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- #include <string.h>
- #include "config.h"
- #include "uart.h"
- #include "ff.h"
- #include "diskio.h"
- #include "spi.h"
- #include "fpga_spi.h"
- #include "cli.h"
- #include "fileops.h"
- #include "msu1.h"
- #include "snes.h"
- #include "timer.h"
- #include "smc.h"
- FIL msufile;
- FRESULT msu_res;
- DWORD msu_cltbl[CLTBL_SIZE] IN_AHBRAM;
- DWORD pcm_cltbl[CLTBL_SIZE] IN_AHBRAM;
- UINT msu_audio_bytes_read = 1024;
- UINT msu_data_bytes_read = 1;
- extern snes_romprops_t romprops;
- uint32_t msu_loop_point = 0;
- uint32_t msu_page1_start = 0x0000;
- uint32_t msu_page2_start = 0x2000;
- uint32_t msu_page_size = 0x2000;
- uint16_t fpga_status_prev;
- uint16_t fpga_status_now;
- enum msu_reset_state { MSU_RESET_NONE = 0, MSU_RESET_SHORT, MSU_RESET_LONG };
- void prepare_audio_track( uint16_t msu_track )
- {
- /* open file, fill buffer */
- char suffix[11];
- f_close( &file_handle );
- snprintf( suffix, sizeof( suffix ), "-%d.pcm", msu_track );
- strcpy( ( char * )file_buf, ( char * )file_lfn );
- strcpy( strrchr( ( char * )file_buf, ( int )'.' ), suffix );
- DBG_MSU1 printf( "filename: %s\n", file_buf );
- if ( f_open( &file_handle, ( const TCHAR * )file_buf, FA_READ ) == FR_OK )
- {
- file_handle.cltbl = pcm_cltbl;
- pcm_cltbl[0] = CLTBL_SIZE;
- f_lseek( &file_handle, CREATE_LINKMAP );
- f_lseek( &file_handle, 4L );
- f_read( &file_handle, &msu_loop_point, 4, &msu_audio_bytes_read );
- DBG_MSU1 printf( "loop point: %ld samples\n", msu_loop_point );
- ff_sd_offload = 1;
- sd_offload_tgt = 1;
- f_lseek( &file_handle, 8L );
- set_dac_addr( 0 );
- dac_pause();
- dac_reset();
- ff_sd_offload = 1;
- sd_offload_tgt = 1;
- f_read( &file_handle, file_buf, MSU_DAC_BUFSIZE, &msu_audio_bytes_read );
- /* clear busy bit */
- set_msu_status( 0x00, 0x28 ); /* set no bits, reset audio_busy + audio_error */
- }
- else
- {
- f_close( &file_handle );
- set_msu_status( 0x08, 0x20 ); /* reset audio_busy, set audio_error */
- }
- }
- void prepare_data( uint32_t msu_offset )
- {
- DBG_MSU1 printf( "Data requested! Offset=%08lx page1=%08lx page2=%08lx\n", msu_offset, msu_page1_start,
- msu_page2_start );
- if ( ( ( msu_offset < msu_page1_start )
- || ( msu_offset >= msu_page1_start + msu_page_size ) )
- && ( ( msu_offset < msu_page2_start )
- || ( msu_offset >= msu_page2_start + msu_page_size ) ) )
- {
- DBG_MSU1 printf( "offset %08lx out of range (%08lx-%08lx, %08lx-%08lx), reload\n", msu_offset, msu_page1_start,
- msu_page1_start + msu_page_size - 1, msu_page2_start, msu_page2_start + msu_page_size - 1 );
- /* "cache miss" */
- /* fill buffer */
- set_msu_addr( 0x0 );
- sd_offload_tgt = 2;
- ff_sd_offload = 1;
- msu_res = f_lseek( &msufile, msu_offset );
- DBG_MSU1 printf( "seek to %08lx, res = %d\n", msu_offset, msu_res );
- sd_offload_tgt = 2;
- ff_sd_offload = 1;
- msu_res = f_read( &msufile, file_buf, 16384, &msu_data_bytes_read );
- DBG_MSU1 printf( "read res = %d\n", msu_res );
- DBG_MSU1 printf( "read %d bytes\n", msu_data_bytes_read );
- msu_reset( 0x0 );
- msu_page1_start = msu_offset;
- msu_page2_start = msu_offset + msu_page_size;
- }
- else
- {
- if ( msu_offset >= msu_page1_start && msu_offset <= msu_page1_start + msu_page_size )
- {
- msu_reset( 0x0000 + msu_offset - msu_page1_start );
- DBG_MSU1 printf( "inside page1, new offset: %08lx\n", 0x0000 + msu_offset - msu_page1_start );
- if ( !( msu_page2_start == msu_page1_start + msu_page_size ) )
- {
- set_msu_addr( 0x2000 );
- sd_offload_tgt = 2;
- ff_sd_offload = 1;
- f_read( &msufile, file_buf, 8192, &msu_data_bytes_read );
- DBG_MSU1 printf( "next page dirty (was: %08lx), loaded page2 (start now: ", msu_page2_start );
- msu_page2_start = msu_page1_start + msu_page_size;
- DBG_MSU1 printf( "%08lx)\n", msu_page2_start );
- }
- }
- else if ( msu_offset >= msu_page2_start && msu_offset <= msu_page2_start + msu_page_size )
- {
- DBG_MSU1 printf( "inside page2, new offset: %08lx\n", 0x2000 + msu_offset - msu_page2_start );
- msu_reset( 0x2000 + msu_offset - msu_page2_start );
- if ( !( msu_page1_start == msu_page2_start + msu_page_size ) )
- {
- set_msu_addr( 0x0 );
- sd_offload_tgt = 2;
- ff_sd_offload = 1;
- f_read( &msufile, file_buf, 8192, &msu_data_bytes_read );
- DBG_MSU1 printf( "next page dirty (was: %08lx), loaded page1 (start now: ", msu_page1_start );
- msu_page1_start = msu_page2_start + msu_page_size;
- DBG_MSU1 printf( "%08lx)\n", msu_page1_start );
- }
- }
- else
- {
- printf( "!!!WATWATWAT!!!\n" );
- }
- }
- /* clear bank bit to mask bank reset artifact */
- fpga_status_now &= ~0x2000;
- fpga_status_prev &= ~0x2000;
- /* clear busy bit */
- set_msu_status( 0x00, 0x10 );
- }
- int msu1_check_reset( void )
- {
- static tick_t rising_ticks;
- static uint8_t resbutton = 0, resbutton_prev = 0;
- int result = MSU_RESET_NONE;
- resbutton = get_snes_reset();
- if ( resbutton && !resbutton_prev ) /* push */
- {
- rising_ticks = getticks();
- }
- else if ( resbutton && resbutton_prev ) /* hold */
- {
- if ( getticks() > rising_ticks + 99 )
- {
- result = MSU_RESET_LONG;
- }
- }
- else if ( !resbutton && resbutton_prev ) /* release */
- {
- if ( getticks() < rising_ticks + 99 )
- {
- result = MSU_RESET_SHORT;
- }
- }
- else
- {
- result = MSU_RESET_NONE;
- }
- resbutton_prev = resbutton;
- return result;
- }
- int msu1_check( uint8_t *filename )
- {
- /* open MSU file */
- strcpy( ( char * )file_buf, ( char * )filename );
- strcpy( strrchr( ( char * )file_buf, ( int )'.' ), ".msu" );
- printf( "MSU datafile: %s\n", file_buf );
- if ( f_open( &msufile, ( const TCHAR * )file_buf, FA_READ ) != FR_OK )
- {
- printf( "MSU datafile not found\n" );
- return 0;
- }
- msufile.cltbl = msu_cltbl;
- msu_cltbl[0] = CLTBL_SIZE;
- if ( f_lseek( &msufile, CREATE_LINKMAP ) )
- {
- printf( "Error creating FF linkmap for MSU file!\n" );
- }
- romprops.fpga_features |= FEAT_MSU1;
- return 1;
- }
- int msu1_loop()
- {
- /* it is assumed that the MSU file is already opened by calling msu1_check(). */
- while ( fpga_status() & 0x4000 );
- uint16_t dac_addr = 0;
- uint16_t msu_addr = 0;
- uint8_t msu_repeat = 0;
- uint16_t msu_track = 0;
- uint32_t msu_offset = 0;
- fpga_status_prev = fpga_status();
- fpga_status_now = fpga_status();
- int msu_res;
- /* set_msu_addr(0x0);
- msu_reset(0x0);
- ff_sd_offload=1;
- sd_offload_tgt=2;
- f_lseek(&msufile, 0L);
- ff_sd_offload=1;
- sd_offload_tgt=2;
- f_read(&msufile, file_buf, 16384, &msu_data_bytes_read);
- */
- set_dac_addr( dac_addr );
- dac_pause();
- dac_reset();
- set_msu_addr( 0x0 );
- msu_reset( 0x0 );
- ff_sd_offload = 1;
- sd_offload_tgt = 2;
- f_lseek( &msufile, 0L );
- ff_sd_offload = 1;
- sd_offload_tgt = 2;
- f_read( &msufile, file_buf, 16384, &msu_data_bytes_read );
- prepare_audio_track( 0 );
- prepare_data( 0 );
- /* audio_start, data_start, 0, audio_ctrl[1:0], ctrl_start */
- while ( ( msu_res = msu1_check_reset() ) == MSU_RESET_NONE )
- {
- cli_entrycheck();
- fpga_status_now = fpga_status();
- /* Data buffer refill */
- if ( ( fpga_status_now & 0x2000 ) != ( fpga_status_prev & 0x2000 ) )
- {
- DBG_MSU1 printf( "data\n" );
- if ( fpga_status_now & 0x2000 )
- {
- msu_addr = 0x0;
- msu_page1_start = msu_page2_start + msu_page_size;
- }
- else
- {
- msu_addr = 0x2000;
- msu_page2_start = msu_page1_start + msu_page_size;
- }
- set_msu_addr( msu_addr );
- sd_offload_tgt = 2;
- ff_sd_offload = 1;
- msu_res = f_read( &msufile, file_buf, 8192, &msu_data_bytes_read );
- DBG_MSU1 printf( "data buffer refilled. res=%d page1=%08lx page2=%08lx\n", msu_res, msu_page1_start, msu_page2_start );
- }
- /* Audio buffer refill */
- if ( ( fpga_status_now & 0x4000 ) != ( fpga_status_prev & 0x4000 ) )
- {
- if ( fpga_status_now & 0x4000 )
- {
- dac_addr = 0;
- }
- else
- {
- dac_addr = MSU_DAC_BUFSIZE / 2;
- }
- set_dac_addr( dac_addr );
- sd_offload_tgt = 1;
- ff_sd_offload = 1;
- f_read( &file_handle, file_buf, MSU_DAC_BUFSIZE / 2, &msu_audio_bytes_read );
- }
- if ( fpga_status_now & 0x0020 )
- {
- /* get trackno */
- msu_track = get_msu_track();
- DBG_MSU1 printf( "Audio requested! Track=%d\n", msu_track );
- prepare_audio_track( msu_track );
- }
- if ( fpga_status_now & 0x0010 )
- {
- /* get address */
- msu_offset = get_msu_offset();
- prepare_data( msu_offset );
- }
- if ( fpga_status_now & 0x0001 )
- {
- if ( fpga_status_now & 0x0004 )
- {
- msu_repeat = 1;
- set_msu_status( 0x04, 0x01 ); /* set bit 2, reset bit 0 */
- DBG_MSU1 printf( "Repeat set!\n" );
- }
- else
- {
- msu_repeat = 0;
- set_msu_status( 0x00, 0x05 ); /* set no bits, reset bit 0+2 */
- DBG_MSU1 printf( "Repeat clear!\n" );
- }
- if ( fpga_status_now & 0x0002 )
- {
- DBG_MSU1 printf( "PLAY!\n" );
- set_msu_status( 0x02, 0x01 ); /* set bit 0, reset bit 1 */
- dac_play();
- }
- else
- {
- DBG_MSU1 printf( "PAUSE!\n" );
- set_msu_status( 0x00, 0x03 ); /* set no bits, reset bit 1+0 */
- dac_pause();
- }
- }
- fpga_status_prev = fpga_status_now;
- /* handle loop / end */
- if ( msu_audio_bytes_read < MSU_DAC_BUFSIZE / 2 )
- {
- ff_sd_offload = 0;
- sd_offload = 0;
- if ( msu_repeat )
- {
- DBG_MSU1 printf( "loop\n" );
- ff_sd_offload = 1;
- sd_offload_tgt = 1;
- f_lseek( &file_handle, 8L + msu_loop_point * 4 );
- ff_sd_offload = 1;
- sd_offload_tgt = 1;
- f_read( &file_handle, file_buf, ( MSU_DAC_BUFSIZE / 2 ) - msu_audio_bytes_read, &msu_audio_bytes_read );
- }
- else
- {
- set_msu_status( 0x00, 0x02 ); /* clear play bit */
- dac_pause();
- }
- msu_audio_bytes_read = MSU_DAC_BUFSIZE;
- }
- }
- f_close( &file_handle );
- DBG_MSU1 printf( "Reset " );
- if ( msu_res == MSU_RESET_LONG )
- {
- f_close( &msufile );
- DBG_MSU1 printf( "to menu\n" );
- return 1;
- }
- DBG_MSU1 printf( "game\n" );
- return 0;
- }
- /* END OF MSU1 STUFF */
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