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Re: [avr-gcc-list] About the EEPROM application problem in AVR
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From: |
Bob Paddock |
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Subject: |
Re: [avr-gcc-list] About the EEPROM application problem in AVR |
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Date: |
Fri, 3 Jun 2005 19:43:53 -0400 |
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User-agent: |
KMail/1.7.2 |
On Thursday 02 June 2005 09:32 pm, laser lei wrote:
> I used the ATmega48 EEPROM stored my parameter.
> But I can't read back right data before in my program
For the Mega48 the logic at the end of
<avr/io.h> is flawed because iomx8.h sets E2END to 0xFF.
#if E2END < 0x100 && !defined(__COMPILING_AVR_LIBC__)
# undef EEAR
# if E2END > 0
# define EEAR _SFR_IO8(0x1E)
# endif
# undef EEARH
#endif
In your code you need to #undef EEAR and define it per the Mega48 Data Sheet,
after including <avr/io.h> but before you use it.
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