Re: [avr-gcc-list] Const array in bootloader section

[Reza Naima]

somewhat delayed, but check out http://www.reza.net/avr/ -- i've already
gotten a uart based bootloader written -- and it supports a simple
checksum as well.

-r

On Fri, Sep 26, 2003 at 12:47:14PM +0200, Marek Michalkiewicz sent me this...
> On Fri, Sep 26, 2003 at 10:50:12AM +0200, Marko Panger AGB Lab wrote:
> > I am implementing a bootloader which will receive data over a standard UART.
> > Because the board will be mounted in a very noisy environment I would like
> > to compute a CRC over the received data. The CRC is computed by using a CRC
> > table.
> 
> Not exactly the answer to your question (how to put the CRC table
> in the bootloader), but see <avr/crc16.h> for an efficient CRC-16
> implementation.  See http://pdfserv.maxim-ic.com/en/an/app27.pdf
> (pages 14-16) for some background how it works.
> 
> No big tables, and no slow one-bit-at-a-time loops, just 23 words
> and cycles - should be fine for use in a bootloader.  This CRC is
> compatible with the MODBUS RTU (http://www.modbus.org/) protocol.
> 
> Hope this helps,
> Marek
> 
> _______________________________________________
> avr-gcc-list mailing list
> address@hidden
> http://www.avr1.org/mailman/listinfo/avr-gcc-list