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`1. Ho e
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`2. How to Use F astRPC to Offload from CPU to Qualcomm® HexagonTM DSP
`
`How to Use FastRPC t0 Offload from CPU to Qualcomm® HexagonTM DSP
`
`Thursday 7/23/15 01:00pm
`
`| P
`
`osted By Jack May
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`Up 1
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`What do drones, robots and cameras have in common?
`
`They can all take advantage of the DSP for higher performance in real-time tasks. In drones, that means flight control; in robots, that means balance
`and walking; and in cameras, it means image pre- and post-processing. Offloading real-time tasks from the CPU to the DSP is a big step toward
`higher performance, with the sweetener of much lower power consumption.
`
`How To Use HexagonTM DSP And FastRPC
`
`
`Our Hexaoon SDK exposes FastRPC, a remote procedure call framework allowing clients to transparently make remote method invocations between
`the Qualcomm® SnapdragonTM processor (APPS) and the application DSP (aDSP). It’s available now on the Snapdragon 8074 built into the
`DragonBoard 800, a product of Intrinsyc Technologies Corporation, as well as the 8084 and 8994.
`
`FastRPC is designed around several features that make offloading tasks as easy as possible:
`
`I
`
`Initiating the remote invocation looks the same as if you called it locally, you provide the function definition via IDL (Interface Description
`Language).
`- Tools auto-generate interface header and libs to handle parameter passing, cache coherency.
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`a For FastRPC calls into dynamic modules the framework loads the aDSP module for you.
`- FastRPC is synchronous That eliminates the complexity of having the kernel manage state between aDSP and APPS in an asynchronous call.
`
`The diagram shows the invocation of a single method in which the client resides on APPS (e.g., Snapdragon CPU) and the object resides on the aDSP
`(e. g., Hexagon). The stub and skel are auto-generated, you only need to call the function from the applications processor and provide the
`implementation of that function on the aD SP.
`
`j method
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`RDSPRP '
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`Driver
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`
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`ADSFRFC .
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`Framework l
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`|
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`Applications PFDCESSOI‘
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`I
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`I
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`aDSP PI'OBEESOF
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`I
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`On an Android device that supports FastRPC, these are the steps to get your job offloaded to the aD SP.
`
`1. Download and install the Hexagon SDK.
`2. Describe your job’s API in IDL (Interface Description Language).
`3. Auto generate your header, and the stub and skel libraries.
`4. Implement your API on the DSP, link it and the skel library into a shared object, push the shared object to the device.
`5. Link the stub to your android native app and call your API.
`6. (Optional) Create java bindings for your API and call you API from an APK.
`
`That’s it.
`
`A Drone Developer Kit?
`
`Not exactly.
`
`But we’re seeing developers take the Snapdragon processor in that direction, and the Hexagon DSP goes with it. You can do plenty more on the DSP
`than just multimedia, so dig in and find out for yourself.
`
`If you’re a drone or robotics developer looking for faster execution of real-time tasks with lower power consumption, apply for access to the Hexagon
`SDK. It includes full documentation and code samples for invoking FastRPC.
`
`And stay tuned for more how-to’s and use cases involving Hexagon.
`
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`Related Blogs:
`
`
`Hetero eneous Com utin :.An Architecture and a Techni. ue
`
`DSP Libraries for Computer Vision and GEMM in Hexagon SDK 3 .1
`
`Guest B10 ; Customize the
`ualcomrn Hexa on DSP, It’s aDream Come. True.
`
`Keep Calm and Customize a DSP — Hexagon SDK 1.0 Launches
`
`Related Tags:
`
`- hexagon sdk
`
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`'JackMay
`Jack May works for Qualcomm Technologies, Inc. (QTI) where he is responsible for the Hexagon SDK. Jack has been working with multimedia and
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