[En-Nut-Discussion] Led example error

[Lorenzo Verniani]

I edited led example source adding printf("xxxxx")
Compiling by gcc i receive this error:

avr-gcc -c -mmcu=atmega128 -Os -fno-delete-null-pointer-checks -Wall
-Wstrict-prototypes -Wa,-ahlms=led01.lst -DETHERNUT2 -D__HARVARD_ARCH__
-I/home/lorenzo/ethernut-4.0.3-bld/include
-I/home/lorenzo/ethernut-4.0.3/include
led01.c -o led01.o
led01.c: In function `NutAppMain':
led01.c:26: warning: implicit declaration of function `printf'
avr-gcc led01.o -mmcu=atmega128 -Wl,--defsym=main=0,-Map=led01.map,--cref
-L/home/lorenzo/ethernut-4.0.3-bld/lib
/home/lorenzo/ethernut-4.0.3-bld/lib/nutinit.o
-lnutpro -lnutos -lnutarch -lnutdev -lnutnet -lnutfs -lnutcrt -o led01.elf
/home/lorenzo/ethernut-4.0.3-bld/lib/libnutcrt.a(open.o)(.text+0x5a): In
function `_open':
: undefined reference to `NutDeviceLookup'
make: *** [led01.elf] Error 1

the source.c is the following (my edits are evidenced):

/*
 * This header contains the Nut/OS timer function
 * prototypes. We need it for calling NutSleep.
 */
#include <sys/timer.h>
#include <avr/sleep.h>
#include <stdio.h>

/*
 * Ethernut LED example #1.
 */
int main(void)
{
    /*
     * Configure port E bit 2 as an output.
     */
    sbi(DDRE, 2);

    /*
     * An endless loop.
     */
    for (;;) {
        /*
         * Set port E bit 2 to low. This will lit the LED.
         */
        cbi(PORTE, 2);
        printf("led on");
        /*
         * Sleep 1000 milliseconds.
         */
        NutSleep(1200);

        /*
         * Setting port E bit 2 to high switches off the LED.
         */
        sbi(PORTE, 2);

        /*
         * Sleep for another 300 milliseconds.
         */

    NutSleep(300);

    cbi(PORTE, 2);

    NutSleep(500);

    sbi(PORTE, 2);    // corto

    NutSleep(300);

    cbi(PORTE, 2);    /* lungo    */

    NutSleep(1200);

    sbi(PORTE, 2);

    NutSleep(3000);

    }
}



Best regards.

                    Lorenzo Verniani