Lpc2000

Hi, Peter. Have you verified your P0.14 is low during reset? It is 
required to automatically enter ISP if the ROM checksum is good 
(i.e., the ROM is not blank).

Guille

--- In lpc2000@yahoogroups.com, Peter Homann <groups@h...> wrote:
>
> Hi,
> 
> Thanks for the offer. I'd be interested in learning how to 
implement 
> Modbus on the LPC. Anything you can send will be a big help as I'm 
new 
> to the Arm processor.
> 
> Now my LPC2138 processor has locked up and not talking to the 
Philips 
> flash utility. Hopefully I can get it working again.
> 
> Cheers,
> 
> Peter.
> 
> 
> 
> radim100 wrote:
> > --- In lpc2000@yahoogroups.com, Peter Homann <groups@h...> wrote:
> > 
> >>Hi,
> >>
> >>I am migrating a serial communications interface (Modbus) to a 
> > 
> > LPC2138 
> > 
> >>processor. The Modbus spec defines that an end of message has 
> > 
> > occurred 
> > 
> >>when a period equal to 3.5 characters has passed since the last 
> >>character has been received.
> >>
> >>The LPC uart can generate an interrupt if the receive buffer has 
> >>characters in it and no character has been received for a period 
of 
> > 
> > 3.5 
> > 
> >>- 4.5 characters.
> >>
> >>I would like to use this feature for detecting the end of a 
received 
> >>message. The problem I have is that if I service an interrupt due 
> > 
> > the 
> > 
> >>the buffer being filled, and it also happens that that last 
> > 
> > character in 
> > 
> >>the buffer was the last character for the received message, the 
> > 
> > receive 
> > 
> >>time-out interrupt will not occur, resulting in the end of 
message 
> > 
> > not 
> > 
> >>being detected.
> >>
> >>Is there a solution, other than using a buffer length of 1 and 
using 
> > 
> > a 
> > 
> >>timer to measure the inter message gap?
> >>
> >>Cheers,
> >>
> >>Peter.
> >>
> >>-- 
> >>------------------------------------------------------------------
> >>Web:   www.homanndesigns.com
> >>email: homann@h...
> >>Phone: +61 421 601 665
> >>www.homanndesigns.com/ModIO.html         - Modbus Interface Unit
> >>www.homanndesigns.com/DigiSpeedDeal.html - DC Spindle control
> >>www.homanndesigns.com/TurboTaig.html     - Taig Mill Upgrade board
> >>
> > 
> > If you are interested in MODBUS slave for LPC213X email me 
> > and I can send you some code fot it 
> > Radim design@m...
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> >  
> > Yahoo! Groups Links
> > 
> > 
> > 
> >  
> > 
> > 
> > 
> > 
> > 
> 
> -- 
> ------------------------------------------------------------------
> Web:   www.homanndesigns.com
> email: homann@h...
> Phone: +61 421 601 665
> www.homanndesigns.com/ModIO.html         - Modbus Interface Unit
> www.homanndesigns.com/DigiSpeedDeal.html - DC Spindle control
> www.homanndesigns.com/TurboTaig.html     - Taig Mill Upgrade board
>