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

From: Reza Naima
Subject: Re: [avr-gcc-list] Const array in bootloader section
Date: Wed, 8 Oct 2003 04:00:00 -0700
User-agent: Mutt/1.5.4i

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.


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
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