#include #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(). */ set_dac_vol(0x00); 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"); uint8_t pageno = 0; if(fpga_status_now & 0x2000) { msu_addr = 0x0; msu_page1_start = msu_page2_start + msu_page_size; pageno = 1; } else { msu_addr = 0x2000; msu_page2_start = msu_page1_start + msu_page_size; pageno = 2; } 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 */