On Nov 22, 2007 7:27 PM, Andrew Lunn <[EMAIL PROTECTED]> wrote: > On Thu, Nov 22, 2007 at 05:42:11PM +0100, Tom Deconinck wrote: > > Hello, > > > > Does anyone know if there exists a driver for the AT91 TWI peripheral? > > It's Atmels implementation of I?C and it's used on the AT91SAM7S > > family (and derivatives). > > I would create a driver that fits in the eCos I?C driver (master > > only), but I wanted to check to make sure nothing alike already > > exists. > > I've been involved in a none eCos project which used an AT91SAM7S and > the TWI port. This turned out to be more difficult than expected. If > you don't feed it data fast enough it stops the transfer mid message > with an abort of something. Also, there is no DMA for this device. So > you need to make sure your other interrupt handlers are fast or you > run into problems. > > Andrew >
Thanks for the heads up. I had noticed there are no DMA channels to the TWI controller, but didn't think it would be much of an issue. I'll give it a try and see where it takes me. I need I2C anyway, so using the eCos framework makes some sense. Tom -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
