source: soft/tp18/correction/main3.c @ 31

#include "stdio.h"

///////////
int main3()
{

#define NBLOCS 32
#define THRESHOLD 200

        char            buf_in[128*128];
        char            buf_out[128*128];
        int             i;
        int             base = 0;

        while(base < 20*NBLOCS) {

        tty_printf("\n *** image %d *** at date = %d \n", base/NBLOCS, proctime());

/* Phase 1 : lecture image sur le disque et transfert vers buf_in */
        if( ioc_read(base, buf_in, NBLOCS) )
        {
                tty_printf("echec io_read\n");
                exit();
        }
        else    
        {
                ioc_completed();
                tty_printf("io_read  completed at date = %d \n",proctime());
        }

/* Phase 2 : transfert de buf_in vers buf_out avec seuillage */
        for(i=0 ; i<128*128 ; i++) {
                if( buf_in[i] > THRESHOLD )     buf_out[i] = 255;
                else                            buf_out[i] = buf_in[i];
        } 
        tty_printf("image processing completed at date = %d \n",proctime());

/* Phase 3 : transfert de buf_out vers le frame buffer par dma */
        if( fb_sync_write(0,buf_out,128*128) ) 
        {
                tty_printf("echec fb_write\n");
                exit();
        }
        else    
        {
                tty_printf("display completed at date = %d \n",proctime());
        }

        base = base + NBLOCS;
        } // end while
        exit();
        return 0;

} // end main3