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AppsGettingStarted.md

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Getting Started with apps processor (CPU) development

This page provides information on setting up your environment to build and run code on the applications processor (CPU).

  1. Prerequisites
  2. Building and running sample app
  3. More information on environment setup
  4. SDK capabilities and limitations

Prerequisites

Install the qrlSDK using the instructions at Development Environment Setup.

Building and running sample app

A "Hello World" sample app is included in the SDK tree.

To build the sample app:

> cd /local/mnt/workspace/qrlSdkSrc/sample
> source /local/mnt/workspace/qrlSdkDst/environment-setup-<target>
> make

WARNING: See Shell Limitations

Push the sample app to the target and run it:

> adb push hello /home/linaro
<xyz> KB/s (<abc> bytes in <p.q>s)
> adb shell /home/linaro/hello
Hello world!

More information on environment setup

The environment setup sets environment variables like CC, CFLAGS, LDFLAGS, so you can source this file, then use a Makefile for the build. The environment variables provide the variables $CC, $CFLAGS, etc., to the Makefile, making it simple to compile/link your code. The environment setup also includes passing --sysroot=xxx to the gcc so the include file and libraries used on the target can be linked with your code.

Shell limitation

Sourcing the SDK's environment setup script renders the user's shell unusable for normal operations other than cross-compilation for the Snapdragon Flight™ apps processor applications. For instance, the adb may not work. It is suggested that users open another shell to do other operations.

SDK capabilities and limitations

The following types of applications were tested and are supported by this SDK:

The SDK does NOT support building of the following software. They need to be built on target.