Lpc2000

Hello,

Does anyone know if it is possible to modify the philips bootloader
code for the LPC chips to allow the bootloader to work in a half
duplex RS485 mode?

I am building a board who's primary form of communication will be a
2Wire half duplex RS485 link. To upload new firware at the PC end I
can easily use an RS232 to RS485 converter that has automatic gating.
I.e. it will switch between transmit and receive modes automatically.
the problem is the ARM end.

What I want to do on the ARM is to have one of its port lines control
the transmit receive state of the RS485 chip. This would require a
fairly simple mod to the bootloader code, if I had the source.
Does anyone have any suggestions? or alternative bootloader ideas.

On another tack, does anyone have any ideas about bootloader code for
the LPC214x that can use the USB port. This would be a nice option to
use in our product, use a usb port for firmware upgrading. This sort
of functionality is built into the Atmel SAM7 ARM chips

Thanks

Martin Honeywill