Lpc2000

Ok, then if you need to write a bootloader it is a different thing.
1. Start studing the possibility to use LPC way to program the flash 
with ISP bootloader and/or using JTAG
2. If the previous approach doesn't work for you, you have basically to 
store in flash your bootloader (but it is compiled to work residing in ram)
and then when you need to program the flash:
- copy bootloader code in ram
- start executing code from ram
- use some space in ram to collect data to program on flash (a block 
multiple i.e. 2KB)
- program flash coping data from ram to flash
- provide a communication protocol with some arbitration because write 
to flash takes some time
- provide the communication protocol with a command to reset the LPC
- provide a timeout in bootloader code to automatically reset the LPC if 
no data received for more then x milliseconds.
I wrote some bootloaders for various microcontrollers to use different 
interfaces to program microcontrollers or flash chips working in this 
way and they perform very well. May be that you also require some sort 
of ram backup and some sort of security if the programming procedure 
stops before the end (i.e. power failure). Due t the big ram space on 
LPC microcontrollers may be not so difficult to obtain these goals. 
Remember that ARM7 is a RISC microcontroller with no different address 
space for data and code, so you have only to write a relocatable program.
Best regards,
Massimo Manca, Micron Engineering

gilles_baracoda wrote:

> Actually what I would like to do is upgrade the code of the MCU...so
> I have no choice but writing the internal flash!
>
> Thanks for the reply anyway.
> Regards,
>
> Gilles
>
> --- In lpc2000@yahoogroups.com, Micron Engineering <micronpn@t...>
> wrote:
> > I think that if you haven't a lot of data to write it is more
> simple and
> > time efficient to use a simple I2C  eeprom or  an SPI eeprom
> external
> > connected to the LPC. Flash programming generally is used to write
> > calibration data and so on during production or calibration not
> many times.
>
>
>
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