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Re: [avr-gcc-list] External EEPROM verses internal EEPROM data handling

From: Daniel O'Connor
Subject: Re: [avr-gcc-list] External EEPROM verses internal EEPROM data handling
Date: Mon, 4 May 2009 22:21:50 +0930
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On Mon, 4 May 2009, Bob Paddock wrote:
> >                uint16_t voltage[24];   // adc counts of 24 channels
> > in an array } ED;           // total data = 58 bytes
> Because of issues of structure packing it is better to define
> structure items from
> the largest to the smallest, ie. uint16_t should be first.  This is
> more important
> on 32bit processors and up than on the 8bit AVRs.

You could just mark the struct as packed, eg..
typedef struct eventdata {
} __attribute__ ((packed)) ED;

Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
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