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Richard Erlacher
03/13/10 19:47
Read: 85 times
Denver, Co
USA


 		 #174122 - where is your head wedged?
Responding to: Per Westermark's previous message
Per Westermark said:
Richard Erlacher said:
USB is of little use because it can't support a fixed-rate data transfer ... even a slow one, without HUGE (2-4 GB) buffer memory on the peripheral side.

Not really true.

And for simplicity - just fill the FIFO of a UART and keep it running.
Or switch to FW for higher bandwidth.

A UART won't help with synchronous data.

Now ... how would that 12 Mbit burst help with 128 MBytes of data in a single synchronous burst at ~45 Mbps? Where would you get the FIFO? Are you assuming a PC is doing the work?

The trick is to figure out the best way to take advantage of the existing tools, instead of blaming them for not being identital to the tools you had access to 20 years ago.


What I blame them for is the tremendous waste of time and effort because these purportedly idiot-proof devices seldom work as claimed. Just look at the proportion of USB-to-serial and USB-to-parallel interfaces that fall flat when expected to work as the devices they replaced did.

Yes ... I know ... "modern" printers use USB. However, if you have to print a large document, you'll wear out three of them in just that one document, not to mention running out of ink a dozen times per day. They're actually a prime example. The newer ink-spitters cost about $85 dollars, but use $1k of ink per year. Back when things were sane, they cost $1k, but used $50 worth of ink/toner per year. I've had not even one of the "modern" printers survive its first year. That's why they only give you a 90-day warranty.

RE



List of 83 messages in thread
TopicAuthorDate
ready made board with 2 UARTs equipped ..      Erik Malund      01/27/10 09:00      
   Send me details      Joseph Hebert      01/27/10 19:27      
   SiLabs kit      Andy Neil      01/28/10 01:33      
      they don't, but      Erik Malund      01/28/10 04:50      
   Can you give more details ?      Kiran V. Sutar      01/28/10 04:17      
      if it was to be made, I need no assistance since ...      Erik Malund      01/28/10 04:46      
         ...and I thought Price was the issue...      Kiran V. Sutar      01/29/10 09:50      
   One Suggestion      Mahesh Joshi      02/03/10 08:05      
      the MX chips are being phased out      Erik Malund      02/03/10 08:27      
   I sent you email      Grant Beattie      02/03/10 15:46      
      read, answered, thanks      Erik Malund      02/03/10 18:25      
   you can use sm5964      Michael Ma      02/11/10 01:18      
      the idea was stated as...      Erik Malund      02/12/10 07:57      
         It is a suggestion      Michael Ma      02/27/10 22:09      
            Not a good idea      Andy Neil      02/28/10 01:11      
            that it is      Erik Malund      02/28/10 08:09      
   How about Phycore?      AP Charles      02/12/10 08:39      
      Legacy Product      Andy Neil      02/12/10 09:08      
         oh, yes      Erik Malund      02/12/10 09:42      
            Have a look at grifo      AP Charles      02/12/10 09:57      
   This looks good too      AP Charles      02/12/10 08:49      
   I've been wondering ...      Richard Erlacher      02/28/10 01:16      
      Likewise      Andy Neil      02/28/10 02:34      
         Maybe, but who makes 'em?      Richard Erlacher      02/28/10 09:38      
            8052 with only 1 UART      Andy Neil      02/28/10 11:15      
               I'm surprised, but that's the case!      Richard Erlacher      03/01/10 01:08      
                  why surprised?      Erik Malund      03/01/10 07:35      
                     That's what I thought      Andy Neil      03/01/10 07:49      
                     I never thought of it in those terms ...      Richard Erlacher      03/01/10 08:20      
                        comments      Erik Malund      03/01/10 08:47      
                           It could be done with two wires and 2-UART MCU      Richard Erlacher      03/01/10 12:41      
      120 devboards ...      Erik Malund      02/28/10 07:05      
         How difficult or costly would it be to add one?      Richard Erlacher      02/28/10 09:40      
            neither difficult nor costly      Erik Malund      02/28/10 18:31      
         SILABs 040 has 2 uarts on it      Marshall Brown      03/15/10 19:58      
   with ds89c450 or 430      JecksonS Ben      02/28/10 20:06      
      But that's a chip - not a board!      Andy Neil      03/01/10 01:50      
         cheap boards      JecksonS Ben      03/01/10 19:49      
            this is what's meant      Richard Erlacher      03/01/10 23:40      
               No RS485      Andy Neil      03/02/10 02:26      
                  Example      Andy Neil      03/02/10 03:35      
                     bad example      Jan Waclawek      03/02/10 04:02      
                        No - excellent example!      Andy Neil      03/02/10 05:29      
                           likewise with that other board ...      Richard Erlacher      03/02/10 10:01      
                           And did *you* know what are you looking for?      Jan Waclawek      03/02/10 13:30      
                              You got it      Andy Neil      03/02/10 14:34      
                  why "never"?      Jan Waclawek      03/02/10 03:58      
                     the PC's not the best example ...      Richard Erlacher      03/02/10 10:17      
                        PC as an example      Jan Waclawek      03/02/10 13:21      
                           Lots of toys ... little of any practical use.      Richard Erlacher      03/02/10 17:59      
                              Different tools can be used in different ways      Per Westermark      03/12/10 13:11      
                                 where is your head wedged?      Richard Erlacher      03/13/10 19:47      
                                    Don't blame the PC for solving wrong things with USB      Per Westermark      03/13/10 20:31      
                                       There are many things for which USB is unsuited      Richard Erlacher      03/14/10 19:32      
                                          Every change since 1980 isn't for the worse        Per Westermark      03/14/10 23:02      
                                             Maybe, but this one is      Richard Erlacher      03/15/10 12:00      
                                                again      Andy Peters      03/15/10 13:02      
                                                   Thta's what you say ...      Richard Erlacher      03/16/10 02:56      
                                                      that's what you always say      Andy Peters      03/16/10 12:04      
                                                         Where you sit determines what you see      Richard Erlacher      03/17/10 12:02      
                                                            Where did you sit?      Per Westermark      03/17/10 12:37      
                                                   SPI solves completely different problem than HDLC      Per Westermark      03/18/10 08:50      
                                                and again      Stefan KAnev      03/15/10 13:37      
                                                   what about the required size of the driver?      Richard Erlacher      03/16/10 02:48      
                                                      required size of driver      Stefan KAnev      03/16/10 07:32      
                                                         What do you mean by PCL Cost?      Richard Erlacher      03/17/10 12:04      
                                                            price difference between similar printers -      Stefan KAnev      03/17/10 13:16      
                                                Define narrow view - I see oportunities, i.e. the reverse      Per Westermark      03/15/10 13:42      
                                                   not relevant      Richard Erlacher      03/16/10 02:59      
                                                      So the Windows driver didn't list 8051 compatibility???      Per Westermark      03/16/10 03:47      
                                          I vote Richard as president for ...      Erik Malund      03/15/10 13:20      
                                             That's what one would expect from you, Erik      Richard Erlacher      03/16/10 03:00      
                              USB and fixed-rate transfer      Andy Peters      03/15/10 12:50      
                                 Fortunately, there's DOS ...      Richard Erlacher      03/16/10 03:07      
                        Linux - I thought as much      Andy Neil      03/03/10 01:07      
                        PCs        Andy Peters      03/15/10 12:48      
                           you forgot about LINUX      Richard Erlacher      03/16/10 03:20      
   By this time, anybody could have built one...      Kiran V. Sutar      03/02/10 03:11      
      Funnily enough, ...      Andy Neil      03/02/10 03:33      
      no      Erik Malund      03/02/10 08:06      
   I Hate to ask this....      Justin Fontes      03/13/10 01:44      
      A *very* common requirement!      Andy Neil      03/13/10 02:05      
      if indeed      Erik Malund      03/13/10 07:08      

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