///////////////////////////////////////////////////////////////////////////////
//  file   : main.c  (for display application)
//  date   : may 2014
//  author : Alain Greiner
///////////////////////////////////////////////////////////////////////////////////////
//  This file describes the single thread "display" application.
//  It uses the external chained buffer DMA to display a stream
//  of images on the frame buffer.  
///////////////////////////////////////////////////////////////////////////////////////

#include <stdio.h>
#include <hard_config.h>

#define FILENAME    "misc/images.raw"
#define NPIXELS     128
#define NLINES      128
#define NIMAGES     10                    
#define NBLOCKS     (NPIXELS*NLINES/512)   // number of blocks per image


unsigned char buf0[NPIXELS*NLINES] __attribute__((aligned(512)));
unsigned char buf1[NPIXELS*NLINES] __attribute__((aligned(512)));

////////////////////////////////////////////
__attribute__((constructor)) void main()
////////////////////////////////////////////
{
    // get processor identifiers
    unsigned int    x;
    unsigned int    y; 
    unsigned int    lpid;
    giet_proc_xyp( &x, &y, &lpid );

    int             fd;
    unsigned int    image = 0;

    // parameters checking
    if ( (NPIXELS != FBUF_X_SIZE) || (NLINES != FBUF_Y_SIZE) )
    {
        giet_exit("[DISPLAY ERROR] Frame buffer size does not fit image size");
    }

    giet_shr_printf("\n[DISPLAY] Processor[%d,%d,%d] starts at cycle %d\n",
                    x, y, lpid, giet_proctime() );

    // open file
    fd = giet_fat_open( FILENAME , 0 );
    if ( fd < 0 ) 
    {
        giet_exit("echec giet_fat_open for misc/images.raw");
    }
    else
    {
        giet_shr_printf("\n[DISPLAY] Proc[%d,%d,%d] open file %s at cycle %d\n", 
                    x, y, lpid, FILENAME, giet_proctime() );
    }

    // get a Chained Buffer DMA channel
    giet_fbf_cma_alloc();

    // start Chained Buffer DMA channel
    giet_fbf_cma_start( buf0, buf1, NPIXELS*NLINES );
    
    giet_shr_printf("\n[DISPLAY] Proc[%d,%d,%d] starts CMA at cycle %d\n", 
                    x, y, lpid, giet_proctime() );

    // Main loop (on images)
    while ( image < NIMAGES )
    {
        giet_fat_read( fd, buf0, NBLOCKS, image*NBLOCKS );

        giet_shr_printf("\n[DISPLAY] Proc[%d,%d,%d] load image %d to buf0 at cycle %d\n", 
                        x, y, lpid, image, giet_proctime() );

        giet_fbf_cma_display( 0 );

        giet_shr_printf("\n[DISPLAY] Proc[%d,%d,%d] display image %d from buf0 at cycle %d\n", 
                        x, y, lpid, image, giet_proctime() );

        image++;

        giet_fat_read( fd, buf1, NBLOCKS, image*NBLOCKS );

        giet_shr_printf("\n[DISPLAY] Proc[%d,%d,%d] load image %d to buf1 at cycle %d\n", 
                        x, y, lpid, image, giet_proctime() );

        giet_fbf_cma_display( 1 );

        giet_shr_printf("\n[DISPLAY] Proc[%d,%d,%d] display image %d from buf1 at cycle %d\n", 
                        x, y, lpid, image, giet_proctime() );


        image++;
    }

    // stop Chained buffer DMA channel
    giet_fbf_cma_stop();

    giet_exit("display completed");
}