The baremetal framework is designed to be portable and to support multiple / different hardware platforms. The baremetal framework contains a pair of files on each core which contain all of the platform-specific code and functionality. These files are known as audio frameworks. The baremetal framework offers several “audio frameworks”. These can be found under
src/audio_frameworks in each core's project directory tree. A single framework is used at any given time, selected via the
audio_system_config.h file described above.
These framework file pairs are responsible for managing the audio plumbing and abstract the processor and framework-specific aspects of the audio processing. When you switch audio frameworks or framework options (e.g. migrating from single core processing to dual core processing), you don’t need to change your audio processing code in the callbacks.
These frameworks are similar and each really serves as an example of how various types of audio plumbing can be done on the SHARC.
The frameworks have a very light processing footprint, usually on the order of a 3-15MHz on Core 1 (of the 450Mhz available) and less than 1 Mhz on Core 2.