Mercurial > spc_convert

     1 /* Communicates with SPC the way the SNES would.

     2 

     3 Note: You'll need an "spc_rom.h" file that contains the 64-byte IPL ROM contents */

     4 

     5 #include "snes_spc/spc.h"

     6 

     7 #include "demo_util.h"

     8 #include <string.h>

     9 #include <stdio.h>

    10 

    11 static SNES_SPC* snes_spc;

    12 

    13 /* Make port access more convenient. Fakes time by simply incrementing it each call. */

    14 static spc_time_t stime;

    15 static int  pread ( int port )           { return spc_read_port( snes_spc, stime++, port ); }

    16 static void pwrite( int port, int data ) { spc_write_port( snes_spc, stime++, port, data ); }

    17 

    18 static unsigned char const spc_rom [spc_rom_size] = {

    19 	/* ROM data not provided with emulator */

    20 	#include "spc_rom.h"

    21 };

    22 

    23 int main()

    24 {

    25 	int i;

    26 	

    27 	/* Data to upload */

    28 	static unsigned char const data [4] = "\xFA\xDE\xD1";

    29 	unsigned const data_addr = 0xF5; /* second I/O port */

    30 	

    31 	snes_spc = spc_new();

    32 	if ( !snes_spc ) error( "Out of memory" );

    33 	spc_init_rom( snes_spc, spc_rom );

    34 	spc_reset( snes_spc );

    35 	

    36 	/* Simulate reads and writes that SNES code would do */

    37 	

    38 	/* Wait for SPC to be ready */

    39 	while ( pread( 0 ) != 0xAA || pread( 1 ) != 0xBB ) { }

    40 	

    41 	/* Start address */

    42 	pwrite( 2, data_addr & 0xFF );

    43 	pwrite( 3, data_addr >> 8 );

    44 	

    45 	/* Tell SPC to start transfer and wait for acknowledgement */

    46 	pwrite( 0, 0xCC );

    47 	pwrite( 1, 0x01 );

    48 	while ( pread( 0 ) != 0xCC ) { }

    49 	

    50 	/* Send each byte and wait for acknowledgement */

    51 	for ( i = 0; i < 4; i++ )

    52 	{

    53 		printf( "%02X ", data [i] );

    54 		pwrite( 1, data [i] );

    55 		pwrite( 0, i );

    56 		while ( pread( 0 ) != i ) { }

    57 	}

    58 	printf( "\n" );

    59 	

    60 	/* Verify that data was transferred properly */

    61 	for ( i = 0; i < 3; i++ )

    62 		printf( "%02X ", pread( i + 1 ) );

    63 	printf( "\n" );

    64 	

    65 	printf( "Cycles: %ld\n", (long) stime );

    66 	

    67 	spc_delete( snes_spc );

    68 	

    69 	return 0;

    70 }
author	Robert McIntyre <rlm@mit.edu>
date	Fri, 21 Oct 2011 05:53:11 -0700
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