source: soft/giet_vm/apps/display/main.c @ 185

#include <stdio.h>

#define NBLOCS 32
#define THRESHOLD 200

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

    while (base < 5 * NBLOCS)
    {

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

        /* Phase 1 : lecture image sur le disque et transfert vers buf_in */
        x = giet_ioc_read(base, buf_in, NBLOCS);
        if ( x )
        {
            giet_tty_printf("echec giet_ioc_read : %d\n", x);
            giet_exit();
        }
        x = giet_ioc_completed();
        if ( x )
        {
            giet_tty_printf("echec giet_ioc_completed : %d\n", x);
            giet_exit();
        }
        giet_tty_printf("io_read  completed at date = %d \n", giet_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];
        }
        giet_tty_printf("image processing completed at date = %d \n", giet_proctime());

        /* Phase 3 : transfert de buf_out vers le frame buffer par dma */
        x = giet_fb_write(0, buf_out, 128 * 128);
        if ( x )
        {
            giet_tty_printf("echec giet_fb_write : %d\n", x);
            giet_exit();
        }
        x = giet_fb_completed();
        if ( x )
        {
            giet_tty_printf("echec giet_fb_completed : %d\n", x);
            giet_exit();
        }
        giet_tty_printf("transfer completed at date = %d \n", giet_proctime());

        base = base + NBLOCS;
    }

    giet_exit();

    return 0;
}