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1 /* Communicates with SPC the way the SNES would.
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2
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3 Note: You'll need an "spc_rom.h" file that contains the 64-byte IPL ROM contents */
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4
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5 #include "snes_spc/spc.h"
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6
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7 #include "demo_util.h"
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8 #include <string.h>
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9 #include <stdio.h>
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10
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11 static SNES_SPC* snes_spc;
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12
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13 /* Make port access more convenient. Fakes time by simply incrementing it each call. */
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14 static spc_time_t stime;
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15 static int pread ( int port ) { return spc_read_port( snes_spc, stime++, port ); }
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16 static void pwrite( int port, int data ) { spc_write_port( snes_spc, stime++, port, data ); }
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17
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18 static unsigned char const spc_rom [spc_rom_size] = {
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19 /* ROM data not provided with emulator */
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20 #include "spc_rom.h"
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21 };
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22
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23 int main()
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24 {
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25 int i;
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26
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27 /* Data to upload */
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28 static unsigned char const data [4] = "\xFA\xDE\xD1";
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29 unsigned const data_addr = 0xF5; /* second I/O port */
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30
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31 snes_spc = spc_new();
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32 if ( !snes_spc ) error( "Out of memory" );
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33 spc_init_rom( snes_spc, spc_rom );
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34 spc_reset( snes_spc );
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35
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36 /* Simulate reads and writes that SNES code would do */
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37
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38 /* Wait for SPC to be ready */
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39 while ( pread( 0 ) != 0xAA || pread( 1 ) != 0xBB ) { }
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40
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41 /* Start address */
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42 pwrite( 2, data_addr & 0xFF );
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43 pwrite( 3, data_addr >> 8 );
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44
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45 /* Tell SPC to start transfer and wait for acknowledgement */
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46 pwrite( 0, 0xCC );
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47 pwrite( 1, 0x01 );
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48 while ( pread( 0 ) != 0xCC ) { }
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49
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50 /* Send each byte and wait for acknowledgement */
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51 for ( i = 0; i < 4; i++ )
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52 {
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53 printf( "%02X ", data [i] );
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54 pwrite( 1, data [i] );
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55 pwrite( 0, i );
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56 while ( pread( 0 ) != i ) { }
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57 }
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58 printf( "\n" );
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59
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60 /* Verify that data was transferred properly */
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61 for ( i = 0; i < 3; i++ )
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62 printf( "%02X ", pread( i + 1 ) );
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63 printf( "\n" );
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64
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65 printf( "Cycles: %ld\n", (long) stime );
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66
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67 spc_delete( snes_spc );
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68
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69 return 0;
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70 }
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