Lpc2000

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@...
> 
> 
> 
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
> 
> 

-- 
------------------------------------------------------------------
Web:   www.homanndesigns.com
email: homann@...
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