70F6, can't configure RCC for use with USB

mike louaillier · ‎2017-07-18

Posted on July 18, 2017 at 23:12

Hello i'm using CUBE 4.22 and i keep getting a conflict (see jpg bellow). when i click the checkbox USB->Device (FS), the TIM1 says ''!'' and shows several conflicts. and when i click on the Clock Configuration tab, the clock screen appears and i see a dialog box that says ''do you want to run the automatic clock issues solver?''. i click ''yes'' and then it says ''cannot find solution for some constraints''.

is there a way to resolve this problem? thanx

Note: this post was migrated and contained many threaded conversations, some content may be missing.

mike louaillier · ‎2017-07-20

Posted on July 20, 2017 at 20:05

well an extra 2 seconds doesn't matter, but if the device is gonna sit in somebody's pocket and then the USB doesn't work i'm hosed. can't have the frequency drifting and now it won't connect.

Willem La Grange · ‎2017-07-20

Posted on July 20, 2017 at 22:42

It seems that you are going to connect to a smart phone or something. Here is a tip for you: Create a 'keepalive' heartbeat on the USB device side and don't forget to set your power options (Sleep, standby etc..) on your USB host device. USB connections easily goes to sleep...

mike louaillier · ‎2017-07-20

Posted on July 20, 2017 at 22:48

yes that's true but my device only plugs into the phone for about 2 minutes at a time so i don't think i need to worry about that.

john doe · ‎2017-07-20

Posted on July 21, 2017 at 04:21

This thread rocks

mike louaillier · ‎2017-07-20

Posted on July 21, 2017 at 04:51

LOL dude :)

i've pretty much concluded that the best solution is the cylindrical, through hole crystal which has long leads and uses very little board space. now the problem is i've discovered that there's a short somewhere on my board (that i spent like 50 hours making) and now the damn thing don't work. but at least i saw mostly what i needed to see so it's on to the next prototype.

john doe · ‎2017-07-20

Posted on July 21, 2017 at 05:12

But dude! The LEARNING that has gone on! We are all enriched for your having struggled. Small consolation, I know...

mike louaillier · ‎2017-07-24

Posted on July 25, 2017 at 03:57

that is a good point. thank god for the internet. now i gotta figure out the load capacitors for the crystal, but i better start a new thread for that. :)