Lpc2000

Hi Guillermo,

THanks for the reply.  As P0.14 is connected to the serial port, I am 
assuming it is controlled by the Philips utility. I will verify that, 
but also control it manually.

Is it possible to erase the bootloader? Also, is the bootloader serial 
protocol documented somewhere?

Cheers,

Peter.

Guillermo Prandi wrote:
> Peter, whether or not the Philips utility turns P0.14 low is entirely 
> dependent of your hardware connections!
> 
> In LPC2138, P0.14 is pin 41. For the LPC2138 to talk to the Philips 
> utility, one of three things must happen:
> 
> 1) You boot with a blank or invalid ROM.
> 2) You boot with P0.14 low (less than 0.8 volts on pin 41 during 
> boot).
> 3) You intentionally call the Phillips boot loader from your LPC code.
> 
> In order to turn pin P0.14 low, you must get to know what is that pin 
> connected to. For example, in the New Micros' Tini213/38 controller 
> interface board, there's a jumper (J11) to set P0.14 to low/high. If 
> you have the Tini2138 module alone, then it's pin 19 of the module 
> that must be connected to GND. I know nothing about other development 
> kits (or your hardware), but there's normally some mechanism allowing 
> this kind of set up. I'm not aware of the RS-232 signal management of 
> the Philips utility, but anyway in order to produce any effect on the 
> P0.14 pin of the chip from the utility, some RS-232 signal (most 
> likely RTS or DTR) must be connected through proper interfacing to 
> pin P0.14 of the LPC.
> 
> Guille
> 
> --- In lpc2000@yahoogroups.com, Peter Homann <groups@h...> wrote:
> 
>>Hi Guille,
>>
>> From the schematic, P014 should by pulled low by the Philips 
> 
> utility 
> 
>>via pin 7 of com port 0?
>>
>>Cheers,
>>
>>Peter.
>>
>>Guillermo Prandi wrote:
>>
>>>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
>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> 
>>>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
>>
> 
> 
> 
> 
> 
> 
> 
> 
>  
> 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