On Wed, 2007-02-07 at 13:23 -0800, Brad Beveridge wrote: > Hello, I hope that this is the correct place to post. It is :) > > I have a few questions about the Also SoC development. > I am trying to write a driver for ASoC that will connect an S3C2410 > cpu to an AK4550 codec via an I2S bus. > The AK4550 codec appears to be completely unconfigurable, with no > onboard registers (if I am wrong on this, please let me know. All the > data sheets I have show no registers, which I find 'interesting'). I'm sorry, I can't really help with the AK4550 as I don't know anything about it. > All that should be required to get output from the codec is to power > the module and send audio data via the I2S bus. To this end I've > started with the ./s3c24xx/smdk2440.c file and ripped all the I2C > control stuff out, and added code that powers the module via > machine-specific GPIOs. Fwiw, the S3C24xx code works well. You may want to configure it as I2S master and see what happens when you apply power to the codec. > On the codec side I've started with the AK4535, and pulled out almost > everything interesting. The AK4550 has two input pins which control a > de-emphasis filter for when the codec does ADC conversions, but I > don't really know what to do with them. > I would suggest contacting AKM for information on the input pins. > On to the questions: > 1) Is the AK4550 codec really without registers like I think it is? > 2) What is the best way to hook up the de-emphasis pins and expose > them? I feel like I need generic functions in the codec to control > them, and those generics should somehow hook to machine-specific > functions. I don't know how to do this. > 3) Am I basically on the right track here? Please check 1,2 and 3 with AKM. > 4) Does ASoC have a canonical repository that I should be pulling the > latest code from? It soon will. We are about a week or 2 away from hosting our git tree. Snapshots are here atm :- http://opensource.wolfsonmicro.com/~lg/asoc/ > 5) Does ASoC have its own mailing list/IRC channel? Mailing list is here (i.e. this list), although I'm not aware of any development IRC channel for alsa - this would probably be a good thing to have..... Liam ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
