source: soft/tp16/correction/main_dma.c @ 41

#include "stdio.h"

#define NBLOCS 32
#define THRESHOLD 200

int main()
{
        char            buf_in[128*128];
        char            buf_out[128*128];
        int             x;
        int             i;
        int             base = 0;

        while(base < 5*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 */
        x = ioc_read(base, buf_in, NBLOCS);
        if(x)   {
                tty_printf("echec ioc_read = %d\n", x);
                }
        else    
                {
                ioc_completed();
                tty_printf("ioc_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 */
        x = fb_write(0,buf_out,128*128); 
        if(x)   {
                tty_printf("echec fb_write = %d\n", x);
                }
        else    {
                fb_completed();
                tty_printf("transfer completed at date = %d \n",proctime());
                }

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

} // end main