T1CMPR and CMPR1
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From: Jerry Avins on 16 Apr 2010 23:06 On 4/16/2010 3:53 PM, Rune Allnor wrote: > On 16 apr, 21:14, Rune Allnor<all...(a)tele.ntnu.no> wrote: > >> That one was for real. 'Den Gode Nabo' is the best pub in town. > > Some images from the pub: > > http://www.dengodenabo.com/index.php?p=35-35-32 > > Probably one of the best beer selections in town; certainly one > of the most fascinating jukeboxes: I have spent more than a few > dozen hours contemplating the bubbles flowing in the frame of > that jukebox... not a single straight angle in the building. > > But the food is good! Ridiculously good. I love that Wurlitzer at the back! I used to repair them. Jerry -- "It does me no injury for my neighbor to say there are 20 gods, or no God. It neither picks my pocket nor breaks my leg." Thomas Jefferson to the Virginia House of Delegates in 1776. ���������������������������������������������������������������������
From: Rune Allnor on 17 Apr 2010 05:47 On 17 apr, 05:06, Jerry Avins <j...(a)ieee.org> wrote: > On 4/16/2010 3:53 PM, Rune Allnor wrote: > > > On 16 apr, 21:14, Rune Allnor<all...(a)tele.ntnu.no> wrote: > > >> That one was for real. 'Den Gode Nabo' is the best pub in town. > > > Some images from the pub: > > >http://www.dengodenabo.com/index.php?p=35-35-32 > > > Probably one of the best beer selections in town; certainly one > > of the most fascinating jukeboxes: I have spent more than a few > > dozen hours contemplating the bubbles flowing in the frame of > > that jukebox... not a single straight angle in the building. > > > But the food is good! Ridiculously good. > > I love that Wurlitzer at the back! I used to repair them. Don't remember off the top of my head if that's a Wurlitzer, but the jukebox is one of the most fascinating objects in a room stuffed with fascinating objects. ( Lots of craftsmen's tools from ages long since passed - the place reminds me of the barn on my grandfather's farm, where he used to collect all kinds of tools. Except for the beer. And the crowd. ) There are two glass tubes, one on each side of the front, that are filled with water and where air bubbles rise thrugh the water for decorative effect. These pipes are curved the same way the front panel, as an arc across the top of the front panel (the exact top of the pipe is covered, so there presumably are some valves inside that remove the air from the pipe at that point). The funny part is the way these rising air bubbles behave inside the pipe. Some times bubbles 'overtake' bubbles higher up in the pipe, which presumably is governed by relative sizes of bubbles and the amount of water between them. At the top arch it seems the bubbles accelerate significantly. I never really understood if they do that for real, or if it is an optical effect caused by the bubbles moving sideways as well as upwards. Let's just say that commenting on those bubbles was a certain ice-breaker, if one ran out of conversation topics. As long as one was in the company of fellow engineers, that is. Rune
From: Codefragment on 17 Apr 2010 10:16
>Codefragment wrote: >>> Codefragment wrote: >>>> Can someone tell me the difference between these two? My guess is that >>>> T1CMPR initializes the compare value while CMPR1 allows you to change >> the >>>> value. >>> The _only_ reason that I know that you're talking about some variation >>> of the Texas Instruments event manager peripheral is because I happen to >>> have worked with it -- and I could be wrong. >>> >>> _Always_ tell what processor you're using. It may be the only processor >>> in the world to you, but it isn't the only processor in the world. >>> >>> Just because the processor says it's a "DSP" doesn't mean you're _doing_ >>> DSP -- in this case you're not; you're doing plain ol' embedded code >>> writing, and comp.arch.embedded would be a better place to post. >>> >>> _If_ you're talking about the TMS320F2812, or a substantially similar >>> processor, then T1CMPR and CMPR1 control two entirely different sets of >>> pins -- T1CMPR controls a simple PWM, while CMPR1 controls 1/3 of a >>> three-phase motor control peripheral, which happens to drive not one, >>> but _two_ pins, as well as doing a whole bunch of other interesting >> stuff. >>> -- >>> Tim Wescott >>> Control system and signal processing consulting >>> www.wescottdesign.com >>> >> >> Sorry, you are correct I am using the TMS320F2812. I was provided code for >> a lab in school and they use the cmpr1 and T1CMPR. The board is connected >> to an H-Bridge to drive a small dc motor. If I understand you correctly, >> which I may not, the T1CMPR is the only thing I should be using for this >> application. Thank you for your help!! > >That depends on which pins connect -- read the pile of manuals, and >chase down which segments of the Event Manager talk to the pins that >drive the H bridge. > >You can probably limit yourself to the Event Manager manual and the >processor's Data Manual (I think that's what they call the extended data >sheet). The Event Manager will tell you the names of the pin(s) you >need to look at, while the processor's data manual will tell you where >those pins go on your particular chip. > >-- >Tim Wescott >Control system and signal processing consulting >www.wescottdesign.com > Thanks for the help!! I understand what was confusing me! |