mirror of https://github.com/ZDoom/gzdoom.git
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/* Communicates with SPC the way the SNES would.
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Note: You'll need an "spc_rom.h" file that contains the 64-byte IPL ROM contents */
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#include "snes_spc/spc.h"
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#include "demo_util.h"
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#include <string.h>
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#include <stdio.h>
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static SNES_SPC* snes_spc;
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/* Make port access more convenient. Fakes time by simply incrementing it each call. */
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static spc_time_t stime;
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static int pread ( int port ) { return spc_read_port( snes_spc, stime++, port ); }
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static void pwrite( int port, int data ) { spc_write_port( snes_spc, stime++, port, data ); }
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static unsigned char const spc_rom [spc_rom_size] = {
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/* ROM data not provided with emulator */
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#include "spc_rom.h"
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};
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int main()
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{
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int i;
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/* Data to upload */
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static unsigned char const data [4] = "\xFA\xDE\xD1";
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unsigned const data_addr = 0xF5; /* second I/O port */
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snes_spc = spc_new();
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if ( !snes_spc ) error( "Out of memory" );
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spc_init_rom( snes_spc, spc_rom );
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spc_reset( snes_spc );
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/* Simulate reads and writes that SNES code would do */
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/* Wait for SPC to be ready */
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while ( pread( 0 ) != 0xAA || pread( 1 ) != 0xBB ) { }
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/* Start address */
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pwrite( 2, data_addr & 0xFF );
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pwrite( 3, data_addr >> 8 );
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/* Tell SPC to start transfer and wait for acknowledgement */
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pwrite( 0, 0xCC );
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pwrite( 1, 0x01 );
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while ( pread( 0 ) != 0xCC ) { }
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/* Send each byte and wait for acknowledgement */
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for ( i = 0; i < 4; i++ )
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{
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printf( "%02X ", data [i] );
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pwrite( 1, data [i] );
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pwrite( 0, i );
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while ( pread( 0 ) != i ) { }
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}
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printf( "\n" );
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/* Verify that data was transferred properly */
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for ( i = 0; i < 3; i++ )
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printf( "%02X ", pread( i + 1 ) );
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printf( "\n" );
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printf( "Cycles: %ld\n", (long) stime );
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spc_delete( snes_spc );
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return 0;
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}
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