Controlling AI Engine GMIO Transfers - 2022.2 English

AI Engine GMIO supports both synchronous and asynchronous transferring, both of which are supported by ADF APIs, and XRT APIs. Following example code shows an asynchronous GMIO implementation with XRT API:

char* xclbinFilename = argv[1];
// Open xclbin
auto device = xrt::device(0); //device index=0
auto uuid = device.load_xclbin(xclbinFilename);

auto din_buffer = xrt::aie::bo (device, BLOCK_SIZE_in_Bytes, xrt::bo::flags::normal, /*memory group*/0);
int* dinArray= din_buffer.map<int*>();
auto dout_buffer = xrt::aie::bo (device, BLOCK_SIZE_in_Bytes, xrt::bo::flags::normal, /*memory group*/0);
int* doutArray= dout_buffer.map<int*>();

int ret=0;
int error=0;
//Initialization
for(int i=0;i<ITERATION*1024/4;i++){
  dinArray[i]=i;
}

din_buffer.async("gr.gmioIn",XCL_BO_SYNC_BO_GMIO_TO_AIE,BLOCK_SIZE_in_Bytes,/*offset*/0);

auto ghdl=xrt::graph(device,uuid,"gr");
ghdl.run(ITERATION);

dout_buffer.async("gr.gmioOut",XCL_BO_SYNC_BO_AIE_TO_GMIO,BLOCK_SIZE_in_Bytes,/*offset*/0);

ghdl.wait();

//Post-processing
...