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[avr-libc-dev] [bug #31613] In pgm_read_byte the address is a byte inste


From: Joerg Wunsch
Subject: [avr-libc-dev] [bug #31613] In pgm_read_byte the address is a byte instead of an int
Date: Wed, 10 Nov 2010 16:07:22 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.9.0.19) Gecko/2010071610 Firefox/3.0.19

Follow-up Comment #3, bug #31613 (project avr-libc):

> but I cannot see an error in the attached example.

The error is:

   unsigned int *ptab;

Make this:

   unsigned char *ptab;

and it will work as expected.  The pointer *points* to a
"char" object, yet the pointer itself (i.e., the temporary
variable "ptab") is 16 bits wide anyway.

Despite, useless use of a pointer variable.

   j = pgm_read_byte(testtab + yy);

would work without problems, as would

   j = pgm_read_byte(&testtab[yy]);

Please, use the avr-gcc-list for that kind of questions.

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  <http://savannah.nongnu.org/bugs/?31613>

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