From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: Improve the accuracy of the baud rate generator by using round-to-closest instead of truncating when calculating baud rate divisors. From: Johan Hovold Message-Id: <20181115124625.GI19900@localhost> Date: Thu, 15 Nov 2018 13:46:25 +0100 To: Nikolaj Fogh Cc: Johan Hovold , nfogh@vectory.com, linux-usb@vger.kernel.org List-ID: T24gVGh1LCBOb3YgMTUsIDIwMTggYXQgMDk6MjQ6NDlBTSArMDEwMCwgSm9oYW4gSG92b2xkIHdy b3RlOgo+IE9uIFR1ZSwgTm92IDEzLCAyMDE4IGF0IDA4OjE5OjQ0UE0gKzAxMDAsIE5pa29sYWog Rm9naCB3cm90ZToKPiA+IE9uIDExLzEyLzE4IDEwOjU0IEFNLCBKb2hhbiBIb3ZvbGQgd3JvdGU6 Cj4gPiA+IE9uIFdlZCwgT2N0IDMxLCAyMDE4IGF0IDA5OjE2OjQ4UE0gKzAxMDAsIE5pa29sYWog Rm9naCB3cm90ZToKPiA+ID4+IEkgaGF2ZSBleHBlcmllbmNlZCB0aGF0IHRoZSBmdGRpX3NpbyBk cml2ZXIgZ2l2ZXMgbGVzcy10aGFuLW9wdGltYWwKPiA+ID4+IGJhdWQgcmF0ZXMgYXMgdGhlIGRy aXZlciB0cnVuY2F0ZXMgaW5zdGVhZCBvZiByb3VuZHMgdG8gbmVhcmVzdAo+ID4gPj4gZHVyaW5n IGJhdWQgcmF0ZSBkaXZpc29yIGNhbGN1bGF0aW9uLgo+IAo+ID4gPj4gVGhpcyBwYXRjaCBpbXBy b3ZlcyBvbiB0aGUgYmF1ZCByYXRlIGdlbmVyYXRpb24uIFRoZSBnZW5lcmF0ZWQgYmF1ZAo+ID4g Pj4gcmF0ZSBjb3JyZXNwb25kcyB0byB0aGUgb3B0aW1hbCBiYXVkIHJhdGUgYWNoaWV2YWJsZSB3 aXRoIHRoZSBjaGlwLgo+ID4gPj4gVGhpcyBpcyB3aGF0IHRoZSB3aW5kb3dzIGRyaXZlciBnaXZl cyBhcyB3ZWxsLgo+ID4gPgo+ID4gPiBIb3cgZGlkIHlvdSB2ZXJpZnkgdGhpcz8gRGlkIHlvdSB0 cmFjZSBhbmQgY29tcGFyZSB0aGUgZGl2aXNvcnMKPiA+ID4gYWN0dWFsbHkgcmVxdWVzdGVkIGJ5 IHRoZSBXaW5kb3dzIGRyaXZlciwgb3IgZGlkIHlvdSBtZWFzdXJlIHRoZQo+ID4gPiByZXN1bHRp bmcgcmF0ZXMgdXNpbmcgYSBzY29wZT8KPiAKPiA+IEkgdmVyaWZpZWQgaXQgYnkgc2NvcGUuIEdy YW50ZWQsIEkgb25seSB2ZXJpZmllZCBpdCBmb3Igb25lIGJhdWQgcmF0ZQo+ID4gKDk2MTIwMCku IFdoZXRoZXIgaXQgZ2l2ZXMgdGhlIHNhbWUgYXMgdGhlIFdpbmRvd3MgZHJpdmVyIGluIGdlbmVy YWwsCj4gPiBJJ20gbm90IHN1cmUuIEhvd2V2ZXIsIEkgd291bGQgdGhpbmsgdGhhdCByb3VuZGlu ZyBpbnN0ZWFkIG9mIGZsb29yaW5nCj4gPiB3b3VsZCBhbHdheXMgeWllbGQgdGhlIG1vc3QgYWNj dXJhdGUgcmVzdWx0Lgo+IAo+IEknbSBub3Qgc28gc3VyZSBpbiB0aGlzIGNhc2UuIFRoZSBkcml2 ZXIgdXNlcyAic3ViLWludGVnZXIiIGRpdmlzb3JzIGFuZAo+IGxvb2tzIGxpa2UgaXQgZGVwZW5k cyBvbiB0cnVuY2F0aW9uIHJhdGhlciB0aGFuIHJvdW5kaW5nLiBTb21lCj4gYmFja2dyb3VuZCBo ZXJlOgo+IAo+IAlodHRwczovL3d3dy5mdGRpY2hpcC5jb20vU3VwcG9ydC9Lbm93bGVkZ2ViYXNl L2luZGV4Lmh0bWw/d2hhdGJhdWRyYXRlc2FyZWFjaGlldmVhYmwuaHRtCgpBZnRlciB0YWtpbmcg YSBjbG9zZXIgbG9vayBhdCB0aGUgZHJpdmVyLCBJIHRoaW5rIHlvdXIgcGF0Y2ggbWF5IGJlCmZp bmUuIEl0IHNob3VsZG4ndCBjaGFuZ2UgOTIxNjAwIGJhdWQsIHRob3VnaCwgYnV0IEkgc2VlIG5v dyB0aGF0IHlvdQp3cm90ZSAqOTYxMjAwKiBhYm92ZS4gV2FzIHRoYXQgaW50ZW50aW9uYWw/Cgo+ IElmIHlvdSB3YW50IHRvIGNoYW5nZSB0aGVzZSBjYWxjdWxhdGlvbnMgeW91IG5lZWQgdG8gbWFr ZSBhIHN0cm9uZ2VyCj4gY2FzZSBmb3IgaXQgYW5kIHZlcmlmeSB0aGF0IHdlIGRvbid0IG1lc3Mg dXAgc29tZSBvdGhlciByYXRlCj4gaW5hZHZlcnRlbnRseS4KClRoaXMgc3RpbGwgc3RhbmRzIHRo b3VnaCwgeW91IG5lZWQgYSBiZXR0ZXIgZGVzY3JpcHRpb24gb2Ygd2h5IHRoaXMKaXMgbmVlZGVk IGFuZCBjb3JyZWN0LiBNZW50aW9uIHdoaWNoIGRldmljZSBhbmQgcmF0ZSB0aGF0IHdhcyBvZmYs IGFuZApieSBob3cgbXVjaC4gRGV0ZXJtaW5pbmcgdGhlIHRoZW9yZXRpY2FsIGRpZmZlcmVuY2Ug bWF5IGJlIGludGVyZXN0aW5nCnRvbywgd2hpbGUgbWFraW5nIHN1cmUgd2UgZG9uJ3QgaW50cm9k dWNlIGxhcmdlciBlcnJvcnMgZm9yIG90aGVyIHJhdGVzLgoKVGhhbmtzLApKb2hhbgo=