BCM2835 PWM audio driver - week 9

[Pedro Coutin]

Hello everyone,

I implemented a ring buffer with cyclic DMA and audio now works fine.

I just copypasted dmastart() in dma.c to make dmaloop(), removed the

interrupt setting and made the next control block the initial control

block instead of nil so it keeps looping. This should be cleaned up

somehow...

Then, instead of dmawait() in audioclose(), the DMA device is polled

until it gets to the last written sample, then DMA and PWM is shut down.

There is no volume file yet. After that, I guess I'll start messing with

the videocore...

[Steven Stallion]

Awesome work Pedro, keep it up!

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