Lpc2000

Thanks Richard

This solution sounds ok and it seems better than use
ISP commands. 
How did you solve the problem with reallocation
of exception vectors?

Thanks again,

Srdan



--- In lpc2000@yahoogroups.com, Richard Duits <yahoo@...> wrote:
>
> I implemented a second stage bootloader in the first flash sector that 
> is able to update the flash via a FTDI FT245 usb link. The bootloader 
> checks a signature (a CRC is also possible) and if this is correct, it 
> starts the program from the second flash sector. The program can
jump to 
> a fixed address (immediately after the exception vectors) to erase the 
> program and start an update procedure.
> 
> If the update fails, my own bootloader in the first sector will not 
> start the program in the second sector because of an incorrect
signature 
> or crc and it will run in update mode until a correct program is
uploaded.
> 
> A disadvantage is that you need to relocate the exception vectors to
ram 
> or use the fixed exception vector table from the bootloader. Another 
> disadvantage is (at least with the keil ide) is that the debugger /
jtag 
> flash programmer does not know how to handle a program that does not
use 
> sector 0 which I solved by always including the bootloader code in the 
> ide project.
> 
> Regards,
> Richard.
> 
> 
> Srdan Suka wrote:
> > Hi everyone!
> >
> > I am using LPC2103 in my project. LPC is connected to server using
> > RS485 interface (Semi-duplex). Also I have EEPROM memory connected to
> > LPC.
> > I would like to do this if it is possible:
> >
> > 1. Using my resident LPC firmware, load new firmware to EEPROM memory.
> > 2. Load a small program into Flash into first available sector
> >    (this program I would like to use to copy new firmware from
> >     EEPROM to Flash over the existing firmware).
> >
> > Is it possible to use ISP GO command to execute "Copy proggram" from
> > Flash to start copying firmware from EEPROM to flash memory.
> > What will happen it copy process fails and I overwrite firmware at
> > 0x0000 0000 address?
> > Can I "tell" the bootloader alwayws to start the "Copy program"
unless I
> > "tell" it that the updating is finishead and the main firmware should
> > be started?
> >
> > Has anyone tried this?
> >
> > Thanks :)
> >
> > Srdan
> >
> >
>