Lpc2000

Considering how we're dealing with flash sizes up to 512KB now, and 
loading that much data at 38.4kbps is significantly slower than 
230kbps, are there any plans to fix this problem?

Or better yet, consdering the speed, are there any plans to create a 
USB-based bootloader?  Doesn't the SAM7S have this already?

Additionally since there are some chips (FTDI comes to mind) that 
allow a WIDE range of baud rates, is it possible to use the current 
bootloader with a nonstandard baud rate?  I.e. 12MHz can generate 
187.5kbps with the same settings that 14.5796MHz uses to generate 
230kbps.  I know the FTDI chip can handle 187.5kbps.

-- Sean

--- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@y...> 
wrote:
>
> Hi Martin,
> 
> there are no immediate plans to use the fractional baudrate 
> generator because we try to keep the number of different 
bootloaders 
> limited. Also it is very difficult to use the fractional BR 
> generator if the frequency of the oscillator is not known.
> Last but not least it is not possible to go 921 kbaud with 12 MHz 
> because the max serial frequency with or without fractional 
baudrate 
> generator is CPU clock divided by 16 and the bootloader does not 
> change the PLL settings.
> 
> Regards, Robert
> 
> --- In lpc2000@yahoogroups.com, "Martin Maurer" 
<mailingliste@c...> 
> wrote:
> >
> > Hi Robert,
> > 
> > is there any plan to use the fractional baudrate generation in 
the 
> booter,
> > so you can boot e.g. even at 921 kbit/s with a 12 MHz 
oscillator ?
> > Theoretically it should be possible, hardware is supporting it...
> > 
> > Regards,
> > 
> >          Martin
> > 
> > ----- Original Message ----- 
> > From: "philips_apps" <philips_apps@y...>
> > To: <lpc2000@yahoogroups.com>
> > Sent: Friday, November 18, 2005 12:12 AM
> > Subject: [lpc2000] Re: LPC214x crystal frequencies // ISP max 
> baudrate 38.4 
> > kBaud using 12 MHz
> > 
> > 
> > > Confirmed
> > >
> > > 12 MHz  ->  max baudrate 38400
> > > 16 MHz  ->  max baudrate 19200
> > > 24 MHz  ->  max baudrate 38400
> > >
> > > Robert
> > >
> > > --- In lpc2000@yahoogroups.com, "seangra" <sgraham@o...> wrote:
> > >>
> > >> Based on my calculations, 16MHz can only get to 19,200 (7% 
error
> > > at
> > >> 38,400) and 24MHz can get 38,400.  If you went up to 48MHz 
> crystal
> > >> you could get 57,600.
> > >>
> > >> -- Sean
> > >>
> > >> --- In lpc2000@yahoogroups.com, "philips_apps" 
> <philips_apps@y...>
> > >> wrote:
> > >> >
> > >> > All,
> > >> >
> > >> > based on the algorithm the bootloader uses to determine the
> > >> > baudrate, as Joel already found out, it is correct that the 
> max
> > >> > baudrate for 12 MHz is 38400 Baud.
> > >> >
> > >> > Will do some additional tests to determine the baudrates 
for 
> 16
> > >> MHz
> > >> > and 24 MHz but we assume that 12 MHz will be the most used
> > > crystal
> > >> > as it provides functionality for USB and enables the 60 MHz 
> max.
> > >> CPU
> > >> > speed as well.
> > >> >
> > >> > Sorry for not providing the appropriate values in the table 
> for
> > >> the
> > >> > ISP, will update with the next reloease of the Users Manual 
> but
> > >> that
> > >> > might still take a little while.
> > >> >
> > >> > Robert
> > >> >
> > >> > --- In lpc2000@yahoogroups.com, "Joel Winarske" <joelw@i...>
> > > wrote:
> > >> > >
> > >> > > > To get the 48 MHz necessary for the LPC214x USB, you 
must
> > > use
> > >> a
> > >> > crystal
> > >> > > > of 12.0 MHz, 16.0 MHz, or 24.0 MHz.  None of these
> > > frequencies
> > >> > are
> > >> > > > mentioned in the manual table 291 that lists the 
possible
> > > ISP
> > >> > baud
> > >> > > > rates with various crystal frequencies.  Can you use 
> serial
> > >> ISP
> > >> > with
> > >> > > > 12/16/24 MHz, and with which baud rates?
> > >> > >
> > >> > > At 12MHz the highest the Phillips Flash utility will 
connect
> > > is
> > >> > 38.4k baud.
> > >> > > I cannot connect running a higher baud.
> > >> > >
> > >> > > Joel
> > >> > >
> > >> >
> > >>
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
>