Re: Address the WM8753 directly
On Sat, 2010-11-13 at 21:03 +0100, EdorFaus wrote: > On 11/08/2010 11:47 PM, Timo Juhani Lindfors wrote: > > Ed Kapitein writes: > >> Does anyone have pointers on how to address the hardware and its > >> registers etc? > >> I want to write the program in C and need a starting point. > > > > I think you need to write kernel space code to use it since there are > > shared resources like i2c that can not be used without proper locking > > (just guessing here). > > I don't know wether or not that is true, but there is nevertheless a > good suggestion between the lines here - for a working example of how to > use this hardware, you can look at the driver in the Linux kernel. :) > Thanks, I also think it is a good suggestion, so i will use the alsa driver for now. If i have build up enough courage i might try to replace the alsa part with something of my own. So far it is great fun to get it working by trial and error! Kind regards, Ed ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Address the WM8753 directly
On 11/08/2010 11:47 PM, Timo Juhani Lindfors wrote: > Ed Kapitein writes: >> Does anyone have pointers on how to address the hardware and its >> registers etc? >> I want to write the program in C and need a starting point. > > I think you need to write kernel space code to use it since there are > shared resources like i2c that can not be used without proper locking > (just guessing here). I don't know wether or not that is true, but there is nevertheless a good suggestion between the lines here - for a working example of how to use this hardware, you can look at the driver in the Linux kernel. :) ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Address the WM8753 directly
On Thursday 11 November 2010, Ed Kapitein wrote: > On Wed, 2010-11-10 at 12:57 -0800, W. B. Kranendonk wrote: > > --- On Wed, 11/10/10, Al Johnson wrote: > > > From: Al Johnson > > > > > > > The ultimate goal is to make a FR to FR modem > > > > > > conection, using the GSM > > > > > > > voice band. > > > > > > Why? Is this just to see whether it's possible, or how bad > > > the voice channel > > > is as a data connection when compared to the data channel? > > > > I can imagine using such a solution on a flatfee subscribtion that does > > not include data traffic. Just don't tell me you want to use the > > resulting connection for VoIP :-P > > > > Boudewijn > > > > > > > > > > ___ > > Openmoko community mailing list > > community@lists.openmoko.org > > http://lists.openmoko.org/mailman/listinfo/community > > Hi all, > > Yes, i would like to see if it is possible and refresh my C programming > skills. As good a reason as any :-) > It is indeed a flat fee voice subscription, data would cost extra. > VOIP is not what i had in mind ;-) You've probably checked this, but just in case...On many subscriptions GSM data calls are treated the same as voice calls, not like GPRS or 3G data connections. It's like using an analogue or ISDN modem, circuit switched to a phone number just like a voice call, but carrying arbitrary data rather than encoded voice. > But i think i can use it to send GPS data from one FR to another. > Or use it for a commandline connection. That sounds plausible, going back to ancient bit rates. Good luck - you'll be an expert in the workings of voice codecs by the end of this! ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Address the WM8753 directly
On Wed, 2010-11-10 at 12:57 -0800, W. B. Kranendonk wrote: > --- On Wed, 11/10/10, Al Johnson wrote: > > From: Al Johnson > > > The ultimate goal is to make a FR to FR modem > > conection, using the GSM > > > voice band. > > > > Why? Is this just to see whether it's possible, or how bad > > the voice channel > > is as a data connection when compared to the data channel? > > I can imagine using such a solution on a flatfee subscribtion that does not > include data traffic. Just don't tell me you want to use the resulting > connection for VoIP :-P > > Boudewijn > > > > > ___ > Openmoko community mailing list > community@lists.openmoko.org > http://lists.openmoko.org/mailman/listinfo/community > Hi all, Yes, i would like to see if it is possible and refresh my C programming skills. It is indeed a flat fee voice subscription, data would cost extra. VOIP is not what i had in mind ;-) But i think i can use it to send GPS data from one FR to another. Or use it for a commandline connection. Kind regards, Ed ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Address the WM8753 directly
--- On Wed, 11/10/10, Al Johnson wrote: > From: Al Johnson > > The ultimate goal is to make a FR to FR modem > conection, using the GSM > > voice band. > > Why? Is this just to see whether it's possible, or how bad > the voice channel > is as a data connection when compared to the data channel? I can imagine using such a solution on a flatfee subscribtion that does not include data traffic. Just don't tell me you want to use the resulting connection for VoIP :-P Boudewijn ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Address the WM8753 directly
On Monday 08 November 2010, Ed Kapitein wrote: > Hi All, > > I want to hack a bit on the Wolfson sound chip. > The ultimate goal is to make a FR to FR modem conection, using the GSM > voice band. Why? Is this just to see whether it's possible, or how bad the voice channel is as a data connection when compared to the data channel? ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Address the WM8753 directly
Ed Kapitein writes: > Does anyone have pointers on how to address the hardware and its > registers etc? > I want to write the program in C and need a starting point. I think you need to write kernel space code to use it since there are shared resources like i2c that can not be used without proper locking (just guessing here). ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Address the WM8753 directly
Hi All, I want to hack a bit on the Wolfson sound chip. The ultimate goal is to make a FR to FR modem conection, using the GSM voice band. But the first step would be to generate a sine wave and feed it to the wolfson chip. I know i can use the alsa driver, but i would like to experiment a bit by addressing the hardware directly. Does anyone have pointers on how to address the hardware and its registers etc? I want to write the program in C and need a starting point. Example programs would be great, but all help is welcome! Kind regards, Ed ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
