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--- In , "lpcarmed" <lpcarmed@g...> wrote: > > I had issues with 115K until I replaced the Xtal with a 14.7456MHz > one. Also, the lpc21isp.c from Martin Maurer is much more reliable. > Big plus using it you can customize, even to the extent of > automatically updating the bootlodaer if you wish. Hi - can you email me a copy...I'd like to take a look. Thanks Jane. > > --- In , Robert Adsett <subscriptions@a...> wrote: > > At 07:15 PM 1/8/05 +0000, you wrote: > > >I'll take a look next week on the actual data quality being received > > >transmitted at the CPU. I agree with you, from the table in the user > > >manual for the LPC2106 you can run at 115200 at 12.288 MHz, so at > > >12MHz even though we'll probably have a small percentage error per > > >bit, we should still be OK. > > > > I think one of us is reading the wrong line. I see 12.288 MHz > topping out > > at 38400. > > > > What is missing is a description of what is limiting the match so > that it > > could be determined for the actual crystal used. I expect it's a > divisor > > issue. > > > > If we knew what it was it should be straightforward to figure out which > > baudrates will match (and maybe even switch crystals to meet > multiple neeeds). > > > > Robert > > > > > > " 'Freedom' has no meaning of itself. There are always restrictions, > > be they legal, genetic, or physical. If you don't believe me, try to > > chew a radio signal. " > > > > Kelvin Throop, III |
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Philips Flash Utility V2.2.0 (max baud rate = 38400???)
Started by ●January 8, 2005
Reply by ●January 9, 20052005-01-09
Reply by ●January 9, 20052005-01-09
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janehighland wrote: > --- In , "lpcarmed" <lpcarmed@g...> wrote: >>one. Also, the lpc21isp.c from Martin Maurer is much more reliable. > Hi - can you email me a copy...I'd like to take a look. http://www.google.com/search?q=lpc21isp.c&btnI -- ------------ Alex Holden - http://www.alexholden.net/ ------------ If it doesn't work, you're not hitting it with a big enough hammer |
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Reply by ●January 9, 20052005-01-09
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Thanks - I'll give it a go. Best Regards Jan --- Alex Holden <> wrote: --------------------------------- janehighland wrote: > --- In , "lpcarmed" <lpcarmed@g...> wrote: >>one. Also, the lpc21isp.c from Martin Maurer is much more reliable. > Hi - can you email me a copy...I'd like to take a look. http://www.google.com/search?q=lpc21isp.c&btnI -- ------------ Alex Holden - http://www.alexholden.net/ ------------ If it doesn't work, you're not hitting it with a big enough hammer --------------------------------- Yahoo! Groups Links To ___________________________________________________________ ALL-NEW Yahoo! Messenger - all new features - even more fun! http://uk.messenger.yahoo.com |
Reply by ●January 9, 20052005-01-09
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At 08:46 AM 1/9/05 +0000, you wrote: >I've had the UARTs on the LPC21xx LPC22xx running fine at 115.2k (e.g. >receiving large files with 32 bit CRCs). It just that the divisor >arrangement means the baud rate @ 12MHz is approx 1% out (with the PLL >multiplying the XTAL by 5 to 60MHz / VPBDIV = 1). I just wondered >whether the bootloader on the chip gives up if it can't get an exact >baud rate... Remember the ISP program on chip doesn't use the PLL (at least there is no indication that it does) so a 1% mismatch at the (pll'd) 60MHz could be a 5% mismatch at 12MHz native clock. You can see the problem. Robert " 'Freedom' has no meaning of itself. There are always restrictions, be they legal, genetic, or physical. If you don't believe me, try to chew a radio signal. " Kelvin Throop, III |
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Reply by ●January 9, 20052005-01-09
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--- Robert Adsett <> wrote: --------------------------------- At 08:46 AM 1/9/05 +0000, you wrote: >I've had the UARTs on the LPC21xx LPC22xx running fine at 115.2k (e.g. >receiving large files with 32 bit CRCs). It just that the divisor >arrangement means the baud rate @ 12MHz is approx 1% out (with the PLL >multiplying the XTAL by 5 to 60MHz / VPBDIV = 1). I just wondered >whether the bootloader on the chip gives up if it can't get an exact >baud rate... Remember the ISP program on chip doesn't use the PLL (at least there is no indication that it does) so a 1% mismatch at the (pll'd) 60MHz could be a 5% mismatch at 12MHz native clock. You can see the problem. Yes I see the problem. I'll have a chat with Philips. Jane Robert " 'Freedom' has no meaning of itself. There are always restrictions, be they legal, genetic, or physical. If you don't believe me, try to chew a radio signal. " Kelvin Throop, III --------------------------------- Yahoo! Groups Links To ___________________________________________________________ ALL-NEW Yahoo! Messenger - all new features - even more fun! http://uk.messenger.yahoo.com |
