FPGA?
全部重启，硬件软件都重启
全部重启
