PMP Audio Driver Design And Realization

In Recent years, the embedded system develops with the people's requirement. the intelligence equipment taking that soft hardware is composed of as notable characteristic , taking that the consumption electron product as leading factor reaches hitherto, development with the speed that extra people imagines.With computer technology, the electron technology, communication technology swiftness develops, audio handles technology getting extensive use also in a lot of fields. For example mobile telephone, IP telephone in communication field, MP3 in consume electron product and control system in the field voice recognition, sound control system.As an important component, embedded audio system takes seriously recognition. The broadcast, feasible sound recording function let the hand instrument entertainment becomes possible, driving the development of the moving-hand instruments.In the article, specifically for ARM processor digital signal processing and powerful ability and the interface characteristic of combining audio untying code chip WM9712L, we has set forth the interface design and software programming, has provided effective and pragmatic audio selling system scheme at reduced prices.In the main body of the article, the author has commented the realization specifically for platform of specially chip of company during the period of the dissertation on practice job basis developing a project in company's PMP. The first chapter have introduced the background of the article and the current situation of the PMP at home and abroad. Second chapters have introduced Windows CE OS platform design objective, the Windows CE environment developing way, and Windows CE building and testing way. Composing introduce of the hardware platform developing board in third chapters. Fourth chapters are the thesis priority, audio agreement, stream driver interface loading , driver delamination structure having introduced first, proceed to have introduced that the realization of read-write WM9712L register function, volume control and earphone/ trumpet changes ,single/stereo sound changes, broadcasting and recording thread realization and optimization. Fifth chapters sum up for the main body of the article with the improving further.