Is it necessary to exit a kernel in order to transfer data to host?

Hi,

There is another method. I haven't tried it myself, but it seems you might be able to use I/O channels or pipes to stream data between the host and the running kernel. In the programming guide (https://www.altera.com/en_us/pdfs/literature/hb/opencl-sdk/aocl_programming_guide.pdf), it says:

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Include an io attribute in your OpenCL pipe declaration to declare a special I/O pipe to interface with

input or output features of an FPGA board.

These features might include network interfaces, PCIe, cameras, or other data capture or processing

devices or protocols.

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I encourage you to read more in the guide and let us know how it works out.

Smith