RE: [avr-gcc-list] why the pointer get a error address?

[Phillip Vogel]

I can't believe I can actually answer this:

First, define you array like this:

const char pattern[]  PROGMEM = {
  1,2,3,a,b,c
};

The data can go on for several lines (mine goes on for a couple of
thousand lines).

Then to access the data, us a function like this:

char readpattern(int i)  // read a byte out of the pattern array in
flash
{
        return (char)pgm_read_byte(pattern);
}

I forget where I found this, probably in the FAQ, but it DOES work.

Phillip Vogel
Bartal Design Group, Inc.
318 Marlboro Road Englewood, NJ 07631-1416
Phone: 201-567-1343   Fax: 201-568-2891
Cell: 201-232-5208
mailto:address@hidden  http://www.VisualConductor.com
Ask me about the Visual Conductor 

> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On Behalf Of whiteman
> Sent: Friday, February 13, 2004 8:28 PM
> To: avr-gcc-list
> Subject: [avr-gcc-list] why the pointer get a error address?
> 
> 
> hi,all！
>    I defined a array in program space and a pointer to this array.
> eg:
> 
> 
> uint8_t test_array[] PROGMEM = {
>       1,2,3,4,5,6,7
> };
> const prog_char *character_pnt;
> 
> void main(void)
> {
>       charcter_pnt = test_array;
>       ;
>       ;
> }
> 
> but when I simulated with avr_studio, I found the
> "character_pnt" get a error address,The "*character_pnt" 
> isn't equal to 1.why?
> 
>       
> Regards                               
> 
> 　　　　　　　　whiteman
> address@hidden
> 　　　　　　　　　　2004-02-14
> 
> 
> 
> 
> _______________________________________________
> avr-gcc-list mailing list
> address@hidden
> http://www.avr1.org/mailman/listinfo/avr-gcc-> list
> 
> 

> -----Original Message-----
> From: address@hidden 
> [mailto:address@hidden On Behalf Of whiteman
> Sent: Friday, February 13, 2004 8:28 PM
> To: avr-gcc-list
> Subject: [avr-gcc-list] why the pointer get a error address?
> 
> 
> hi,all！
>    I defined a array in program space and a pointer to this array.
> eg:
> 
> 
> uint8_t test_array[] PROGMEM = {
>       1,2,3,4,5,6,7
> };
> const prog_char *character_pnt;
> 
> void main(void)
> {
>       charcter_pnt = test_array;
>       ;
>       ;
> }
> 
> but when I simulated with avr_studio, I found the 
> "character_pnt" get a error address,The "*character_pnt" 
> isn't equal to 1.why?
> 
>       
> Regards                               
> 
> 　　　　　　　　whiteman
> address@hidden
> 　　　　　　　　　　2004-02-14
> 
> 
> 
> 
> _______________________________________________
> avr-gcc-list mailing list
> address@hidden 
> http://www.avr1.org/mailman/listinfo/avr-gcc-> list
> 
>