Re: [avr-gcc-list] Program Space String Utility - winavr20030312

[E. Weddington]

On 10 Apr 2003 at 11:45, Loc Mai wrote:

> Why  does sizeof(leds) work, but not strlen(leds) in for loop
> 1.  for (l=0; l<sizeof(leds); l++) {    //works fine
> 
> 2.  // for (l=0; l< strlen_P(leds); l++) { does not work properly,
> never get 0xFF from array.
> 
> Anyone knows where I can get examples how I can use Program Space
> String Utility - winavr20030312. In the AVR-libc reference does not
> show how the can be applied.  It is not easy to understand for newbie
> like me. Cheers.
> 
> Here is program:
> #include <inttypes.h> //-------
> #include <avr/io.h>
> #include <avr/pgmspace.h>
> 
> static uint8_t PROGMEM array[]={0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0,
> 0x80, 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
> 
> int main(void)
> {
>    uint8_t i, j, k, l, n=0;
> //   uint8_t i, j, k, l;
> 
>     outp(0xff,DDRB);                /* use all pins on PortB for
>     output */
>    for (;;) {
>         for (l=0; l<sizeof(leds); l++) {    //works fine
> //        for (l=0; l< strlen_P(leds); l++) {
>             outp(PRG_RDB(&leds[l]), PORTB);
> 
> //delay ....cut here ................
> //..........................................
>        }
>     }
> }


Where is leds declared? What is leds?

Eric