Lpc2000

Hi tonalbuilder2002
FTDI solutions is good, but I have a problem with
FTDI232 chip. 
I have DLP-USB232M dlnda solution (sample board) and I
don't result problem with the chiPs (RTS, DTR is
negative, this is no the problem) and problem is I
don't can trasnsfer byte to board. but I received byte
correctly.
FTDI RS232 solution is not easy. I work with GNU and
Linux slackwaere, system finded FTDI chip correctly.
For more informations about my board and my FTDI
solutions look http://geocities.com/kralikbo
btw: yesterday party is over, best, is'nt it ?
bttw: I don't read message completly ;-)

--- tonalbuilder2002 <twentiethwave@...>
wrote:

> > Eek.  Very expensive.
> 
> Indeed, it would seem the FTDI chip solution is
> still the best 
> solution for product runs of up to several hundred
> total units, or 
> where time-to-market is critical.
> 
> You can buy a lot of FTDI chips and the attendant
> board space for 
> the cost of one of those development systems.  And
> the PC and 
> peripheral side drivers are (or can be) reduced to
> nothing more 
> complicated than the serial protocols we came to
> understand in
> simpler times.
> 
> Even without the convenience of end points, the FTDI
> "direct" D2XX 
> drivers are capable of sustaining many hundreds of
> kilobytes/second.  
> The trick is, at the peripheral side let those FTDI
> internal buffers 
> fill up a bit before reading a block of data, and
> don't get bogged 
> down in interrupt-per-character data handling.
> Enable the USB 
> interrupt.  When the first USB interrupt hits,
> disable the USB 
> interrupt and set up a timer interrupt to occur tens
> or hundreds of 
> microseconds later when the buffer is nearly full. 
> When the timer 
> hits, soak up the buffer all at once, and re-enable
> the USB 
> interrupt.  It helps speed things along if you
> arrange the pins so 
> the FTDI handshake pin states appear in the same
> data word as the 
> byte data.
> 
> At the PC end, attach the D2XX driver handshake to a
> thread that 
> maintains buffers filled and emptied by your Windows
> application 
> code.  FTDI has good docs on the drivers and some PC
> example code.  
> On a gHz+ machine XP often services such threads at
> over 1mHz!
> 
> Or you can just use the serial port driver, which is
> not quite as 
> fast as the D2XX driver, but in every other way a
> piece of cake!
> 
> Bill T.
> http://www.kupercontrols.com
> 
> 
> 
> 


Regards / S pozdravom Boris Kralik

http://www.geocities.com/kralikbo/
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