How to build a good HAL

[ianhom]

I have build the main part of scheduler, and it works well, new I need to build useful HAL now. Would anybody want to share ideas about a userful friendly HAL ?

[ianhom]

Two methods:

1. Resgister drivers into MOE HAL, HAL provides APIs to application tasks
2. Application tasks can get drivers directly by interfaces.
   Both mehods may be adopted