From mboxrd@z Thu Jan 1 00:00:00 1970 From: Julian Cable Subject: fine sample rate control for RME hdsp 9632 Date: Thu, 8 Mar 2007 12:33:56 -0800 (PST) Message-ID: <557316.48905.qm@web35603.mail.mud.yahoo.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="0-595376096-1173386036=:48905" Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@lists.sourceforge.net Errors-To: alsa-devel-bounces@lists.sourceforge.net To: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org --0-595376096-1173386036=:48905 Content-Type: multipart/alternative; boundary="0-1041839256-1173386036=:48905" --0-1041839256-1173386036=:48905 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hi,=0A=0A I've added a control to the hdsp driver to control the dds regis= ter on the 9632. This allows fine tuning of the sample rate as is supported= by the windows driver. The feature is implemented as an offset to the curr= ent sample rate, since most of the code assumes only discrete sample rates = are supported. So the sample rate will always be selected and indicated as = one of the standard supported sample rates but may actually be a few % high= er or lower. It seems to work very well.=0A=0AOne possible application is t= o discipline the sample rate from the system clock or a GPS receiver to pro= vide a long term accurate precise frequency source without expensive refere= nce clocks.=0A=0AThe patch is against alsa-driver-1.0.14rc3=0A=0AJulian=0A= =0A =0A=0A=0A=0A=0A=09=09=0A______________________________________________= _____________ =0AInbox full of unwanted email? Get leading protection and 1= GB storage with All New Yahoo! Mail. http://uk.docs.yahoo.com/nowyoucan.htm= l --0-1041839256-1173386036=:48905 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable

Hi,

I've added a control to the hdsp dri= ver to control the dds register on the 9632. This allows fine tuning of the= sample rate as is supported by the windows driver. The feature is implemen= ted as an offset to the current sample rate, since most of the code assumes= only discrete sample rates are supported. So the sample rate will always b= e selected and indicated as one of the standard supported sample rates but = may actually be a few % higher or lower. It seems to work very well.
One possible application is to discipline the sample rate from the system = clock or a GPS receiver to provide a long term accurate precise frequency s= ource without expensive reference clocks.

The patch is against alsa-= driver-1.0.14rc3

Julian

=0A=09=09<= hr size=3D1> =0ANow you can scan emails quickly with a reading pa= ne. Get the new Yahoo! Mail. --0-1041839256-1173386036=:48905-- --0-595376096-1173386036=:48905 Content-Type: text/x-diff; name="=?utf-8?q?hdsp.c.patch?=" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="=?utf-8?q?hdsp.c.patch?=" Mjc3YTI3OCwyODIKPiAvKiBSTUUgc2F5cyBuID0gMTA0ODU3NjAwMDAwMDAw LCBidXQgaW4gdGhlIHdpbmRvd3MgTUFESSBkcml2ZXIsIEkgc2VlOgo+IAly ZXR1cm4gMTA0ODU3NjAwMDAwMDAwIC8gcmF0ZTsgLy8gMTAwIE1Iego+IAly ZXR1cm4gMTEwMTAwNDgwMDAwMDAwIC8gcmF0ZTsgLy8gMTA1IE1Iego+ICov CSAgIAo+ICNkZWZpbmUgRERTX05VTUVSQVRPUiAxMDQ4NTc2MDAwMDAwMDBV TEw7ICAvKiAgPSAgMl4yMCAqIDEwXjggKi8KMTAwNCwxMDA4YzEwMDkKPCAJ LyogUk1FIHNheXMgbiA9IDEwNDg1NzYwMDAwMDAwMCwgYnV0IGluIHRoZSB3 aW5kb3dzIE1BREkgZHJpdmVyLCBJIHNlZToKPCAvLwlyZXR1cm4gMTA0ODU3 NjAwMDAwMDAwIC8gcmF0ZTsgLy8gMTAwIE1Iego8IAlyZXR1cm4gMTEwMTAw NDgwMDAwMDAwIC8gcmF0ZTsgLy8gMTA1IE1Iego8ICAgICAgICAgKi8JICAg CjwgCW4gPSAxMDQ4NTc2MDAwMDAwMDBVTEw7ICAvKiAgPSAgMl4yMCAqIDEw XjggKi8KLS0tCj4gCW4gPSBERFNfTlVNRVJBVE9SOwozMDg3YTMwODksMzE1 OQo+ICNkZWZpbmUgSERTUF9ERFNfT0ZGU0VUKHhuYW1lLCB4aW5kZXgpIFwK PiB7IC5pZmFjZSA9IFNORFJWX0NUTF9FTEVNX0lGQUNFX01JWEVSLCBcCj4g ICAubmFtZSA9IHhuYW1lLCBcCj4gICAuaW5kZXggPSB4aW5kZXgsIFwKPiAg IC5pbmZvID0gc25kX2hkc3BfaW5mb19kZHNfb2Zmc2V0LCBcCj4gICAuZ2V0 ID0gc25kX2hkc3BfZ2V0X2Rkc19vZmZzZXQsIFwKPiAgIC5wdXQgPSBzbmRf aGRzcF9wdXRfZGRzX29mZnNldCBcCj4gfQo+IAo+IHN0YXRpYyBpbnQgaGRz cF9kZHNfb2Zmc2V0KHN0cnVjdCBoZHNwICpoZHNwKQo+IHsKPiAJdTY0IG47 Cj4gCXUzMiByOwo+IAl1bnNpZ25lZCBpbnQgZGRzX3ZhbHVlID0gaGRzcC0+ ZGRzX3ZhbHVlOwo+IAlpbnQgc3lzdGVtX3NhbXBsZV9yYXRlID0gaGRzcC0+ c3lzdGVtX3NhbXBsZV9yYXRlOwo+IAo+IAluID0gRERTX05VTUVSQVRPUjsK PiAJLyoKPiAJICogZGRzX3ZhbHVlID0gbiAvIHJhdGUKPiAJICogcmF0ZSA9 IG4gLyBkZHNfdmFsdWUKPiAJICovCj4gCWRpdjY0XzMyKCZuLCBkZHNfdmFs dWUsICZyKTsKPiAJaWYgKHN5c3RlbV9zYW1wbGVfcmF0ZSA+PSAxMTIwMDAp Cj4gCQluICo9IDQ7Cj4gCWVsc2UgaWYgKHN5c3RlbV9zYW1wbGVfcmF0ZSA+ PSA1NjAwMCkKPiAJCW4gKj0gMjsKPiAJcmV0dXJuICgoaW50KW4pIC0gc3lz dGVtX3NhbXBsZV9yYXRlOwo+IH0KPiAKPiBzdGF0aWMgaW50IGhkc3Bfc2V0 X2Rkc19vZmZzZXQoc3RydWN0IGhkc3AgKmhkc3AsIGludCBvZmZzZXRfaHop Cj4gewo+IAlpbnQgcmF0ZSA9IGhkc3AtPnN5c3RlbV9zYW1wbGVfcmF0ZSAr IG9mZnNldF9oejsKPiAJaGRzcF9zZXRfZGRzX3ZhbHVlKGhkc3AsIHJhdGUp Owo+IAlyZXR1cm4gMDsKPiB9Cj4gCj4gc3RhdGljIGludCBzbmRfaGRzcF9p bmZvX2Rkc19vZmZzZXQoc3RydWN0IHNuZF9rY29udHJvbCAqa2NvbnRyb2ws IHN0cnVjdCBzbmRfY3RsX2VsZW1faW5mbyAqdWluZm8pCj4gewo+IAl1aW5m by0+dHlwZSA9IFNORFJWX0NUTF9FTEVNX1RZUEVfSU5URUdFUjsKPiAJdWlu Zm8tPmNvdW50ID0gMTsKPiAJdWluZm8tPnZhbHVlLmludGVnZXIubWluID0g LTUwMDA7Cj4gCXVpbmZvLT52YWx1ZS5pbnRlZ2VyLm1heCA9IDUwMDA7Cj4g CXJldHVybiAwOwo+IH0KPiAKPiBzdGF0aWMgaW50IHNuZF9oZHNwX2dldF9k ZHNfb2Zmc2V0KHN0cnVjdCBzbmRfa2NvbnRyb2wgKmtjb250cm9sLCBzdHJ1 Y3Qgc25kX2N0bF9lbGVtX3ZhbHVlICp1Y29udHJvbCkKPiB7Cj4gCXN0cnVj dCBoZHNwICpoZHNwID0gc25kX2tjb250cm9sX2NoaXAoa2NvbnRyb2wpOwo+ IAkKPiAJdWNvbnRyb2wtPnZhbHVlLmVudW1lcmF0ZWQuaXRlbVswXSA9IGhk c3BfZGRzX29mZnNldChoZHNwKTsKPiAJcmV0dXJuIDA7Cj4gfQo+IAo+IHN0 YXRpYyBpbnQgc25kX2hkc3BfcHV0X2Rkc19vZmZzZXQoc3RydWN0IHNuZF9r Y29udHJvbCAqa2NvbnRyb2wsIHN0cnVjdCBzbmRfY3RsX2VsZW1fdmFsdWUg KnVjb250cm9sKQo+IHsKPiAJc3RydWN0IGhkc3AgKmhkc3AgPSBzbmRfa2Nv bnRyb2xfY2hpcChrY29udHJvbCk7Cj4gCWludCBjaGFuZ2U7Cj4gCWludCB2 YWw7Cj4gCQo+IAlpZiAoIXNuZF9oZHNwX3VzZV9pc19leGNsdXNpdmUoaGRz cCkpCj4gCQlyZXR1cm4gLUVCVVNZOwo+IAl2YWwgPSB1Y29udHJvbC0+dmFs dWUuZW51bWVyYXRlZC5pdGVtWzBdOwo+IAlzcGluX2xvY2tfaXJxKCZoZHNw LT5sb2NrKTsKPiAJaWYgKHZhbCAhPSBoZHNwX2Rkc19vZmZzZXQoaGRzcCkp Cj4gCQljaGFuZ2UgPSAoaGRzcF9zZXRfZGRzX29mZnNldChoZHNwLCB2YWwp ID09IDApID8gMSA6IDA7Cj4gCWVsc2UKPiAJCWNoYW5nZSA9IDA7Cj4gCXNw aW5fdW5sb2NrX2lycSgmaGRzcC0+bG9jayk7Cj4gCXJldHVybiBjaGFuZ2U7 Cj4gfQo+IAozMDkyYzMxNjQsMzE2NQo8IEhEU1BfWExSX0JSRUFLT1VUX0NB QkxFKCJYTFIgQnJlYWtvdXQgQ2FibGUiLCAwKQotLS0KPiBIRFNQX1hMUl9C UkVBS09VVF9DQUJMRSgiWExSIEJyZWFrb3V0IENhYmxlIiwgMCksCj4gSERT UF9ERFNfT0ZGU0VUKCJERFMgU2FtcGxlIFJhdGUgT2Zmc2V0IChIeikiLCAw KQo= --0-595376096-1173386036=:48905 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV --0-595376096-1173386036=:48905 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Alsa-devel mailing list Alsa-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-devel --0-595376096-1173386036=:48905--